Registering as CMD not working

[PeteWilliams]

I should start by saying I am new to Docker and it is most likely something I am doing wrong rather than an issue with the script!

I have systemctl start/stop working, but enabled services do not restart when the container restarts. I see from the documentation that I need to set the CMD attribute in order for this to work.

Using the code provided in the docs…

docker commit -c "CMD ['/usr/bin/systemctl']"  -m "<comment>" <container> <new-image>

…I made a commit, then ran a new container from that image. However, the container will not start. When I check the log, it shows:

{"log":"/bin/sh: 1: [/usr/bin/systemctl]: not found\n","stream":"stderr","time":"2022-04-20T19:47:44.178390159Z"}

I can confirm that /usr/bin/systemctl does exist in the original container, so I presume it should exist in the new one created from the image. Though I'm not sure how I can check this as I can't start the container.

Having run docker inspect, I can see the CMD attribute is set as follows:

            "Cmd": [
                "/bin/sh",
                "-c",
                "['/usr/bin/systemctl']"
            ],

I wonder if something has gone wrong here as it's showing '-c' as a value, when I think that should have just been a flag passed to the commit command? Though perhaps I'm barking up the wrong tree…

Any ideas what I might be doing wrong? Thanks