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MySQL MHA and Perl pathing

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I am certainly not a knowledgeable Perl person, however I recently ran into the error Can’t locate MHA/MasterMonitor.pm on Red Hat 6.x. I have installed MySQL MHA on various systems before without any issues.

$ masterha_manager -version
Can't locate MHA/MasterMonitor.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/bin/masterha_manager line 26.
BEGIN failed--compilation aborted at /usr/bin/masterha_manager line 26.

The issue was that MySQL MHA is not installed in any of the acceptable default paths for this disto default installation.

$ find / -type d -name MHA
/usr/lib/perl5/vendor_perl/MHA

The fix was simple on this OS, but I expect there is a correct Perl approach?

ln -s /usr/lib/perl5/vendor_perl/MHA /usr/lib64/perl5/vendor_perl/

$ cat /etc/*release
Red Hat Enterprise Linux Server release 6.3 (Santiago)
Red Hat Enterprise Linux Server release 6.3 (Santiago)

Installing MySQL MHA with Percona Server

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MySQL MHA by Oracle ACE Director Yoshinori Matsunobu is an excellent open source tool to help in providing HA with native MySQL replication. The installation however is dependent on some Perl packages and to the untrained eye this may be an issue if you are using Percona Server as your choice of MySQL implementation.

The MHA Node page requires the perl-DBD-MySQL package to be installed. The installation on RedHat/CentOS/Oracle Linux look like this:

$ sudo yum install perl-DBD-MySQL
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.anl.gov
* extras: mirror.anl.gov
* updates: mirror.anl.gov
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package perl-DBD-MySQL.x86_64 0:3.0007-2.el5 set to be updated
--> Finished Dependency Resolution

However, recently with a client the following error “mysql conflicts with Percona-Server” occurred.

$ sudo yum install perl-DBD-MySQL
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.anl.gov
* extras: mirror.anl.gov
* updates: mirror.anl.gov
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package perl-DBD-MySQL.x86_64 0:3.0007-2.el5 set to be updated
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15)(64bit) for package: perl-DBD-MySQL
--> Processing Dependency: libmysqlclient.so.15()(64bit) for package: perl-DBD-MySQL
--> Running transaction check
---> Package mysql.x86_64 0:5.0.95-1.el5_7.1 set to be updated
--> Processing Conflict: mysql conflicts MySQL
--> Finished Dependency Resolution
mysql-5.0.95-1.el5_7.1.x86_64 from updates has depsolving problems
 --> mysql conflicts with Percona-Server-client-55
Error: mysql conflicts with Percona-Server-client-55

This is actually an easy problem to solve, but if you are unfamiliar with all the various MySQL packages for RPM’s, and you installed Percona Server with the standard documented commands you may get lost. What is necessary is the installation of the compatibility libraries, as simple as:

$ sudo yum install -y Percona-Server-shared-compat

Installing Perl RRD module – RRDs.pm

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Perform a quick check if the module is available.

$ perl -MRRDs -le 'print q(ok!)'
Can't locate RRDs.pm in @INC (@INC contains: /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.7/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.6/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.5/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl/5.8.6 /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.7/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.6/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.5/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .).
BEGIN failed--compilation aborted.

Check the installed packages on this CentOS 5 server.

$ rpm -qa | grep rrd
rrdtool-1.2.27-3.el5
rrdtool-1.2.27-3.el5

Do a search for related rrdtool modules.

$ sudo yum search rrdtool
Loading "fastestmirror" plugin
Loading mirror speeds from cached hostfile
 * epel: ftp.SURFnet.nl
 * base: mirrors.service.softlayer.com
 * updates: mirrors.service.softlayer.com
 * addons: mirrors.service.softlayer.com
 * extras: mirrors.service.softlayer.com
Excluding Packages in global exclude list
Finished
rrdtool.i386 : Round Robin Database Tool to store and display time-series data
queuegraph.noarch : A RRDtool frontend for Mail statistics
rrdtool-perl.x86_64 : Perl RRDtool bindings
rrdtool-tcl.x86_64 : Tcl RRDtool bindings
mailgraph-selinux.noarch : A RRDtool frontend for Mail statistics
collectd-rrdtool.x86_64 : RRDTool module for collectd
rrdtool.i386 : Round Robin Database Tool to store and display time-series data
munin.noarch : Network-wide graphing framework (grapher/gatherer)
rrdtool.x86_64 : Round Robin Database Tool to store and display time-series data
ruby-RRDtool.x86_64 : RRDTool for Ruby
munin-node.noarch : Network-wide graphing framework (node)
rrdtool-ruby.x86_64 : Ruby RRDtool bindings
sagator.noarch : Antivir/antispam gateway for smtp server
rrdtool-php.x86_64 : PHP RRDtool bindings
rrdtool-devel.x86_64 : RRDtool libraries and header files
rrdtool-python.x86_64 : Python RRDtool bindings
ganglia-gmetad.x86_64 : Ganglia Metadata collection daemon
rrdtool-doc.x86_64 : RRDtool documentation
cacti.noarch : An rrd based graphing tool
queuegraph-selinux.noarch : A RRDtool frontend for Mail statistics
rrdtool-devel.i386 : RRDtool libraries and header files
cacti.noarch : An rrd based graphing tool
sysusage.noarch : System monitoring based on perl, rrdtool, and sysstat
mailgraph.noarch : A RRDtool frontend for Mail statistics
rrdtool.x86_64 : Round Robin Database Tool to store and display time-series data

Install what looks like the right module.

$ sudo yum install rrdtool-perl
Loading "fastestmirror" plugin
Loading mirror speeds from cached hostfile
 * epel: mirrors.ircam.fr
 * base: mirrors.service.softlayer.com
 * updates: mirrors.service.softlayer.com
 * addons: mirrors.service.softlayer.com
 * extras: mirrors.service.softlayer.com
Excluding Packages in global exclude list
Finished
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package rrdtool-perl.x86_64 0:1.2.27-3.el5 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 rrdtool-perl            x86_64     1.2.27-3.el5     epel               34 k

Transaction Summary
=============================================================================
Install      1 Package(s)
Update       0 Package(s)
Remove       0 Package(s)

Total download size: 34 k
Downloading Packages:
(1/1): rrdtool-perl-1.2.2 100% |=========================|  34 kB    00:00
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing: rrdtool-perl                 ######################### [1/1]

Installed: rrdtool-perl.x86_64 0:1.2.27-3.el5
Complete!

Test shows it should now be available.

$ perl -MRRDs -le 'print q(ok!)'
ok!