openstack: adjust default PDB minAvailable

With current default setup we only spinup a single replica for each of
the components, then we apply PDB that requires this single replica to
always be available which renders the nodes the components are running
on unmaintainable.

This commit lowers the number of required available replicas to 0 with
the intention that users will override this with a more appropriate
values when scaling up the number of replicas in the deploy
configuration.

components/glance/aio-values.yaml

@@ -68,7 +68,9 @@ pod:
   lifecycle:
     disruption_budget:
       api:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.api - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
   resources:
     enabled: true
   probes:

components/horizon/aio-values.yaml

@@ -51,6 +51,14 @@ manifests:
   secret_db: false
   service_ingress: false
 
+pod:
+  lifecycle:
+    disruption_budget:
+      horizon:
+        # this should be set to no more than (pod.replicas.horizon - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
+
 # We don't want to enable OpenStack Helm's
 # helm.sh/hooks because they set them as
 # post-install,post-upgrade which in ArgoCD

components/ironic/aio-values.yaml

@@ -185,7 +185,9 @@ pod:
   lifecycle:
     disruption_budget:
       api:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.api - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
 
 # we don't want to enable OpenStack Helm's
 # helm.sh/hooks because they set them as

components/keystone/aio-values.yaml

@@ -229,7 +229,9 @@ pod:
   lifecycle:
     disruption_budget:
       api:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.api - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
 
 conf:
   keystone:

components/neutron/aio-values.yaml

@@ -66,7 +66,9 @@ pod:
   lifecycle:
     disruption_budget:
       server:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.server - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
   mounts:
     neutron_server:
       neutron_server:

components/nova/aio-values.yaml

@@ -133,7 +133,9 @@ pod:
   lifecycle:
     disruption_budget:
       osapi:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.osapi - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
 
 manifests:
   job_db_init: false

components/placement/aio-values.yaml

@@ -27,7 +27,9 @@ pod:
   lifecycle:
     disruption_budget:
       api:
-        min_available: 1
+        # this should be set to no more than (pod.replicas.api - 1)
+        # usually set on per-deployment basis.
+        min_available: 0
 
 manifests:
   job_db_init: false