Docker: Store logs on a different volume outside of the container

[jonalange]

I'm pretty new to docker, so this might be the root of the problem.

When I run docker run --rm gilleslamiral/imapsync imapsync <usual imapsync arguments> the logs are created somewhere inside the container. And if I understand that correctly, they will be removed after imapsync is done, because the container is stopped.

No matter if this is true or not I would like to store the logs on a volume outside of the container.

I tried this: docker run --rm -v /var/services/homes/backup:LOG_imapsync gilleslamiral/imapsync imapsync <usual imapsync arguments> but that doesn't seem to work. Either my volume path is wrong (but I don't think so, because I can access it with the same user as I run the container with cd /var/services/homes/backup gets me exactly where I want the logs to be. So I assume that LOG_imapsync is wrong. What path should I put there so the logs get correctly stored where I want them.

When I try to use ./LOG_imapsync as stated as the correct log path, I get an error that I have to use absolute paths.

Any idea? Thanks!

[gilleslamiral]

When I run docker run --rm gilleslamiral/imapsync imapsync <usual imapsync arguments> the logs are created somewhere inside the container

Yes, in the directory /var/tmp/uid_65534/LOG_imapsync/

What path should I put there so the logs get correctly stored where I want them?

Add the option --log

Here is a working example, just tested:

mkdir /var/tmp/kk
chown nobody  /var/tmp/kk
docker run -v /var/tmp/kk:/var/tmp/uid_65534/LOG_imapsync  gilleslamiral/imapsync imapsync --log --testslive
ls -l  /var/tmp/kk/*
/var/tmp/kk/2024_04_18_12_26_11_447_test1_test2.txt

Another solution, no volume needed, just a classical Unix redirection:

docker run  gilleslamiral/imapsync imapsync --testslive | tee /tmp/imapsync_log.txt
cat /tmp/imapsync_log.txt