[lxc-users] How to setup a static IP in a container with LX[C|D] 2.0.0.*

[Sean McNamara]

First of all, there's no such thing as LX[C|D]. You're either using
LXC or LXD. They're different enough in their configuration and
operation that you can't ask an "either-or" question. Pick one
solution and focus on that.

I just wanted to chime in to say that I have this same question. I'm
stuck using a pre-2.0 release of LXD because it allows me to use the
"raw.lxc" config parameter to specify the IP settings for the guest.
This configuration parameter was removed at some point prior to the
2.0 RC, so I ended up editing the source code of LXD to bring it back.
I haven't found any equivalent configuration that works without using
raw.lxc.

raw.lxc: "lxc.network.ipv4=1.2.3.4/32\nlxc.network.ipv4.gateway=5.6.7.8\nlxc.network.hwaddr=00:11:22:33:44:55\nlxc.network.flags=up
    \ \nlxc.network.mtu=1500\n"
  volatile.eth0.hwaddr: 00:11:22:33:44:55
  volatile.eth0.name: eth1
devices:
  eth0:
    hwaddr: 00:11:22:33:44:55
    nictype: bridged
    parent: br0

On Ubuntu, you can then set up your bridge as follows in
/etc/network/interfaces:

auto br0
iface br0 inet static
        address 1.2.3.4
        netmask 255.255.255.0
        broadcast 5.6.7.8
        gateway 9.10.11.12
        bridge_ports eth0
        bridge_stp off


This is fine with LXD 0.24 that was built about a month before the 2.0
release candidates started hitting (and with edited source code to
un-block the raw.lxc param) but I'm afraid to upgrade to LXD 2.0
because I don't know the way forward.

It seems like support for certain basic network topologies are still
being worked out with LXD. It should be easy, well-documented and
flexible a la OpenVZ, but it's really not, as far as I have seen. The
best way to make any progress that I've found thus far is to start
learning Google Go and reading the source code.

Thanks,

Sean



On Fri, Mar 18, 2016 at 9:10 AM, Hans Deragon <hans at deragon.biz> wrote:
> Greetings,
>
> Ok, this is ridiculous and I apologize for asking help for such a simple
> task, but I fail to find the answers by myself.  I fail to find proper
> documentation to setup bridge networking and static IP.  Newbie here btw and
> setup details at the end of this email.
>
> I got the container running and with DHCP configured, it has its own IP
> which the host can address with.
>
> Obviously, I attempted to setup the static IP many times following
> instructions found on many web pages, to no vail.  For example, I followed
> instructions from https://wiki.debian.org/LXC/SimpleBridge.  But turns out
> that I am probably running a different version of LXC and that this page is
> now obsolete.
>
> I went so far to run 'strace lxc restart server2' to realize that
> /var/lib/lxc/server2/config is not read (server2 is the container).  This
> seams to be confirmed by the post at
> http://ubuntuforums.org/showthread.php?t=2275372.
>
> I found 'man lxc.container.conf'.  Seams promising.  However, I fail to find
> within the manual the path where this file should be saved!  If you write
> documentation, please always provide the path where configuration files are
> supposed to be stored.
>
> I created a profile named 'bridged' using commands, but I have not found any
> option/instruction on how to apply that profile on my existing image.  'lxc
> start server2' does not provide any option to start the container with a
> particular profile.  BTW, where are profile configuration files stored?
>
> I need clear step by step instructions, with full paths on how to set things
> up and I fail to find any on the web.  Anybody has a useful link to suggest?
>
> I have a KVM image running (server1) and it works flawlessly with a static
> IP on my bridge.  And it wasn't hard to find instructions on how to set it
> up.  But LXD/LXc is another story.
>
> The setup:
>
> Host:       Ubuntu 14.04 LTS.
> Container:  Ubuntu 14.04 LTS.
> LXD:        2.0.0~rc3-0ubuntu4~ubuntu14.04.1~ppa1
> LXC:        2.0.0~rc10-0ubuntu2~ubuntu14.04.1~ppa1
>
> Best regards and thanks in advance,
> Hans Deragon
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