Public bug reported:
Ubuntu Groovy (20.10)
kernel 5.8.0-20-generic
neutron-linuxbridge-agent: 2:17.0.0~git2020091014.215a541bd4-0ubuntu1
iptables: 1.8.5-3ubuntu1 (nf_tables)
iptables-restore points to xtables-nft-multi
After upgrading iptables from 1.8.4 to 1.8.5 and rebooting the neutron network
node, neutron-linuxbridge-agent didn't properly start anymore.
The log file shows many errors like:
2020-10-05 10:20:37.998 551 ERROR
neutron.plugins.ml2.drivers.agent._common_agent ; Stdout: ; Stderr:
iptables-restore: line 29 failed
Downgrading iptables to 1.8.4 solves the problem.
Trying to do what the linuxbridge agent does:
2020-10-05 10:20:37.998 551 ERROR
neutron.plugins.ml2.drivers.agent._common_agent *filter
2020-10-05 10:20:37.998 551 ERROR
neutron.plugins.ml2.drivers.agent._common_agent :FORWARD - [0:0]
shows that
iptables-restore <<EOF
*filter
:INPUT - [0:0]
COMMIT
EOF
works fine with iptables 1.8.4 but fails with 1.8.5
Workaround
It seems neutron-linuxbridge agent tries to create the default chains (like
INPUT) with a "-" as policy. By making sure the chains already exist (and are
shown with iptables-save) the agent doesn't try to create those default chains
and the agent starts fine.
So just running:
sudo iptables -F OUTPUT
sudo iptables -F OUTPUT -t raw
sudo ip6tables -F OUTPUT
sudo ip6tables -F OUTPUT -t raw
is enough to get neutron-linuxbridge-agent working with iptables 1.8.5.
** Affects: neutron (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "neutron-linuxbridge-agent.log"
https://bugs.launchpad.net/bugs/1898547/+attachment/5417816/+files/neutron-linuxbridge-agent.log
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https://bugs.launchpad.net/bugs/1898547
Title:
neutron-linuxbridge-agent fails to start with iptables 1.8.5
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