garbd installation - Arbitrator for Galera

Johan

January 03, 2013 21:05

This article describes how to install garbd.

You should not have an even number of nodes in the Galera cluster, this can lead to split-brain/network partitioning, see more below.

To protect from split-brain, you can install gardb, an arbitrator for Galera.

To install garbd on the server "192.168.56.101" do from the UI: Manage -> Load Balancer -> Select Garbd.

Enter the IP address as shown in the picture below and click the "Install Garbd" button.

Read more about network partitioning here: http://johanandersson.blogspot.se/2012/09/garbd-how-to-avoid-network-partitioning.html

Comments

18 comments

Graham Green

May 30, 2013 23:38
Upon following the instructions above I get the following:

# ./s9s_galera --install-garbd -i 1 -h localhost
load opts 1
No vendor was specified
./s9s-galera --install-garbd -V [percona|mariadb|codership]
So I added the vendor parameter using one of the options given and get the following:

# ./s9s_galera --install-garbd -i 1 -h localhost -V mariadb
load opts 1
Not a supported vendor
0

Comment actions Permalink
Johan

May 31, 2013 06:20
Hi,

The mariadb was indeed missing.

Please do:

cd s9s-admin

git pull

cd cluster

./s9s_galera --install-garbd -i 1 -h <ip address> -V mariadb

Please don't use "localhost" or "127.0.0.1", use instead the actual ip or hostname (hostname must not resolve to 127.0.0.1) of the server where you want to install haproxy.

Best regards

Johan
0

Comment actions Permalink
Graham Green

May 31, 2013 18:42
Thanks Johan

I tried what you suggested, I now get new errors. I have created a ticket for these new problems.
0

Comment actions Permalink
tom

July 11, 2013 08:32
Hello,

i try install garbd, but got this error:

./s9s_galera --install-garbd -i 1 -h 10.1.0.105
load opts 1
Hostname: 10.1.0.105
Donor: 10.1.0.102
Galera port: 4567
Cluster name: my_wsrep_cluster
10.1.0.105: Executing 'mkdir -p /root/s9s_tmp/'Ok: 10.1.0.105: Executed mkdir -p /root/s9s_tmp/
[ok]
s9s_galera --install-garbd -f <galera package missing>
0

Comment actions Permalink
Johan

July 11, 2013 08:54
Hi,

Yes we changed this:

s9s_galera --install-garbd -i <clusterid> -h<hostname> -f<path to galera package>

Path to galera package can be:

/var/www/html/cmon/upload/galera-23.2.4-1.rhel6.x86_64.rpm

or
/var/www/html/cmon/upload/galera-23.2.4-amd64.deb

The galera package is also in you deployment folder.

E.g, in s9s-galera-codership-2.4.0/mysql/repo/galera..

Best regards

Johan
0

Comment actions Permalink
Johan

July 11, 2013 09:00
Updated article to reflect the last issue.
0

Comment actions Permalink
Yuriy Rodak

July 16, 2013 19:25
Hello,

CentOS release 6.4, Percona-XtraDB-Cluster-galera-2.6-1.152.rhel6.x86_64

# touch /etc/cmon.cnf

# ./s9s_galera --install-garbd -i 1 192.168.36.27
s9s_galera --install-garbd -p missing

Could you please describe what is cmon and how I can install garbd in my case. Let me know if garbd is a part of extended support package,

Thanks.
0

Comment actions Permalink
Yuriy Rodak

July 17, 2013 05:29
my apologies for stupid question. garbd already installed with base package:
# rpm -qf /usr/bin/garbd
Percona-XtraDB-Cluster-galera-2.6-1.152.rhel6.x86_64My apolo
0

Comment actions Permalink
Rich Bos

August 21, 2013 10:16
Hi, could I just ask if this is meant to be run on a clean system? I'm presuming not as when I run the following -

./s9s_galera --install-garbd -i 1 -h<hostname>

I get the following error -

Could not find /etc/cmon.cnf

I have added the repos and installed the percona-xtradb-cluster-galera-2.x package but am presuming that's not enough?

Any advice appreciated.

Many thanks,

RichB
0

Comment actions Permalink
Johan

August 21, 2013 10:22
Hi,

You need a cluster installed with ClusterControl in order to benefit from the Severalnines s9s* tool chain.

If you have an existing cluster, and install ClusterControl with s9s_bootstrap --install , then you are able to use the s9s* tools.

Best regards

Johan
0

Comment actions Permalink
Rich Bos

August 21, 2013 10:25
Hi Johan, yes, we have a x3 node cluster installed with s9s CC (4 instances in total), I was trying to run this on a 5th instance so I could remove one of the nodes and run some tests.

So I'm guessing I run this from the CC? Which then becomes the arbitrator?
0

Comment actions Permalink
Johan

August 21, 2013 10:28
Hi,

Correct, you run this from the Controller node:

./s9s_galera --install-garbd -i 1 -h<hostname>

Which will then install garbd on <hostname>

Make sure you can ssh to <hostname> w/o passwords.

Best regards

Johan
0

Comment actions Permalink
Rich Bos

August 21, 2013 10:35
Thank you Johan, that makes sense yes. We have installed OK now and the Garbd node is showing up fine in the CC. Great...!

Many thanks.

RichB
0

Comment actions Permalink
Viktor B.

May 21, 2015 14:42
Should Garbd node be installed on one host only?

On which hosts should this be installed? Cloudcontrol node or all of the cluster nodes?

Thank you
0

Comment actions Permalink
Johan

May 21, 2015 19:16
Hi Viktor, you can install it on the Controller node.

Installing on the cluster nodes would defeat its purpose.

BR
johan
0

Comment actions Permalink
Viktor B.

May 21, 2015 20:06
Thank you for clarification.
0

Comment actions Permalink
hos7ein

May 26, 2015 07:55
hi

tnx for this post

i install 3+1 galeraa Mysql cluster.now for installation gardb, I shoulde be install on 3 node mysql ?
0

Comment actions Permalink
Johan

May 26, 2015 08:30
Hi,

See the previous comments:

Install it on the controller node, installing it on the mysql nodes defeats the purpose.

BR
johan
0

Comment actions Permalink

Please sign in to leave a comment.

Comments

Didn't find what you were looking for?