Chapter 11. Troubleshooting This section describes resources for troubleshooting the Migration Toolkit for Containers (MTC). For known issues, see the MTC release notes . 11.1. MTC workflow You can migrate Kubernetes resources, persistent volume data, and internal container images to OpenShift Container Platform 4.16 by using the Migration Toolkit for Containers (MTC) web console or the Kubernetes API. MTC migrates the following resources: A namespace specified in a migration plan. Namespace-scoped resources: When the MTC migrates a namespace, it migrates all the objects and resources associated with that namespace, such as services or pods. Additionally, if a resource that exists in the namespace but not at the cluster level depends on a resource that exists at the cluster level, the MTC migrates both resources. For example, a security context constraint (SCC) is a resource that exists at the cluster level and a service account (SA) is a resource that exists at the namespace level. If an SA exists in a namespace that the MTC migrates, the MTC automatically locates any SCCs that are linked to the SA and also migrates those SCCs. Similarly, the MTC migrates persistent volumes that are linked to the persistent volume claims of the namespace. Note Cluster-scoped resources might have to be migrated manually, depending on the resource. Custom resources (CRs) and custom resource definitions (CRDs): MTC automatically migrates CRs and CRDs at the namespace level. Migrating an application with the MTC web console involves the following steps: Install the Migration Toolkit for Containers Operator on all clusters. You can install the Migration Toolkit for Containers Operator in a restricted environment with limited or no internet access. The source and target clusters must have network access to each other and to a mirror registry. Configure the replication repository, an intermediate object storage that MTC uses to migrate data. The source and target clusters must have network access to the replication repository during migration. If you are using a proxy server, you must configure it to allow network traffic between the replication repository and the clusters. Add the source cluster to the MTC web console. Add the replication repository to the MTC web console. Create a migration plan, with one of the following data migration options: Copy : MTC copies the data from the source cluster to the replication repository, and from the replication repository to the target cluster. Note If you are using direct image migration or direct volume migration, the images or volumes are copied directly from the source cluster to the target cluster. Move : MTC unmounts a remote volume, for example, NFS, from the source cluster, creates a PV resource on the target cluster pointing to the remote volume, and then mounts the remote volume on the target cluster. Applications running on the target cluster use the same remote volume that the source cluster was using. The remote volume must be accessible to the source and target clusters. Note Although the replication repository does not appear in this diagram, it is required for migration. Run the migration plan, with one of the following options: Stage copies data to the target cluster without stopping the application. A stage migration can be run multiple times so that most of the data is copied to the target before migration. Running one or more stage migrations reduces the duration of the cutover migration. Cutover stops the application on the source cluster and moves the resources to the target cluster. Optional: You can clear the Halt transactions on the source cluster during migration checkbox. About MTC custom resources The Migration Toolkit for Containers (MTC) creates the following custom resources (CRs): MigCluster (configuration, MTC cluster): Cluster definition MigStorage (configuration, MTC cluster): Storage definition MigPlan (configuration, MTC cluster): Migration plan The MigPlan CR describes the source and target clusters, replication repository, and namespaces being migrated. It is associated with 0, 1, or many MigMigration CRs. Note Deleting a MigPlan CR deletes the associated MigMigration CRs. BackupStorageLocation (configuration, MTC cluster): Location of Velero backup objects VolumeSnapshotLocation (configuration, MTC cluster): Location of Velero volume snapshots MigMigration (action, MTC cluster): Migration, created every time you stage or migrate data. Each MigMigration CR is associated with a MigPlan CR. Backup (action, source cluster): When you run a migration plan, the MigMigration CR creates two Velero backup CRs on each source cluster: Backup CR #1 for Kubernetes objects Backup CR #2 for PV data Restore (action, target cluster): When you run a migration plan, the MigMigration CR creates two Velero restore CRs on the target cluster: Restore CR #1 (using Backup CR #2) for PV data Restore CR #2 (using Backup CR #1) for Kubernetes objects 11.2. Migration Toolkit for Containers custom resource manifests Migration Toolkit for Containers (MTC) uses the following custom resource (CR) manifests for migrating applications. 11.2.1. DirectImageMigration The DirectImageMigration CR copies images directly from the source cluster to the destination cluster. apiVersion: migration.openshift.io/v1alpha1 kind: DirectImageMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_image_migration> spec: srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration namespaces: 1 - <source_namespace_1> - <source_namespace_2>:<destination_namespace_3> 2 1 One or more namespaces containing images to be migrated. By default, the destination namespace has the same name as the source namespace. 2 Source namespace mapped to a destination namespace with a different name. 11.2.2. DirectImageStreamMigration The DirectImageStreamMigration CR copies image stream references directly from the source cluster to the destination cluster. apiVersion: migration.openshift.io/v1alpha1 kind: DirectImageStreamMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_image_stream_migration> spec: srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration imageStreamRef: name: <image_stream> namespace: <source_image_stream_namespace> destNamespace: <destination_image_stream_namespace> 11.2.3. DirectVolumeMigration The DirectVolumeMigration CR copies persistent volumes (PVs) directly from the source cluster to the destination cluster. apiVersion: migration.openshift.io/v1alpha1 kind: DirectVolumeMigration metadata: name: <direct_volume_migration> namespace: openshift-migration spec: createDestinationNamespaces: false 1 deleteProgressReportingCRs: false 2 destMigClusterRef: name: <host_cluster> 3 namespace: openshift-migration persistentVolumeClaims: - name: <pvc> 4 namespace: <pvc_namespace> srcMigClusterRef: name: <source_cluster> namespace: openshift-migration 1 Set to true to create namespaces for the PVs on the destination cluster. 2 Set to true to delete DirectVolumeMigrationProgress CRs after migration. The default is false so that DirectVolumeMigrationProgress CRs are retained for troubleshooting. 3 Update the cluster name if the destination cluster is not the host cluster. 4 Specify one or more PVCs to be migrated. 11.2.4. DirectVolumeMigrationProgress The DirectVolumeMigrationProgress CR shows the progress of the DirectVolumeMigration CR. apiVersion: migration.openshift.io/v1alpha1 kind: DirectVolumeMigrationProgress metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_volume_migration_progress> spec: clusterRef: name: <source_cluster> namespace: openshift-migration podRef: name: <rsync_pod> namespace: openshift-migration 11.2.5. MigAnalytic The MigAnalytic CR collects the number of images, Kubernetes resources, and the persistent volume (PV) capacity from an associated MigPlan CR. You can configure the data that it collects. apiVersion: migration.openshift.io/v1alpha1 kind: MigAnalytic metadata: annotations: migplan: <migplan> name: <miganalytic> namespace: openshift-migration labels: migplan: <migplan> spec: analyzeImageCount: true 1 analyzeK8SResources: true 2 analyzePVCapacity: true 3 listImages: false 4 listImagesLimit: 50 5 migPlanRef: name: <migplan> namespace: openshift-migration 1 Optional: Returns the number of images. 