Chapter 4. Managing a Red Hat Ceph Storage cluster using cephadm-ansible modules As a storage administrator, you can use cephadm-ansible modules in Ansible playbooks to administer your Red Hat Ceph Storage cluster. The cephadm-ansible package provides several modules that wrap cephadm calls to let you write your own unique Ansible playbooks to administer your cluster. Note At this time, cephadm-ansible modules only support the most important tasks. Any operation not covered by cephadm-ansible modules must be completed using either the command or shell Ansible modules in your playbooks. 4.1. The cephadm-ansible modules The cephadm-ansible modules are a collection of modules that simplify writing Ansible playbooks by providing a wrapper around cephadm and ceph orch commands. You can use the modules to write your own unique Ansible playbooks to administer your cluster using one or more of the modules. The cephadm-ansible package includes the following modules: cephadm_bootstrap ceph_orch_host ceph_config ceph_orch_apply ceph_orch_daemon cephadm_registry_login 4.2. The cephadm-ansible modules options The following tables list the available options for the cephadm-ansible modules. Options listed as required need to be set when using the modules in your Ansible playbooks. Options listed with a default value of true indicate that the option is automatically set when using the modules and you do not need to specify it in your playbook. For example, for the cephadm_bootstrap module, the Ceph Dashboard is installed unless you set dashboard: false . Table 4.1. Available options for the cephadm_bootstrap module. cephadm_bootstrap Description Required Default mon_ip Ceph Monitor IP address. true image Ceph container image. false docker Use docker instead of podman . false fsid Define the Ceph FSID. false pull Pull the Ceph container image. false true dashboard Deploy the Ceph Dashboard. false true dashboard_user Specify a specific Ceph Dashboard user. false dashboard_password Ceph Dashboard password. false monitoring Deploy the monitoring stack. false true firewalld Manage firewall rules with firewalld. false true allow_overwrite Allow overwrite of existing --output-config, --output-keyring, or --output-pub-ssh-key files. false false registry_url URL for custom registry. false registry_username Username for custom registry. false registry_password Password for custom registry. false registry_json JSON file with custom registry login information. false ssh_user SSH user to use for cephadm ssh to hosts. false ssh_config SSH config file path for cephadm SSH client. false allow_fqdn_hostname Allow hostname that is a fully-qualified domain name (FQDN). false false cluster_network Subnet to use for cluster replication, recovery and heartbeats. false Table 4.2. Available options for the ceph_orch_host module. ceph_orch_host Description Required Default fsid The FSID of the Ceph cluster to interact with. false image The Ceph container image to use. false name Name of the host to add, remove, or update. true address IP address of the host. true when state is present . set_admin_label Set the _admin label on the specified host. false false labels The list of labels to apply to the host. false [] state If set to present , it ensures the name specified in name is present. If set to absent , it removes the host specified in name . If set to drain , it schedules to remove all daemons from the host specified in name . false present Table 4.3. Available options for the ceph_config module ceph_config Description Required Default fsid The FSID of the Ceph cluster to interact with. false image The Ceph container image to use. false action Whether to set or get the parameter specified in option . false set who Which daemon to set the configuration to. true option Name of the parameter to set or get . true value Value of the parameter to set. true if action is set Table 4.4. Available options for the ceph_orch_apply module. ceph_orch_apply Description Required fsid The FSID of the Ceph cluster to interact with. false image The Ceph container image to use. false spec