![]() The user doesn't specifically need to exist in the container's /etc/passwd file. If file permissions really matter, you can specify the numeric host user ID to use when you launch the container. Ideally that's the end of the story: your code is built into your image and it stores all of its data somewhere external like a database, so it doesn't care about the host user space at all (there by default shouldn't be docker run -v or Docker Compose volumes: options). user is not in the sudoers file error list of all user groups including sudo group sudoers configuration file root login user mod add user to sudo visudo. When you describe the default way to run the container, only then switch to the non-root user. This includes installing your application. Still in your Dockerfile, do almost everything as root. RUN adduser -system -group -no-create-home appuser It does not need a password, login shell, home directory, or any other details. If you wish to give any other account full root access through sudo, simply add them to the sudo group. In your Dockerfile, create some non-root user. The typical practice I'm used to works like this: The exception is when sharing files with the host using bind mounts, but there it's better to specify this detail when you start the container. Since your containers have some isolation from the host system, you don't generally need containers to have the same user names or user IDs as the host system. ![]() You can use sudo su to switch to the superuser account. However, if you want to run a command as another user, you need to specify that with -u. You can specify a user with -u, for example sudo -u root command is the same as sudo command. RUN apt-get update & apt-get install -y some-package To run a command as the root user, use sudo command. ubuntuob76-node0: lxc launch ubuntu:22.04 c-rt -c limits.cpu2 -c security.privilegedtrue -c 99 -target ob76-node6. How to Add User to Sudoers or Sudo Group on Ubuntu Make a User an Administrator in Ubuntu - ImagineLinux VirtualBox Ubuntu 22. In the context of your question, if you've already switched to some non-root user, and you need to run some administrative command, use USER to switch back to root. sudo is also hard to script, and it's very hard to usefully maintain a user password in Docker (writing a root-equivalent password in a plain-text file that can be easily retrieved isn't a security best practice). In Docker you almost never need sudo, for three reasons: it's trivial to switch users in most contexts you don't typically get interactive shells in containers (how do I get a directory listing from inside the cron daemon?) and if you can run any docker command at all you can very easily root the whole host. (How do I add a user to my PostgreSQL server with sudo privileges? How do I add a user to my Web browser?) You can attach an Ubuntu Pro subscription to the hosts and enable the real-time kernel feature. If you ask this question about other processes, it doesn't really make sense. Finally, open a new terminal window and run a command that requires root privileges, such as sudo apt-get update.Generally you should think of a Docker container as a wrapper around a single process. ![]() It is important to add this line at the end of the file, so that the other permissions do not override this directive, since they are processed in order. If you have any sort of syntax problem, visudo will warn you and you can abort the change or open the file for editing again. The process can be completed using the usermod or gpasswd commands and testing the new user account with the sudo command. Replace username with your account username, of course. At the end of the /etc/sudoers file add this line:. ![]() You should never edit /etc/sudoers with a regular text editor, such as Vim or nano, because they do not validate the syntax like the visudo editor.
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