2 Optional: Returns the number, kind, and API version of the Kubernetes resources. 3 Optional: Returns the PV capacity. 4 Returns a list of image names. The default is false so that the output is not excessively long. 5 Optional: Specify the maximum number of image names to return if listImages is true . 11.2.6. MigCluster The MigCluster CR defines a host, local, or remote cluster. apiVersion: migration.openshift.io/v1alpha1 kind: MigCluster metadata: labels: controller-tools.k8s.io: "1.0" name: <host_cluster> 1 namespace: openshift-migration spec: isHostCluster: true 2 # The 'azureResourceGroup' parameter is relevant only for Microsoft Azure. azureResourceGroup: <azure_resource_group> 3 caBundle: <ca_bundle_base64> 4 insecure: false 5 refresh: false 6 # The 'restartRestic' parameter is relevant for a source cluster. restartRestic: true 7 # The following parameters are relevant for a remote cluster. exposedRegistryPath: <registry_route> 8 url: <destination_cluster_url> 9 serviceAccountSecretRef: name: <source_secret> 10 namespace: openshift-config 1 Update the cluster name if the migration-controller pod is not running on this cluster. 2 The migration-controller pod runs on this cluster if true . 3 Microsoft Azure only: Specify the resource group. 4 Optional: If you created a certificate bundle for self-signed CA certificates and if the insecure parameter value is false , specify the base64-encoded certificate bundle. 5 Set to true to disable SSL verification. 6 Set to true to validate the cluster. 7 Set to true to restart the Restic pods on the source cluster after the Stage pods are created. 8 Remote cluster and direct image migration only: Specify the exposed secure registry path. 9 Remote cluster only: Specify the URL. 10 Remote cluster only: Specify the name of the Secret object. 11.2.7. MigHook The MigHook CR defines a migration hook that runs custom code at a specified stage of the migration. You can create up to four migration hooks. Each hook runs during a different phase of the migration. You can configure the hook name, runtime duration, a custom image, and the cluster where the hook will run. The migration phases and namespaces of the hooks are configured in the MigPlan CR. apiVersion: migration.openshift.io/v1alpha1 kind: MigHook metadata: generateName: <hook_name_prefix> 1 name: <mighook> 2 namespace: openshift-migration spec: activeDeadlineSeconds: 1800 3 custom: false 4 image: <hook_image> 5 playbook: <ansible_playbook_base64> 6 targetCluster: source 7 1 Optional: A unique hash is appended to the value for this parameter so that each migration hook has a unique name. You do not need to specify the value of the name parameter. 2 Specify the migration hook name, unless you specify the value of the generateName parameter. 3 Optional: Specify the maximum number of seconds that a hook can run. The default is 1800 . 4 The hook is a custom image if true . The custom image can include Ansible or it can be written in a different programming language. 5 Specify the custom image, for example, quay.io/konveyor/hook-runner:latest . Required if custom is true . 6 Base64-encoded Ansible playbook. Required if custom is false . 7 Specify the cluster on which the hook will run. Valid values are source or destination . 11.2.8. MigMigration The MigMigration CR runs a MigPlan CR. You can configure a Migmigration CR to run a stage or incremental migration, to cancel a migration in progress, or to roll back a completed migration. apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <migmigration> namespace: openshift-migration spec: canceled: false 1 rollback: false 2 stage: false 3 quiescePods: true 4 keepAnnotations: true 5 verify: false 6 migPlanRef: name: <migplan> namespace: openshift-migration 1 Set to true to cancel a migration in progress. 2 Set to true to roll back a completed migration. 3 Set to true to run a stage migration. Data is copied incrementally and the pods on the source cluster are not stopped. 4 Set to true to stop the application during migration. The pods on the source cluster are scaled to 0 after the Backup stage. 5 Set to true to retain the labels and annotations applied during the migration. 6 Set to true to check the status of the migrated pods on the destination cluster are checked and to return the names of pods that are not in a Running state. 11.2.9. MigPlan The MigPlan CR defines the parameters of a migration plan. You can configure destination namespaces, hook phases, and direct or indirect migration. Note By default, a destination namespace has the same name as the source namespace. If you configure a different destination namespace, you must ensure that the namespaces are not duplicated on the source or the destination clusters because the UID and GID ranges are copied during migration. apiVersion: migration.openshift.io/v1alpha1 kind: MigPlan metadata: labels: controller-tools.k8s.io: "1.0" name: <migplan> namespace: openshift-migration spec: closed: false 1 srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration hooks: 2 - executionNamespace: <namespace> 3 phase: <migration_phase> 4 reference: name: <hook> 5 namespace: <hook_namespace> 6 serviceAccount: <service_account> 7 indirectImageMigration: true 8 indirectVolumeMigration: false 9 migStorageRef: name: <migstorage> namespace: openshift-migration namespaces: - <source_namespace_1> 10 - <source_namespace_2> - <source_namespace_3>:<destination_namespace_4> 11 refresh: false 12 1 The migration has completed if true . You cannot create another MigMigration CR for this MigPlan CR. 2 Optional: You can specify up to four migration hooks. Each hook must run during a different migration phase. 3 Optional: Specify the namespace in which the hook will run. 4 Optional: Specify the migration phase during which a hook runs. One hook can be assigned to one phase. Valid values are PreBackup , PostBackup , PreRestore , and PostRestore . 5 Optional: Specify the name of the MigHook CR. 6 Optional: Specify the namespace of MigHook CR. 7 Optional: Specify a service account with cluster-admin privileges. 8 Direct image migration is disabled if true . Images are copied from the source cluster to the replication repository and from the replication repository to the destination cluster. 9 Direct volume migration is disabled if true . PVs are copied from the source cluster to the replication repository and from the replication repository to the destination cluster. 10 Specify one or more source namespaces. If you specify only the source namespace, the destination namespace is the same. 11 Specify the destination namespace if it is different from the source namespace. 12 The MigPlan CR is validated if true . 11.2.10. MigStorage The MigStorage CR describes the object storage for the replication repository. Amazon Web Services (AWS), Microsoft Azure, Google Cloud Storage, Multi-Cloud Object Gateway, and generic S3-compatible cloud storage are supported. AWS and the snapshot copy method have additional parameters. apiVersion: migration.openshift.io/v1alpha1 kind: MigStorage metadata: labels: controller-tools.k8s.io: "1.0" name: <migstorage> namespace: openshift-migration spec: backupStorageProvider: <backup_storage_provider> 1 volumeSnapshotProvider: <snapshot_storage_provider> 2 backupStorageConfig: awsBucketName: <bucket> 3 awsRegion: <region> 4 credsSecretRef: namespace: openshift-config name: <storage_secret> 5 awsKmsKeyId: <key_id> 6 awsPublicUrl: <public_url> 7 awsSignatureVersion: <signature_version> 8 volumeSnapshotConfig: awsRegion: <region> 9 credsSecretRef: namespace: openshift-config name: <storage_secret> 10 refresh: false 11 1 Specify the storage provider. 2 Snapshot copy method only: Specify the storage provider. 3 AWS only: Specify the bucket name. 4 AWS only: Specify the bucket region, for example, us-east-1 . 5 Specify the name of the Secret object that you created for the storage. 6 AWS only: If you are using the AWS Key Management Service, specify the unique identifier of the key. 7 AWS only: If you granted public access to the AWS bucket, specify the bucket URL. 8 AWS only: Specify the AWS signature version for authenticating requests to the bucket, for example, 4 . 