[Openstack] HA Compute & Instance Evacuation
Masakari supports 4 different types of recovery methods at the time of creation of failover_segment.
1. auto: It will let nova decide on which compute host the instances should be evacuated.
2. reserved_host: You will first need to add reserved hosts to the failover segments. Masakari engine will select the first available reserved host from the failover segment, enable compute service in nova and then use that reserved host to evacuate the instances from the failed compute host.
3. auto_priority: it will first try to evacuate instances using 'auto' recovery method, if it's fails then it attempts to evacuate using "reserved_host" recovery method.
4. rh_priority: It's opposite of above "auto_priority" recovery method. it will first try to evacuate instances using 'reserved_host' recovery method, if it's fails then it attempts to evacuate using "auto" recovery method.
In your case you will need to use "auto" recovery method.
Please refer to the below documentation links for more details.
Masakari system architecture:
To install masakari-monitors with pacemaker/corosync:
Other ways to reach us: Masakari weekly meeting on #openstack-meeting IRC channel on every Tuesday at 0400 UTC or else you can post your queries on #openstack-masakari IRC channel.
From: Torin Woltjer <torin.woltjer at granddial.com>
Sent: Saturday, May 5, 2018 3:43:05 AM
To: jpetrini at coredial.com
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] HA Compute & Instance Evacuation
Thank you very much for the information. Just for clarification, when you say reserved hosts, do you mean that I must keep unloaded virtualization hosts in reserve? Or can Masakari move instances from a downed host to an already loaded host that has open capacity?
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