Fedora 43
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Podman : Use by common users2025/11/12
 

It's possible to use Podman containers by common users.

[1] By default, sub UID/GID that are used on user name spaces are assigned to run containers.
# default name spaces number

[root@dlp ~]#
cat /proc/sys/user/max_user_namespaces

63740
# 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.
[fedora@dlp ~]$
podman pull fedora

[fedora@dlp ~]$
podman images 

REPOSITORY                         TAG         IMAGE ID      CREATED     SIZE
registry.fedoraproject.org/fedora  latest      a9005aba99b1  2 days ago  186 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 200
-rw-r--r--. 1 fedora fedora 122880 Nov 12 09:48 db.sql
-rw-r--r--. 1 fedora fedora      8 Nov 12 09:48 defaultNetworkBackend
drwx------. 2 fedora fedora      6 Nov 12 09:48 libpod
drwx------. 2 fedora fedora     27 Nov 12 09:48 networks
drwx------. 5 fedora fedora    185 Nov 12 09:48 overlay
drwx------. 3 fedora fedora    124 Nov 12 09:48 overlay-containers
drwx------. 3 fedora fedora    116 Nov 12 09:48 overlay-images
drwx------. 2 fedora fedora    129 Nov 12 09:48 overlay-layers
-rw-r--r--. 1 fedora fedora     64 Nov 12 09:48 storage.lock
-rw-r--r--. 1 fedora fedora      0 Nov 12 09:48 userns.lock
drwx------. 2 fedora fedora      6 Nov 12 09:48 volumes
# 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
7b11fdef27ce  test-pod    Created     3 seconds ago  88d86c1d5146  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 -itd -p 1023:80 fedora /bin/bash

Error: pasta failed with exit code 1:
Failed to bind port 1023 (Permission denied) for option '-t 1023-1023:80-80', exiting
[fedora@dlp ~]$
podman run -itd -p 1024:80 fedora /bin/bash

[fedora@dlp ~]$
podman ps 

CONTAINER ID  IMAGE                                     COMMAND     CREATED       STATUS        PORTS                 NAMES
2445abe9d58b  registry.fedoraproject.org/fedora:latest  /bin/bash   1 second ago  Up 2 seconds  0.0.0.0:1024->80/tcp  compassionate_borg
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