9 Snapshot copy method only: Specify the geographical region of the clusters. 10 Snapshot copy method only: Specify the name of the Secret object that you created for the storage. 11 Set to true to validate the cluster. 11.3. Logs and debugging tools This section describes logs and debugging tools that you can use for troubleshooting. 11.3.1. Viewing migration plan resources You can view migration plan resources to monitor a running migration or to troubleshoot a failed migration by using the MTC web console and the command line interface (CLI). Procedure In the MTC web console, click Migration Plans . Click the Migrations number to a migration plan to view the Migrations page. Click a migration to view the Migration details . Expand Migration resources to view the migration resources and their status in a tree view. Note To troubleshoot a failed migration, start with a high-level resource that has failed and then work down the resource tree towards the lower-level resources. Click the Options menu to a resource and select one of the following options: Copy oc describe command copies the command to your clipboard. Log in to the relevant cluster and then run the command. The conditions and events of the resource are displayed in YAML format. Copy oc logs command copies the command to your clipboard. Log in to the relevant cluster and then run the command. If the resource supports log filtering, a filtered log is displayed. View JSON displays the resource data in JSON format in a web browser. The data is the same as the output for the oc get <resource> command. 11.3.2. Viewing a migration plan log You can view an aggregated log for a migration plan. You use the MTC web console to copy a command to your clipboard and then run the command from the command line interface (CLI). The command displays the filtered logs of the following pods: Migration Controller Velero Restic Rsync Stunnel Registry Procedure In the MTC web console, click Migration Plans . Click the Migrations number to a migration plan. Click View logs . Click the Copy icon to copy the oc logs command to your clipboard. Log in to the relevant cluster and enter the command on the CLI. The aggregated log for the migration plan is displayed. 11.3.3. Using the migration log reader You can use the migration log reader to display a single filtered view of all the migration logs. Procedure Get the mig-log-reader pod: USD oc -n openshift-migration get pods | grep log Enter the following command to display a single migration log: USD oc -n openshift-migration logs -f <mig-log-reader-pod> -c color 1 1 The -c plain option displays the log without colors. 11.3.4. Accessing performance metrics The MigrationController custom resource (CR) records metrics and pulls them into on-cluster monitoring storage. You can query the metrics by using Prometheus Query Language (PromQL) to diagnose migration performance issues. All metrics are reset when the Migration Controller pod restarts. You can access the performance metrics and run queries by using the OpenShift Container Platform web console. Procedure In the OpenShift Container Platform web console, click Observe Metrics . Enter a PromQL query, select a time window to display, and click Run Queries . If your web browser does not display all the results, use the Prometheus console. 11.3.4.1. Provided metrics The MigrationController custom resource (CR) provides metrics for the MigMigration CR count and for its API requests. 11.3.4.1.1. cam_app_workload_migrations This metric is a count of MigMigration CRs over time. It is useful for viewing alongside the mtc_client_request_count and mtc_client_request_elapsed metrics to collate API request information with migration status changes. This metric is included in Telemetry. Table 11.1. cam_app_workload_migrations metric Queryable label name Sample label values Label description status running , idle , failed , completed Status of the MigMigration CR type stage, final Type of the MigMigration CR 11.3.4.1.2. mtc_client_request_count This metric is a cumulative count of Kubernetes API requests that MigrationController issued. It is not included in Telemetry. Table 11.2. mtc_client_request_count metric Queryable label name Sample label values Label description cluster https://migcluster-url:443 Cluster that the request was issued against component MigPlan , MigCluster Sub-controller API that issued request function (*ReconcileMigPlan).Reconcile Function that the request was issued from kind SecretList , Deployment Kubernetes kind the request was issued for 11.3.4.1.3. mtc_client_request_elapsed This metric is a cumulative latency, in milliseconds, of Kubernetes API requests that MigrationController issued. It is not included in Telemetry. Table 11.3. mtc_client_request_elapsed metric Queryable label name Sample label values Label description cluster https://cluster-url.com:443 Cluster that the request was issued against component migplan , migcluster Sub-controller API that issued request function (*ReconcileMigPlan).Reconcile Function that the request was issued from kind SecretList , Deployment Kubernetes resource that the request was issued for 11.3.4.1.4. Useful queries The table lists some helpful queries that can be used for monitoring performance. Table 11.4. Useful queries Query Description mtc_client_request_count Number of API requests issued, sorted by request type sum(mtc_client_request_count) Total number of API requests issued mtc_client_request_elapsed API request latency, sorted by request type sum(mtc_client_request_elapsed) Total latency of API requests sum(mtc_client_request_elapsed) / sum(mtc_client_request_count) Average latency of API requests mtc_client_request_elapsed / mtc_client_request_count Average latency of API requests, sorted by request type cam_app_workload_migrations{status="running"} * 100 Count of running migrations, multiplied by 100 for easier viewing alongside request counts 11.3.5. Using the must-gather tool You can collect logs, metrics, and information about MTC custom resources by using the must-gather tool. The must-gather data must be attached to all customer cases. You can collect data for a one-hour or a 24-hour period and view the data with the Prometheus console. Prerequisites You must be logged in to the OpenShift Container Platform cluster as a user with the cluster-admin role. You must have the OpenShift CLI ( oc ) installed. Procedure Navigate to the directory where you want to store the must-gather data. Run the oc adm must-gather command for one of the following data collection options: To collect data for the past 24 hours, run the following command: USD oc adm must-gather --image=registry.redhat.io/rhmtc/openshift-migration-must-gather-rhel8:v1.8 This command saves the data as the must-gather/must-gather.tar.gz file. You can upload this file to a support case on the Red Hat Customer Portal . To collect data for the past 24 hours, run the following command: USD oc adm must-gather --image=registry.redhat.io/rhmtc/openshift-migration-must-gather-rhel8:v1.8 -- /usr/bin/gather_metrics_dump This operation can take a long time. This command saves the data as the must-gather/metrics/prom_data.tar.gz file. 11.3.6. Debugging Velero resources with the Velero CLI tool You can debug Backup and Restore custom resources (CRs) and retrieve logs with the Velero CLI tool. The Velero CLI tool provides more detailed information than the OpenShift CLI tool. Syntax Use the oc exec command to run a Velero CLI command: USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ <backup_restore_cr> <command> <cr_name> Example USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql Help option Use the velero --help option to list all Velero CLI commands: USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ --help Describe command Use the velero describe command to retrieve a summary of warnings and errors associated with a Backup or Restore CR: USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ <backup_restore_cr> describe <cr_name> Example USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql