initContainers for gateway

Author: cccs-nik

charts/gateway/README.md

@@ -37,6 +37,21 @@ A Helm chart for Trino Gateway
     - secretRef:
         name: password-secret
   ```
+* `initContainers` - object, default: `{}`  
+
+  Additional [containers that run to completion](https://kubernetes.io/docs/concepts/workloads/pods/init-containers/) during pod initialization.
+  Example:
+  ```yaml
+  initContainers:
+    - name: wait-for-service
+      image: busybox:1.28
+      imagePullPolicy: IfNotPresent
+      command: ['sh', '-c', "until nslookup {{ .Values.serviceName }}.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done"]
+    - name: init-sleep
+      image: busybox:1.28
+      imagePullPolicy: IfNotPresent
+      command: ['sh', '-c', 'echo The worker is running! && sleep 3600']
+  ```
 * `config.serverConfig."node.environment"` - string, default: `"test"`
 * `config.serverConfig."http-server.http.port"` - int, default: `8080`
 * `config.serverConfig."http-server.http.enabled"` - bool, default: `true`

charts/gateway/templates/deployment.yaml

@@ -46,6 +46,10 @@ spec:
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}
       terminationGracePeriodSeconds: {{ .Values.terminationGracePeriodSeconds }}
+      {{- if .Values.initContainers }}
+      initContainers:
+      {{- tpl (toYaml .Values.initContainers) . | nindent 6 }}
+      {{- end }}
       containers:
         - name: {{ .Chart.Name }}
           securityContext:

charts/gateway/values.yaml

@@ -30,6 +30,24 @@ imagePullSecrets: []
 # ```
 envFrom: []
 
+# -- Additional [containers that run to
+# completion](https://kubernetes.io/docs/concepts/workloads/pods/init-containers/)
+# during pod initialization.
+# @raw
+# Example:
+# ```yaml
+# initContainers:
+#   - name: wait-for-service
+#     image: busybox:1.28
+#     imagePullPolicy: IfNotPresent
+#     command: ['sh', '-c', "until nslookup {{ .Values.serviceName }}.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done"]
+#   - name: init-sleep
+#     image: busybox:1.28
+#     imagePullPolicy: IfNotPresent
+#     command: ['sh', '-c', 'echo The worker is running! && sleep 3600']
+# ```
+initContainers: {}
+
 config:
   serverConfig:
     node.environment: test

tests/gateway/test-values.yaml

@@ -18,6 +18,12 @@ config:
   clusterStatsConfiguration:
     monitorType: INFO_API
 
+initContainers:
+  - name: wait-for-service
+    image: busybox:1.28
+    imagePullPolicy: IfNotPresent
+    command: ['sh', '-c', "until nslookup {{ .Values.serviceName }}.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done"]
+
 ingress:
   enabled: true