The service specification to apply. true Table 4.5. Available options for the ceph_orch_daemon module. ceph_orch_daemon Description Required fsid The FSID of the Ceph cluster to interact with. false image The Ceph container image to use. false state The desired state of the service specified in name . true If started , it ensures the service is started. If stopped , it ensures the service is stopped. If restarted , it will restart the service. daemon_id The ID of the service. true daemon_type The type of service. true Table 4.6. Available options for the cephadm_registry_login module cephadm_registry_login Description Required Default state Login or logout of a registry. false login docker Use docker instead of podman . false registry_url The URL for custom registry. false registry_username Username for custom registry. true when state is login . registry_password Password for custom registry. true when state is login . registry_json The path to a JSON file. This file must be present on remote hosts prior to running this task. This option is currently not supported. 4.3. Bootstrapping a storage cluster using the cephadm_bootstrap and cephadm_registry_login modules As a storage administrator, you can bootstrap a storage cluster using Ansible by using the cephadm_bootstrap and cephadm_registry_login modules in your Ansible playbook. Prerequisites An IP address for the first Ceph Monitor container, which is also the IP address for the first node in the storage cluster. Login access to registry.redhat.io . A minimum of 10 GB of free space for /var/lib/containers/ . Red Hat Enterprise Linux 8.4 EUS or Red Hat Enterprise Linux 8.5. Installation of the cephadm-ansible package on the Ansible administration node. Passwordless SSH is set up on all hosts in the storage cluster. Hosts are registered with CDN. Procedure Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Create the hosts file and add hosts, labels, and monitor IP address of the first host in the storage cluster: Syntax Example Run the preflight playbook: Syntax Example Create a playbook to bootstrap your cluster: Syntax Example Run the playbook: Syntax Example Verification Review the Ansible output after running the playbook. 4.4. Adding or removing hosts using the ceph_orch_host module As a storage administrator, you can add and remove hosts in your storage cluster by using the ceph_orch_host module in your Ansible playbook. Prerequisites A running Red Hat Ceph Storage cluster. Register the nodes to the CDN and attach subscriptions. Ansible user with sudo and passwordless SSH access to all nodes in the storage cluster. Installation of the cephadm-ansible package on the Ansible administration node. New hosts have the storage cluster's public SSH key. For more information about copying the storage cluster's public SSH keys to new hosts, see Adding hosts in the Red Hat Ceph Storage Installation Guide . Procedure Use the following procedure to add new hosts to the cluster: Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Add the new hosts and labels to the Ansible inventory file. Syntax Example Note If you have previously added the new hosts to the Ansible inventory file and ran the preflight playbook on the hosts, skip to step 3. Run the preflight playbook with the --limit option: Syntax Example The preflight playbook installs podman , lvm2 , chrony , and cephadm on the new host. After installation is complete, cephadm resides in the /usr/sbin/ directory. Create a playbook to add the new hosts to the cluster: Syntax Note By default, Ansible executes all tasks on the host that matches the hosts line of your playbook. The ceph orch commands must run on the host that contains the admin keyring and the Ceph configuration file. Use the delegate_to keyword to specify the admin host in your cluster. Example In this example, the playbook adds the new hosts to the cluster and displays a current list of hosts. Run the playbook to add additional hosts to the cluster: Syntax Example Use the following procedure to remove hosts from the cluster: Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Create