keepalived 1.3.5 crashed in neutron-l3-agent when enabled router ha

[Jeffrey Zhang]

env:
centos 7.4 + kolla ocata image

centos 7.4 ship keepalived 1.3.5, which will raise segment fault when ip_vs module can not be loaded. keepalived related bug[0], and fix[1][2]

in ocata, neutron-l3-agent do not mount /lib/modules which case it load ip_vs failed and trigger this bug.

since pike, neutron-l3-agent mount /lib/modules, so it works as expect.

So we only need fix this issue on Ocata branch

[0] https://github.com/acassen/keepalived/issues/558
[1] https://github.com/acassen/keepalived/commit/dac727e1a7b676b38795d29909fb0658ed13fe17

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ocata
Review: https://review.openstack.org/510834

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/510834
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=5c42eee20925504e42764075449575c6040e3e74
Submitter: Jenkins
Branch: stable/ocata

commit 5c42eee20925504e42764075449575c6040e3e74
Author: Jeffrey Zhang <email address hidden>
Date: Tue Oct 10 18:49:33 2017 +0800

    Mount /lib/modules folder for neutron-l3-agent

    CentOS 7.4 ships keepalived 1.3.5, which raises segment fault if it can
    not load ip_vs module. This is a keepalived bug and 1.3.6 fixed this
    issue. Mount /lib/modules for neutron-l3-agent to avoid this issue.

    Since this folder is mounted since Pike branch, so this bug only affacts
    Ocata branch.

    Change-Id: I0b1392284de54df3d4d7477c3b513529c809b9fe
    Closes-Bug: #1722505

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 4.0.3 release.