（十六）MySQL集群galera实现

(1)环境介绍

galera官网：http://galeracluster.com/downloads/
# cat /etc/redhat-release 
CentOS Linux release 7.3.1611 (Core) 

(2)以下配置三台服务器都相同

• 关闭防火墙和selinux

  systemctl disable firewalld 
  systemctl stop firewalld
  sed -ri '/SELINUX=/cSELINUX=disabled' /etc/selinux/config
  setenforce 0

• 配置yum源

  cat >>/etc/yum.repos.d/galera.repo<<EOF
  [galera1]
  name=galera1
  baseurl=http://releases.galeracluster.com/mysql-wsrep-5.7/centos/7/x86_64/
  gpgcheck=0
  [galera2]
  name=galera2
  baseurl=http://releases.galeracluster.com/galera-3/centos/7/x86_64/
  gpgcheck=0
  EOF

• 安装mysql和galera插件

  yum repolist
  yum list | egrep "wsrep|galera"
  yum -y install mysql-wsrep-server-5.7.x86_64 
  yum install galera-3.x86_64 -y

• 启动mysqld

  systemctl start mysqld
  systemctl enable mysqld
  newpass=$(grep "temporary password" /var/log/mysqld.log | awk '{print $NF}')
  mysqladmin -uroot -p"$newpass" password 'Redhat@123'

• 创建用于数据同步的用户

  mysql -uroot -pRedhat@123 -e "grant all on *.* to 'copy'@'192.168.1.%' identified by 'Copy@123'"
  mysql -uroot -pRedhat@123 -e "flush privileges;"

  (3)修改配置文件：三台不一样

• node1:192.168.1.31

  #vi /etc/my.cnf
  binlog_format=row
  default_storage_engine=InnoDB
  innodb_autoinc_lock_mode=2
  bind-address=0.0.0.0
  wsrep_on=ON
  wsrep_provider=/usr/lib64/galera-3/libgalera_smm.so
  wsrep_cluster_address="gcomm://"
  wsrep_cluster_name="Cluster"
  wsrep_node_address="192.168.1.31"
  wsrep_node_name="node1"
  wsrep_sst_auth=copy:Copy@123
  wsrep_sst_method=rsync

  重启mysqld服务器：systemctl restart mysqld
  验证端口状态：ss -anltup | egrep "3306|4567"

  node1节点上查看状态
  

• node2:192.168.1.32

  #vi /etc/my.cnf
  binlog_format=row
  default_storage_engine=InnoDB
  innodb_autoinc_lock_mode=2
  bind-address=0.0.0.0
  wsrep_on=ON
  wsrep_provider=/usr/lib64/galera-3/libgalera_smm.so
  wsrep_cluster_address="gcomm://192.168.1.31"
  wsrep_cluster_name="test"
  wsrep_node_address="192.168.1.31,192.168.1.32,192.168.1.33"
  wsrep_node_name="node2"
  wsrep_sst_auth=copy:Copy@123
  wsrep_sst_method=rsync

  重启mysqld服务器：systemctl restart mysqld
  验证端口状态：ss -anltup | egrep "3306|4567"