a playbook to remove a host or hosts from the cluster: Syntax Example In this example, the playbook tasks drain all daemons on host07 , removes the host from the cluster, and displays a current list of hosts. Run the playbook to remove host from the cluster: Syntax Example Verification Review the Ansible task output displaying the current list of hosts in the cluster: Example 4.5. Setting configuration options using the ceph_config module As a storage administrator, you can set or get Red Hat Ceph Storage configuration options using the ceph_config module. Prerequisites A running Red Hat Ceph Storage cluster. Ansible user with sudo and passwordless SSH access to all nodes in the storage cluster. Installation of the cephadm-ansible package on the Ansible administration node. The Ansible inventory file contains the cluster and admin hosts. Procedure Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Create a playbook with configuration changes: Syntax Example In this example, the playbook first sets the mon_allow_pool_delete option to false . The playbook then gets the current mon_allow_pool_delete setting and displays the value in the Ansible output. Run the playbook: Syntax Example Verification Review the output from the playbook tasks. Example Additional Resources See the Red Hat Ceph Storage Configuration Guide for more details on configuration options. 4.6. Applying a service specification using the ceph_orch_apply module As a storage administrator, you can apply service specifications to your storage cluster using the ceph_orch_apply module in your Ansible playbooks. A service specification is a data structure to specify the service attributes and configuration settings that is used to deploy the Ceph service. You can use a service specification to deploy Ceph service types like mon , crash , mds , mgr , osd , rdb , or rbd-mirror . Prerequisites A running Red Hat Ceph Storage cluster. Ansible user with sudo and passwordless SSH access to all nodes in the storage cluster. Installation of the cephadm-ansible package on the Ansible administration node. The Ansible inventory file contains the cluster and admin hosts. Procedure Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Create a playbook with the service specifications: Syntax Example In this example, the playbook deploys the Ceph OSD service on all hosts with the label osd . Run the playbook: Syntax Example Verification Review the output from the playbook tasks. Additional Resources See the Red Hat Ceph Storage Operations Guide for more details on service specification options. 4.7. Managing Ceph daemon states using the ceph_orch_daemon module As a storage administrator, you can start, stop, and restart Ceph daemons on hosts using the ceph_orch_daemon module in your Ansible playbooks. Prerequisites A running Red Hat Ceph Storage cluster. Ansible user with sudo and passwordless SSH access to all nodes in the storage cluster. Installation of the cephadm-ansible package on the Ansible administration node. The Ansible inventory file contains the cluster and admin hosts. Procedure Log in to the Ansible administration node. Navigate to the /usr/share/cephadm-ansible directory on the Ansible administration node: Example Create a playbook with daemon state changes: Syntax Example In this example, the playbook starts the OSD with an ID of 0 and stops a Ceph Monitor with an id of host02 . Run the playbook: Syntax Example Verification Review the output from the playbook tasks.

Commands:
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi INVENTORY_FILE HOST1 labels="[' LABEL1 ', ' LABEL2 ']" HOST2 labels="[' LABEL1 ', ' LABEL2 ']" HOST3 labels="[' LABEL1 ']" [admin] ADMIN_HOST monitor_address= MONITOR_IP_ADDRESS labels="[' ADMIN_LABEL ', ' LABEL1 ', ' LABEL2 ']"
[ceph-admin@admin cephadm-ansible]USD sudo vi hosts host02 labels="['mon', 'mgr']" host03 labels="['mon', 'mgr']" host04 labels="['osd']" host05 labels="['osd']" host06 labels="['osd']" [admin] host01 monitor_address=10.10.128.68 labels="['_admin', 'mon', 'mgr']"
ansible-playbook -i INVENTORY_FILE cephadm-preflight.yml --extra-vars "ceph_origin=rhcs"
