Remove a Ceph Monitor node

Remove a Ceph Monitor nodeΒΆ

This section describes how to remove a Ceph Monitor node from a Ceph cluster.

Note

The Ceph Monitor service is quorum-based. Therefore, keep an odd number of Ceph Monitor nodes to establish a quorum.

To remove a Ceph Monitor node:

  1. In your project repository, remove the following lines from the cluster/infra/config/init.yml file or from the pillar based on your environment:

    parameters:
      reclass:
        storage:
          node:
            ceph_mon_node04:
              name: ${_param:ceph_mon_node04_hostname}
              domain: ${_param:cluster_domain}
              classes:
              - cluster.${_param:cluster_name}.ceph.mon
              params:
                salt_master_host: ${_param:reclass_config_master}
                linux_system_codename:  ${_param:ceph_mon_system_codename}
                single_address: ${_param:ceph_mon_node04_address}
                keepalived_vip_priority: 104
    
  2. Remove the following lines from the cluster/ceph/common.yml file or from the pillar based on your environment:

    parameters:
      ceph:
        common:
          members:
            - name: ${_param:ceph_mon_node04_hostname}
              host: ${_param:ceph_mon_node04_address}
    
  3. Log in to the Jenkins web UI.

  4. Open the Ceph - remove node pipeline.

  5. Specify the following parameters:

    Parameter

    Description and values

    SALT_MASTER_CREDENTIALS

    The Salt Master credentials to use for connection, defaults to salt.

    SALT_MASTER_URL

    The Salt Master node host URL with the salt-api port, defaults to the jenkins_salt_api_url parameter. For example, http://172.18.170.27:6969.

    HOST

    Add the Salt target name of the Ceph Monitor node to remove. For example, cmn04*.

    HOST_TYPE Removed since 2019.2.13 update

    Add mon as the type of Ceph node that is going to be removed.

  6. Click Deploy.

    The Ceph - remove node pipeline workflow:

    1. Reconfigure the configuration file on all ceph:common minions.

    2. Destroy the VM.

    3. Remove the Salt Minion node ID from salt-key on the Salt Master node.

  7. Remove the following lines from the cluster/infra/kvm.yml file or from the pillar based on your environment:

    parameters:
      salt:
        control:
          cluster:
            internal:
              node:
                cmn04:
                  name: ${_param:ceph_mon_node04_hostname}
                  provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
                  image: ${_param:salt_control_xenial_image}
                  size: ceph.mon
    
  8. Remove the following lines from the cluster/ceph/init.yml file or from the pillar based on your environment:

    _param:
       ceph_mon_node04_hostname: cmn04
       ceph_mon_node04_address: 172.16.47.145
    linux:
      network:
        host:
          cmn04:
            address: ${_param:ceph_mon_node04_address}
            names:
            - ${_param:ceph_mon_node04_hostname}
            - ${_param:ceph_mon_node04_hostname}.${_param:cluster_domain}