Docker : Use by common users2026/05/08 |
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It's possible to use Docker containers by common users. |
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| [1] | By default, sub UID/GID that are used on user name spaces are assigned to run containers. |
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root@dlp:~#
apt -y install rootlesskit root@dlp:~# ln -s /usr/bin/docker /usr/share/docker.io/contrib/docker
# sub UID/GID mapping file # 100000 to 165535 (100000 + 65536 - 1) UID are used for running processes in containers on [ubuntu] user root@dlp:~# cat /etc/subuid ubuntu:100000:65536 root@dlp:~# cat /etc/subgid ubuntu:100000:65536 # when added new users, sub UID/GID are also added # n=0, n++ # [start UID/GID = 100000 + (65536 * n)] # [end UID/GID = (start UID/GID) + 65536 - 1] root@dlp:~# useradd resolute root@dlp:~# useradd raccoon root@dlp:~# cat /etc/subgid /etc/subgid ubuntu:100000:65536 resolute:165536:65536 raccoon:231072:65536 ubuntu:100000:65536 resolute:165536:65536 raccoon:231072:65536root@dlp:~# cp /usr/share/docker.io/contrib/dockerd-rootless-setuptool.sh /usr/local/bin/
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| [2] | It's possible to run [docker] by common users. |
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# setup rootless mode by each user itself ubuntu@dlp:~$ export PATH=/usr/share/docker.io/contrib:$PATH ubuntu@dlp:~$ dockerd-rootless-setuptool.sh install --skip-iptables [INFO] Creating /home/ubuntu/.config/systemd/user/docker.service [INFO] starting systemd service docker.service + systemctl --user start docker.service + sleep 3 + systemctl --user --no-pager --full status docker.service ..... ..... [INFO] Installed docker.service successfully. [INFO] To control docker.service, run: `systemctl --user (start|stop|restart) docker.service` [INFO] To run docker.service on system startup, run: `sudo loginctl enable-linger ubuntu` [INFO] Creating CLI context "rootless" Successfully created context "rootless" [INFO] Using CLI context "rootless" Current context is now "rootless" [INFO] Make sure the following environment variable(s) are set (or add them to ~/.bashrc): export PATH=/usr/share/docker.io/contrib:$PATH [INFO] Some applications may require the following environment variable too: export DOCKER_HOST=unix:///run/user/1000/docker.sock
ubuntu@dlp:~$
ubuntu@dlp:~$ export PATH=/usr/bin:$PATH ubuntu@dlp:~$ export DOCKER_HOST=unix:///run/user/$(id -u)/docker.sock
docker pull ubuntu ubuntu@dlp:~$ docker images IMAGE ID DISK USAGE CONTENT SIZE EXTRA ubuntu:latest f3d28607ddd7 160MB 45.3MB
ubuntu@dlp:~$
docker run ubuntu echo "run rootless containers" run rootless containers # containers related files are located under the [$HOME/.local] directory ubuntu@dlp:~$ ll ~/.local/share/docker total 52 drwx--x--- 12 ubuntu ubuntu 4096 May 8 01:27 ./ drwx--x--x 3 ubuntu ubuntu 4096 May 8 01:26 ../ drwx--x--x 4 ubuntu ubuntu 4096 May 8 01:26 buildkit/ drwx------ 3 ubuntu ubuntu 4096 May 8 01:26 containerd/ drwx--x--- 3 ubuntu ubuntu 4096 May 8 01:27 containers/ -rw------- 1 ubuntu ubuntu 36 May 8 01:26 engine-id drwxr-x--- 3 ubuntu ubuntu 4096 May 8 01:26 network/ drwx------ 3 ubuntu ubuntu 4096 May 8 01:26 plugins/ drwx--x--- 3 ubuntu ubuntu 4096 May 8 01:27 rootfs/ drwx------ 2 ubuntu ubuntu 4096 May 8 01:26 runtimes/ drwx------ 2 ubuntu ubuntu 4096 May 8 01:26 swarm/ drwx------ 2 ubuntu ubuntu 4096 May 8 01:26 tmp/ drwx-----x 2 ubuntu ubuntu 4096 May 8 01:26 volumes/ # for port mapping, # it's impossible to use less than [1024] ports on Host machine by common users # possible to use over [1024] ports ubuntu@dlp:~$ docker run -dt -p 1023:80 ubuntu bash 13f86e05f53a31552a55dc97cbd09a5100f176b10f6adab4ffd0a12b6d82414d docker: Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint great_rhodes (d6f10258ff61a9616d5876a46c7c5233d982580eba5200ae029d66a156ecbb04): error while calling RootlessKit PortManager.AddPort(): cannot expose privileged port 1023, you can add 'net.ipv4.ip_unprivileged_port_start=1023' to /etc/sysctl.conf (currently 1024), or set CAP_NET_BIND_SERVICE on rootlesskit binary, or choose a larger port number (>= 1024): listen tcp4 0.0.0.0:1023: bind: permission denied Run 'docker run --help' for more informationubuntu@dlp:~$ docker run -dt -p 1024:80 ubuntu bash ubuntu@dlp:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 96c4b5218881 ubuntu "bash" 3 seconds ago Up 3 seconds 0.0.0.0:1024->80/tcp, [::]:1024->80/tcp exciting_golick |
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