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts cephadm-preflight.yml --extra-vars "ceph_origin=rhcs"
sudo vi PLAYBOOK_FILENAME .yml --- - name: NAME_OF_PLAY hosts: BOOTSTRAP_HOST become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: -name: NAME_OF_TASK cephadm_registry_login: state: STATE registry_url: REGISTRY_URL registry_username: REGISTRY_USER_NAME registry_password: REGISTRY_PASSWORD - name: NAME_OF_TASK cephadm_bootstrap: mon_ip: "{{ monitor_address }}" dashboard_user: DASHBOARD_USER dashboard_password: DASHBOARD_PASSWORD allow_fqdn_hostname: ALLOW_FQDN_HOSTNAME cluster_network: NETWORK_CIDR
[ceph-admin@admin cephadm-ansible]USD sudo vi bootstrap.yml --- - name: bootstrap the cluster hosts: host01 become: true gather_facts: false tasks: - name: login to registry cephadm_registry_login: state: login registry_url: registry.redhat.io registry_username: user1 registry_password: mypassword1 - name: bootstrap initial cluster cephadm_bootstrap: mon_ip: "{{ monitor_address }}" dashboard_user: mydashboarduser dashboard_password: mydashboardpassword allow_fqdn_hostname: true cluster_network: 10.10.128.0/28
ansible-playbook -i INVENTORY_FILE PLAYBOOK_FILENAME .yml -vvv
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts bootstrap.yml -vvv
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi INVENTORY_FILE NEW_HOST1 labels="[' LABEL1 ', ' LABEL2 ']" NEW_HOST2 labels="[' LABEL1 ', ' LABEL2 ']" NEW_HOST3 labels="[' LABEL1 ']" [admin] ADMIN_HOST monitor_address= MONITOR_IP_ADDRESS labels="[' ADMIN_LABEL ', ' LABEL1 ', ' LABEL2 ']"
[ceph-admin@admin cephadm-ansible]USD sudo vi hosts host02 labels="['mon', 'mgr']" host03 labels="['mon', 'mgr']" host04 labels="['osd']" host05 labels="['osd']" host06 labels="['osd']" [admin] host01 monitor_address= 10.10.128.68 labels="['_admin', 'mon', 'mgr']"
ansible-playbook -i INVENTORY_FILE cephadm-preflight.yml --extra-vars "ceph_origin=rhcs" --limit NEWHOST
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts cephadm-preflight.yml --extra-vars "ceph_origin=rhcs" --limit host02
sudo vi PLAYBOOK_FILENAME .yml --- - name: PLAY_NAME hosts: HOSTS_OR_HOST_GROUPS become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: - name: NAME_OF_TASK ceph_orch_host: name: "{{ ansible_facts['hostname'] }}" address: "{{ ansible_facts['default_ipv4']['address'] }}" labels: "{{ labels }}" delegate_to: HOST_TO_DELEGATE_TASK_TO - name: NAME_OF_TASK when: inventory_hostname in groups['admin'] ansible.builtin.shell: cmd: CEPH_COMMAND_TO_RUN register: REGISTER_NAME - name: NAME_OF_TASK when: inventory_hostname in groups['admin'] debug: msg: "{{ REGISTER_NAME .stdout }}"
[ceph-admin@admin cephadm-ansible]USD sudo vi add-hosts.yml --- - name: add additional hosts to the cluster hosts: all become: true gather_facts: true tasks: - name: add hosts to the cluster ceph_orch_host: name: "{{ ansible_facts['hostname'] }}" address: "{{ ansible_facts['default_ipv4']['address'] }}" labels: "{{ labels }}" delegate_to: host01 - name: list hosts in the cluster when: inventory_hostname in groups['admin'] ansible.builtin.shell: cmd: ceph orch host ls register: host_list - name: print current list of hosts when: inventory_hostname in groups['admin'] debug: msg: "{{ host_list.stdout }}"
ansible-playbook -i INVENTORY_FILE PLAYBOOK_FILENAME .yml
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts add-hosts.yml
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi PLAYBOOK_FILENAME .yml --- - name: NAME_OF_PLAY hosts: ADMIN_HOST become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: - name: NAME_OF_TASK ceph_orch_host: name: HOST_TO_REMOVE state: STATE - name: NAME_OF_TASK ceph_orch_host: name: HOST_TO_REMOVE state: STATE retries: NUMBER_OF_RETRIES delay: DELAY until: CONTINUE_UNTIL register: REGISTER_NAME - name: NAME_OF_TASK ansible.builtin.shell: cmd: ceph orch host ls register: REGISTER_NAME - name: NAME_OF_TASK debug: msg: "{{ REGISTER_NAME .stdout }}"
