Chapter 13. Troubleshooting and maintaining the Load-balancing service Basic troubleshooting and maintenance for the Load-balancing service (octavia) starts with being familiar with the OpenStack client commands for showing status and migrating instances, and knowing how to access logs. If you need to troubleshoot more in depth, you can SSH into one or more Load-balancing service instances (amphorae). Section 13.1, "Verifying the load balancer" Section 13.2, "Load-balancing service instance administrative logs" Section 13.3, "Migrating a specific Load-balancing service instance" Section 13.4, "Using SSH to connect to load-balancing instances" Section 13.5, "Showing listener statistics" Section 13.6, "Interpreting listener request errors" 13.1. Verifying the load balancer You can troubleshoot the Load-balancing service (octavia) and its various components by viewing the output of the load balancer show and list commands. Procedure Source your credentials file. Example Verify the load balancer ( lb1 ) settings. Note Values inside parentheses are sample values that are used in the example commands in this procedure. Substitute these sample values with values that are appropriate for your site. Example Sample output Using the loadbalancer ID ( 265d0b71-c073-40f4-9718-8a182c6d53ca ) from the step, obtain the ID of the amphora associated with the load balancer ( lb1 ). Example Sample output Using the amphora ID ( 1afabefd-ba09-49e1-8c39-41770aa25070 ) from the step, view amphora information. Example Sample output View the listener ( listener1 ) details. Example Sample output View the pool ( pool1 ) and load-balancer members. Example Sample output Verify HTTPS traffic flows across a load balancer whose listener is configured for HTTPS or TERMINATED_HTTPS protocols by connecting to the VIP address ( 192.0.2.177 ) of the load balancer. Tip Obtain the load-balancer VIP address by using the command, openstack loadbalancer show <load_balancer_name> . Note Security groups implemented for the load balancer VIP only allow data traffic for the required protocols and ports. For this reason you cannot ping load balancer VIPs, because ICMP traffic is blocked. Example Sample output Additional resources loadbalancer in the Command Line Interface Reference 13.2. Load-balancing service instance administrative logs The administrative log offloading feature of the Load-balancing service instance (amphora) covers all of the system logging inside the amphora except for the tenant flow logs. You can send tenant flow logs to the same syslog receiver where the administrative logs are sent. You can send tenant flow logs to the same syslog receiver that processes the administrative logs, but you must configure the tenant flow logs separately. The amphora sends all administrative log messages by using the native log format for the application sending the message. The amphorae log to the Red Hat OpenStack Platform (RHOSP) Controller node in the same location as the other RHOSP logs ( /var/log/containers/octavia/ ). Additional resources Chapter 5, Managing Load-balancing service instance logs 13.3. Migrating a specific Load-balancing service instance In some cases you must migrate a Load-balancing service instance (amphora). For example, if the host is being shut down for maintenance Procedure Source your credentials file. Example Locate the ID of the amphora that you want to migrate. You need to provide the ID in a later step. To prevent the Compute scheduler service from scheduling any new amphorae to the Compute node being evacuated, disable the Compute node ( compute-host-1 ). Note Values inside parentheses are sample values that are used in the example commands in this procedure. Substitute these sample values with values that are appropriate for your site. Example Fail over the amphora by using the amphora ID ( ea17210a-1076-48ff-8a1f-ced49ccb5e53 ) that you obtained. Example Additional resources compute service set in the Command Line Interface Reference loadbalancer in the Command Line Interface Reference 13.4. Using SSH to connect to load-balancing instances Use SSH to log in to Load-balancing service instances (amphorae) when troubleshooting service problems. It can be helpful to use Secure Shell (SSH) to log into running