i'm trying to start up tomcat on my docker desktop,and i followed the official tomcat tutorial on docker hub.but somehow i found that docker will create a new container everytime after running the command:docker run -it --rm tomcat and delete the container automatically when tomcat shuts down.

i have already known the reason is that run --rm can automatically remove the container when it exits.

now i finally built webs on tomcat,and i don't want them to be vanished. how can i save my container before it's deleted?

thx! ;D

CodePudding user response：

Based on what I've found on the internet, remove the --rm flag is not possible currently. docker update gives you the ability to update some parameters after you start your container, but you cannot update the cleanup flag (--rm) according to the document.

References:

I started a docker container with --rm Is there an easy way to keep it, without redoing everything?

Cancel --rm option on running docker container

But some workaround can be applied. You can export your current container to an image, act as a checkpoint, then you can start a new container without the --rm flag, and based on the image you exported. You can use docker commit to do so:

docker commit [your container name/id] [repo/name:tag]

(Use docker ps to list your containers, do it in a new bash/cmd/PowerShell session, or you will lose your work when you exit your docker container)

Then start a new container without the --rm flag:

docker run -it [repo/name:tag]