1podman-unshare(1) General Commands Manual podman-unshare(1)
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6 podman-unshare - Run a command inside of a modified user namespace
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10 podman unshare [options] [command]
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14 Launches a process (by default, $SHELL) in a new user namespace. The
15 user namespace is configured so that the invoking user's UID and pri‐
16 mary GID appear to be UID 0 and GID 0, respectively. Any ranges which
17 match that user and group in /etc/subuid and /etc/subgid are also
18 mapped in as themselves with the help of the newuidmap(1) and
19 newgidmap(1) helpers.
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22 podman unshare is useful for troubleshooting unprivileged operations
23 and for manually clearing storage and other data related to images and
24 containers.
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27 It is also useful to use the podman mount command. If an unprivileged
28 user wants to mount and work with a container, then they need to exe‐
29 cute podman unshare. Executing podman mount fails for unprivileged
30 users unless the user is running inside a podman unshare session.
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33 The unshare session defines two environment variables:
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36 • CONTAINERS_GRAPHROOT: the path to the persistent container's
37 data.
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39 • CONTAINERS_RUNROOT: the path to the volatile container's data.
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43 IMPORTANT: This command is not available with the remote Podman client.
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47 --help, -h
48 Print usage statement
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51 --rootless-netns
52 Join the rootless network namespace used for netavark networking. It
53 can be used to connect to a rootless container via IP address (bridge
54 networking). This is otherwise not possible from the host network name‐
55 space.
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59 The exit code from podman unshare gives information about why the con‐
60 tainer failed to run or why it exited. When podman unshare commands
61 exit with a non-zero code, the exit codes follow the chroot standard,
62 see below:
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65 125 The error is with podman itself
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68 $ podman unshare --foo; echo $?
69 Error: unknown flag: --foo
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74 126 Executing a contained command and the command cannot be invoked
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77 $ podman unshare /etc; echo $?
78 Error: fork/exec /etc: permission denied
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83 127 Executing a contained command and the command cannot be found
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86 $ podman unshare foo; echo $?
87 Error: fork/exec /usr/bin/bogus: no such file or directory
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92 Exit code contained command exit code
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95 $ podman unshare /bin/sh -c 'exit 3'; echo $?
96 3
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101 $ podman unshare id
102 uid=0(root) gid=0(root) groups=0(root),65534(nobody)
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104 $ podman unshare cat /proc/self/uid_map /proc/self/gid_map
105 0 1000 1
106 1 10000 65536
107 0 1000 1
108 1 10000 65536
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110 $ podman unshare --rootless-netns ip addr
111 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
112 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
113 inet 127.0.0.1/8 scope host lo
114 valid_lft forever preferred_lft forever
115 inet6 ::1/128 scope host
116 valid_lft forever preferred_lft forever
117 2: tap0: <BROADCAST,UP,LOWER_UP> mtu 65520 qdisc fq_codel state UNKNOWN group default qlen 1000
118 link/ether aa:8c:0b:73:98:f6 brd ff:ff:ff:ff:ff:ff
119 inet 10.0.2.100/24 brd 10.0.2.255 scope global tap0
120 valid_lft forever preferred_lft forever
121 inet6 fd00::a88c:bff:fe73:98f6/64 scope global dynamic mngtmpaddr
122 valid_lft 86389sec preferred_lft 14389sec
123 inet6 fe80::a88c:bff:fe73:98f6/64 scope link
124 valid_lft forever preferred_lft forever
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129 podman(1), podman-mount(1), namespaces(7), newuidmap(1), newgidmap(1),
130 user_namespaces(7)
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134 podman-unshare(1)