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          Mysql雙主雙從（實(shí)戰(zhàn)干貨，好文章！?。?/h1>
          共
                14309字，需瀏覽
                    29分鐘
                
           ·
          2021-04-27 23:35
          
                    

                    
                    
                    
                    
          1.機(jī)器說明


          因?yàn)橹?，從2，都是通過同一個(gè)鏡像生成的系統(tǒng)，所以mysql的 server-uuid 是一樣的，在配置前，需要做以下操作
          重命名 /var/lib/mysql/auto.cnf 文件
          mv auto.cnf auto.cnf.bak
          重啟mysql 重新生成 auto.cnf 文件




          因?yàn)橹芭渲眠^ ali-shuidi01,ali-shuidi02的主從關(guān)系，所以先將兩者之前的主從關(guān)系取消，在master1上執(zhí)行
           
          1. mysql> stop slave;
          2. Query OK, 0 rows affected, 1 warning (0.00 sec)

          4. mysql> reset master;
          5. Query OK, 0 rows affected (0.01 sec)

          2. master1 配置文件修改
          vim /etc/my.cnf

           
          1. #主服務(wù)器唯一ID
          2. server-id=1
          3. #啟用二進(jìn)制日志
          4. log-bin=mysql-bin
          5. # 設(shè)置不要復(fù)制的數(shù)據(jù)庫(可設(shè)置多個(gè))
          6. binlog-ignore-db=mysql
          7. binlog-ignore-db=information_schema
          8. binlog-ignore-db=performance_schema
          9. binlog-ignore-db=sys
          10. #設(shè)置需要復(fù)制的數(shù)據(jù)庫
          11. binlog-do-db=copydb2
          12. #設(shè)置logbin格式
          13. binlog_format=STATEMENT
          14. # 在作為從數(shù)據(jù)庫的時(shí)候，有寫入操作也要更新二進(jìn)制日志文件
          15. log-slave-updates
          16. #表示自增長字段每次遞增的量，指自增字段的起始值，其默認(rèn)值是1，取值范圍是1 .. 65535
          17. auto-increment-increment=2
          18. # 表示自增長字段從哪個(gè)數(shù)開始，指字段一次遞增多少，他的取值范圍是1 .. 65535
          19. auto-increment-offset=1

          3. master2 配置文件修改
          vim /etc/my.cnf

           
          1. #主服務(wù)器唯一ID
          2. server-id=3
          3. #啟用二進(jìn)制日志
          4. log-bin=mysql-bin
          5. # 設(shè)置不要復(fù)制的數(shù)據(jù)庫(可設(shè)置多個(gè))
          6. binlog-ignore-db=mysql
          7. binlog-ignore-db=information_schema
          8. binlog-ignore-db=performance_schema
          9. binlog-ignore-db=sys
          10. #設(shè)置需要復(fù)制的數(shù)據(jù)庫
          11. binlog-do-db=copydb2
          12. #設(shè)置logbin格式
          13. binlog_format=STATEMENT
          14. # 在作為從數(shù)據(jù)庫的時(shí)候，有寫入操作也要更新二進(jìn)制日志文件
          15. log-slave-updates
          16. #表示自增長字段每次遞增的量，指自增字段的起始值，其默認(rèn)值是1，取值范圍是1 .. 65535
          17. auto-increment-increment=2
          18. # 表示自增長字段從哪個(gè)數(shù)開始，指字段一次遞增多少，他的取值范圍是1 .. 65535
          19. auto-increment-offset=2

          4. slave1 配置文件修改
          vim /etc/my.cnf

           
          1. #從服務(wù)器唯一ID
          2. server-id=2
          3. #啟用中繼日志
          4. relay-log=mysql-relay

          5. slave2配置文件修改

          vim /etc/my.cnf

           
          1. #從服務(wù)器唯一ID
          2. server-id=4 #啟用中繼日志
          3. relay-log=mysql-relay

          6. 雙主機(jī)、雙從機(jī)重啟 mysql 服務(wù), 主機(jī)從機(jī)都關(guān)閉防火墻

           
          1. [root@shuidi01 etc]# systemctl restart mysqld
          2. [root@shuidi01 etc]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: active (running) since 一 2020-03-30 20:38:23 CST; 6s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 9985 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 9946 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 9990 (mysqld)
          11. CGroup: /system.slice/mysqld.service
          12. └─9990 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

          14. 3月 30 20:38:22 shuidi01 systemd[1]: Starting MySQL Server...
          15. 3月 30 20:38:23 shuidi01 systemd[1]: Started MySQL Server.

           
          1. [root@shuidi02 etc]# systemctl restart mysqld
          2. [root@shuidi02 etc]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: active (running) since 一 2020-03-30 20:39:10 CST; 7s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 868 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 845 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 873 (mysqld)
          11. CGroup: /system.slice/mysqld.service
          12. └─873 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

          14. 3月 30 20:39:09 shuidi02 systemd[1]: Starting MySQL Server...
          15. 3月 30 20:39:10 shuidi02 systemd[1]: Started MySQL Server.

