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How can I get the IP address of an LXC container in a format I can use in scripting?

Right now, the command lxc info <container> report that information, but in a human readable format, with a lot of information.

I would like to ONLY to GET the IP address given a container name.

Note: I HAVE to duplicate this question because Linux Containers have changed a lot.

Installing lxd and using unprivileged containers is the default way to go this days (2017) and I think the solutions posted on the original question are do not resolve the issue in this case.

In any case, I installed the package lxc1 to get access to the command lxc-info, but that command doesn't recognize any of my unprivileged containers.

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A native solution (which isn't any prettier than @siloko's answer) would be 

lxc list "<name>" -c 4 | awk '!/IPV4/{ if ( $2 != "" ) print $2}'

There are alternatives to awk, but that's tangential to the question.

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  • Works well for multiple IP addresses – Adam Ryczkowski Feb 24 '20 at 10:29
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So far this is the easiest way:

lxc list -c4 --format csv <container> | cut -d' ' -f1

But maybe it will be possible without cut.

EDIT: Uncut bash:

a=( $(lxc list -c4 --format csv u1) ) ip4=$a[1] echo $ip4

Hint from @monstermunchkin from the above issue.

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lxc list | grep nameofthecontainer | egrep -o "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+"

This is what I am using, I pass the container name in as a variable.

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  • 2
    the grep command is unneded, you can put directly lxc list container_name | egrep -o "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+" with the same result – Yonsy Solis Feb 20 '18 at 15:45
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pylxd is the official python API client interface developed, supported, and endorsed by the LXD project.

Installation instructions here

$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
>>> from pylxd import Client
>>> client = Client()
>>> for p in client.containers.all(): print(p.name, p.state().network['eth0']['addresses'][0]['address'])
... 
stretch-cc 10.76.67.242
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Probably a bit ugly but:

lxc-info -n my-container | grep IP: | tr -d ' ' | cut -f2 -d:

will get you just the IP address

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  • Thank you. It would be a solution in the near time. BTW, the idea is to use the command lxc info, not lxc-info as they are different how I explained. – jgomo3 Jun 1 '17 at 14:58
  • bare lxc is not available on my system (Ubuntu 16.04), sorry. – slowko Jun 2 '17 at 6:55
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These use a single grep.

For IPv4:

lxc info container-name |grep -Po '\seth\d:\sinet\s+\K[0-9\.]+'

For IPv6 (will probably list multiple IPs):

lxc info container-name |grep -Po '\seth\d:\sinet6\s+\K[0-9a-f:]+'
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lxc-info --name container --ips --no-humanize

prints the container IP addresses.

The returned value is a list because a container can have more than one address.

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