The following types of restore errors and warnings are shown in the output of a velero describe request: Velero : A list of messages related to the operation of Velero itself, for example, messages related to connecting to the cloud, reading a backup file, and so on Cluster : A list of messages related to backing up or restoring cluster-scoped resources Namespaces : A list of list of messages related to backing up or restoring resources stored in namespaces One or more errors in one of these categories results in a Restore operation receiving the status of PartiallyFailed and not Completed . Warnings do not lead to a change in the completion status. Important For resource-specific errors, that is, Cluster and Namespaces errors, the restore describe --details output includes a resource list that lists all resources that Velero succeeded in restoring. For any resource that has such an error, check to see if the resource is actually in the cluster. If there are Velero errors, but no resource-specific errors, in the output of a describe command, it is possible that the restore completed without any actual problems in restoring workloads, but carefully validate post-restore applications. For example, if the output contains PodVolumeRestore or node agent-related errors, check the status of PodVolumeRestores and DataDownloads . If none of these are failed or still running, then volume data might have been fully restored. Logs command Use the velero logs command to retrieve the logs of a Backup or Restore CR: USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ <backup_restore_cr> logs <cr_name> Example USD oc -n openshift-migration exec deployment/velero -c velero -- ./velero \ restore logs ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf 11.3.7. Debugging a partial migration failure You can debug a partial migration failure warning message by using the Velero CLI to examine the Restore custom resource (CR) logs. A partial failure occurs when Velero encounters an issue that does not cause a migration to fail. For example, if a custom resource definition (CRD) is missing or if there is a discrepancy between CRD versions on the source and target clusters, the migration completes but the CR is not created on the target cluster. Velero logs the issue as a partial failure and then processes the rest of the objects in the Backup CR. Procedure Check the status of a MigMigration CR: USD oc get migmigration <migmigration> -o yaml Example output status: conditions: - category: Warn durable: true lastTransitionTime: "2021-01-26T20:48:40Z" message: 'Final Restore openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf: partially failed on destination cluster' status: "True" type: VeleroFinalRestorePartiallyFailed - category: Advisory durable: true lastTransitionTime: "2021-01-26T20:48:42Z" message: The migration has completed with warnings, please look at `Warn` conditions. reason: Completed status: "True" type: SucceededWithWarnings Check the status of the Restore CR by using the Velero describe command: USD oc -n {namespace} exec deployment/velero -c velero -- ./velero \ restore describe <restore> Example output Phase: PartiallyFailed (run 'velero restore logs ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf' for more information) Errors: Velero: <none> Cluster: <none> Namespaces: migration-example: error restoring example.com/migration-example/migration-example: the server could not find the requested resource Check the Restore CR logs by using the Velero logs command: USD oc -n {namespace} exec deployment/velero -c velero -- ./velero \ restore logs <restore> Example output time="2021-01-26T20:48:37Z" level=info msg="Attempting to restore migration-example: migration-example" logSource="pkg/restore/restore.go:1107" restore=openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf time="2021-01-26T20:48:37Z" level=info msg="error restoring migration-example: the server could not find the requested resource" logSource="pkg/restore/restore.go:1170" restore=openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf The Restore CR log error message, the server could not find the requested resource , indicates the cause of the partially failed migration. 11.3.8. Using MTC custom resources for troubleshooting You can check the following Migration Toolkit for Containers (MTC) custom resources (CRs) to troubleshoot a failed migration: MigCluster MigStorage MigPlan BackupStorageLocation The BackupStorageLocation CR contains a migrationcontroller label to identify the MTC instance that created the CR: labels: migrationcontroller: ebe13bee-c803-47d0-a9e9-83f380328b93 VolumeSnapshotLocation The VolumeSnapshotLocation CR contains a migrationcontroller label to identify the MTC instance that created the CR: labels: migrationcontroller: ebe13bee-c803-47d0-a9e9-83f380328b93 MigMigration Backup MTC changes the reclaim policy of migrated persistent volumes (PVs) to Retain on the target cluster. The Backup CR contains an openshift.io/orig-reclaim-policy annotation that indicates the original reclaim policy. You can manually restore the reclaim policy of the migrated PVs. Restore Procedure List the MigMigration CRs in the openshift-migration namespace: USD oc get migmigration -n openshift-migration Example output NAME AGE 88435fe0-c9f8-11e9-85e6-5d593ce65e10 6m42s Inspect the MigMigration CR: USD oc describe migmigration 88435fe0-c9f8-11e9-85e6-5d593ce65e10 -n openshift-migration The output is similar to the following examples. MigMigration example output name: 88435fe0-c9f8-11e9-85e6-5d593ce65e10 namespace: openshift-migration labels: <none> annotations: touch: 3b48b543-b53e-4e44-9d34-33563f0f8147 apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: creationTimestamp: 2019-08-29T01:01:29Z generation: 20 resourceVersion: 88179 selfLink: /apis/migration.openshift.io/v1alpha1/namespaces/openshift-migration/migmigrations/88435fe0-c9f8-11e9-85e6-5d593ce65e10 uid: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 spec: migPlanRef: name: socks-shop-mig-plan namespace: openshift-migration quiescePods: true stage: false status: conditions: category: Advisory durable: True lastTransitionTime: 2019-08-29T01:03:40Z message: The migration has completed successfully. reason: Completed status: True type: Succeeded phase: Completed startTimestamp: 2019-08-29T01:01:29Z events: <none> Velero backup CR #2 example output that describes the PV data apiVersion: velero.io/v1 kind: Backup metadata: annotations: openshift.io/migrate-copy-phase: final openshift.io/migrate-quiesce-pods: "true" openshift.io/migration-registry: 172.30.105.179:5000 openshift.io/migration-registry-dir: /socks-shop-mig-plan-registry-44dd3bd5-c9f8-11e9-95ad-0205fe66cbb6 openshift.io/orig-reclaim-policy: delete creationTimestamp: "2019-08-29T01:03:15Z" generateName: 88435fe0-c9f8-11e9-85e6-5d593ce65e10- generation: 1 labels: app.kubernetes.io/part-of: migration migmigration: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 migration-stage-backup: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 velero.io/storage-location: myrepo-vpzq9 name: 88435fe0-c9f8-11e9-85e6-5d593ce65e10-59gb7 namespace: openshift-migration resourceVersion: "87313" selfLink: /apis/velero.io/v1/namespaces/openshift-migration/backups/88435fe0-c9f8-11e9-85e6-5d593ce65e10-59gb7 uid: c80dbbc0-c9f8-11e9-95ad-0205fe66cbb6 spec: excludedNamespaces: [] excludedResources: [] hooks: resources: [] includeClusterResources: null includedNamespaces: - sock-shop includedResources: - persistentvolumes - persistentvolumeclaims - namespaces - imagestreams - imagestreamtags - secrets - configmaps - pods labelSelector: matchLabels: migration-included-stage-backup: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 storageLocation: myrepo-vpzq9 ttl: 720h0m0s volumeSnapshotLocations: - myrepo-wv6fx status: completionTimestamp: "2019-08-29T01:02:36Z" errors: 0 expiration: "2019-09-28T01:02:35Z" phase: Completed startTimestamp: "2019-08-29T01:02:35Z" validationErrors: null version: 1 volumeSnapshotsAttempted: 0 volumeSnapshotsCompleted: 0 warnings: 0 Velero restore CR #2 example output that describes the Kubernetes resources apiVersion: