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?
A container exits when its main process exits. Doing something like:
docker run -itd debian
to hold the container open is frankly a hack that should only be used for quick tests and examples. If you just want a container for testing for a few minutes, I would do:
docker run -d debian sleep 300
Which has the advantage that the container will automatically exit if you forget about it. Alternatively, you could put something like this in a while loop to keep it running forever, or just run an application such as top. All of these should be easy to do in Kubernetes.
The real question is why would you want to do this? Your container should be providing a service, whose process will keep the container running in the background.