Load-balancing service instances (amphorae) when troubleshooting service problems. Prerequisites You must have the Load-balancing service (octavia) SSH private key. Procedure On the director node, start ssh-agent and add your user identity key to the agent: Source your credentials file. Example Determine the IP address on the load-balancing management network ( lb_network_ip ) for the amphora that you want to connect to: Use SSH to connect to the amphora: When you are finished, close your connection to the amphora and stop the SSH agent: Additional resources loadbalancer in the Command Line Interface Reference 13.5. Showing listener statistics Using the OpenStack Client, you can obtain statistics about the listener for a particular Red Hat OpenStack Platform (RHOSP) loadbalancer: current active connections ( active_connections ). total bytes received ( bytes_in ). total bytes sent ( bytes_out ). total requests that were unable to be fulfilled ( request_errors ). total connections handled ( total_connections ). Procedure Source your credentials file. Example View the stats for the listener ( listener1 ). Note Values inside parentheses are sample values that are used in the example commands in this procedure. Substitute these sample values with values that are appropriate for your site. Example Tip If you do not know the name of the listener, enter the command loadbalancer listener list . Sample output Additional resources loadbalancer listener stats show in the Command Line Interface Reference Section 13.6, "Interpreting listener request errors" 13.6. Interpreting listener request errors You can obtain statistics about the listener for a particular Red Hat OpenStack Platform (RHOSP) loadbalancer. For more information, see Section 13.5, "Showing listener statistics" . One of the statistics tracked by the RHOSP loadbalancer, request_errors , is only counting errors that occurred in the request from the end user connecting to the load balancer. The request_errors variable is not measuring errors reported by the member server. For example, if a tenant connects through the RHOSP Load-balancing service (octavia) to a web server that returns an HTTP status code of 400 (Bad Request) , this error is not collected by the Load-balancing service. Loadbalancers do not inspect the content of data traffic. In this example, the loadbalancer interprets this flow as successful because it transported information between the user and the web server correctly. The following conditions can cause the request_errors variable to increment: early termination from the client, before the request has been sent. read error from the client. client timeout. client closed the connection. various bad requests from the client. Additional resources loadbalancer listener stats show in the Command Line Interface Reference Section 13.5, "Showing listener statistics"

Commands:
source ~/overcloudrc
openstack loadbalancer show lb1
+---------------------+--------------------------------------+ | Field | Value | +---------------------+--------------------------------------+ | admin_state_up | True | | created_at | 2022-02-17T15:59:18 | | description | | | flavor_id | None | | id | 265d0b71-c073-40f4-9718-8a182c6d53ca | | listeners | 5aaa67da-350d-4125-9022-238e0f7b7f6f | | name | lb1 | | operating_status | ONLINE | | pools | 48f6664c-b192-4763-846a-da568354da4a | | project_id | 52376c9c5c2e434283266ae7cacd3a9c | | provider | amphora | | provisioning_status | ACTIVE | | updated_at | 2022-02-17T16:01:21 | | vip_address | 192.0.2.177 | | vip_network_id | afeaf55e-7128-4dff-80e2-98f8d1f2f44c | | vip_port_id | 94a12275-1505-4cdc-80c9-4432767a980f | | vip_qos_policy_id | None | | vip_subnet_id | 06ffa90e-2b86-4fe3-9731-c7839b0be6de | +---------------------+--------------------------------------+
openstack loadbalancer amphora list | grep 265d0b71-c073-40f4-9718-8a182c6d53ca
| 1afabefd-ba09-49e1-8c39-41770aa25070 | 265d0b71-c073-40f4-9718-8a182c6d53ca | ALLOCATED | STANDALONE | 198.51.100.7 | 192.0.2.177 |
openstack loadbalancer amphora show 1afabefd-ba09-49e1-8c39-41770aa25070
