IT things to remember.
If you want to create a new user within a Dockerfile for an Alpine Linux, useradd won’t work. You have to use adduser.
This command will work
adduser -h /home/userx -g groupx -S userx
Please mind to add the -S (uppercase!!). If you omit this, Alpine ask interactively for a password. Interestingly, the option --disabled-password does not work!?!?
tar xvf /opt/metricbeat.tar.gz -C /opt/metricbeat --strip-components=1
If the tar-file already contains a directory, you have to add –strip-components=1. Otherwise the directory contained in the tar files is created. Also mind that the directory used for -C has to exist beforehand.
Remove all unused images
docker images –no-trunc | grep ‚
Remove all activate containers:
docker rm $(docker ps -a -q -f status=exited) docker stop $(docker ps -a -q) docker rm $(docker ps -a -q)