42e57118c3
On a two-node system the openstack-helm chart for mariadb has issues.
If you run with a single replica then your failover times are very
long due to internal timeouts in kubernetes which prevent accessing
the backing volume on the newly-active node.
At the same time, you can't run a "garbd" pod the way we do on a full
lab configuration because there is no third node to run it on.
The only viable option we've found is to trigger something to
explicitly tell the mariadb pod on the active node to bootstrap a new
primary cluster if it loses quorum due to the other mariadb pod going
away unexpectedly.
Accordingly, this commit creates a new "dbmon" OCF script which
behaves basically as follows:
start -- return $OCF_SUCCESS
stop -- return $OCF_NOT_RUNNING
standby -- return $OCF_SUCCESS or $OCF_NOT_RUNNING depending on whether
mariadb on this node is a member of the primary cluster
active -- if mariadb on this node is not a member of the primary cluster
then tell it to bootstrap a new primary cluster. Then check
again and return $OCF_SUCCESS or $OCF_NOT_RUNNING depending on
whether mariadb on this node is a member of the primary cluster
monitor -- If mariadb on this node is a member of the primary cluster
then return $OCF_RUNNING_MASTER on the active controller and
$OCF_SUCCESS on the standby controller. If mariadb is not a
member of the primary cluster return $OCF_NOT_RUNNING.
There are a few complicating factors.
If openstack application or mariadb chart not installed then treat it
like being a member of the primary cluster.
If the mariadb pod is still initializing treat it like not being a member
of the primary cluster.
If we're in a standard lab (with garbd running on a compute node) then
don't actually tell mariadb to bootstrap a new primary cluster but just
report whether it's a member of the primary cluster or not.
Story: 2004712
Task: 30410
Change-Id: I8d91dc13cb9a9adb7f7a7a95faadad4339ddb466
Signed-off-by: Chris Friesen <chris.friesen@windriver.com>
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|---|---|---|
| doc | ||
| openstack | ||
| releasenotes | ||
| .gitignore | ||
| .gitreview | ||
| .zuul.yaml | ||
| CONTRIBUTORS.wrs | ||
| LICENSE | ||
| README.rst | ||
| centos_dev_docker_images.inc | ||
| centos_helm.inc | ||
| centos_iso_image.inc | ||
| centos_pkg_dirs | ||
| centos_pkg_dirs_containers | ||
| centos_stable_wheels.inc | ||
| test-requirements.txt | ||
| tox.ini | ||
README.rst
stx-upstream
StarlingX Upstream Packages