"docker container run" - Create Container with New Command

Q

How to Create a new Container with a New Command using the "docker container run" command?

✍: FYIcenter.com

A

If you want to create an Alpine container that starts with a new command different than the default command, you need to use the "docker container run" command with your Linux command specified.

1. Create a new container with "alpine" image and start it with "ping google.com" running in the container.

fyicenter$ docker container run --name 2nd_alpine alpine ping google.com

PING google.com (172.217.7.174): 56 data bytes
64 bytes from 172.217.7.174: seq=0 ttl=49 time=1.941 ms
64 bytes from 172.217.7.174: seq=1 ttl=49 time=1.829 ms
64 bytes from 172.217.7.174: seq=2 ttl=49 time=2.203 ms
64 bytes from 172.217.7.174: seq=3 ttl=49 time=1.741 ms
64 bytes from 172.217.7.174: seq=4 ttl=49 time=1.814 ms
64 bytes from 172.217.7.174: seq=5 ttl=49 time=1.830 ms
^C
--- google.com ping statistics ---
15 packets transmitted, 15 packets received, 0% packet loss
round-trip min/avg/max = 1.682/1.907/2.615 ms

fyicenter$

2. Check the container status.

fyicenter$ docker container list --latest

CONTAINER ID  IMAGE   COMMAND            CREATED             STATUS                    NAMES
fddc7452d4f6  alpine  "ping google.com"  About a minute ago  Exited (0) 5 seconds ago  2nd_alpine

As you can see, the new container was started with the "ping google.com" command. Its console is attached to my hosting console. That's why I can see the "ping" output.

You can press Ctrl-C to terminate the "ping" command. But that also ends the execution of the container.

But the console output of the container execution is still maintained in the container. You can fetch it with the "docker container logs" command.

⇒ "docker container run --detached" - Run Container in Background

⇐ "docker container start" - Start Alpine Container

⇑ Alpine Linux Docker Image

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