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Bug 1451097

Summary: First galera cluster bootstrap may fail if cluster has no data
Product: Red Hat Enterprise Linux 7 Reporter: Damien Ciabrini <dciabrin>
Component: resource-agentsAssignee: Damien Ciabrini <dciabrin>
Status: CLOSED ERRATA QA Contact: Asaf Hirshberg <ahirshbe>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 7.4CC: agk, cfeist, chjones, cluster-maint, fdinitto, mbayer, mkrcmari, oalbrigt, royoung, rscarazz, tlavigne, ushkalim
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: resource-agents-3.9.5-99.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1451414 (view as bug list) Environment:
Last Closed: 2017-08-01 15:00:11 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1451414    
Attachments:
Description Flags
commit a09b17f79ef3dcde8843ee25bb52b506b6948e8e for downstream none

Description Damien Ciabrini 2017-05-15 19:07:37 UTC 
Description of problem:
The resource agent selects the first node to go into Master state
based on the biggest commit version found on each node. If case no
data were written yet into the galera cluster, the current node is
selected as a "fallback" node to bootstrap the cluster.

The way the "fallback" node is selected is wrong because every node
takes a different decision, and this can yield to several nodes 
bootstrapping their own cluster instead of all nodes forming
a single cluster. 

Version-Release number of selected component (if applicable):
resource-agents-3.9.5-82.el7_3.10.x86_64

How reproducible:
Non-deterministic

Steps to Reproduce:
1. Deploy an HA overcloud with composable HA, galera resource on 3 dedicated nodes 

Actual results:
Sometimes more than one node can be selected as the bootstrap node, causing
the deploy to fail

Expected results:
A single node should be elected as bootstrap

Additional info:
Comment 2 Raoul Scarazzini 2017-05-16 08:14:49 UTC 
Here [1] the sosreports of two different deploys failed the same way.

[1] http://file.rdu.redhat.com/~rscarazz/BZ1451097/
Comment 4 Damien Ciabrini 2017-05-16 12:56:07 UTC 
Created attachment 1279321 [details]
commit a09b17f79ef3dcde8843ee25bb52b506b6948e8e for downstream
Comment 5 Damien Ciabrini 2017-05-16 12:57:34 UTC 
One need to apply in sequence the following commits from upstream:

a09b17f79ef3dcde8843ee25bb52b506b6948e8e (downstream version attached)
1fe6d7e9aca159a04e984d693dfcc47580bf5def
0265bcebb24427f5c76cfaa58c281c3aaead7d52
Comment 6 Oyvind Albrigtsen 2017-05-16 13:28:47 UTC 
Build with patches from comment #5.
Comment 8 Damien Ciabrini 2017-05-16 13:55:11 UTC 
Instruction for testing:

1. create a 3-node pacemaker cluster

  pcs cluster setup --name foo centos1 centos2 centos3 --force
  pcs cluster start --all

2. on all nodes, start from a clean mysql database in /var/lib/mysql

  rm -rf /var/lib/mysql
  mkdir /var/lib/mysql
  chown mysql. /var/lib/mysql
  restorecon /var/lib/mysql

3. create a galera resource, don't start it yet

  pcs resource create galera galera enable_creation=true wsrep_cluster_address='gcomm://centos1,centos2,centos3' meta master-max=3 --master --disable

4. monitor the cluster after the resource is enabled

  crm_mon -RrA
  pcs resource enable galera

The last-commit attribute from all nodes will be set to -1 because no WSREP commit has been integrated yet.

With the fix, on such start condition, the 3 nodes will always chose centos3 as a bootstrap node, as expected.
Comment 10 Damien Ciabrini 2017-05-17 14:59:33 UTC 
Additional comment, if the test is being run on a OpenStack HA overcloud, one should run the additional step on all nodes:

2b. let the resource agent use the default user for polling state 

  rm /etc/sysconfig/clustercheck
Comment 11 Udi Shkalim 2017-06-07 14:52:09 UTC 
Verified on resource-agents-3.9.5-99.el7.x86_64 with steps from comment #8
Comment 12 errata-xmlrpc 2017-08-01 15:00:11 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1844