           
          1. [root@shuidi03 etc]# systemctl restart mysqld
          2. [root@shuidi03 etc]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: active (running) since 一 2020-03-30 20:39:42 CST; 5s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 8507 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 8485 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 8512 (mysqld)
          11. CGroup: /system.slice/mysqld.service
          12. └─8512 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

          14. 3月 30 20:39:41 shuidi03 systemd[1]: Starting MySQL Server...
          15. 3月 30 20:39:42 shuidi03 systemd[1]: Started MySQL Server.

           
          1. [root@shuidi04 etc]# systemctl restart mysqld
          2. [root@shuidi04 etc]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: active (running) since 一 2020-03-30 20:40:13 CST; 8s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 8861 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 8839 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 8866 (mysqld)
          11. CGroup: /system.slice/mysqld.service
          12. └─8866 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

          14. 3月 30 20:40:12 shuidi04 systemd[1]: Starting MySQL Server...
          15. 3月 30 20:40:13 shuidi04 systemd[1]: Started MySQL Server.

          7. 在兩臺主機(jī)上建立賬戶并授權(quán) slave
          master1:
           
          1. mysql> GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%' IDENTIFIED BY 'Zan_666888';
          2. Query OK, 0 rows affected, 1 warning (0.00 sec)
          3. #查詢Master1的狀態(tài)
          4. mysql> show master status;
          5. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          6. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
          7. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          8. | mysql-bin.000002 | 435 | copydb2 | mysql,information_schema,performance_schema,sys | |
          9. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          10. 1 row in set (0.00 sec)
          master2:
           
          1. mysql> GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%' IDENTIFIED BY 'Zan_666888';
          2. Query OK, 0 rows affected, 1 warning (0.01 sec)
          3. #查詢Master2的狀態(tài)
          4. mysql> show master status;
          5. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          6. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
          7. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          8. | mysql-bin.000001 | 435 | copydb2 | mysql,information_schema,performance_schema,sys | |
          9. +------------------+----------+--------------+-------------------------------------------------+-------------------+
          10. 1 row in set (0.00 sec)
          #分別記錄下File和Position的值
          #執(zhí)行完此步驟后不要再操作主服務(wù)器MYSQL，防止主服務(wù)器狀態(tài)值變化

          8. 在從機(jī)上配置需要復(fù)制的主機(jī)
          Slava1 復(fù)制 Master1，Slava2 復(fù)制 Master2

           
          1. #復(fù)制主機(jī)的命令
          2. CHANGE MASTER TO MASTER_HOST='主機(jī)的IP地址',
          3. MASTER_USER='slave',
          4. MASTER_PASSWORD='123123',
          5. MASTER_LOG_FILE='mysql-bin.具體數(shù)字',MASTER_LOG_POS=具體值;
          slave1:
           
          1. CHANGE MASTER TO MASTER_HOST='172.16.94.131',
          2. MASTER_USER='slave',
          3. MASTER_PASSWORD='Zan_666888',
          4. MASTER_LOG_FILE='mysql-bin.000002',MASTER_LOG_POS=435;
          slave2:
           
          1. CHANGE MASTER TO MASTER_HOST='172.16.94.133',
          2. MASTER_USER='slave',
          3. MASTER_PASSWORD='Zan_666888',
          4. MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=435;
          #啟動兩臺從服務(wù)器復(fù)制功能
          slave1:
           
          1. mysql> start slave;
          2. #查看從服務(wù)器狀態(tài)
          3. show slave status\G;

          slave2:
          mysql> start slave; #查看從服務(wù)器狀態(tài) show slave status\G;

          #下面兩個(gè)參數(shù)都是Yes，則說明主從配置成功！
          # Slave_IO_Running: Yes
          # Slave_SQL_Running: Yes

          9. 兩個(gè)主機(jī)互相復(fù)制
          Master2 復(fù)制 Master1，Master1 復(fù)制 Master2

          master2:
           
          1. mysql> CHANGE MASTER TO MASTER_HOST='172.16.94.131',
          2. -> MASTER_USER='slave',
          3. -> MASTER_PASSWORD='Zan_666888',
          4. -> MASTER_LOG_FILE='mysql-bin.000002',MASTER_LOG_POS=435;
          5. Query OK, 0 rows affected, 2 warnings (0.02 sec)

          7. mysql> start slave;
          8. Query OK, 0 rows affected (0.00 sec)

          10. mysql> show slave status\G;


          master1:

           
          1. mysql> CHANGE MASTER TO MASTER_HOST='172.16.94.133',
          2. -> MASTER_USER='slave',
          3. -> MASTER_PASSWORD='Zan_666888',
          4. -> MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=435;
          5. Query OK, 0 rows affected, 2 warnings (0.02 sec)

