这篇文章主要讲解了“MySQL5.7中MHA怎么添加或删除slave节点”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“MySQL5.7中MHA怎么添加或删除slave节点”吧！
数据库架构：一主两从
master：192.168.8.57
slave1：192.168.8.58
slave2：192.168.8.59
manager：192.168.8.60
MHA工具包：
mha4mysql-manager-0.58.tar.gz
mha4mysql-node-0.58.tar.gz
一、添加节点
1.安装OS，修改主机名，hosts
2.配置SSH无密码验证
master
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.61
slave1
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.61
slave2
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.61
manager
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.61
slave3
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.57 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.58 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.59 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.8.60
3.安装MySQL5.7，配置复制
change master to master_host='192.168.8.57', master_port=3306, master_user='repl', master_password='mysql', master_auto_position=1;
4.安装mha-node
tar xf mha4mysql-node-0.58.tar.gz cd mha4mysql-node-0.58 perl Makefile.PL make && make install
5.修改mha配置文件app1.cnf
[server4] hostname=192.168.8.61 port=3306
6.互信测试
Mon Oct 29 20:01:59 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Mon Oct 29 20:01:59 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:01:59 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:01:59 2018 - [info] Starting SSH connection tests.. Mon Oct 29 20:02:01 2018 - [debug] Mon Oct 29 20:01:59 2018 - [debug] Connecting via SSH from root@192.168.8.57(192.168.8.57:22) to root@192.168.8.58(192.168.8.58:22).. Mon Oct 29 20:02:00 2018 - [debug] ok. Mon Oct 29 20:02:00 2018 - [debug] Connecting via SSH from root@192.168.8.57(192.168.8.57:22) to root@192.168.8.59(192.168.8.59:22).. Mon Oct 29 20:02:00 2018 - [debug] ok. Mon Oct 29 20:02:00 2018 - [debug] Connecting via SSH from root@192.168.8.57(192.168.8.57:22) to root@192.168.8.61(192.168.8.61:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:02 2018 - [debug] Mon Oct 29 20:02:00 2018 - [debug] Connecting via SSH from root@192.168.8.58(192.168.8.58:22) to root@192.168.8.57(192.168.8.57:22).. Mon Oct 29 20:02:00 2018 - [debug] ok. Mon Oct 29 20:02:00 2018 - [debug] Connecting via SSH from root@192.168.8.58(192.168.8.58:22) to root@192.168.8.59(192.168.8.59:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:01 2018 - [debug] Connecting via SSH from root@192.168.8.58(192.168.8.58:22) to root@192.168.8.61(192.168.8.61:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:02 2018 - [debug] Mon Oct 29 20:02:00 2018 - [debug] Connecting via SSH from root@192.168.8.59(192.168.8.59:22) to root@192.168.8.57(192.168.8.57:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:01 2018 - [debug] Connecting via SSH from root@192.168.8.59(192.168.8.59:22) to root@192.168.8.58(192.168.8.58:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:01 2018 - [debug] Connecting via SSH from root@192.168.8.59(192.168.8.59:22) to root@192.168.8.61(192.168.8.61:22).. Mon Oct 29 20:02:02 2018 - [debug] ok. Mon Oct 29 20:02:03 2018 - [debug] Mon Oct 29 20:02:01 2018 - [debug] Connecting via SSH from root@192.168.8.61(192.168.8.61:22) to root@192.168.8.57(192.168.8.57:22).. Mon Oct 29 20:02:01 2018 - [debug] ok. Mon Oct 29 20:02:01 2018 - [debug] Connecting via SSH from root@192.168.8.61(192.168.8.61:22) to root@192.168.8.58(192.168.8.58:22).. Mon Oct 29 20:02:02 2018 - [debug] ok. Mon Oct 29 20:02:02 2018 - [debug] Connecting via SSH from root@192.168.8.61(192.168.8.61:22) to root@192.168.8.59(192.168.8.59:22).. Mon Oct 29 20:02:02 2018 - [debug] ok. Mon Oct 29 20:02:03 2018 - [info] All SSH connection tests passed successfully.
7.复制状况检查
Mon Oct 29 20:02:15 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Mon Oct 29 20:02:15 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:02:15 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:02:15 2018 - [info] MHA::MasterMonitor version 0.58. Mon Oct 29 20:02:17 2018 - [info] GTID failover mode = 1 Mon Oct 29 20:02:17 2018 - [info] Dead Servers: Mon Oct 29 20:02:17 2018 - [info] Alive Servers: Mon Oct 29 20:02:17 2018 - [info] 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:02:17 2018 - [info] 192.168.8.58(192.168.8.58:3306) Mon Oct 29 20:02:17 2018 - [info] 192.168.8.59(192.168.8.59:3306) Mon Oct 29 20:02:17 2018 - [info] 192.168.8.61(192.168.8.61:3306) Mon Oct 29 20:02:17 2018 - [info] Alive Slaves: Mon Oct 29 20:02:17 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Mon Oct 29 20:02:17 2018 - [info] GTID ON Mon Oct 29 20:02:17 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:02:17 2018 - [info] Primary candidate for the new Master (candidate_master is set) Mon Oct 29 20:02:17 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Mon Oct 29 20:02:17 2018 - [info] GTID ON Mon Oct 29 20:02:17 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:02:17 2018 - [info] 192.168.8.61(192.168.8.61:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Mon Oct 29 20:02:17 2018 - [info] GTID ON Mon Oct 29 20:02:17 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:02:17 2018 - [info] Current Alive Master: 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:02:17 2018 - [info] Checking slave configurations.. Mon Oct 29 20:02:17 2018 - [info] read_only=1 is not set on slave 192.168.8.58(192.168.8.58:3306). Mon Oct 29 20:02:17 2018 - [info] read_only=1 is not set on slave 192.168.8.59(192.168.8.59:3306). Mon Oct 29 20:02:17 2018 - [info] read_only=1 is not set on slave 192.168.8.61(192.168.8.61:3306). Mon Oct 29 20:02:17 2018 - [info] Checking replication filtering settings.. Mon Oct 29 20:02:17 2018 - [info] binlog_do_db= , binlog_ignore_db= Mon Oct 29 20:02:17 2018 - [info] Replication filtering check ok. Mon Oct 29 20:02:17 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Mon Oct 29 20:02:17 2018 - [info] Checking SSH publickey authentication settings on the current master.. Mon Oct 29 20:02:17 2018 - [info] HealthCheck: SSH to 192.168.8.57 is reachable. Mon Oct 29 20:02:17 2018 - [info] 192.168.8.57(192.168.8.57:3306) (current master) +--192.168.8.58(192.168.8.58:3306) +--192.168.8.59(192.168.8.59:3306) +--192.168.8.61(192.168.8.61:3306) Mon Oct 29 20:02:17 2018 - [info] Checking replication health on 192.168.8.58.. Mon Oct 29 20:02:17 2018 - [info] ok. Mon Oct 29 20:02:17 2018 - [info] Checking replication health on 192.168.8.59.. Mon Oct 29 20:02:17 2018 - [info] ok. Mon Oct 29 20:02:17 2018 - [info] Checking replication health on 192.168.8.61.. Mon Oct 29 20:02:17 2018 - [info] ok. Mon Oct 29 20:02:17 2018 - [info] Checking master_ip_failover_script status: Mon Oct 29 20:02:17 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 Mon Oct 29 20:02:17 2018 - [info] OK. Mon Oct 29 20:02:17 2018 - [warning] shutdown_script is not defined. Mon Oct 29 20:02:17 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.
8.复制测试
master
mysql> create table t12 (id int(6)); Query OK, 0 rows affected (0.09 sec) mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t10 | | t11 | | t12 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+
slave1，slave2，slave3
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t10 | | t11 | | t12 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+
三个slave节点数据一致，表t12创建成功。
二、删除节点
1.关闭slave3复制
mysql> stop slave; Query OK, 0 rows affected (0.00 sec) mysql> reset slave; Query OK, 0 rows affected (0.04 sec) mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Master_Host: 192.168.8.57 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: Read_Master_Log_Pos: 4 Relay_Log_File: localhost-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 0 Relay_Log_Space: 217 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 57 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450d Master_Info_File: /mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450b:1-4, a92f70a4-d5ea-11e8-af28-080027c0450d:1-15, a92f70a4-d5ea-11e8-af28-080027c0450f:1-8 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec)
2.关闭slave3节点MySQL进程
mysqladmin -uroot -pmysql shutdown
3.修改mha配置文件，删除以下配置
[server4] hostname=192.168.8.61 port=3306
4.重启manager监控进程
5.复制环境检查
Mon Oct 29 20:17:37 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Mon Oct 29 20:17:37 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:17:37 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Mon Oct 29 20:17:37 2018 - [info] MHA::MasterMonitor version 0.58. Mon Oct 29 20:17:38 2018 - [info] GTID failover mode = 1 Mon Oct 29 20:17:38 2018 - [info] Dead Servers: Mon Oct 29 20:17:38 2018 - [info] Alive Servers: Mon Oct 29 20:17:38 2018 - [info] 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:17:38 2018 - [info] 192.168.8.58(192.168.8.58:3306) Mon Oct 29 20:17:38 2018 - [info] 192.168.8.59(192.168.8.59:3306) Mon Oct 29 20:17:38 2018 - [info] Alive Slaves: Mon Oct 29 20:17:38 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Mon Oct 29 20:17:38 2018 - [info] GTID ON Mon Oct 29 20:17:38 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:17:38 2018 - [info] Primary candidate for the new Master (candidate_master is set) Mon Oct 29 20:17:38 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Mon Oct 29 20:17:38 2018 - [info] GTID ON Mon Oct 29 20:17:38 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:17:38 2018 - [info] Current Alive Master: 192.168.8.57(192.168.8.57:3306) Mon Oct 29 20:17:38 2018 - [info] Checking slave configurations.. Mon Oct 29 20:17:38 2018 - [info] read_only=1 is not set on slave 192.168.8.58(192.168.8.58:3306). Mon Oct 29 20:17:38 2018 - [info] read_only=1 is not set on slave 192.168.8.59(192.168.8.59:3306). Mon Oct 29 20:17:38 2018 - [info] Checking replication filtering settings.. Mon Oct 29 20:17:38 2018 - [info] binlog_do_db= , binlog_ignore_db= Mon Oct 29 20:17:38 2018 - [info] Replication filtering check ok. Mon Oct 29 20:17:38 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Mon Oct 29 20:17:38 2018 - [info] Checking SSH publickey authentication settings on the current master.. Mon Oct 29 20:17:38 2018 - [info] HealthCheck: SSH to 192.168.8.57 is reachable. Mon Oct 29 20:17:38 2018 - [info] 192.168.8.57(192.168.8.57:3306) (current master) +--192.168.8.58(192.168.8.58:3306) +--192.168.8.59(192.168.8.59:3306) Mon Oct 29 20:17:38 2018 - [info] Checking replication health on 192.168.8.58.. Mon Oct 29 20:17:38 2018 - [info] ok. Mon Oct 29 20:17:38 2018 - [info] Checking replication health on 192.168.8.59.. Mon Oct 29 20:17:38 2018 - [info] ok. Mon Oct 29 20:17:38 2018 - [info] Checking master_ip_failover_script status: Mon Oct 29 20:17:38 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 Mon Oct 29 20:17:39 2018 - [info] OK. Mon Oct 29 20:17:39 2018 - [warning] shutdown_script is not defined. Mon Oct 29 20:17:39 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.
感谢各位的阅读，以上就是“MySQL5.7中MHA怎么添加或删除slave节点”的内容了，经过本文的学习后，相信大家对MySQL5.7中MHA怎么添加或删除slave节点这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是亿速云，小编将为大家推送更多相关知识点的文章，欢迎关注！
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