How are the --network options available in podman?

Question

I am running a virtual environment on CentOS with podman. When I used the --net option of the podman run command, I get an error.

[user@server ~]$ podman run --net slirp4netns:port_handler=slirp4netns -p 1080:80 -d --name web nginx
Error: cannot join CNI networks if running rootless: invalid argument

Is this option unavailable?
Or is there a problem with the way the options are specified?
Please tell me solution.
I used this site as a reference for the command.

This is the configuration of the server.

[user@server ~]$ cat /etc/redhat-release
CentOS Linux release 8.2.2004 (Core)
[user@server ~]$ podman -v
podman version 2.0.6

score 3 · Accepted Answer · answered Sep 07 '20 at 08:48

3

The port_handler option requires Podman >= 2.1.0, which isn't released at this moment: https://github.com/containers/podman/commit/d86bae2a01cb855d5964a2a3fbdd41afe68d62c8

You can use that option if you compile Podman from its master branch.

answered Sep 07 '20 at 08:48

Akihiro Suda

66
5

score 0 · Answer 2 · edited Jun 05 '21 at 14:51

I find this link quite helpful to see rootless communication :

I am not sure if you have seen this link before or even if it is helpful to you at this instance. But, in view of helping others out, I think the blog post quotes the following helpful statements:

Note: All podman network commands are for rootfull containers only.

Technically, the container itself does not have an IP address, because without root privileges, network device association cannot be achieved

When using Podman as a rootless user, the network is setup automatically. The container itself does not have an IP Address, because without root privileges, network association is not allowed. You will also see some other limitations.

How are the --network options available in podman?

2 Answers2