[ceph-admin@admin cephadm-ansible]USD sudo vi remove-hosts.yml --- - name: remove host hosts: host01 become: true gather_facts: true tasks: - name: drain host07 ceph_orch_host: name: host07 state: drain - name: remove host from the cluster ceph_orch_host: name: host07 state: absent retries: 20 delay: 1 until: result is succeeded register: result - name: list hosts in the cluster ansible.builtin.shell: cmd: ceph orch host ls register: host_list - name: print current list of hosts debug: msg: "{{ host_list.stdout }}"
ansible-playbook -i INVENTORY_FILE PLAYBOOK_FILENAME .yml
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts remove-hosts.yml
TASK [print current hosts] ****************************************************************************************************** Friday 24 June 2022 14:52:40 -0400 (0:00:03.365) 0:02:31.702 *********** ok: [host01] => msg: |- HOST ADDR LABELS STATUS host01 10.10.128.68 _admin mon mgr host02 10.10.128.69 mon mgr host03 10.10.128.70 mon mgr host04 10.10.128.71 osd host05 10.10.128.72 osd host06 10.10.128.73 osd
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi PLAYBOOK_FILENAME .yml --- - name: PLAY_NAME hosts: ADMIN_HOST become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: - name: NAME_OF_TASK ceph_config: action: GET_OR_SET who: DAEMON_TO_SET_CONFIGURATION_TO option: CEPH_CONFIGURATION_OPTION value: VALUE_OF_PARAMETER_TO_SET - name: NAME_OF_TASK ceph_config: action: GET_OR_SET who: DAEMON_TO_SET_CONFIGURATION_TO option: CEPH_CONFIGURATION_OPTION register: REGISTER_NAME - name: NAME_OF_TASK debug: msg: " MESSAGE_TO_DISPLAY {{ REGISTER_NAME .stdout }}"
[ceph-admin@admin cephadm-ansible]USD sudo vi change_configuration.yml --- - name: set pool delete hosts: host01 become: true gather_facts: false tasks: - name: set the allow pool delete option ceph_config: action: set who: mon option: mon_allow_pool_delete value: true - name: get the allow pool delete setting ceph_config: action: get who: mon option: mon_allow_pool_delete register: verify_mon_allow_pool_delete - name: print current mon_allow_pool_delete setting debug: msg: "the value of 'mon_allow_pool_delete' is {{ verify_mon_allow_pool_delete.stdout }}"
ansible-playbook -i INVENTORY_FILE _PLAYBOOK_FILENAME .yml
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts change_configuration.yml
TASK [print current mon_allow_pool_delete setting] ************************************************************* Wednesday 29 June 2022 13:51:41 -0400 (0:00:05.523) 0:00:17.953 ******** ok: [host01] => msg: the value of 'mon_allow_pool_delete' is true
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi PLAYBOOK_FILENAME .yml --- - name: PLAY_NAME hosts: HOSTS_OR_HOST_GROUPS become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: - name: NAME_OF_TASK ceph_orch_apply: spec: | service_type: SERVICE_TYPE service_id: UNIQUE_NAME_OF_SERVICE placement: host_pattern: ' HOST_PATTERN_TO_SELECT_HOSTS ' label: LABEL spec: SPECIFICATION_OPTIONS :
[ceph-admin@admin cephadm-ansible]USD sudo vi deploy_osd_service.yml --- - name: deploy osd service hosts: host01 become: true gather_facts: true tasks: - name: apply osd spec ceph_orch_apply: spec: | service_type: osd service_id: osd placement: host_pattern: '*' label: osd spec: data_devices: all: true
ansible-playbook -i INVENTORY_FILE _PLAYBOOK_FILENAME .yml
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts deploy_osd_service.yml
[ceph-admin@admin ~]USD cd /usr/share/cephadm-ansible
sudo vi PLAYBOOK_FILENAME .yml --- - name: PLAY_NAME hosts: ADMIN_HOST become: USE_ELEVATED_PRIVILEGES gather_facts: GATHER_FACTS_ABOUT_REMOTE_HOSTS tasks: - name: NAME_OF_TASK ceph_orch_daemon: state: STATE_OF_SERVICE daemon_id: DAEMON_ID daemon_type: TYPE_OF_SERVICE
[ceph-admin@admin cephadm-ansible]USD sudo vi restart_services.yml --- - name: start and stop services hosts: host01 become: true gather_facts: false tasks: - name: start osd.0 ceph_orch_daemon: state: started daemon_id: 0 daemon_type: osd - name: stop mon.host02 ceph_orch_daemon: state: stopped daemon_id: host02 daemon_type: mon
ansible-playbook -i INVENTORY_FILE _PLAYBOOK_FILENAME .yml
[ceph-admin@admin cephadm-ansible]USD ansible-playbook -i hosts restart_services.yml