The has this to say about it: Giving non-root access The docker daemon always runs as the root user, and since Docker version 0.5.2, the docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root, and so, by default, you can access it with sudo. Starting in version 0.5.3, if you (or your Docker installer) create a Unix group called docker and add users to it, then the docker daemon will make the ownership of the Unix socket read/writable by the docker group when the daemon starts. The docker daemon must always run as the root user, but if you run the docker client as a user in the docker group then you don't need to add sudo to all the client commands. As of 0.9.0, you can specify that a group other than docker should own the Unix socket with the -G option. Warning: The docker group (or the group specified with -G) is root-equivalent; see and this blogpost on (thanks michael-n). Important to read: (it also links to ). Manage Docker as a non-root user The docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can only access it using sudo. The docker daemon always runs as the root user. If you don’t want to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group. • Add the docker group if it doesn't already exist: sudo groupadd docker • Add the connected user '$USER' to the docker group. Free scary horror games download. Change the user name to match your preferred user if you do not want to use your current user: sudo gpasswd -a $USER docker • Either do a newgrp docker or log out/in to activate the changes to groups. • You can use docker run hello-world to check if you can run docker without sudo. If you use docker login, you may find that the.docker folder created in your home folder, belongs to root. Thus you would encounter this warning when running docker commands: WARNING: Error loading config file:/home/myuser/.docker/config.json - stat /home/myuser/.docker/config.json: permission denied. I made my user's.docker folder accessible without sudo like so: sudo chgrp -hR docker ~/.docker && sudo chown -R myuser ~/.docker. The chgrp didn't seem to help though, so probably I should only recommend the chown step. – Jul 28 '17 at 11:24. The mechanism by which adding a user to group docker grants permission to run docker is to get access to the socket of docker at /var/run/docker.sock. If the filesystem that contains /var/run has been mounted with ACLs enabled, this can also be achieved via ACLs. Sudo setfacl -m user:username:rw /var/run/docker.sock I'm only including this for completeness. In general, I recommend to avoid ACLs whenever a good alternative based on groups is available: It is better if the privileges in a system can be understood by looking at group memberships only. Having to scan the file system for ACL entries in order to understand system privileges is an additional burden for security audits. Warning 1: This has the same root equivalence as adding username to the docker group. You can still start a container in a way that has root access to the host filesystem. Warning 2: ACLs are significantly more difficult for security audits than group-based security. Probably avoid ACLs if possible when you can use groups instead, at least in audit-relevant environments. I'm running Ubuntu xenia in my docker container (this is a container running in my OS X VM Host). When you run the docker run command that created my container, it logs you in as root. So when I try to install Linuxbrew after all this and after installing curl and ruby in my container via app-gret, I get the error don't run this as root! When I try to then install Linuxbrew: ruby -e '$(curl -fsSL I want to be able to sill run this somehow. If docker run logs me in as root, what are my options here to get around this limitation on root so I can still run this command? If docker always logs me in as root to a container, what do people usually do in the situations where they want to install stuff like this as a non-root user on a container with Ubuntu? If your Dockerfile uses only CMD, the provided command will be run if no arguments are. A docker container running as root has full control of the host system. I'm running Ubuntu xenia in my docker container (this is a container running in my OS X VM Host). When you run the docker run command that created my container, it logs you in as root. Note: I'm new to both Ubuntu, Linux, and docker. So that implies I may not be aware of all basics and there is a lot to know. A Google search lead me to. I personally don't think it's a nice and clean solution, but it should be able to do the job. What this solution does is the following: Instead of directly starting the program in the container, there is a two-step launch going on: First, a small script is launched with docker, which basically creates a new user in the container, and then executes the main program as this new user.
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