Bug 1426718 - [RFE] Make the process of reintroducing a failed HA node more user-friendly
Summary: [RFE] Make the process of reintroducing a failed HA node more user-friendly
Alias: None
Product: Red Hat CloudForms Management Engine
Classification: Red Hat
Component: Appliance
Version: 5.7.0
Hardware: Unspecified
OS: Unspecified
Target Milestone: GA
: 5.9.0
Assignee: John Hardy
QA Contact: luke couzens
Whiteboard: HA:black
Depends On:
Blocks: 1445379 1450511
TreeView+ depends on / blocked
Reported: 2017-02-24 16:34 UTC by Nick Carboni
Modified: 2018-03-06 15:16 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1445379 1450511 (view as bug list)
Last Closed: 2018-03-06 15:16:30 UTC
Category: ---
Cloudforms Team: ---
Target Upstream Version:

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Description Nick Carboni 2017-02-24 16:34:02 UTC
Description of problem:
Right now, reintroducing a failed primary database node in an HA architecture is a painfully manual process that is prone to issues and doesn't always work properly if WAL archiving isn't configured (https://bugzilla.redhat.com/show_bug.cgi?id=1406815)

Version-Release number of selected component (if applicable):

It would be good if we offered a separate console option (or enhance the existing standby setup one) that would recreate the database on an appliance with a new base backup from the primary.

This would amount to removing the contents of the data directory and running through the same steps to configure a standby node.

This will need a big warning to say that it is a destructive operation and all the data currently stored in the local database will be lost.

After seeing the issues with pg_rewind I would rather see this as the "right" way to reintroduce a node.

Comment 5 CFME Bot 2017-04-24 20:34:24 UTC
New commit detected on ManageIQ/manageiq-gems-pending/master:

commit 63a179ea2b419007df07a0385989f8f20978ee8f
Author:     Nick Carboni <ncarboni@redhat.com>
AuthorDate: Wed Apr 19 17:43:17 2017 -0400
Commit:     Nick Carboni <ncarboni@redhat.com>
CommitDate: Mon Apr 24 15:52:53 2017 -0400

    Offer to clear the data directory for new standby servers
    This will allow seamless reintegration of failed primary
    servers after a failover.
    When this happens the user will be given the option to clear
    the existing database and re-clone the new primary into this server
    and then continue to set up a standby as before.

 .../database_replication_standby.rb                |  20 +--
 .../database_replication_standby_spec.rb           | 143 ++++++++++++++-------
 2 files changed, 112 insertions(+), 51 deletions(-)

Comment 6 Nick Carboni 2017-04-25 12:30:45 UTC
Changed the console option for standby setup to also allow re-initializing failed primary servers.

This is much simpler and less error-prone than using pg_rewind and other manual cli commands.

Comment 9 luke couzens 2017-10-12 12:03:58 UTC
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