update: support upgrading a subset of nodes

It can be useful in a large cluster deployment to split the upgrade and
only upgrade a group of nodes at a time.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2014304

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/rolling_update.yml

@@ -14,6 +14,7 @@
 
 - name: confirm whether user really meant to upgrade the cluster
   hosts: localhost
+  tags: always
   become: false
   gather_facts: false
   vars:
@@ -47,7 +48,6 @@
 
 
 - name: gather facts and check the init system
-
   hosts:
     - "{{ mon_group_name|default('mons') }}"
     - "{{ osd_group_name|default('osds') }}"
@@ -59,7 +59,7 @@
     - "{{ client_group_name|default('clients') }}"
     - "{{ iscsi_gw_group_name|default('iscsigws') }}"
     - "{{ monitoring_group_name|default('monitoring') }}"
-
+  tags: always
   any_errors_fatal: True
   become: True
   gather_facts: False
@@ -136,6 +136,7 @@
         rolling_update: true
 
 - name: upgrade ceph mon cluster
+  tags: mons
   vars:
     health_mon_check_retries: 5
     health_mon_check_delay: 15
@@ -314,6 +315,7 @@
 
 - name: reset mon_host
   hosts: "{{ mon_group_name|default('mons') }}"
+  tags: always
   become: True
   gather_facts: false
   tasks:
@@ -331,6 +333,7 @@
     health_mon_check_delay: 15
     upgrade_ceph_packages: True
   hosts: "{{ mon_group_name|default('mons') }}"
+  tags: mgrs
   serial: 1
   become: True
   gather_facts: false
@@ -366,6 +369,7 @@
     upgrade_ceph_packages: True
     ceph_release: "{{ ceph_stable_release }}"
   hosts: "{{ mgr_group_name|default('mgrs') }}"
+  tags: mgrs
   serial: 1
   become: True
   gather_facts: false
@@ -401,6 +405,7 @@
 
 - name: set osd flags
   hosts: "{{ mon_group_name | default('mons') }}[0]"
+  tags: osds
   become: True
   gather_facts: false
   tasks:
@@ -462,8 +467,8 @@
     health_osd_check_retries: 40
     health_osd_check_delay: 30
     upgrade_ceph_packages: True
-
   hosts: "{{ osd_group_name|default('osds') }}"
+  tags: osds
   serial: 1
   become: True
   gather_facts: false
@@ -539,6 +544,7 @@
 
 - name: complete osd upgrade
   hosts: "{{ mon_group_name|default('mons') }}[0]"
+  tags: osds
   become: True
   gather_facts: false
   tasks:
@@ -580,6 +586,7 @@
 
 - name: upgrade ceph mdss cluster, deactivate all rank > 0
   hosts: "{{ mon_group_name | default('mons') }}[0]"
+  tags: mdss
   become: true
   gather_facts: false
   tasks:
@@ -681,6 +688,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: active_mdss
+  tags: mdss
   become: true
   gather_facts: false
   tasks:
@@ -727,6 +735,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: standby_mdss
+  tags: mdss
   become: True
   gather_facts: false
 
@@ -775,6 +784,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: "{{ rgw_group_name|default('rgws') }}"
+  tags: rgws
   serial: 1
   become: True
   gather_facts: false
@@ -819,6 +829,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: "{{ rbdmirror_group_name|default('rbdmirrors') }}"
+  tags: rbdmirrors
   serial: 1
   become: True
   gather_facts: false
@@ -852,6 +863,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: "{{ nfs_group_name|default('nfss') }}"
+  tags: nfss
   serial: 1
   become: True
   gather_facts: false
@@ -900,8 +912,8 @@
 - name: upgrade ceph iscsi gateway node
   vars:
     upgrade_ceph_packages: True
-  hosts:
+  hosts: "{{ iscsi_gw_group_name|default('iscsigws') }}"
-    - "{{ iscsi_gw_group_name|default('iscsigws') }}"
+  tags: iscsigws
   serial: 1
   become: True
   gather_facts: false
@@ -943,6 +955,7 @@
   vars:
     upgrade_ceph_packages: True
   hosts: "{{ client_group_name|default('clients') }}"
+  tags: clients
   serial: "{{ client_update_batch | default(20) }}"
   become: True
   gather_facts: false
@@ -974,6 +987,9 @@
     - "{{ rgw_group_name | default('rgws') }}"
     - "{{ rbdmirror_group_name | default('rbdmirrors') }}"
     - "{{ mgr_group_name | default('mgrs') }}"
+  tags:
+    - post_upgrade
+    - crash
   gather_facts: false
   become: true
   tasks:
@@ -1001,6 +1017,7 @@
 
 - name: complete upgrade
   hosts: "{{ mon_group_name | default('mons') }}"
+  tags: post_upgrade
   become: True
   gather_facts: false
   tasks:
@@ -1037,6 +1054,7 @@
     - "{{ nfs_group_name|default('nfss') }}"
     - "{{ iscsi_gw_group_name|default('iscsigws') }}"
     - "{{ monitoring_group_name|default('monitoring') }}"
+  tags: monitoring
   gather_facts: false
   become: true
   tasks:
@@ -1067,6 +1085,7 @@
 
 - name: upgrade monitoring node
   hosts: "{{ monitoring_group_name }}"
+  tags: monitoring
   gather_facts: false
   become: true
   tasks:
@@ -1098,6 +1117,7 @@
 
 - name: upgrade ceph dashboard
   hosts: "{{ groups[mgr_group_name] | default(groups[mon_group_name]) | default(omit) }}"
+  tags: monitoring
   gather_facts: false
   become: true
   tasks:
@@ -1117,6 +1137,7 @@
 
 - name: switch any existing crush buckets to straw2
   hosts: "{{ mon_group_name | default('mons') }}[0]"
+  tags: post_upgrade
   become: true
   any_errors_fatal: true
   gather_facts: false
@@ -1158,6 +1179,7 @@
 
 - name: show ceph status
   hosts: "{{ mon_group_name|default('mons') }}"
+  tags: always
   become: True
   gather_facts: false
   tasks: