podman-unshare(1) General Commands Manual podman-unshare(1)
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 con-
tainers.
It is also useful 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 un-
less 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 netavark networking. It can
be used to connect to a rootless container via IP address (bridge net-
working). This is otherwise not possible from the host network name-
space.
Exit Codes
The exit code from podman unshare gives information about why the con-
tainer 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
Execute specified command in rootless user namespace:
$ podman unshare id
uid=0(root) gid=0(root) groups=0(root),65534(nobody)
Show user namespace mappings for rootless containers:
$ podman unshare cat /proc/self/uid_map /proc/self/gid_map
0 1000 1
1 10000 65536
0 1000 1
1 10000 65536
Show rootless netns information in user namespace for rootless contain-
ers:
$ 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 aa:8c:0b:73:98:f6 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 fd00::a88c:bff:fe73:98f6/64 scope global dynamic mngtmpaddr
valid_lft 86389sec preferred_lft 14389sec
inet6 fe80::a88c:bff:fe73:98f6/64 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)
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