The nova-cell role sets the following sysctls on compute hosts, which
require the br_netfilter kernel module to be loaded:
net.bridge.bridge-nf-call-iptables
net.bridge.bridge-nf-call-ip6tables
If it is not loaded, then we see the following errors:
Failed to reload sysctl:
sysctl: cannot stat /proc/sys/net/bridge/bridge-nf-call-iptables: No such file or directory
sysctl: cannot stat /proc/sys/net/bridge/bridge-nf-call-ip6tables: No such file or directory
Loading the br_netfilter module resolves this issue.
Typically we do not see this since installing Docker and configuring it
to manage iptables rules causes the br_netfilter module to be loaded.
There are good reasons [1] to disable Docker's iptables management
however, in which case we are likely to hit this issue.
This change loads the br_netfilter module in the nova-cell role for
compute hosts.
[1] https://bugs.launchpad.net/kolla-ansible/+bug/1849275
Co-Authored-By: Dincer Celik <hello@dincercelik.com>
Change-Id: Id52668ba8dab460ad4c33fad430fc8611e70825e
2f91be9f39