velero.io/v1 kind: Restore metadata: annotations: openshift.io/migrate-copy-phase: final openshift.io/migrate-quiesce-pods: "true" openshift.io/migration-registry: 172.30.90.187:5000 openshift.io/migration-registry-dir: /socks-shop-mig-plan-registry-36f54ca7-c925-11e9-825a-06fa9fb68c88 creationTimestamp: "2019-08-28T00:09:49Z" generateName: e13a1b60-c927-11e9-9555-d129df7f3b96- generation: 3 labels: app.kubernetes.io/part-of: migration migmigration: e18252c9-c927-11e9-825a-06fa9fb68c88 migration-final-restore: e18252c9-c927-11e9-825a-06fa9fb68c88 name: e13a1b60-c927-11e9-9555-d129df7f3b96-gb8nx namespace: openshift-migration resourceVersion: "82329" selfLink: /apis/velero.io/v1/namespaces/openshift-migration/restores/e13a1b60-c927-11e9-9555-d129df7f3b96-gb8nx uid: 26983ec0-c928-11e9-825a-06fa9fb68c88 spec: backupName: e13a1b60-c927-11e9-9555-d129df7f3b96-sz24f excludedNamespaces: null excludedResources: - nodes - events - events.events.k8s.io - backups.velero.io - restores.velero.io - resticrepositories.velero.io includedNamespaces: null includedResources: null namespaceMapping: null restorePVs: true status: errors: 0 failureReason: "" phase: Completed validationErrors: null warnings: 15 11.4. Common issues and concerns This section describes common issues and concerns that can cause issues during migration. 11.4.1. Direct volume migration does not complete If direct volume migration does not complete, the target cluster might not have the same node-selector annotations as the source cluster. Migration Toolkit for Containers (MTC) migrates namespaces with all annotations to preserve security context constraints and scheduling requirements. During direct volume migration, MTC creates Rsync transfer pods on the target cluster in the namespaces that were migrated from the source cluster. If a target cluster namespace does not have the same annotations as the source cluster namespace, the Rsync transfer pods cannot be scheduled. The Rsync pods remain in a Pending state. You can identify and fix this issue by performing the following procedure. Procedure Check the status of the MigMigration CR: USD oc describe migmigration <pod> -n openshift-migration The output includes the following status message: Example output Some or all transfer pods are not running for more than 10 mins on destination cluster On the source cluster, obtain the details of a migrated namespace: USD oc get namespace <namespace> -o yaml 1 1 Specify the migrated namespace. On the target cluster, edit the migrated namespace: USD oc edit namespace <namespace> Add the missing openshift.io/node-selector annotations to the migrated namespace as in the following example: apiVersion: v1 kind: Namespace metadata: annotations: openshift.io/node-selector: "region=east" ... Run the migration plan again. 11.4.2. Error messages and resolutions This section describes common error messages you might encounter with the Migration Toolkit for Containers (MTC) and how to resolve their underlying causes. 11.4.2.1. CA certificate error displayed when accessing the MTC console for the first time If a CA certificate error message is displayed the first time you try to access the MTC console, the likely cause is the use of self-signed CA certificates in one of the clusters. To resolve this issue, navigate to the oauth-authorization-server URL displayed in the error message and accept the certificate. To resolve this issue permanently, add the certificate to the trust store of your web browser. If an Unauthorized message is displayed after you have accepted the certificate, navigate to the MTC console and refresh the web page. 11.4.2.2. OAuth timeout error in the MTC console If a connection has timed out message is displayed in the MTC console after you have accepted a self-signed certificate, the causes are likely to be the following: Interrupted network access to the OAuth server Interrupted network access to the OpenShift Container Platform console Proxy configuration that blocks access to the oauth-authorization-server URL. See MTC console inaccessible because of OAuth timeout error for details. To determine the cause of the timeout: Inspect the MTC console web page with a browser web inspector. Check the Migration UI pod log for errors. 11.4.2.3. Certificate signed by unknown authority error If you use a self-signed certificate to secure a cluster or a replication repository for the MTC, certificate verification might fail with the following error message: Certificate signed by unknown authority . You can create a custom CA certificate bundle file and upload it in the MTC web console when you add a cluster or a replication repository. Procedure Download a CA certificate from a remote endpoint and save it as a CA bundle file: USD echo -n | openssl s_client -connect <host_FQDN>:<port> \ 1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > <ca_bundle.cert> 2 1 Specify the host FQDN and port of the endpoint, for example, api.my-cluster.example.com:6443 . 2 Specify the name of the CA bundle file. 11.4.2.4. Backup storage location errors in the Velero pod log If a Velero Backup custom resource contains a reference to a backup storage location (BSL) that does not exist, the Velero pod log might display the following error messages: USD oc logs <Velero_Pod> -n openshift-migration Example output level=error msg="Error checking repository for stale locks" error="error getting backup storage location: BackupStorageLocation.velero.io \"ts-dpa-1\" not found" error.file="/remote-source/src/github.com/vmware-tanzu/velero/pkg/restic/repository_manager.go:259" You can ignore these error messages. A missing BSL cannot cause a migration to fail. 11.4.2.5. Pod volume backup timeout error in the Velero pod log If a migration fails because Restic times out, the following error is displayed in the Velero pod log. level=error msg="Error backing up item" backup=velero/monitoring error="timed out waiting for all PodVolumeBackups to complete" error.file="/go/src/github.com/heptio/velero/pkg/restic/backupper.go:165" error.function="github.com/heptio/velero/pkg/restic.(*backupper).BackupPodVolumes" group=v1 The default value of restic_timeout is one hour. You can increase this parameter for large migrations, keeping in mind that a higher value may delay the return of error messages. Procedure In the OpenShift Container Platform web console, navigate to Operators Installed Operators . Click Migration Toolkit for Containers Operator . In the MigrationController tab, click migration-controller . In the YAML tab, update the following parameter value: spec: restic_timeout: 1h 1 1 Valid units are h (hours), m (minutes), and s (seconds), for example, 3h30m15s . Click Save . 11.4.2.6. Restic verification errors in the MigMigration custom resource If data verification fails when migrating a persistent volume with the file system data copy method, the following error is displayed in the MigMigration CR. Example output status: conditions: - category: Warn durable: true lastTransitionTime: 2020-04-16T20:35:16Z message: There were verify errors found in 1 Restic volume restores. See restore `<registry-example-migration-rvwcm>` for details 1 status: "True" type: ResticVerifyErrors 2 1 The error message identifies the Restore CR name. 2 ResticVerifyErrors is a general error warning type that includes verification errors. Note A data verification error does not cause the migration process to fail. You can check the Restore CR to identify the source of the data verification error. Procedure Log in to the target cluster. View the Restore CR: USD oc describe <registry-example-migration-rvwcm> -n openshift-migration The output identifies the persistent volume with PodVolumeRestore errors. Example output status: phase: Completed podVolumeRestoreErrors: - kind: PodVolumeRestore name: <registry-example-migration-rvwcm-98t49> namespace: openshift-migration podVolumeRestoreResticErrors: - kind: PodVolumeRestore name: <registry-example-migration-rvwcm-98t49> namespace: openshift-migration View the PodVolumeRestore CR: USD oc describe <migration-example-rvwcm-98t49> The output identifies the Restic pod that logged the errors. Example output completionTimestamp: 2020-05-01T20:49:12Z errors: 1 resticErrors: 1 ... resticPod: <restic-nr2v5> View the Restic pod log to locate the errors: USD oc logs -f <restic-nr2v5> 11.4.2.7. Restic permission error when migrating from NFS storage with root_squash enabled If you are migrating data from NFS storage and root_squash is enabled, Restic maps to nfsnobody and does not have permission to perform the migration. The following error is displayed in the Restic pod log. Example output backup=openshift-migration/<backup_id> controller=pod-volume-backup error="fork/exec /usr/bin/restic: permission denied" error.file="/go/src/github.com/vmware-tanzu/velero/pkg/controller/pod_volume_backup_controller.go:280" error.function="github.com/vmware-tanzu/velero/pkg/controller.