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https://github.com/containers/podman.git
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3ff47748de
rootlessNetNS.Cleanup() has an issue with how it detects if cleanup is needed, reading the container state is not good ebough because containers are first stopped and than cleanup will be called. So at one time two containers could wait for cleanup but the second one will fail because the first one triggered already the cleanup thus making rootless netns unavailable for the second container resulting in an teardown error. Instead of checking the container state we need to check the netns state. Secondly, podman unshare --rootless-netns should not do the cleanup. This causes more issues than it is worth fixing. Users also might want to use this to setup the namespace in a special way. If unshare also cleans this up right away we cannot do this. [NO NEW TESTS NEEDED] Fixes #12459 Signed-off-by: Paul Holzinger <pholzing@redhat.com>
108 lines
4.0 KiB
Markdown
108 lines
4.0 KiB
Markdown
% podman-unshare(1)
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## NAME
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podman\-unshare - Run a command inside of a modified user namespace
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## SYNOPSIS
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**podman unshare** [*--*] [*command*]
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## DESCRIPTION
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Launches a process (by default, *$SHELL*) in a new user namespace. The user
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namespace is configured so that the invoking user's UID and primary GID appear
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to be UID 0 and GID 0, respectively. Any ranges which match that user and
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group in `/etc/subuid` and `/etc/subgid` are also mapped in as themselves with the
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help of the *newuidmap(1)* and *newgidmap(1)* helpers.
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**podman unshare** is useful for troubleshooting unprivileged operations and for
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manually clearing storage and other data related to images and containers.
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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
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**podman unshare**. Executing **podman mount** fails for unprivileged users unless the user is running inside a **podman unshare** session.
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The unshare session defines two environment variables:
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- **CONTAINERS_GRAPHROOT**: the path to the persistent container's data.
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- **CONTAINERS_RUNROOT**: the path to the volatile container's data.
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## OPTIONS
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#### **--help**, **-h**
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Print usage statement
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#### **--rootless-netns**
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Join the rootless network namespace used for CNI and netavark networking. It can be used to
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connect to a rootless container via IP address (bridge networking). This is otherwise
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not possible from the host network namespace.
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## Exit Codes
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The exit code from `podman unshare` gives information about why the container
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failed to run or why it exited. When `podman unshare` commands exit with a non-zero code,
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the exit codes follow the `chroot` standard, see below:
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**125** The error is with podman **_itself_**
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$ podman unshare --foo; echo $?
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Error: unknown flag: --foo
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125
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**126** Executing a _contained command_ and the _command_ cannot be invoked
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$ podman unshare /etc; echo $?
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Error: fork/exec /etc: permission denied
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126
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**127** Executing a _contained command_ and the _command_ cannot be found
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$ podman unshare foo; echo $?
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Error: fork/exec /usr/bin/bogus: no such file or directory
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127
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**Exit code** _contained command_ exit code
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$ podman unshare /bin/sh -c 'exit 3'; echo $?
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3
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## EXAMPLE
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```
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$ podman unshare id
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uid=0(root) gid=0(root) groups=0(root),65534(nobody)
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$ podman unshare cat /proc/self/uid_map /proc/self/gid_map
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0 1000 1
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1 10000 65536
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0 1000 1
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1 10000 65536
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$ podman unshare --rootless-netns ip addr
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1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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inet 127.0.0.1/8 scope host lo
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valid_lft forever preferred_lft forever
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inet6 ::1/128 scope host
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valid_lft forever preferred_lft forever
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2: tap0: <BROADCAST,UP,LOWER_UP> mtu 65520 qdisc fq_codel state UNKNOWN group default qlen 1000
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link/ether 36:0e:4a:c7:45:7e brd ff:ff:ff:ff:ff:ff
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inet 10.0.2.100/24 brd 10.0.2.255 scope global tap0
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valid_lft forever preferred_lft forever
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inet6 fe80::340e:4aff:fec7:457e/64 scope link
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valid_lft forever preferred_lft forever
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3: cni-podman2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
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link/ether 5e:3a:71:d2:b4:3a brd ff:ff:ff:ff:ff:ff
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inet 10.89.1.1/24 brd 10.89.1.255 scope global cni-podman2
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valid_lft forever preferred_lft forever
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inet6 fe80::5c3a:71ff:fed2:b43a/64 scope link
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valid_lft forever preferred_lft forever
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4: vethd4ba3a2f@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master cni-podman2 state UP group default
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link/ether 8a:c9:56:32:17:0c brd ff:ff:ff:ff:ff:ff link-netnsid 0
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inet6 fe80::88c9:56ff:fe32:170c/64 scope link
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valid_lft forever preferred_lft forever
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```
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## SEE ALSO
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**[podman(1)](podman.1.md)**, **[podman-mount(1)](podman-mount.1.md)**, **namespaces(7)**, **newuidmap(1)**, **newgidmap(1)**, **user\_namespaces(7)**
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