Docker USER and named volume

To secure docker, we use a specific user instead of root. We add the following code in Dockerfile.

RUN useradd -u 2000 wwwuser
USER wwwuser

Those code create user with uid=2000.
Since host volume is mounted as root user, all files and folders is readonly for user wwwuser. If the wwwuser needs to write files to volume, we can create a named volume for it.

docker volume create --driver local --opt type=tmpfs --opt device=tmpfs  --opt o=uid=2000,gid=2000,size=2g,mode=0750 myHomeVolume

Use the following command to run container

docker run -d -v myHomeVolume:/home/wwwuser --name myapps <image>

TO backup the data, taring all files at ‘/var/lib/docker/volumes/myHomeVolume/_data’ with root.

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