          7. mysql> start slave;
          8. Query OK, 0 rows affected (0.00 sec)

          10. mysql> show slave status\G;


          #下面兩個(gè)參數(shù)都是Yes，則說明主從配置成功！
          # Slave_IO_Running: Yes
          # Slave_SQL_Running: Yes

          10. Master1 主機(jī)新建庫、新建表、insert 記錄，Master2 和從機(jī)復(fù)制
           
          1. mysql> CREATE DATABASE copydb2;
          2. Query OK, 1 row affected (0.00 sec)

          4. mysql> show databases;
          5. +--------------------+
          6. | Database |
          7. +--------------------+
          8. | information_schema |
          9. | copydb |
          10. | copydb2 |
          11. | mysql |
          12. | nacos_config |
          13. | performance_schema |
          14. | seata |
          15. | seata_account |
          16. | seata_order |
          17. | seata_storage |
          18. | sys |
          19. +--------------------+
          20. 11 rows in set (0.00 sec)

          22. mysql> use copydb2;
          23. Database changed
          24. mysql> CREATE TABLE mytbl(id INT,NAME VARCHAR(20));
          25. Query OK, 0 rows affected (0.01 sec)

          27. mysql> INSERT INTO mytbl VALUES(1,'zhang3');
          28. Query OK, 1 row affected (0.01 sec)

          30. mysql> select * from mytbl;
          31. +------+--------+
          32. | id | NAME |
          33. +------+--------+
          34. | 1 | zhang3 |
          35. +------+--------+
          36. 1 row in set (0.00 sec)


          四個(gè)節(jié)點(diǎn)數(shù)據(jù)均實(shí)現(xiàn)了同步

          11.如何停止從服務(wù)復(fù)制功能
          stop slave;
          如何重新配置主從
          stop slave; reset master;

          12.修改 Mycat 的配置文件
          /usr/local/mycat/conf/schema.xml
          修改<dataHost>的balance屬性，通過此屬性配置讀寫分離的類型

          負(fù)載均衡類型，目前的取值有4 種：
          （1）balance="0", 不開啟讀寫分離機(jī)制，所有讀操作都發(fā)送到當(dāng)前可用的 writeHost 上。
          （2）balance="1"，全部的 readHost 與 stand by writeHost 參與 select 語句的負(fù)載均衡，簡單地說，當(dāng)雙主雙從
          模式(M1->S1，M2->S2，并且 M1 與 M2 互為主備)，正常情況下，M2,S1,S2 都參與 select 語句的負(fù)載均衡。
          （3）balance="2"，所有讀操作都隨機(jī)的在 writeHost、readhost 上分發(fā)。
          （4）balance="3"，所有讀請求隨機(jī)的分發(fā)到 readhost 執(zhí)行，writerHost 不負(fù)擔(dān)讀壓力

          為了雙主雙從讀寫分離balance設(shè)置為1

           
          1. <?xml version="1.0"?>
          2. <!DOCTYPE mycat:schema SYSTEM "schema.dtd">
          3. <mycat:schema xmlns:mycat="http://io.mycat/">

          5. <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">

          7. </schema>

          9. <dataNode name="dn1" dataHost="host1" database="copydb2" />

          11. <dataHost name="host1" maxCon="1000" minCon="10" balance="1"
          12. writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
          13. <heartbeat>select user()</heartbeat>

          15. <writeHost host="hostM1" url="172.16.94.131:3306" user="root"
          16. password="Zan_123456">

          18. <readHost host="hostS1" url="172.16.94.132:3306" user="root" password="Zan_123456" />
          19. </writeHost>

          21. <writeHost host="hostM2" url="172.16.94.133:3306" user="root"
          22. password="Zan_123456">

          24. <readHost host="hostS2" url="172.16.94.134:3306" user="root" password="Zan_123456" />
          25. </writeHost>

          27. </dataHost>

          29. </mycat:schema>
          #balance="1": 全部的readHost與stand by writeHost參與select語句的負(fù)載均衡。
          #writeType="0": 所有寫操作發(fā)送到配置的第一個(gè)writeHost，第一個(gè)掛了切到還生存的第二個(gè)
          #writeType="1"，所有寫操作都隨機(jī)的發(fā)送到配置的 writeHost，1.5 以后廢棄不推薦
          #writeHost，重新啟動后以切換后的為準(zhǔn)，切換記錄在配置文件中:dnindex.properties 。
          #switchType="1": 1 默認(rèn)值，自動切換。
          # -1 表示不自動切換
          # 2 基于 MySQL 主從同步的狀態(tài)決定是否切換。

          13.啟動 Mycat,驗(yàn)證讀寫分離
           
          1. [root@shuidi01 bin]# ./mycat stop
          2. Stopping Mycat-server...
          3. Mycat-server was not running.
          4. [root@shuidi01 bin]# ./mycat start
          5. Starting Mycat-server...


