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podman unshare: add --rootless-cni to join the ns

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Add a new --rootless-cni option to podman unshare to also join the
rootless-cni network namespace. This is useful if you want to connect
to a rootless container via IP address. This is only possible from the
rootless-cni namespace and not from the host namespace. This option also
helps to debug problems in the rootless-cni namespace.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
This commit is contained in:
Paul Holzinger
2021-03-29 18:57:54 +02:00
parent 0e67053b9a
commit 0a39ad196c
8 changed files with 90 additions and 22 deletions
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37
docs/source/markdown/podman-unshare.1.md
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@ -24,6 +24,19 @@ 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.
## OPTIONS
#### **\-\-help**, **-h**
Print usage statement
#### **\-\-rootless-cni**
Join the rootless network namespace used for CNI networking. It can be used to
connect to a rootless container via IP address (CNI networking). This is otherwise
not possible from the host network namespace.
_Note: Using this option with more than one unshare session can have unexpected results._
## EXAMPLE
```
@ -35,6 +48,30 @@ $ podman unshare cat /proc/self/uid_map /proc/self/gid_map
1 10000 65536
0 1000 1
1 10000 65536
$ podman unshare --rootless-cni 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
```