there is lots of netns mount in the compute

[Jeffrey Zhang]

we are using

- /run:/run:shared
- /run/netns:/run/netns:shared

in neutron related service now.

In this way,
1. it is unnecessary
2. restart neutron container will generate logs of mount in system

re-produce:

1. deploy env as normal
2. init networks to trigger neutron to create namespace
3. restart neutron-l3-agent or neutron-dhcp-agent

check the number of mount point, you will found lots of netns mount is create after 3

solution:
remove /run/netns:/run/netns:shared will avoid this issue

[Eduardo Gonzalez (egonzalez90)]

Jeffrey, /run/netns:/run/netns:shared was added to fix https://bugs.launchpad.net/kolla/+bug/1616268.
Is no longer needed or we have to refine which container use /run/netns:/run/netns:shared?

[Jeffrey Zhang (jeffrey4l)]

@egonzalez90

Before bug 1616268, we are using

- /run:/run
- /run/netns:/run/netns:shared

After bug 1616268, we are using

- /run:/run:shared
- /run/netns:/run/netns:shared

After this bug, we should use

- /run:/run:shared

I guess the issue is caused by nested mount. So we should avoid to use nested mount.
When you just wanna mount netns, use

- /run/netns:/run/netns:shared

when you wanna to use netns and /run folder, use

- /run:/run:shared

[Eduardo Gonzalez (egonzalez90)]

@Jeffrey, thanks for clarification

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/454179
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=321a6e54842febcabbb1ca19f52bd40187ca75ab
Submitter: Jenkins
Branch: master

commit 321a6e54842febcabbb1ca19f52bd40187ca75ab
Author: Bertrand Lallau <email address hidden>
Date: Thu Apr 6 15:02:15 2017 +0200

    Cleanup /run/netns host directory volume mount

    "/run/:/run/:shared" is previously declare as "mounted" in container,
    hence "/run/netns/:/run/netns/:shared" directory volume mount is not
    required and must be removed.

    Related-Bug: #1683584
    Change-Id: Ia7032843c493e8a883edd2f4ec12e0fdefc823a3

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: stable/ocata
Review: https://review.openstack.org/457848

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/457848
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=e6f61d8d7df6281775114dcc6bf97ea680c158cf
Submitter: Jenkins
Branch: stable/ocata

commit e6f61d8d7df6281775114dcc6bf97ea680c158cf
Author: Bertrand Lallau <email address hidden>
Date: Thu Apr 6 15:02:15 2017 +0200

    Cleanup /run/netns host directory volume mount

    "/run/:/run/:shared" is previously declare as "mounted" in container,
    hence "/run/netns/:/run/netns/:shared" directory volume mount is not
    required and must be removed.

    Related-Bug: #1683584
    Change-Id: Ia7032843c493e8a883edd2f4ec12e0fdefc823a3
    (cherry picked from commit 321a6e54842febcabbb1ca19f52bd40187ca75ab)