Post start hook

Detach deleted loop devices from previous worker instances.
It should be done when the worker stops but it's not.
Space isn't released, leading the node space to fill up quickly.
This will always happen upon a worker crash or forcing a pod to terminate

Signed-off-by: David Rozé <[email protected]>

Author: david-baylibre

templates/worker-configmap.yaml

@@ -8,6 +8,10 @@ metadata:
     release: "{{ .Release.Name }}"
     heritage: "{{ .Release.Service }}"
 data:
+  post-start-hook.sh: |
+    #!/bin/bash
+    losetup -d $(losetup -a | grep "volumes\.img (deleted)" | cut -d: -f1)
+    exit 0
   pre-stop-hook.sh: |
     #!/bin/bash
     while true; do

templates/worker-deployment.yaml

@@ -81,6 +81,11 @@ spec:
 {{ toYaml .Values.worker.readinessProbe | indent 12 }}
 {{- end }}
           lifecycle:
+            postStart:
+              exec:
+                command:
+                  - "/bin/bash"
+                  - "/post-start-hook.sh"
             preStop:
               exec:
                 command:
@@ -107,6 +112,9 @@ spec:
             - name: concourse-keys
               mountPath: {{ .Values.worker.keySecretsPath | quote }}
               readOnly: true
+            - name: concourse-worker
+              mountPath: /post-start-hook.sh
+              subPath: post-start-hook.sh
             - name: concourse-worker
               mountPath: /pre-stop-hook.sh
               subPath: pre-stop-hook.sh