Podman : Use by common users2023/11/16 |
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It's possible to use Podman 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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# sub UID/GID mapping file # 524288 to 589823 (524288 + 65536 - 1) UID are used for running processes in containers on [fedora] user [root@dlp ~]# cat /etc/subuid fedora:524288:65536 [root@dlp ~]# cat /etc/subgid fedora:524288:65536 # when added new users, sub UID/GID are also added # n=0, n++ # [start UID/GID = 524288 + (65536 * n)] # [end UID/GID = (start UID/GID) + 65536 - 1] [root@dlp ~]# useradd redhat [root@dlp ~]# useradd centos [root@dlp ~]# cat /etc/subgid /etc/subgid fedora:524288:65536 redhat:589824:65536 centos:655360:65536 fedora:524288:65536 redhat:589824:65536 centos:655360:65536 |
| [2] | It's possible to run [podman] by common users. |
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[fedora@dlp ~]$ podman pull fedora [fedora@dlp ~]$ podman images REPOSITORY TAG IMAGE ID CREATED SIZE registry.fedoraproject.org/fedora latest ec546109f822 8 days ago 183 MB
[fedora@dlp ~]$
podman run fedora echo "run rootless containers" run rootless containers # containers related files are located under the [$HOME/.local] directory [fedora@dlp ~]$ ll ~/.local/share/containers/storage total 8 -rw-r--r--. 1 fedora fedora 8 Nov 16 10:37 defaultNetworkBackend drwx------. 2 fedora fedora 27 Nov 16 10:37 libpod drwx------. 2 fedora fedora 27 Nov 16 10:37 networks drwx------. 5 fedora fedora 185 Nov 16 10:38 overlay drwx------. 3 fedora fedora 124 Nov 16 10:38 overlay-containers drwx------. 3 fedora fedora 116 Nov 16 10:37 overlay-images drwx------. 2 fedora fedora 129 Nov 16 10:38 overlay-layers -rw-r--r--. 1 fedora fedora 64 Nov 16 10:38 storage.lock -rw-r--r--. 1 fedora fedora 0 Nov 16 10:37 userns.lock # possible to create Pods [fedora@dlp ~]$ podman pod create -p 8081:80 -n test-pod [fedora@dlp ~]$ podman pod ls POD ID NAME STATUS CREATED INFRA ID # OF CONTAINERS 01daa8381df7 test-pod Created 4 seconds ago e36baec58d9b 1 # for port mapping, # it's impossible to use less than [1024] ports on Host machine by common users # possible to use over [1024] ports [fedora@dlp ~]$ podman run -d -p 1023:80 docker.io/library/nginx Error: rootlessport cannot expose privileged port 1023, you can add 'net.ipv4.ip_unprivileged_port_start=1023' to /etc/sysctl.conf (currently 1024), or choose a larger port number (>= 1024): listen tcp 0.0.0.0:1023: bind: permission denied podman run -d -p 1024:80 docker.io/library/nginx [fedora@dlp ~]$ podman ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 21b7aa578713 docker.io/library/nginx:latest nginx -g daemon o... 3 seconds ago Up 4 seconds 0.0.0.0:1024->80/tcp strange_noether |
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