<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 3 Jun 2022 at 14:10, Norrie, Andrew <<a href="mailto:Andrew.Norrie@cgg.com">Andrew.Norrie@cgg.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">We are currently planning some large OpenStack deployments utilizing kolla-ansible and<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">I’m curious what folks are doing with the cell database HA/redundancy.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">With kolla-ansible (xena) it appears that a loadbalancer setup is only allowed for the<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">default database shard (shard 0)... reference:
<a href="https://docs.openstack.org/kolla-ansible/latest/reference/databases/mariadb-guide.html" target="_blank">
https://docs.openstack.org/kolla-ansible/latest/reference/databases/mariadb-guide.html</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">If we are setting up separate cell database shards with Galera, I’m wondering if there is a convenient work-around or configuration for implementation of HA for these cell databases.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">In the inventory group_vars directory you can specify the group variables (for each cell database) as:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">nova_cell_database_address:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">nova_cell_database_group:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">but these aren’t virtual IP hosts/addresses (non default db shard). This works perfectly fine with<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">a single server cell database but not Galera. If that db server goes down the cell instance information is lost.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u> </span></p></div></div></blockquote><div><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Hi Andrew,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">You are correct - only the first shard is load balanced. The sharding feature was actually just the first patch in a series intended to support proxysql. I believe this would add the functionality you are looking for. In fact, the proposed test case for proxysql in our CI is a multi-cell deployment.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Here is the patch series:</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><a href="https://review.opendev.org/q/topic:proxysql">https://review.opendev.org/q/topic:proxysql</a><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Unfortunately it has been stuck for a while, largely due to core reviewer bandwidth. The author is Michael Arbet, who is often on IRC as kevko. I'd suggest registering your interest in these patches via gerrit, and at one of the weekly kolla IRC meetings (this week is cancelled due to the summit). If you have time available, then testing and providing reviews could help to get the patches moving.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">In the meantime, you can configure HAProxy to load balance additional services, by placing an HAProxy config snippet in /etc/kolla/config/haproxy/services.d/*.cfg.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Regards,</div><div class="gmail_default" style="font-family:verdana,sans-serif">Mark</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="gmail-m_5172819118185529451WordSection1"><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)"><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(49,132,155)">Many thanks ... Andrew<u></u><u></u></span></p>
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