Managing Ceph daemon states

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 IBM Storage Ceph 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
```
 [ansible@admin ~]$ cd /usr/share/cephadm-ansible
```

Create a playbook with daemon state changes:

Syntax

 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

Example

 [ansible@admin cephadm-ansible]$ 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

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

 ansible-playbook -i INVENTORY_FILE PLAYBOOK_FILENAME.yml

Example

 [ansible@admin cephadm-ansible]$ ansible-playbook -i hosts restart_services.yml

Verification

Review the output from the playbook tasks.