How to run command after initialization

Question

I would like to run specific command after initialization of deployment is successful.

This is my yaml file:

apiVersion: extensions/v1beta1 kind: Deployment metadata:   name: auth spec:   replicas: 1   template:     metadata:         labels:           app: auth     spec:       containers:         - name: auth           image: {{my-service-image}}           env:           - name: NODE_ENV             value: "docker-dev"           resources:             requests:               cpu: 100m               memory: 100Mi           ports:             - containerPort: 3000 

However, I would like to run command for db migration after (not before) deployment is successfully initialized and pods are running.

I can do it manually for every pod (with kubectl exec), but this is not very scalable.

Answer 1

I resolved it using lifecycles:

apiVersion: extensions/v1beta1 kind: Deployment metadata:   name: auth spec:   replicas: 1   template:     metadata:         labels:           app: auth     spec:       containers:         - name: auth           image: {{my-service-image}}           env:           - name: NODE_ENV             value: "docker-dev"           resources:             requests:               cpu: 100m               memory: 100Mi           ports:             - containerPort: 3000           lifecycle:             postStart:               exec:                 command: ["/bin/sh", "-c", {{cmd}}]