Kubernetes - wait for other pod to be ready

Question

I have two applications - app1 and app2, where app1 is a config server that holds configs for app2

Answer 1

You need to use initContainers. Following is an example of how you can do in your YAML file

initContainers:
- name: wait-for-other-pod
  image: docker.some.image
  args:
  - /bin/sh
  - -c
  - >
    set -x;
    while [ $(curl -sw '%{http_code}' "http://www..com" -o /dev/null) -ne 200 ]; do
      sleep 15;
    done

I have used curl to hit the health check endpoint, you can use any other UNIX command to check if the other pod is ready.