pcs-modules-2

Ansible modules for configuring pacemaker cluster on CentOS/RHEL 6/7/8 and Fedora 31/32/33/34/35 systems.

PCS versions supported:

pcs-0.9
pcs-0.10
pcs-0.11 (initial support)

If you are looking for a role that will configure a basic pacemaker cluster on CentOS/RHEL 6/7/8 or Fedora 31/32/33/34/35 systems, then check out the ondrejhome.ha-cluster-pacemaker role that uses the pcs-modules-2.

Note that modules manipulating with cluster configuration such as pcs_resource, pcs_constraint_*, pcs_property, pcs_resource_defaults and pcs_stonith_level should be run only from one of the cluster nodes in cluster by using either run_once: True or delegate_to: options.

Requirements

RHEL: It is expected that machines will already be registered and subscribed for access to 'High Availability' or 'Resilient storage' channels.

Role Variables

None. This role is intended to be included as dependency.

Provided Modules

pcs_auth - (de)authorization of nodes in pacemaker cluster

pcs_resource - create/update/delete cluster resources in pacemaker cluster including stonith resources

pcs_constraint_location - create/delete cluster location constraints in pacemaker cluster

pcs_constraint_colocation - create/delete cluster colocation constraints in pacemaker cluster

pcs_constraint_order - create/delete cluster order constraints in pacemaker cluster

pcs_cluster - create/destroy pacemaker cluster, adds/removes nodes to/from existing clusters

pcs_property - set/unset pacemaker cluster properties

pcs_resource_defaults - set/unset resource defaults and resource operation defaults

pcs_quorum_qdevice - crete/delete qdevice in pacemaker cluster

pcs_stonith_level - crete/delete stonith levels in pacemaker cluster

detect_pacemaker_cluster - fact collecting module for collecting various information about pacemaker cluster (currently only the nodes cluster considers to be part of)

Example Playbook

Example playbook for including modules in your playbook

- hosts: servers
  roles:
     - { role: ondrejhome.pcs-modules-2 }

Use the ansible-doc command to get more information about each module and to see examples of its use.

ansible-doc -M library/ pcs_resource

Known issues and limitations

RRP on EL7 is limited to 2 links and following message can be observed if more than 2 links are attempted. pcs_cluster module will consider only 2 links and ignore rest of specified silently to avoid this issue. If you have platform with pcs-0.9 where you can create cluster with 3 or more redundant links (using pcs) then feel free to open issue and provide details.
```
  [MAIN  ] parse error in config: interface ring number 2 is bigger than allowed maximum 1
```