How can I keep docker container running?

Question

I want to run multiple containers automatically and create something,

but some images, such as swarm, will automatically stop after run or start.

I already try like that

docker run -d swarm

docker run -d swarm /bin/bash tail -f /dev/null

docker run -itd swarm bash -c "while true; do sleep 1; done"

but 'docker ps' show nothing, and I tried to build Dockerfile by typing:

FROM swarm
ENTRYPOINT ["echo"]

and The image does not run with error message :

docker: Error response from daemon: invalid header field value "oci runtime error: container_linux.go:247: starting container process caused \"exec: \\\"echo\\\": executable file not found in $PATH\"\n".

I can't understand this error... How can I keep swarm container running..?

(Sorry,my English is not good))

Answer 1

First of all you don't want to mix the -i and -d switches. Either you would like to run the container in interactive or detached mode. In your case in detached mode:

docker run -d swarm /bin/bash tail -f /dev/null

There are also no need to allocate a tty using the -t flag, since this only needs to be done in interactive mode.

You should have a look at the Docker run reference