（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  rsync 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="test"
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://192.168.1.31,192.168.1.32,192.168.1.33"
wsrep_cluster_name="test"
wsrep_node_address="192.168.1.32"
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"

• node3:192.168.1.33

#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://192.168.1.31,192.168.1.32,192.168.1.33"
wsrep_cluster_name="test"
wsrep_node_address="192.168.1.33"
wsrep_node_name="node3"
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"

注意：node定义刚开始定义集群是wsrep_cluster_address="gcomm://"，如果node1重启Mysql服务，

这个地址需要修改wsrep_cluster_address="gcomm://192.168.1.33,192.168.1.32,192.168.1.31"

• 参数解释
  
  wsrep_incoming_addresses ：表示集群主机ip
  
  wsrep_cluster_size ：集群主机统计数量
  
  wsrep_connected ：连接状态