I own a folder, /me/tmp to which I mount a docker volume: docker run -v /me/tmp/:/root/tmp/. However when my Docker container creates folder and files instead the directory, e.g. /root/tmp/subdir/file.txt that file is created as root, and with no write permissions for other groups or users. This means that outside the container, I can't edit or even remove this file /me/tmp/subdir/file.txt. Is there any way to change the permissions or owner of the file without root access, or any way to avoid this from the start?
Docker volume files not writable, written as root
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2 Answers
You could run docker with user mapping, so any file created with uid 0 (root in the container) is automatically mapped to another uid on the host. This is handled by two files /etc/subuid and /etc/subgid.
Read the official docs
Try running RUN chmod -R 777 /root/tmp/ or RUN chmod 777 /root/tmp/ in your dockerfile, or go into the container and type chmod -R 777 /root/tmp or chmod 777 /root/tmp as root. The -R is for recursive
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