matrix-synapse: Add deployment strategy configuration for pods

charts/matrix-synapse/templates/deployment.yaml

@@ -16,6 +16,8 @@ metadata:
     app.kubernetes.io/component: synapse
 spec:
   replicas: 1
+  strategy:
+    {{- toYaml .Values.synapse.strategy | nindent 4 }}
   selector:
     matchLabels:
       {{- include "matrix-synapse.selectorLabels" . | nindent 6 }}

charts/matrix-synapse/templates/worker-deployment.yaml

@@ -13,6 +13,10 @@ metadata:
     app.kubernetes.io/component: {{ $name }}
 spec:
   replicas: {{ $config.replicaCount | default $default.replicaCount }}
+  {{- with ($config.strategy | default $default.strategy) }}
+  strategy:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
   selector:
     matchLabels:
       {{- include "matrix-synapse.selectorLabels" $ | nindent 6 }}

charts/matrix-synapse/values.yaml

@@ -145,6 +145,15 @@ extraSecrets: {}
 ## Configuration to apply to the main Synapse pod.
 ##
 synapse:
+  ## Only really applicable when the deployment has an RWO PV attached (e.g. when media repository
+  ## is enabled for the main Synapse pod)
+  ## Since replicas = 1, an update can get "stuck", as the previous pod remains attached to the
+  ## PV, and the "incoming" pod can never start. Changing the strategy to "Recreate" will
+  ## terminate the single previous pod, so that the new, incoming pod can attach to the PV
+  ##
+  strategy:
+    type: RollingUpdate
+
   ## Annotations to apply to the main Synapse pod.
   ##
   annotations: {}
@@ -260,6 +269,14 @@ workers:
     ##
     replicaCount: 1
 
+    ## Update strategy - only really applicable for deployments with RWO PVs attached (e.g. media repository)
+    ## If replicas = 1, an update can get "stuck", as the previous pod remains attached to the
+    ## PV, and the "incoming" pod can never start. Changing the strategy to "Recreate" will
+    ## terminate the single previous pod, so that the new, incoming pod can attach to the PV
+    ##
+    strategy:
+      type: RollingUpdate
+
     ## A specific name for this worker, can't be set globally.
     ## Note that this can only be set when replicaCount is 1
     #name: