在上一片博客中，讲述了怎么去配置MHA架构！这片博客不再细说，只说明其中MySQL主从搭建，这里使用的是gtid加上半同步复制！
步骤与上一片博客一样，不同之处在于MySQL主从的搭建！详细的gtid搭建过程https://www.cnblogs.com/wxzhe/p/10055154.html
上一片博客中，把MySQL主从的搭建由filename和pos的过程改变为如下的基于gtid的过程就可以，因此不再详细说明，只展示gtid的搭建！
四台服务器分配如下：
MHA管理节点： 10.0.102.214
MySQL主节点： 10.0.102.204
MySQL从节点1： 10.0.102.179 【这个节点可以作为备用的主】
MySQL从节点2： 10.0.102.221
搭建基于gtid的数据库复制！
第一步：保证三个服务器的数据是一致的【处于一致的状态】
第二步：在主上和备用的主上创建复制账户，用户名和密码要保持一致！
第三步：开启gtid，加载半同步复制的插件！
三台服务器中配置文件加入以下参照：
plugin_dir=/usr/local/mysql/lib/plugin/ #因为这里MySQL5.7是源码安装的位置，若是使用rpm包安装，则注意更改位置 plugin_load=semisync_master.so #这两个插件尽量在每个服务器都安装吧 plugin_load=semisync_slave.so gtid-mode=on #开启gtid enforce-gtid-consistency #确保gtid全局的一致性 log-bin= character_set_server=utf8 #设置字符集 log_slave_updates #gtid复制时，一定要开启
设置完配置文件之后，重启服务器，然后再从上执行以下命令！
mysql> change master to master_host="10.0.102.204", master_user="repl",master_password="123456",master_auto_position = 1; Query OK, 0 rows affected, 2 warnings (0.09 sec) mysql> start slave; Query OK, 0 rows affected (0.01 sec)
若上面没有报错，则使用show slave status查看复制的状态！
检查MHA的状态
ssh状态检查：
[root@test3 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf Sun Dec 9 11:42:50 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:42:50 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Starting SSH connection tests.. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:50 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [info] All SSH connection tests passed successfully.
[root@test3 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf Sun Dec 9 11:42:50 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:42:50 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Starting SSH connection tests.. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:50 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [info] All SSH connection tests passed successfully. [root@test3 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf Sun Dec 9 11:43:39 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:43:39 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:43:39 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:43:39 2018 - [info] MHA::MasterMonitor version 0.56. Sun Dec 9 11:43:39 2018 - [info] GTID failover mode = 1 Sun Dec 9 11:43:39 2018 - [info] Dead Servers: Sun Dec 9 11:43:39 2018 - [info] Alive Servers: Sun Dec 9 11:43:39 2018 - [info] 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.179(10.0.102.179:3306) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.221(10.0.102.221:3306) Sun Dec 9 11:43:39 2018 - [info] Alive Slaves: Sun Dec 9 11:43:39 2018 - [info] 10.0.102.179(10.0.102.179:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 11:43:39 2018 - [info] GTID ON Sun Dec 9 11:43:39 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Primary candidate for the new Master (candidate_master is set) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.221(10.0.102.221:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 11:43:39 2018 - [info] GTID ON Sun Dec 9 11:43:39 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Not candidate for the new Master (no_master is set) Sun Dec 9 11:43:39 2018 - [info] Current Alive Master: 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Checking slave configurations.. Sun Dec 9 11:43:39 2018 - [info] read_only=1 is not set on slave 10.0.102.179(10.0.102.179:3306). Sun Dec 9 11:43:39 2018 - [info] read_only=1 is not set on slave 10.0.102.221(10.0.102.221:3306). Sun Dec 9 11:43:39 2018 - [info] Checking replication filtering settings.. Sun Dec 9 11:43:39 2018 - [info] binlog_do_db= , binlog_ignore_db= Sun Dec 9 11:43:39 2018 - [info] Replication filtering check ok. Sun Dec 9 11:43:39 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Sun Dec 9 11:43:39 2018 - [info] Checking SSH publickey authentication settings on the current master.. Sun Dec 9 11:43:39 2018 - [info] HealthCheck: SSH to 10.0.102.204 is reachable. Sun Dec 9 11:43:39 2018 - [info] 10.0.102.204(10.0.102.204:3306) (current master) +--10.0.102.179(10.0.102.179:3306) +--10.0.102.221(10.0.102.221:3306) Sun Dec 9 11:43:39 2018 - [info] Checking replication health on 10.0.102.179.. Sun Dec 9 11:43:39 2018 - [info] ok. Sun Dec 9 11:43:39 2018 - [info] Checking replication health on 10.0.102.221.. Sun Dec 9 11:43:39 2018 - [info] ok. Sun Dec 9 11:43:39 2018 - [info] Checking master_ip_failover_script status: Sun Dec 9 11:43:39 2018 - [info] /usr/local/bin/master_ip_failover --ssh_user=root --command=status --ssh_user=root --orig_master_host=10.0.102.204 --orig_master_ip=10.0.102.204 --orig_master_port=3306 IN SCRIPT TEST====service keepalived stop==service keepalived start=== Checking the Status of the script.. OK Sun Dec 9 11:43:39 2018 - [info] OK. Sun Dec 9 11:43:39 2018 - [warning] shutdown_script is not defined. Sun Dec 9 11:43:39 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK. [root@test3