How can I keep a container running on Kubernetes?

Question

I'm now trying to run a simple container with shell (/bin/bash) on a Kubernetes cluster.

I thought that there was a way to keep a container running on a Docker container by using pseudo-tty and detach option (-td option on docker run command).

For example,

$ sudo docker run -td ubuntu:latest

Is there an option like this in Kubernetes?

I've tried running a container by using a kubectl run-container command like:

kubectl run-container test_container ubuntu:latest --replicas=1

But the container exits for a few seconds (just like launching with the docker run command without options I mentioned above). And ReplicationController launches it again repeatedly.

Is there a way to keep a container running on Kubernetes like the -td options in the docker run command?

Answer 1

Containers are meant to run to completion. You need to provide your container with a task that will never finish. Something like this should work:

apiVersion: v1
kind: Pod
metadata:
  name: ubuntu
spec:
  containers:
  - name: ubuntu
    image: ubuntu:latest
    # Just spin & wait forever
    command: [ "/bin/bash", "-c", "--" ]
    args: [ "while true; do sleep 30; done;" ]