We are listening to multiple mailboxes on a single pod but if this pod goes down due to some reason need the other pod that is up to listen to these mailboxes. In order to keep recieving emails.
I would like to know if it is possible to find if a pod goes down like an event and trigger a script to perform above action on the go?
Approach 1:
kubernetes life cycle handler hook
apiVersion: v1
kind: Pod
metadata:
name: lifecycle-demo
spec:
containers:
- name: lifecycle-demo-container
image: nginx
lifecycle:
postStart:
exec:
command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
preStop:
exec:
command: ["/bin/sh","-c","nginx -s quit; while killall -0 nginx; do sleep 1; done"]
https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/
Approach2:
Write a script which monitors the health of for every say x seconds, when 3 consecutive health checks fail kubernetes deletes the pod. so in your script, if 3 consecutive rest call fails for health then the pod is deleted. you can trigger your event.
Approach3:
maintain 2 replicas => problem could be two pods processing same mail. you can avoid this if you use kafka.
