mariadb - bootstraping happens before the socket is accessible

[Michal Rostecki]

Reproduceable in kolla-mesos.

Sometimes this part of bootstrap happens before the socket to mysql is available: https://github.com/openstack/kolla/blob/master/docker/mariadb/extend_start.sh#L15-L18

There are no logs for that, because that failure is silent. However, the proof of that is inability to log in to mariadb deployed in kolla-mesos, i.e. in Ansible tasks trying to log in to MariaDB:

localhost | FAILED! => {
    "changed": false,
    "failed": true,
    "invocation": {
        "module_args": {
            "login_host": "172.28.128.81",
            "login_password": "password",
            "login_port": "3306",
            "login_user": "root",
            "variable": "sync_binlog"
        },
        "module_name": "mysql_variables"
    },
    "msg": "unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials (ERROR: 1045 Access denied for user 'root'@'operator.local' (using password: YES))"
}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/270810

[OpenStack Infra (hudson-openstack)]

Change abandoned by Michal Rostecki (<email address hidden>) on branch: master
Review: https://review.openstack.org/270810

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/276851

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/276851
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=bf6b75da3f5ac928c2ff14e5585c6b2574155381
Submitter: Jenkins
Branch: master

commit bf6b75da3f5ac928c2ff14e5585c6b2574155381
Author: SamYaple <email address hidden>
Date: Fri Feb 5 17:41:21 2016 +0000

    Make a final check to validate mysql works

    This ensures mysql works through whatever the vip is

    Change-Id: Iaeb17240b90ae2f0fef081b42d4ba140dcecd972
    Closes-Bug: #1536633