Comment 2 for bug 1818834

Reviewed: https://review.openstack.org/641316
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=b1d82e6acbc79d9db1a54d53cd178080b72d0845
Submitter: Zuul
Branch: master

commit b1d82e6acbc79d9db1a54d53cd178080b72d0845
Author: Michele Baldessari <email address hidden>
Date: Wed Mar 6 11:53:39 2019 +0100

    Workaround rhel8,0 iptables bug causing neutron_ovs_agent to restart continuously

    On rhel8 the ovs_neutron_agent container endlessly restarts with:

    2019-03-05 15:41:57.096 534226 DEBUG oslo_concurrency.lockutils [req-a004e117-dba8-42bf-81fe-abf7a9f2faab - - - - -] Lock "conntrack" released by "neutron.agent.linux.ip_conntrack.get_conntrack" :: held 0.257s inner /usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:339
    2019-03-05 15:41:57.096 534226 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-a004e117-dba8-42bf-81fe-abf7a9f2faab - - - - -] Exit code: 1; Stdin: ; Stdout: Table `raw' does not exist
    ; Stderr: Agent terminated!: neutron_lib.exceptions.ProcessExecutionError: Exit code: 1; Stdin: ; Stdout: Table `raw' does not exist
    2019-03-05 15:41:57.098 534226 INFO oslo_rootwrap.client [-] Stopping rootwrap daemon process with pid=534237

    This is due to an iptables bug listing tables that were not initialized:
    https://bugzilla.redhat.com/show_bug.cgi?id=1673609

    Let us just load the raw module by listing it so that the issue does not
    appear. Slawomir and I tested this on an environment and could confirm
    that the agent does not restart any longer:
    [root@undercloud-0 ~]# podman logs neutron_ovs_agent 2>&1|grep -i error
    [root@undercloud-0 ~]#

    We are leaving these commands running on any OS version as they are
    harmless in any case.

    Closes-Bug: #1818834

    Co-Authored-By: Slawomir Kaplonski <email address hidden>

    Change-Id: Ifddcec009ae93ad0e51abfe1425eb81c1817db55