Environment:
servers: demoenv-trial-1 demoenv-trial-2 demoenv-trial-3

1. Install Percona Server, on all servers:
$ sudo yum install http://www.percona.com/downloads/percona-release/percona-release-0.0-1.x86_64.rpm
$ sudo yum install http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ sudo yum install Percona-Server-shared-compat
$ sudo yum install Percona-Server-server-55 Percona-Server-client-55

2. Configure the /etc/my.cnf, on all servers:
$ sudo vim /etc/my.cnf

[mysqld]
# basic settings
datadir = /opt/mysql/data
tmpdir = /opt/mysql/tmp
socket = /opt/mysql/run/mysqld.sock
port = 3306
pid-file = /opt/mysql/run/mysqld.pid

# innodb settings
default-storage-engine = INNODB
innodb_file_per_table = 1
log-bin = /opt/mysql/binlogs/bin-log-mysqld
log-bin-index = /opt/mysql/binlogs/bin-log-mysqld.index
innodb_data_home_dir = /opt/mysql/data
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /opt/mysql/data
binlog-do-db = testdb

# server id
server-id=1

# other settings
max_allowed_packet = 64M
max_connections = 1024
expire_logs_days = 14
character-set-server = utf8

[mysqld_safe]
log-error = /opt/mysql/log/mysqld.log
pid-file = /opt/mysql/run/mysqld.pid
open-files-limit = 8192

[mysqlhotcopy]
interactive-timeout

[client]
port = 3306
socket = /opt/mysql/run/mysqld.sock
default-character-set = utf8

3. Create directories, on all servers:
$ sudo mkdir -p /opt/mysql/{data,tmp,run,binlogs,log}
$ sudo chown mysql:mysql /opt/mysql/{data,tmp,run,binlogs,log}

4. Initialize the database, on all servers:
$ sudo -i
# su - mysql
$ mysql_install_db --user=mysql --datadir=/opt/mysql/data/
$ exit
# exit
$ sudo /etc/init.d/mysql start

5. Remove them without dependencies, on all servers:
Because if we install xtradb cluster, we will get error messages like:
Error: Percona-XtraDB-Cluster-client conflicts with Percona-Server-client-55-5.5.34-rel32.0.591.rhel6.x86_64
Error: Percona-XtraDB-Cluster-server conflicts with Percona-Server-server-55-5.5.34-rel32.0.591.rhel6.x86_64
Error: Percona-XtraDB-Cluster-shared conflicts with Percona-Server-shared-55-5.5.34-rel32.0.591.rhel6.x86_64

$ sudo /etc/init.d/mysql stop
$ sudo rpm -qa | grep Percona-Server | grep -v compat | xargs sudo rpm -e --nodeps
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