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[mod] utils/lxc.sh: detect conflict of docker & LXC in the iptables

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Docker is blocking network of existing LXC containers / there is a conflict in
the iptables setup of Docker & LXC.  With this patch:

- utils/lxc.sh checks internet connectivity (instead of silently hang)
- Chapter "Internet Connectivity & Docker" describes the problem and made a
  suggestion for a solution a solution

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This commit is contained in:
Markus Heiser 2021-06-23 12:39:49 +02:00
parent 056550d523
commit c8a6548592
3 changed files with 76 additions and 3 deletions
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53
docs/utils/lxc.sh.rst
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@ -40,8 +40,14 @@ take some time**::
A cup of coffee later, your LXC suite is build up and you can run whatever task
you want / in a selected or even in all :ref:`LXC suite containers <lxc.sh
help>`. If you do not want to build all containers, **you can build just
one**::
help>`.
.. hint::
If you see any problems with the internet connectivity of your
containers read section :ref:`internet connectivity docker`.
If you do not want to build all containers, **you can build just one**::
$ sudo -H ./utils/lxc.sh build searx-ubu1804
@ -66,6 +72,49 @@ If there comes the time you want to **get rid off all** the containers and
$ sudo -H ./utils/lxc.sh remove
$ sudo -H ./utils/lxc.sh remove images
.. _internet connectivity docker:
Internet Connectivity & Docker
==============================
.. sidebar:: further read
- `Docker blocking network of existing LXC containers <https://github.com/docker/for-linux/issues/103>`__
- `Docker and IPtables (fralef.me) <https://fralef.me/docker-and-iptables.html>`__
- `Docker and iptables (docker.com) <https://docs.docker.com/network/iptables/#docker-on-a-router/>`__
There is a conflict in the ``iptables`` setup of Docker & LXC. If you have
docker installed, you may find that the internet connectivity of your LXD
containers no longer work.
Whenever docker is started (reboot) it sets the iptables policy for the
``FORWARD`` chain to ``DROP`` `[ref]
<https://docs.docker.com/network/iptables/#docker-on-a-router>`__::
$ sudo -H iptables-save | grep FORWARD
:FORWARD ACCEPT [7048:7851230]
:FORWARD DROP [7048:7851230]
A handy solution of this problem might be to reset the policy for the
``FORWARD`` chain after the network has been initialized. For this create a
file in the ``if-up`` section of the network (``/etc/network/if-up.d/iptable``)
and insert the following lines::
#!/bin/sh
iptables -F FORWARD
iptables -P FORWARD ACCEPT
Don't forget to set the execution bit::
sudo chmod ugo+x /etc/network/if-up.d/iptable
Reboot your system and check the iptables rules::
$ sudo -H iptables-save | grep FORWARD
:FORWARD ACCEPT [7048:7851230]
:FORWARD ACCEPT [7048:7851230]
.. _lxc.sh install suite:
Install suite