I have an image from base os centos/systemd.when i give "exec /usr/sbin/init" in the laucher file of the container and creating the container using docker systemd services are up. But when i create a container using the same image in kubernetes with the same launcher file systemd services are not comming up.How to run the /usr/sbin/init in the kubernetes so the systemd services comes up during the container creation
To solve this issue you can use kubernetes init container which run first before the main container creation and start the necessary services.
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
initContainers:
- name: check-system-ready
image: busybox
command: ['sh', '-c', 'Your sysntax for systemd']
containers:
- your container spec
Sharing here official kubernetes init container doc : https://kubernetes.io/docs/concepts/workloads/pods/init-containers/
https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-initialization/