【mha】
MHA作为MySQL故障切换和主从提升的高可用软件,在故障切换过程中，MHA能做到在0~30秒之内自动完成数据库的故障切换操作，并且在进行故障切换的过程中，MHA能在最大程度上保证数据的一致性，以达到真正意义上的高可用。
- 从宕机崩溃的master保存二进制日志事件（binlog events）;
- 识别含有最新更新的slave；
- 应用差异的中继日志（relay log）到其他的slave；
- 应用从master保存的二进制日志事件（binlog events）；
- 提升一个slave为新的master；
- 使其他的slave连接新的master进行复制；
一、架构概况
192.168.56.101 master
192.168.56.102 slave master
192.168.56.103 slave/mha manager
OS为centos 7.2
版本：MySQL 5.7.18
架构图：
二、安装步骤
1、安装MySQL【略】
2、配置基于组提交的半同步复制
3、配置mha
4、配置keepalive
三、配置基于组提交的半同步复制
master: mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so'; --安装 semisync_master.so插件 master my.cnf [mysqld] rpl_semi_sync_master_enabled = 1 rpl_semi_sync_master_timeout = 1000 slave: root@localhost [zw3306]>install plugin rpl_semi_sync_slave soname 'semisync_slave.so'; --安装 semisync_slave.so插件 slave my.cnf [mysqld] rpl_semi_sync_slave_enabled = 1 GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.56.102' IDENTIFIED BY 'XXX'; GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.56.103' IDENTIFIED BY 'XXX'; #MTS slave_parallel_type=LOGICAL_CLOCK slave_parallel_workers=4 master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_recovery=ON
四、配置mha
1、三节点 ssh 互信配置(root用户)
2、192.168.56.101/192.168.56.102/192.168.56.103
yum install mha4mysql-node-0.54-0.el6.noarch.rpm ln -s /app/mysql/bin/mysql /usr/bin/mysql ln -s /app/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.56.%' IDENTIFIED BY 'repluser'; grant all privileges on *.* to mha_check@'10.78.220.%' identified by 'mha_check'; flush privileges;
3、192.168.56.103
yum install mha4mysql-manager-0.55-0.el6.noarch.rpm mkdir -p /etc/masterha/ vi /etc/masterha/mha.cnf --参考附件样例 vi /etc/masterha/master_ip_failover --参考附件样例
4、启动
验证 masterha_check_ssh --conf=/etc/masterha/mha.conf masterha_check_status --conf=/etc/masterha/mha.conf masterha_check_repl --conf=/etc/masterha/mha.conf 启动MHA nohup masterha_manager --conf=/etc/masterha/mha.conf --ignore_fail_on_start >/etc/masterha/mha_manager.log 2>&1 &
五、配置keepalive
安装依赖包 : yum install -y openssl openssl-devel yum install popt-devel -y yum -y install gcc automake autoconf libtool make ----------------------------------------------------------------------------------------------- 安装： tar -zxvf keepalived-1.2.7.tar.gz cd keepalived-1.2.7 ./configure --prefix=/usr/local/keepalived make && make install copy文件到指定目录 cp /usr/local/keepalived/sbin/keepalived /usr/sbin/ cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ 配置文件 mkdir /etc/keepalived cd /etc/keepalived [root@master ~]# vi /etc/keepalived/keepalived.conf ! Configuration File forkeepalived global_defs { router_id MYSQL_HA #标识，双主相同 } vrrp_instance VI_1 { state BACKUP #两台都设置BACKUP interface eth0 virtual_router_id 101 #主备相同 priority 100 #优先级，backup设置90 advert_int 1 nopreempt #不主动抢占资源，只在master这台优先级高的设置，backup不设置 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.70.195.20 } } [root@master ~]# /etc/init.d/keepalived start
