sap_ha_pacemaker_cluster: Stonith SBD enablement, stonith and repos dictionaries

[marcelmamula]

New features:

• Stonith SBD fence method added with all extra variables required for ha_cluster

• Significant changes to Stonith task file, adding lot of extra validations to avoid execution if:

  • ha_cluster variables are provided, just skip them because you cannot override precedence anyway
  • variables are empty, not required list or string where list is expected (iterable check fails to differentiate between string and list)

• New repository dictionaries:

  • __sap_ha_pacemaker_cluster_repos_dict defined inside OS vars
  • Each platform vars loads __sap_ha_pacemaker_cluster_repos from dictionary
  • Dictionary is empty for SUSE as it comes with subscription.

• New fence agent dictionaries for each platform

  • __sap_ha_pacemaker_cluster_stonith_default_dict defined in each platform vars, then selected correct entry into __sap_ha_pacemaker_cluster_stonith_default
  • This serves as baseline for future if we have different fence agents like AWS, where RHEL and SLES have different agents.
  • There is potential for future to shift these dictionaries into new OS_stonith.yml var files if need arises for different OS parameters under same agents.

• Variable sap_ha_pacemaker_cluster_aws_credentials_setup that can be enabled to store AWS credentials. It is undefined by default to use attached IAM Role/Instance Profile done by AP4S.

  • Keeping AWS Credentials together with attached IAM, results in credentials overriding IAM permissions, requiring API user inside of AWS credentials to have fencing permissions.

• Default ha_cluster definition from AP4S moved inside of vars code, to create baseline nodes for ha_cluster

  • pcs_address is required only for pcs, but it does not harm crmsh

    __sap_ha_pacemaker_cluster_ha_cluster:
    node_name: "{{ ansible_hostname }}"
    pcs_address: "{{ ansible_default_ipv4.address }}"

• Readme and argument_specs update with new variables and increased baseline version for required collections.

Tested on:

• AWS
  • SLES4SAP 15: SBD and default fencing
  • RHEL4SAP 8.6: Several tests executed, currently running SBD and default fence agent testing again.