add config option to set container name in case multiple containers exist in dovecot-director pod

README.md

@@ -13,9 +13,10 @@ If you don't run it inside a k8s cluster it tries to load the kubeconfig in the
 If it does not exist you need to specify the absolute path with command flag "-c".
 
 Environment variables needed for successful execution:
-* `DOVECOT_DIRECTOR_LABELS`(string): All labels given to dovecot director for conclusive identification of dovecot director pods in the following format: `<LABEL1>=<VALUE1>,<LABEL2>=<VALUE2>`
-* `DOVECOT_LABELS`(string): All labels given to dovecot for conclusive identification of dovecot pods, same format as in `DOVECOT_DIRECTOR_LABELS`
 * `DOVECOT_NAMESPACE`(string): Namespace name which must contain both dovecot director and dovecot pods
+* `DOVECOT_LABELS`(string): All labels given to dovecot for conclusive identification of dovecot pods, same format as in `DOVECOT_DIRECTOR_LABELS`
+* `DOVECOT_DIRECTOR_LABELS`(string): All labels given to dovecot director for conclusive identification of dovecot director pods in the following format: `<LABEL1>=<VALUE1>,<LABEL2>=<VALUE2>`
+* `DOVECOT_DIRECTOR_CONTAINER_NAME` (string) (optional): Container Name of dovecot-director in Pod. Defaults to first Container in Pod if not set.
 
 ### Used Library
 https://github.com/kubernetes/client-go

cmd/main.go

@@ -22,6 +22,8 @@ import (
 // variables: namespace, labels
 var dovecotLabels string
 var dovecotDirectorLabels string
+var dovecotDirectorContainerName string
+
 
 var namespace string
 var kubeconf *rest.Config
@@ -38,6 +40,8 @@ func main() {
 		panic(err.Error())
 	}
 	dovecotDirectorLabels = os.Getenv("DOVECOT_DIRECTOR_LABELS")
+	dovecotDirectorContainerName = os.Getenv("DOVECOT_DIRECTOR_CONTAINER_NAME")
+
 	dovecotLabels = os.Getenv("DOVECOT_LABELS")
 	namespace = os.Getenv("DOVECOT_NAMESPACE")
 
@@ -68,6 +72,7 @@ func ExecuteCommand(command string, podname string, namespace string, clientset
 	req := clientset.CoreV1().RESTClient().Post().Resource("pods").Name(podname).Namespace(namespace).SubResource("exec")
 	// THE FOLLOWING EXPECTS THE POD TO HAVE ONLY ONE CONTAINER IN WHICH THE COMMAND IS GOING TO BE EXECUTED
 	option := &v1.PodExecOptions{
+		Container: dovecotDirectorContainerName,
 		Command: cmd,
 		Stdin:   false,
 		Stdout:  true,

docker/docker-compose.yaml

@@ -8,6 +8,7 @@ services:
     volumes:
       - ~/.kube/.config:/root/.kube/config
     environment:
-      - DOVECOT_DIRECTOR_LABELS=app.kubernetes.io/instance=test,app.kubernetes.io/name=dovecot-director
-      - DOVECOT_LABELS=app.kubernetes.io/instance=test,app.kubernetes.io/name=dovecot
       - DOVECOT_NAMESPACE=mail
+      - DOVECOT_LABELS=app.kubernetes.io/instance=test,app.kubernetes.io/name=dovecot
+      - DOVECOT_DIRECTOR_LABELS=app.kubernetes.io/instance=test,app.kubernetes.io/name=dovecot-director
+      - DOVECOT_DIRECTOR_CONTAINER_NAME=dovecot-director