+-----------------+--------------------------------------+ | Field | Value | +-----------------+--------------------------------------+ | id | 1afabefd-ba09-49e1-8c39-41770aa25070 | | loadbalancer_id | 265d0b71-c073-40f4-9718-8a182c6d53ca | | compute_id | ba9fc1c4-8aee-47ad-b47f-98f12ea7b200 | | lb_network_ip | 198.51.100.7 | | vrrp_ip | 192.0.2.36 | | ha_ip | 192.0.2.177 | | vrrp_port_id | 07dcd894-487a-48dc-b0ec-7324fe5d2082 | | ha_port_id | 94a12275-1505-4cdc-80c9-4432767a980f | | cert_expiration | 2022-03-19T15:59:23 | | cert_busy | False | | role | STANDALONE | | status | ALLOCATED | | vrrp_interface | None | | vrrp_id | 1 | | vrrp_priority | None | | cached_zone | nova | | created_at | 2022-02-17T15:59:22 | | updated_at | 2022-02-17T16:00:50 | | image_id | 53001253-5005-4891-bb61-8784ae85e962 | | compute_flavor | 65 | +-----------------+--------------------------------------+
openstack loadbalancer listener show listener1
+-----------------------------+--------------------------------------+ | Field | Value | +-----------------------------+--------------------------------------+ | admin_state_up | True | | connection_limit | -1 | | created_at | 2022-02-17T16:00:59 | | default_pool_id | 48f6664c-b192-4763-846a-da568354da4a | | default_tls_container_ref | None | | description | | | id | 5aaa67da-350d-4125-9022-238e0f7b7f6f | | insert_headers | None | | l7policies | | | loadbalancers | 265d0b71-c073-40f4-9718-8a182c6d53ca | | name | listener1 | | operating_status | ONLINE | | project_id | 52376c9c5c2e434283266ae7cacd3a9c | | protocol | HTTP | | protocol_port | 80 | | provisioning_status | ACTIVE | | sni_container_refs | [] | | timeout_client_data | 50000 | | timeout_member_connect | 5000 | | timeout_member_data | 50000 | | timeout_tcp_inspect | 0 | | updated_at | 2022-02-17T16:01:21 | | client_ca_tls_container_ref | None | | client_authentication | NONE | | client_crl_container_ref | None | | allowed_cidrs | None | +-----------------------------+--------------------------------------+
openstack loadbalancer pool show pool1
+----------------------+--------------------------------------+ | Field | Value | +----------------------+--------------------------------------+ | admin_state_up | True | | created_at | 2022-02-17T16:01:08 | | description | | | healthmonitor_id | 4b24180f-74c7-47d2-b0a2-4783ada9a4f0 | | id | 48f6664c-b192-4763-846a-da568354da4a | | lb_algorithm | ROUND_ROBIN | | listeners | 5aaa67da-350d-4125-9022-238e0f7b7f6f | | loadbalancers | 265d0b71-c073-40f4-9718-8a182c6d53ca | | members | b92694bd-3407-461a-92f2-90fb2c4aedd1 | | | 4ccdd1cf-736d-4b31-b67c-81d5f49e528d | | name | pool1 | | operating_status | ONLINE | | project_id | 52376c9c5c2e434283266ae7cacd3a9c | | protocol | HTTP | | provisioning_status | ACTIVE | | session_persistence | None | | updated_at | 2022-02-17T16:01:21 | | tls_container_ref | None | | ca_tls_container_ref | None | | crl_container_ref | None | | tls_enabled | False | +----------------------+--------------------------------------+
curl -v https://192.0.2.177 --insecure
* About to connect() to 192.0.2.177 port 443 (#0) * Trying 192.0.2.177 * Connected to 192.0.2.177 (192.0.2.177) port 443 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * skipping SSL peer certificate verification * SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 * Server certificate: * subject: CN=www.example.com,O=Dis,L=Springfield,ST=Denial,C=US * start date: Jan 15 09:21:45 2021 GMT * expire date: Jan 15 09:21:45 2021 GMT * common name: www.example.com * issuer: CN=www.example.com,O=Dis,L=Springfield,ST=Denial,C=US > GET / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 192.0.2.177 > Accept: */* > < HTTP/1.1 200 OK < Content-Length: 30 < * Connection #0 to host 192.0.2.177 left intact
source ~/overcloudrc
openstack loadbalancer amphora list
openstack compute service set compute-host-1 nova-compute --disable
openstack loadbalancer amphora failover ea17210a-1076-48ff-8a1f-ced49ccb5e53
eval USD(ssh-agent -s) ssh-add
source ~/overcloudrc
openstack loadbalancer amphora list
ssh -A -t heat-admin@<controller_node_IP_address> ssh cloud-user@<lb_network_ip>
exit
source ~/overcloudrc
openstack loadbalancer listener stats show listener1
+--------------------+-------+ | Field | Value | +--------------------+-------+ | active_connections | 0 | | bytes_in | 0 | | bytes_out | 0 | | request_errors | 0 | | total_connections | 0 | +--------------------+-------+