(*podVolumeBackupController).processBackup" logSource="pkg/controller/pod_volume_backup_controller.go:280" name=<backup_id> namespace=openshift-migration You can resolve this issue by creating a supplemental group for Restic and adding the group ID to the MigrationController CR manifest. Procedure Create a supplemental group for Restic on the NFS storage. Set the setgid bit on the NFS directories so that group ownership is inherited. Add the restic_supplemental_groups parameter to the MigrationController CR manifest on the source and target clusters: spec: restic_supplemental_groups: <group_id> 1 1 Specify the supplemental group ID. Wait for the Restic pods to restart so that the changes are applied. 11.4.3. Applying the Skip SELinux relabel workaround with spc_t automatically on workloads running on OpenShift Container Platform When attempting to migrate a namespace with Migration Toolkit for Containers (MTC) and a substantial volume associated with it, the rsync-server may become frozen without any further information to troubleshoot the issue. 11.4.3.1. Diagnosing the need for the Skip SELinux relabel workaround Search for an error of Unable to attach or mount volumes for pod... timed out waiting for the condition in the kubelet logs from the node where the rsync-server for the Direct Volume Migration (DVM) runs. Example kubelet log kubenswrapper[3879]: W0326 16:30:36.749224 3879 volume_linux.go:49] Setting volume ownership for /var/lib/kubelet/pods/8905d88e-6531-4d65-9c2a-eff11dc7eb29/volumes/kubernetes.io~csi/pvc-287d1988-3fd9-4517-a0c7-22539acd31e6/mount and fsGroup set. If the volume has a lot of files then setting volume ownership could be slow, see https://github.com/kubernetes/kubernetes/issues/69699 kubenswrapper[3879]: E0326 16:32:02.706363 3879 kubelet.go:1841] "Unable to attach or mount volumes for pod; skipping pod" err="unmounted volumes=[8db9d5b032dab17d4ea9495af12e085a], unattached volumes=[crane2-rsync-server-secret 8db9d5b032dab17d4ea9495af12e085a kube-api-access-dlbd2 crane2-stunnel-server-config crane2-stunnel-server-secret crane2-rsync-server-config]: timed out waiting for the condition" pod="caboodle-preprod/rsync-server" kubenswrapper[3879]: E0326 16:32:02.706496 3879 pod_workers.go:965] "Error syncing pod, skipping" err="unmounted volumes=[8db9d5b032dab17d4ea9495af12e085a], unattached volumes=[crane2-rsync-server-secret 8db9d5b032dab17d4ea9495af12e085a kube-api-access-dlbd2 crane2-stunnel-server-config crane2-stunnel-server-secret crane2-rsync-server-config]: timed out waiting for the condition" pod="caboodle-preprod/rsync-server" podUID=8905d88e-6531-4d65-9c2a-eff11dc7eb29 11.4.3.2. Resolving using the Skip SELinux relabel workaround To resolve this issue, set the migration_rsync_super_privileged parameter to true in both the source and destination MigClusters using the MigrationController custom resource (CR). Example MigrationController CR apiVersion: migration.openshift.io/v1alpha1 kind: MigrationController metadata: name: migration-controller namespace: openshift-migration spec: migration_rsync_super_privileged: true 1 azure_resource_group: "" cluster_name: host mig_namespace_limit: "10" mig_pod_limit: "100" mig_pv_limit: "100" migration_controller: true migration_log_reader: true migration_ui: true migration_velero: true olm_managed: true restic_timeout: 1h version: 1.8.3 1 The value of the migration_rsync_super_privileged parameter indicates whether or not to run Rsync Pods as super privileged containers ( spc_t selinux context ). Valid settings are true or false . 11.5. Rolling back a migration You can roll back a migration by using the MTC web console or the CLI. You can also roll back a migration manually . 11.5.1. Rolling back a migration by using the MTC web console You can roll back a migration by using the Migration Toolkit for Containers (MTC) web console. Note The following resources remain in the migrated namespaces for debugging after a failed direct volume migration (DVM): Config maps (source and destination clusters) Secret objects (source and destination clusters) Rsync CRs (source cluster) These resources do not affect rollback. You can delete them manually. If you later run the same migration plan successfully, the resources from the failed migration are deleted automatically. If your application was stopped during a failed migration, you must roll back the migration to prevent data corruption in the persistent volume. Rollback is not required if the application was not stopped during migration because the original application is still running on the source cluster. Procedure In the MTC web console, click Migration plans . Click the Options menu beside a migration plan and select Rollback under Migration . Click Rollback and wait for rollback to complete. In the migration plan details, Rollback succeeded is displayed. Verify that rollback was successful in the OpenShift Container Platform web console of the source cluster: Click Home Projects . Click the migrated project to view its status. In the Routes section, click Location to verify that the application is functioning, if applicable. Click Workloads Pods to verify that the pods are running in the migrated namespace. Click Storage Persistent volumes to verify that the migrated persistent volume is correctly provisioned. 11.5.2. Rolling back a migration from the command line interface You can roll back a migration by creating a MigMigration custom resource (CR) from the command line interface. Note The following resources remain in the migrated namespaces for debugging after a failed direct volume migration (DVM): Config maps (source and destination clusters) Secret objects (source and destination clusters) Rsync CRs (source cluster) These resources do not affect rollback. You can delete them manually. If you later run the same migration plan successfully, the resources from the failed migration are deleted automatically. If your application was stopped during a failed migration, you must roll back the migration to prevent data corruption in the persistent volume. Rollback is not required if the application was not stopped during migration because the original application is still running on the source cluster. Procedure Create a MigMigration CR based on the following example: USD cat << EOF | oc apply -f - apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <migmigration> namespace: openshift-migration spec: ... rollback: true ... migPlanRef: name: <migplan> 1 namespace: openshift-migration EOF 1 Specify the name of the associated MigPlan CR. In the MTC web console, verify that the migrated project resources have been removed from the target cluster. Verify that the migrated project resources are present in the source cluster and that the application is running. 11.5.3. Rolling back a migration manually You can roll back a failed migration manually by deleting the stage pods and unquiescing the application. If you run the same migration plan successfully, the resources from the failed migration are deleted automatically. Note The following resources remain in the migrated namespaces after a failed direct volume migration (DVM): Config maps (source and destination clusters) Secret objects (source and destination clusters) Rsync CRs (source cluster) These resources do not affect rollback. You can delete them manually. Procedure Delete the stage pods on all clusters: USD oc delete USD(oc get pods -l migration.openshift.io/is-stage-pod -n <namespace>) 1 1 Namespaces specified in the MigPlan CR. Unquiesce the application on the source cluster by scaling the replicas to their premigration number: USD oc scale deployment <deployment> --replicas=<premigration_replicas> The migration.openshift.io/preQuiesceReplicas annotation in the Deployment CR displays the premigration number of replicas: apiVersion: extensions/v1beta1 kind: Deployment metadata: annotations: deployment.kubernetes.io/revision: "1" migration.openshift.io/preQuiesceReplicas: "1" Verify that the application pods are running on the source cluster: USD oc get pod -n <namespace> Additional resources Deleting Operators from a cluster using the web console

