Podman : Use by common users2023/06/21

	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

63773

# sub UID/GID mapping file
# 100000 to 165535 (100000 + 65536 - 1) UID are used for running processes in containers on [debian] user

root@dlp:~#

cat /etc/subuid

debian:100000:65536
root@dlp:~#

cat /etc/subgid

debian: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:~#

adduser bookworm

root@dlp:~#

adduser bullseye

root@dlp:~#

cat /etc/subgid /etc/subgid

debian:100000:65536
bookworm:165536:65536
bullseye:231072:65536
debian:100000:65536
bookworm:165536:65536
bullseye:231072:65536

[2]	It's possible to run [podman] by common users.

debian@dlp:~$

podman pull debian

debian@dlp:~$

podman images

REPOSITORY                TAG         IMAGE ID      CREATED     SIZE
docker.io/library/debian  latest      49081a1edb0b  8 days ago  121 MB

debian@dlp:~$

podman run debian echo "run rootless containers"

run rootless containers

# containers related files are located under the [$HOME/.local] directory

debian@dlp:~$

ll ~/.local/share/containers/storage

total 40
-rw-r--r-- 1 debian debian    8 Jun 20 19:43 defaultNetworkBackend
drwx------ 2 debian debian 4096 Jun 20 19:43 libpod
drwx------ 2 debian debian 4096 Jun 20 19:43 mounts
drwx------ 2 debian debian 4096 Jun 20 19:43 networks
-rw-r--r-- 1 debian debian   64 Jun 20 19:43 storage.lock
drwx------ 2 debian debian 4096 Jun 20 19:43 tmp
-rw-r--r-- 1 debian debian    0 Jun 20 19:43 userns.lock
drwx------ 3 debian debian 4096 Jun 20 19:43 vfs
drwx------ 3 debian debian 4096 Jun 20 19:43 vfs-containers
drwx------ 3 debian debian 4096 Jun 20 19:43 vfs-images
drwx------ 2 debian debian 4096 Jun 20 19:43 vfs-layers

# possible to create Pods

debian@dlp:~$

podman pod create -p 8081:80 -n test-pod

debian@dlp:~$

podman pod ls

POD ID        NAME        STATUS      CREATED        INFRA ID      # OF CONTAINERS
320b3c32a425  test-pod    Created     5 seconds ago  28376d9a53e7  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

debian@dlp:~$

podman run -d -p 1023:80 srv.world/debian-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

debian@dlp:~$

podman run -d -p 1024:80 srv.world/debian-nginx

debian@dlp:~$

podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED        STATUS            PORTS                 NAMES
f56f30ae7a8b  srv.world/debian-nginx:latest  /usr/sbin/nginx -...  5 seconds ago  Up 6 seconds ago  0.0.0.0:1024->80/tcp  suspicious_golick

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