Instructions for using the --rm option of docker run

When the Docker container exits, the file system inside the default container is still retained to facilitate debugging and preserve user data.

However, for the foreground container, since it only runs for a short period of time during the development and debugging process, there is no need to retain its user data. Therefore, you can set the --rm option when starting the container, so that the file system inside the container can be automatically cleaned up when the container exits.

Here is an example:

docker run --rm ba-208

Equivalent to

docker run --rm=true ba-208

Obviously, the --rm option cannot be used together with the -d option (or it does not make sense to use them together), that is, it can only automatically clean up the foreground container, not the detached container.

Note that the --rm option will also clean up the container's anonymous data volumes.

Therefore, executing the docker run command with the --rm command option is equivalent to executing docker rm -v after the container exits.

Additional knowledge: Use the docker run --cap-add parameter to solve permission issues (unable to use gdb debugging, unable to use date -s to modify time)

Problem: Cannot use gdb debugging on centos in docker container

ptrace: Operation not permitted

Solution reference: Click to enter

Add the parameter --cap-add=SYS_PTRACE to the docker run command

docker run --cap-add=SYS_PTRACE ......

For more caps, see the manual

http://man7.org/linux/man-pages/man7/capabilities.7.html

There is also a less elegant approach that is not recommended: solve it with –privileged –privileged is equivalent to –cap-add=ALL.

A similar problem is that date -s cannot be used to modify the time on the docker machine

Solution:

docker run --cap-add=SYS_TIME --cap-add=SYS_PTRACE ...

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