Provided by: podman_4.3.1+ds1-8ubuntu1_amd64 bug

NAME

       podman-unshare - Run a command inside of a modified user namespace

SYNOPSIS

       podman unshare [options] [command]

DESCRIPTION

       Launches  a  process  (by  default, $SHELL) in a new user namespace. The user namespace is
       configured so that the invoking user's UID and primary GID appear to be UID 0 and  GID  0,
       respectively.   Any  ranges which match that user and group in /etc/subuid and /etc/subgid
       are also mapped in as themselves with  the  help  of  the  newuidmap(1)  and  newgidmap(1)
       helpers.

       podman  unshare  is  useful  for  troubleshooting unprivileged operations and for manually
       clearing storage and other data related to images and containers.

       It is also useful if you want to use the podman mount command.  If  an  unprivileged  user
       wants  to  mount  and  work  with  a  container, then they need to execute podman unshare.
       Executing podman mount fails for unprivileged users unless the user is  running  inside  a
       podman unshare session.

       The unshare session defines two environment variables:

              • CONTAINERS_GRAPHROOT: the path to the persistent container's data.

              • CONTAINERS_RUNROOT: the path to the volatile container's data.

       IMPORTANT: This command is not available with the remote Podman client.

OPTIONS

   --help, -h
       Print usage statement

   --rootless-netns
       Join  the  rootless network namespace used for CNI and netavark networking. It can be used
       to connect to a rootless container via IP address (bridge networking). This  is  otherwise
       not possible from the host network namespace.

Exit Codes

       The  exit code from podman unshare gives information about why the container failed to run
       or why it exited.  When podman unshare commands exit with a non-zero code, the exit  codes
       follow the chroot standard, see below:

       125 The error is with podman itself

              $ podman unshare --foo; echo $?
              Error: unknown flag: --foo
              125

       126 Executing a contained command and the command cannot be invoked

              $ podman unshare /etc; echo $?
              Error: fork/exec /etc: permission denied
              126

       127 Executing a contained command and the command cannot be found

              $ podman unshare foo; echo $?
              Error: fork/exec /usr/bin/bogus: no such file or directory
              127

       Exit code contained command exit code

              $ podman unshare /bin/sh -c 'exit 3'; echo $?
              3

EXAMPLE

              $ podman unshare id
              uid=0(root) gid=0(root) groups=0(root),65534(nobody)

              $ podman unshare cat /proc/self/uid_map /proc/self/gid_map
                       0       1000          1
                       1      10000      65536
                       0       1000          1
                       1      10000      65536

              $ podman unshare --rootless-netns ip addr
              1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
                  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
                  inet 127.0.0.1/8 scope host lo
                     valid_lft forever preferred_lft forever
                  inet6 ::1/128 scope host
                     valid_lft forever preferred_lft forever
              2: tap0: <BROADCAST,UP,LOWER_UP> mtu 65520 qdisc fq_codel state UNKNOWN group default qlen 1000
                  link/ether 36:0e:4a:c7:45:7e brd ff:ff:ff:ff:ff:ff
                  inet 10.0.2.100/24 brd 10.0.2.255 scope global tap0
                     valid_lft forever preferred_lft forever
                  inet6 fe80::340e:4aff:fec7:457e/64 scope link
                     valid_lft forever preferred_lft forever
              3: cni-podman2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
                  link/ether 5e:3a:71:d2:b4:3a brd ff:ff:ff:ff:ff:ff
                  inet 10.89.1.1/24 brd 10.89.1.255 scope global cni-podman2
                     valid_lft forever preferred_lft forever
                  inet6 fe80::5c3a:71ff:fed2:b43a/64 scope link
                     valid_lft forever preferred_lft forever
              4: vethd4ba3a2f@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master cni-podman2 state UP group default
                  link/ether 8a:c9:56:32:17:0c brd ff:ff:ff:ff:ff:ff link-netnsid 0
                  inet6 fe80::88c9:56ff:fe32:170c/64 scope link
                     valid_lft forever preferred_lft forever

SEE ALSO

       podman(1), podman-mount(1), namespaces(7), newuidmap(1), newgidmap(1), user_namespaces(7)

                                                                                podman-unshare(1)