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sap_ha_pacemaker_cluster: Allow to append manual cluster config to the generated config #922

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sap_ha_pacemaker_cluster: Allow to append manual cluster config to the generated config #922

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18 changes: 17 additions & 1 deletion roles/sap_ha_pacemaker_cluster/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ It is recommended to execute this role together with other roles in this collect

#### SAP Netweaver cluster
1. [sap_general_preconfigure](https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_general_preconfigure)
2. [sap_netweaver_preconfigure](https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_netweaver_preconfigure)
2. [sap_netweaver_preconfigure](https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_netweaver_preconfigure)
3. [sap_install_media_detect](https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_install_media_detect)
4. [sap_swpm](https://github.com/sap-linuxlab/community.sap_install/tree/main/roles/sap_swpm)
5. *`sap_ha_pacemaker_cluster`*
Expand Down Expand Up @@ -1167,4 +1167,20 @@ Name of the NetWeaver SCS resource group.<br>

Name of the Virtual IP resource for NetWeaver Central Services (SCS).<br>

### sap_ha_pacemaker_cluster_constraints_colocation_append <br>sap_ha_cluster_constraints_location_append <br>sap_ha_pacemaker_cluster_constraints_order_append <br>sap_ha_cluster_resource_clones_append <br>sap_ha_cluster_resource_primitives_append

- _Type:_ `list`

This role generally respects pre-defined ha_cluster* variables and tries to merge the configuration it generates with the content of the pre-defined variables. <br>
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@rob0d These sentences are bit on the nose, because it contains too many negatives as it tells me: "Hey, this role barely works"

It has to be reworked if PR is to be accepted.

However, in some cases the order of resources is important. The above variables allow to append a specific cluster configuration AFTER the configuration generated by this role. <br>

The order in which cluster configuration is generated before it's passed to `ha_cluster` role is:
1. `ha_cluster*` variables (if defined).
2. Configuration created by this role based on provided parameters.
3. The content of `sap_ha_[pacemaker|cluster]*_append` variables is appended.
<br>

NOTE: The config in the `*_append` variables is appended only if this role has created entries in the equivalent HA cluster variable e.g. `ha_cluster_constraints_colocation` during the run. If nothing has been defined by this role, there is no reason to append anything. In this case just use the appropriate `ha_cluster*` variable (step 1. above).
<br>

<!-- END Role Variables -->
10 changes: 5 additions & 5 deletions roles/sap_ha_pacemaker_cluster/tasks/construct_final_hacluster_vars.yml
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Expand Up @@ -69,17 +69,17 @@
- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_constraints_colocation'"
when: __sap_ha_pacemaker_cluster_constraints_colocation is defined
ansible.builtin.set_fact:
ha_cluster_constraints_colocation: "{{ __sap_ha_pacemaker_cluster_constraints_colocation }}"
ha_cluster_constraints_colocation: "{{ __sap_ha_pacemaker_cluster_constraints_colocation + sap_ha_pacemaker_cluster_constraints_colocation_append | d([]) }}"

- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_constraints_location'"
when: __sap_ha_pacemaker_cluster_constraints_location is defined
ansible.builtin.set_fact:
ha_cluster_constraints_location: "{{ __sap_ha_pacemaker_cluster_constraints_location }}"
ha_cluster_constraints_location: "{{ __sap_ha_pacemaker_cluster_constraints_location + sap_ha_cluster_constraints_location_append | d([]) }}"

- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_constraints_order'"
when: __sap_ha_pacemaker_cluster_constraints_order is defined
ansible.builtin.set_fact:
ha_cluster_constraints_order: "{{ __sap_ha_pacemaker_cluster_constraints_order }}"
ha_cluster_constraints_order: "{{ __sap_ha_pacemaker_cluster_constraints_order + sap_ha_pacemaker_cluster_constraints_order_append | d([]) }}"

- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_extra_packages'"
when: __sap_ha_pacemaker_cluster_extra_packages is defined
Expand All @@ -105,7 +105,7 @@
- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_resource_clones'"
when: __sap_ha_pacemaker_cluster_resource_clones is defined
ansible.builtin.set_fact:
ha_cluster_resource_clones: "{{ __sap_ha_pacemaker_cluster_resource_clones }}"
ha_cluster_resource_clones: "{{ __sap_ha_pacemaker_cluster_resource_clones + sap_ha_cluster_resource_clones_append | d([]) }}"

- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_resource_groups'"
when: __sap_ha_pacemaker_cluster_resource_groups is defined
Expand All @@ -115,7 +115,7 @@
- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_resource_primitives'"
when: __sap_ha_pacemaker_cluster_resource_primitives is defined
ansible.builtin.set_fact:
ha_cluster_resource_primitives: "{{ __sap_ha_pacemaker_cluster_resource_primitives }}"
ha_cluster_resource_primitives: "{{ __sap_ha_pacemaker_cluster_resource_primitives + sap_ha_cluster_resource_primitives_append | d([]) }}"
no_log: true # be paranoid, there could be credentials in it

- name: "SAP HA Prepare Pacemaker - (ha_cluster) Define parameter 'ha_cluster_totem'"
Expand Down
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