Commands:
apiVersion: migration.openshift.io/v1alpha1 kind: DirectImageMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_image_migration> spec: srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration namespaces: 1 - <source_namespace_1> - <source_namespace_2>:<destination_namespace_3> 2
apiVersion: migration.openshift.io/v1alpha1 kind: DirectImageStreamMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_image_stream_migration> spec: srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration imageStreamRef: name: <image_stream> namespace: <source_image_stream_namespace> destNamespace: <destination_image_stream_namespace>
apiVersion: migration.openshift.io/v1alpha1 kind: DirectVolumeMigration metadata: name: <direct_volume_migration> namespace: openshift-migration spec: createDestinationNamespaces: false 1 deleteProgressReportingCRs: false 2 destMigClusterRef: name: <host_cluster> 3 namespace: openshift-migration persistentVolumeClaims: - name: <pvc> 4 namespace: <pvc_namespace> srcMigClusterRef: name: <source_cluster> namespace: openshift-migration
apiVersion: migration.openshift.io/v1alpha1 kind: DirectVolumeMigrationProgress metadata: labels: controller-tools.k8s.io: "1.0" name: <direct_volume_migration_progress> spec: clusterRef: name: <source_cluster> namespace: openshift-migration podRef: name: <rsync_pod> namespace: openshift-migration
apiVersion: migration.openshift.io/v1alpha1 kind: MigAnalytic metadata: annotations: migplan: <migplan> name: <miganalytic> namespace: openshift-migration labels: migplan: <migplan> spec: analyzeImageCount: true 1 analyzeK8SResources: true 2 analyzePVCapacity: true 3 listImages: false 4 listImagesLimit: 50 5 migPlanRef: name: <migplan> namespace: openshift-migration
apiVersion: migration.openshift.io/v1alpha1 kind: MigCluster metadata: labels: controller-tools.k8s.io: "1.0" name: <host_cluster> 1 namespace: openshift-migration spec: isHostCluster: true 2 The 'azureResourceGroup' parameter is relevant only for Microsoft Azure. azureResourceGroup: <azure_resource_group> 3 caBundle: <ca_bundle_base64> 4 insecure: false 5 refresh: false 6 The 'restartRestic' parameter is relevant for a source cluster. restartRestic: true 7 The following parameters are relevant for a remote cluster. exposedRegistryPath: <registry_route> 8 url: <destination_cluster_url> 9 serviceAccountSecretRef: name: <source_secret> 10 namespace: openshift-config
apiVersion: migration.openshift.io/v1alpha1 kind: MigHook metadata: generateName: <hook_name_prefix> 1 name: <mighook> 2 namespace: openshift-migration spec: activeDeadlineSeconds: 1800 3 custom: false 4 image: <hook_image> 5 playbook: <ansible_playbook_base64> 6 targetCluster: source 7
apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <migmigration> namespace: openshift-migration spec: canceled: false 1 rollback: false 2 stage: false 3 quiescePods: true 4 keepAnnotations: true 5 verify: false 6 migPlanRef: name: <migplan> namespace: openshift-migration
apiVersion: migration.openshift.io/v1alpha1 kind: MigPlan metadata: labels: controller-tools.k8s.io: "1.0" name: <migplan> namespace: openshift-migration spec: closed: false 1 srcMigClusterRef: name: <source_cluster> namespace: openshift-migration destMigClusterRef: name: <destination_cluster> namespace: openshift-migration hooks: 2 - executionNamespace: <namespace> 3 phase: <migration_phase> 4 reference: name: <hook> 5 namespace: <hook_namespace> 6 serviceAccount: <service_account> 7 indirectImageMigration: true 8 indirectVolumeMigration: false 9 migStorageRef: name: <migstorage> namespace: openshift-migration namespaces: - <source_namespace_1> 10 - <source_namespace_2> - <source_namespace_3>:<destination_namespace_4> 11 refresh: false 12
apiVersion: migration.openshift.io/v1alpha1 kind: MigStorage metadata: labels: controller-tools.k8s.io: "1.0" name: <migstorage> namespace: openshift-migration spec: backupStorageProvider: <backup_storage_provider> 1 volumeSnapshotProvider: <snapshot_storage_provider> 2 backupStorageConfig: awsBucketName: <bucket> 3 awsRegion: <region> 4 credsSecretRef: namespace: openshift-config name: <storage_secret> 5 awsKmsKeyId: <key_id> 6 awsPublicUrl: <public_url> 7 awsSignatureVersion: <signature_version> 8 volumeSnapshotConfig: awsRegion: <region> 9 credsSecretRef: namespace: openshift-config name: <storage_secret> 10 refresh: false 11
oc -n openshift-migration get pods | grep log
oc -n openshift-migration logs -f <mig-log-reader-pod> -c color 1
oc adm must-gather --image=registry.redhat.io/rhmtc/openshift-migration-must-gather-rhel8:v1.8
oc adm must-gather --image=registry.redhat.io/rhmtc/openshift-migration-must-gather-rhel8:v1.8 -- /usr/bin/gather_metrics_dump
oc -n openshift-migration exec deployment/velero -c velero -- ./velero <backup_restore_cr> <command> <cr_name>
oc -n openshift-migration exec deployment/velero -c velero -- ./velero backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql
oc -n openshift-migration exec deployment/velero -c velero -- ./velero --help
oc -n openshift-migration exec deployment/velero -c velero -- ./velero <backup_restore_cr> describe <cr_name>
oc -n openshift-migration exec deployment/velero -c velero -- ./velero backup describe 0e44ae00-5dc3-11eb-9ca8-df7e5254778b-2d8ql
oc -n openshift-migration exec deployment/velero -c velero -- ./velero <backup_restore_cr> logs <cr_name>
oc -n openshift-migration exec deployment/velero -c velero -- ./velero restore logs ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf
oc get migmigration <migmigration> -o yaml
status: conditions: - category: Warn durable: true lastTransitionTime: "2021-01-26T20:48:40Z" message: 'Final Restore openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf: partially failed on destination cluster' status: "True" type: VeleroFinalRestorePartiallyFailed - category: Advisory durable: true lastTransitionTime: "2021-01-26T20:48:42Z" message: The migration has completed with warnings, please look at `Warn` conditions. reason: Completed status: "True" type: SucceededWithWarnings
oc -n {namespace} exec deployment/velero -c velero -- ./velero restore describe <restore>
Phase: PartiallyFailed (run 'velero restore logs ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf' for more information) Errors: Velero: <none> Cluster: <none> Namespaces: migration-example: error restoring example.com/migration-example/migration-example: the server could not find the requested resource
oc -n {namespace} exec deployment/velero -c velero -- ./velero restore logs <restore>
time="2021-01-26T20:48:37Z" level=info msg="Attempting to restore migration-example: migration-example" logSource="pkg/restore/restore.go:1107" restore=openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf time="2021-01-26T20:48:37Z" level=info msg="error restoring migration-example: the server could not find the requested resource" logSource="pkg/restore/restore.go:1170" restore=openshift-migration/ccc7c2d0-6017-11eb-afab-85d0007f5a19-x4lbf
labels: migrationcontroller: ebe13bee-c803-47d0-a9e9-83f380328b93
labels: migrationcontroller: ebe13bee-c803-47d0-a9e9-83f380328b93
oc get migmigration -n openshift-migration
NAME AGE 88435fe0-c9f8-11e9-85e6-5d593ce65e10 6m42s
oc describe migmigration 88435fe0-c9f8-11e9-85e6-5d593ce65e10 -n openshift-migration
