Docker : Use by common users2018/04/15 |
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It's possible to use Docker containers by common users.
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| [1] | To assign sub UID/GIDs that are used on user name spaces to common users, users can run [Docker] commands. |
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# install Rootless package (generally it's already installed for dependency) [root@dlp ~]# yum --enablerepo=docker-ce-stable -y install docker-ce-rootless-extras
[root@dlp ~]#
echo 63175 > /proc/sys/user/max_user_namespaces [root@dlp ~]# cat /proc/sys/user/max_user_namespaces 63175 # for example, assign sub UID/GID to [cent] user [root@dlp ~]# echo "cent:100000:65536" > /etc/subuid [root@dlp ~]# echo "cent:100000:65536" > /etc/subgid [root@dlp ~]# cat /etc/subgid /etc/subgid cent:100000:65536 cent:100000:65536 |
| [2] | It's possible to run [docker] by common users. |
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# setup rootless mode by each user itself [cent@dlp ~]$ dockerd-rootless-setuptool.sh install [INFO] systemd not detected, dockerd-rootless.sh needs to be started manually: PATH=/bin:/sbin:/usr/sbin:$PATH dockerd-rootless.sh [INFO] Creating CLI context "rootless" Successfully created context "rootless" [INFO] Make sure the following environment variables are set (or add them to ~/.bashrc): # WARNING: systemd not found. You have to remove XDG_RUNTIME_DIR manually on every logout. export XDG_RUNTIME_DIR=/home/cent/.docker/run export PATH=/bin:$PATH export DOCKER_HOST=unix:///home/cent/.docker/run/docker.sock # load displayed environment variables [cent@dlp ~]$ export XDG_RUNTIME_DIR=/home/cent/.docker/run [cent@dlp ~]$ export PATH=/usr/bin:$PATH [cent@dlp ~]$ export DOCKER_HOST=unix:///home/cent/.docker/run/docker.sock
# start dockerd-rootless [cent@dlp ~]$ dockerd-rootless.sh &
docker pull centos [cent@dlp ~]$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos latest 300e315adb2f 5 months ago 209MB
[cent@dlp ~]$
docker run centos echo "run rootless containers" run rootless containers # containers related files are located under the [$HOME/.local] directory [cent@dlp ~]$ ll ~/.local/share/docker total 0 drwx--x--x. 4 cent cent 120 May 24 13:41 buildkit drwx--x--x. 3 cent cent 20 May 24 13:41 containerd drwx-----x. 4 cent cent 150 May 24 13:43 containers drwx------. 3 cent cent 17 May 24 13:41 image drwxr-x---. 3 cent cent 19 May 24 13:41 network drwx------. 4 cent cent 32 May 24 13:41 plugins drwx------. 2 cent cent 6 May 24 13:41 runtimes drwx------. 2 cent cent 6 May 24 13:41 swarm drwx------. 2 cent cent 6 May 24 13:42 tmp drwx------. 2 cent cent 6 May 24 13:41 trust drwx-----x. 3 cent cent 17 May 24 13:42 vfs drwx-----x. 2 cent cent 25 May 24 13:41 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 [cent@dlp ~]$ docker run -t -d -p 1023:80 srv.world/centos-nginx /usr/sbin/nginx -g "daemon off;" docker: Error response from daemon: driver failed programming external connectivity on endpoint thirsty_haibt (31bd9b8058f11434e0ffc33209359f35574699caf5bc27a7e9e1b90f53095351): Error starting userland proxy: error while calling 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 tcp 0.0.0.0:1023: bind: permission denied.[cent@dlp ~]$ docker run -t -d -p 1024:80 srv.world/centos-nginx /usr/sbin/nginx -g "daemon off;" [cent@dlp ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 210870d6b13a srv.world/centos-nginx "/usr/sbin/nginx -g …" 10 seconds ago Up 1 second 0.0.0.0:1024->80/tcp, :::1024->80/tcp charming_wilson |
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