galera for mysql
前期准备
三台虚拟机： 192.168.137.52
192.168.137.53
192.168.137.54
系统环境： # yum install gcc gcc-c++
# yum install boost-devel
# yum install scons check-devel openssl-devel
开始安装mysql
mysql的版本一定是要打过wsrep补丁的，直接用mariadb也可以
# yum install libaio
# wget https://launchpad.net/codership-mysql/5.5/5.5.29-23.7.3/+download/mysql-5.5.29_wsrep_23.7.3-linux-x86_64.tar.gz
# tar zxvf mysql-5.5.29_wsrep_23.7.3-linux-x86_64.tar.gz
# mv mysql-5.5.29_wsrep_23.7.3-linux-x86_64 /usr/local/mysql
# cd /usr/local/mysql/
# groupadd mysql
# useradd -r -g mysql mysql
# chown -R mysql:mysql .
# ./scripts/mysql_install_db --no-defaults --datadir=/usr/local/mysql/data --user=mysql
# chown -R root .
# chown -R mysql data
# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
# mkdir -p /var/lib/mysql
# chown mysql:mysql /var/lib/mysql
再给mysql安装galera插件
# wget https://launchpad.net/galera/2.x/23.2.4/+download/galera-23.2.4-src.tar.gz
# tar zxvf galera-23.2.4-src.tar.gz # cd galera-23.2.4-src
# scons
# cp garb/garbd /usr/local/mysql/bin/
# cp libgalera_smm.so /usr/local/mysql/lib/plugin/
mysql的配置文件my.cnf
[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
[mysqld_safe]
log-error = /var/lib/mysql/mysql.log
pid-file = /var/lib/mysql/mysql.pid
[mysqld] wsrep_node_name = node1
wsrep_provider = /usr/local/mysql/lib/plugin/libgalera_smm.so
#wsrep_provider_options ='gcache.size=1G;socket.ssl_key=my_key;socket.ssl_cert=my_cert'
#wsrep_slave_threads=16
wsrep_sst_method = rsync
#wsrep_sst_auth=root:
port = 3306
socket = /var/lib/mysql/mysql.sock
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
default_storage_engine=InnoDB
#innodb_buffer_pool_size=1G
#innodb_log_file_size=256M
innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_flush_log_at_trx_commit=0
innodb_doublewrite=0
innodb_file_per_table=1
binlog_format=ROW
log-bin=mysql-bin
server-id=52
relay-log=mysql-relay-bin
#read_only=1
log-slave-updates=1
已经完成了对galera的基本配置，接下去启动galera for mysql
初次启动：
/usr/local/mysql/bin/mysqld_safe --wsrep_cluster_address=gcomm://
或者
service mysql start --wsrep_cluster_address=gcomm://
查看mysqld监听端口：
# netstat -plantu | grep mysqld
注: 1)”gcomm://”是特殊的地址,仅仅是galera cluster初始化启动时候使用,再次启动的时候需要使用具体的IP地址.
2) 端口4567是wsrep使用的默认端口.该端口的防火墙设置规则应该和3306的一样.
关闭：
# /usr/local/mysql/bin/mysqladmin -uroot -p shutdown
接下去就要添加新节点了
添加新节点的时候,新接入的节点叫Joiner,给joiner提供复制的节点叫Donor.新的节点接入需要:
1) 安装带wsrep patch的MySQL版本
2) 安装Galera复制插件
3) 配置好新节点的MySQL(参考Donnor的my.cnf)
4) 配置或启动的gcomm://的地址是需要使用donnor的IP.
新节点启动：
# service mysql start --wsrep_cluster_address="gcomm://192.168.137.52:4567,192.168.137.54:4567"
这样，三个节点搭建成了mysql galera。
查看整个集群状态：
mysql> show status like 'wsrep%';