name: 88435fe0-c9f8-11e9-85e6-5d593ce65e10 namespace: openshift-migration labels: <none> annotations: touch: 3b48b543-b53e-4e44-9d34-33563f0f8147 apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: creationTimestamp: 2019-08-29T01:01:29Z generation: 20 resourceVersion: 88179 selfLink: /apis/migration.openshift.io/v1alpha1/namespaces/openshift-migration/migmigrations/88435fe0-c9f8-11e9-85e6-5d593ce65e10 uid: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 spec: migPlanRef: name: socks-shop-mig-plan namespace: openshift-migration quiescePods: true stage: false status: conditions: category: Advisory durable: True lastTransitionTime: 2019-08-29T01:03:40Z message: The migration has completed successfully. reason: Completed status: True type: Succeeded phase: Completed startTimestamp: 2019-08-29T01:01:29Z events: <none>
apiVersion: velero.io/v1 kind: Backup metadata: annotations: openshift.io/migrate-copy-phase: final openshift.io/migrate-quiesce-pods: "true" openshift.io/migration-registry: 172.30.105.179:5000 openshift.io/migration-registry-dir: /socks-shop-mig-plan-registry-44dd3bd5-c9f8-11e9-95ad-0205fe66cbb6 openshift.io/orig-reclaim-policy: delete creationTimestamp: "2019-08-29T01:03:15Z" generateName: 88435fe0-c9f8-11e9-85e6-5d593ce65e10- generation: 1 labels: app.kubernetes.io/part-of: migration migmigration: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 migration-stage-backup: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 velero.io/storage-location: myrepo-vpzq9 name: 88435fe0-c9f8-11e9-85e6-5d593ce65e10-59gb7 namespace: openshift-migration resourceVersion: "87313" selfLink: /apis/velero.io/v1/namespaces/openshift-migration/backups/88435fe0-c9f8-11e9-85e6-5d593ce65e10-59gb7 uid: c80dbbc0-c9f8-11e9-95ad-0205fe66cbb6 spec: excludedNamespaces: [] excludedResources: [] hooks: resources: [] includeClusterResources: null includedNamespaces: - sock-shop includedResources: - persistentvolumes - persistentvolumeclaims - namespaces - imagestreams - imagestreamtags - secrets - configmaps - pods labelSelector: matchLabels: migration-included-stage-backup: 8886de4c-c9f8-11e9-95ad-0205fe66cbb6 storageLocation: myrepo-vpzq9 ttl: 720h0m0s volumeSnapshotLocations: - myrepo-wv6fx status: completionTimestamp: "2019-08-29T01:02:36Z" errors: 0 expiration: "2019-09-28T01:02:35Z" phase: Completed startTimestamp: "2019-08-29T01:02:35Z" validationErrors: null version: 1 volumeSnapshotsAttempted: 0 volumeSnapshotsCompleted: 0 warnings: 0
apiVersion: velero.io/v1 kind: Restore metadata: annotations: openshift.io/migrate-copy-phase: final openshift.io/migrate-quiesce-pods: "true" openshift.io/migration-registry: 172.30.90.187:5000 openshift.io/migration-registry-dir: /socks-shop-mig-plan-registry-36f54ca7-c925-11e9-825a-06fa9fb68c88 creationTimestamp: "2019-08-28T00:09:49Z" generateName: e13a1b60-c927-11e9-9555-d129df7f3b96- generation: 3 labels: app.kubernetes.io/part-of: migration migmigration: e18252c9-c927-11e9-825a-06fa9fb68c88 migration-final-restore: e18252c9-c927-11e9-825a-06fa9fb68c88 name: e13a1b60-c927-11e9-9555-d129df7f3b96-gb8nx namespace: openshift-migration resourceVersion: "82329" selfLink: /apis/velero.io/v1/namespaces/openshift-migration/restores/e13a1b60-c927-11e9-9555-d129df7f3b96-gb8nx uid: 26983ec0-c928-11e9-825a-06fa9fb68c88 spec: backupName: e13a1b60-c927-11e9-9555-d129df7f3b96-sz24f excludedNamespaces: null excludedResources: - nodes - events - events.events.k8s.io - backups.velero.io - restores.velero.io - resticrepositories.velero.io includedNamespaces: null includedResources: null namespaceMapping: null restorePVs: true status: errors: 0 failureReason: "" phase: Completed validationErrors: null warnings: 15
oc describe migmigration <pod> -n openshift-migration
Some or all transfer pods are not running for more than 10 mins on destination cluster
oc get namespace <namespace> -o yaml 1
oc edit namespace <namespace>
apiVersion: v1 kind: Namespace metadata: annotations: openshift.io/node-selector: "region=east"
echo -n | openssl s_client -connect <host_FQDN>:<port> \ 1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > <ca_bundle.cert> 2
oc logs <Velero_Pod> -n openshift-migration
level=error msg="Error checking repository for stale locks" error="error getting backup storage location: BackupStorageLocation.velero.io \"ts-dpa-1\" not found" error.file="/remote-source/src/github.com/vmware-tanzu/velero/pkg/restic/repository_manager.go:259"
level=error msg="Error backing up item" backup=velero/monitoring error="timed out waiting for all PodVolumeBackups to complete" error.file="/go/src/github.com/heptio/velero/pkg/restic/backupper.go:165" error.function="github.com/heptio/velero/pkg/restic.(*backupper).BackupPodVolumes" group=v1
spec: restic_timeout: 1h 1
status: conditions: - category: Warn durable: true lastTransitionTime: 2020-04-16T20:35:16Z message: There were verify errors found in 1 Restic volume restores. See restore `<registry-example-migration-rvwcm>` for details 1 status: "True" type: ResticVerifyErrors 2
oc describe <registry-example-migration-rvwcm> -n openshift-migration
status: phase: Completed podVolumeRestoreErrors: - kind: PodVolumeRestore name: <registry-example-migration-rvwcm-98t49> namespace: openshift-migration podVolumeRestoreResticErrors: - kind: PodVolumeRestore name: <registry-example-migration-rvwcm-98t49> namespace: openshift-migration
oc describe <migration-example-rvwcm-98t49>
completionTimestamp: 2020-05-01T20:49:12Z errors: 1 resticErrors: 1 resticPod: <restic-nr2v5>
oc logs -f <restic-nr2v5>
backup=openshift-migration/<backup_id> controller=pod-volume-backup error="fork/exec /usr/bin/restic: permission denied" error.file="/go/src/github.com/vmware-tanzu/velero/pkg/controller/pod_volume_backup_controller.go:280" error.function="github.com/vmware-tanzu/velero/pkg/controller.(*podVolumeBackupController).processBackup" logSource="pkg/controller/pod_volume_backup_controller.go:280" name=<backup_id> namespace=openshift-migration
spec: restic_supplemental_groups: <group_id> 1
kubenswrapper[3879]: W0326 16:30:36.749224 3879 volume_linux.go:49] Setting volume ownership for /var/lib/kubelet/pods/8905d88e-6531-4d65-9c2a-eff11dc7eb29/volumes/kubernetes.io~csi/pvc-287d1988-3fd9-4517-a0c7-22539acd31e6/mount and fsGroup set. If the volume has a lot of files then setting volume ownership could be slow, see https://github.com/kubernetes/kubernetes/issues/69699 kubenswrapper[3879]: E0326 16:32:02.706363 3879 kubelet.go:1841] "Unable to attach or mount volumes for pod; skipping pod" err="unmounted volumes=[8db9d5b032dab17d4ea9495af12e085a], unattached volumes=[crane2-rsync-server-secret 8db9d5b032dab17d4ea9495af12e085a kube-api-access-dlbd2 crane2-stunnel-server-config crane2-stunnel-server-secret crane2-rsync-server-config]: timed out waiting for the condition" pod="caboodle-preprod/rsync-server" kubenswrapper[3879]: E0326 16:32:02.706496 3879 pod_workers.go:965] "Error syncing pod, skipping" err="unmounted volumes=[8db9d5b032dab17d4ea9495af12e085a], unattached volumes=[crane2-rsync-server-secret 8db9d5b032dab17d4ea9495af12e085a kube-api-access-dlbd2 crane2-stunnel-server-config crane2-stunnel-server-secret crane2-rsync-server-config]: timed out waiting for the condition" pod="caboodle-preprod/rsync-server" podUID=8905d88e-6531-4d65-9c2a-eff11dc7eb29
apiVersion: migration.openshift.io/v1alpha1 kind: MigrationController metadata: name: migration-controller namespace: openshift-migration spec: migration_rsync_super_privileged: true 1 azure_resource_group: "" cluster_name: host mig_namespace_limit: "10" mig_pod_limit: "100" mig_pv_limit: "100" migration_controller: true migration_log_reader: true migration_ui: true migration_velero: true olm_managed: true restic_timeout: 1h version: 1.8.3
cat << EOF | oc apply -f - apiVersion: migration.openshift.io/v1alpha1 kind: MigMigration metadata: labels: controller-tools.k8s.io: "1.0" name: <migmigration> namespace: openshift-migration spec: rollback: true migPlanRef: name: <migplan> 1 namespace: openshift-migration EOF
oc delete USD(oc get pods -l migration.openshift.io/is-stage-pod -n <namespace>) 1
oc scale deployment <deployment> --replicas=<premigration_replicas>
apiVersion: extensions/v1beta1 kind: Deployment metadata: annotations: deployment.kubernetes.io/revision: "1" migration.openshift.io/preQuiesceReplicas: "1"
oc get pod -n <namespace>