           
          1. #登錄mycat
          2. mysql -umycat -pzan123456 -P 8066 -h 127.0.0.1
          3. #插入數(shù)據(jù)
          4. mysql> show databases;
          5. +----------+
          6. | DATABASE |
          7. +----------+
          8. | TESTDB |
          9. +----------+
          10. 1 row in set (0.00 sec)

          12. mysql> use TESTDB;
          13. Reading table information for completion of table and column names
          14. You can turn off this feature to get a quicker startup with -A

          16. Database changed
          17. mysql> show tables;
          18. +-------------------+
          19. | Tables_in_copydb2 |
          20. +-------------------+
          21. | mytbl |
          22. +-------------------+
          23. 1 row in set (0.00 sec)
          24. mysql> INSERT INTO mytbl VALUES(2,@@hostname);
          25. Query OK, 1 row affected, 1 warning (0.00 sec)

          27. mysql> select * from mytbl;
          28. +------+----------+
          29. | id | NAME |
          30. +------+----------+
          31. | 1 | zhang3 |
          32. | 2 | shuidi03 |
          33. +------+----------+
          34. 2 rows in set (0.00 sec)

          36. mysql> select * from mytbl;
          37. +------+----------+
          38. | id | NAME |
          39. +------+----------+
          40. | 1 | zhang3 |
          41. | 2 | shuidi02 |
          42. +------+----------+
          43. 2 rows in set (0.00 sec)
          44. mysql> select * from mytbl;
          45. +------+----------+
          46. | id | NAME |
          47. +------+----------+
          48. | 1 | zhang3 |
          49. | 2 | shuidi04 |
          50. +------+----------+
          51. 2 rows in set (0.00 sec)

          #在Mycat里查詢mytbl表,可以看到查詢語句在Master2（shuidi03）、Slava1（shuidi02）、Slava2（shuidi04）主從三個(gè)主機(jī)間切換

          14.抗風(fēng)險(xiǎn)能力
          #停止數(shù)據(jù)庫Master1
           
          1. [root@shuidi01 logs]# systemctl stop mysqld
          2. [root@shuidi01 logs]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: inactive (dead) since 一 2020-03-30 21:31:28 CST; 4s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 9985 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 9946 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 9990 (code=exited, status=0/SUCCESS)

          12. 3月 30 20:38:22 shuidi01 systemd[1]: Starting MySQL Server...
          13. 3月 30 20:38:23 shuidi01 systemd[1]: Started MySQL Server.
          14. 3月 30 21:31:16 shuidi01 systemd[1]: Stopping MySQL Server...
          15. 3月 30 21:31:28 shuidi01 systemd[1]: Stopped MySQL Server.

          #在Mycat里插入數(shù)據(jù)依然成功，Master2自動切換為寫主機(jī)
           
          1. mysql> INSERT INTO mytbl VALUES(3,@@hostname);
          2. Query OK, 1 row affected, 1 warning (0.00 sec)
          3. mysql> select * from mytbl;
          4. +------+----------+
          5. | id | NAME |
          6. +------+----------+
          7. | 1 | zhang3 |
          8. | 2 | shuidi04 |
          9. | 3 | shuidi04 |
          10. +------+----------+
          11. 3 rows in set (0.00 sec)

          #啟動數(shù)據(jù)庫Master1
           
          1. [root@shuidi01 logs]# systemctl start mysqld
          2. [root@shuidi01 logs]# systemctl status mysqld
          3. ● mysqld.service - MySQL Server
          4. Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
          5. Active: active (running) since 一 2020-03-30 21:33:39 CST; 2s ago
          6. Docs: man:mysqld(8)
          7. http://dev.mysql.com/doc/refman/en/using-systemd.html
          8. Process: 3527 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
          9. Process: 3473 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
          10. Main PID: 3531 (mysqld)
          11. CGroup: /system.slice/mysqld.service
          12. └─3531 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

          14. 3月 30 21:33:38 shuidi01 systemd[1]: Starting MySQL Server...
          15. 3月 30 21:33:39 shuidi01 systemd[1]: Started MySQL Server.

           
          1. mysql> select * from mytbl;
          2. +------+----------+
          3. | id | NAME |
          4. +------+----------+
          5. | 1 | zhang3 |
          6. | 2 | shuidi01 |
          7. | 3 | shuidi01 |
          8. +------+----------+
          9. 3 rows in set (0.00 sec)
          10. mysql> select * from mytbl;
          11. +------+----------+
          12. | id | NAME |
          13. +------+----------+
          14. | 1 | zhang3 |
          15. | 2 | shuidi02 |
          16. | 3 | shuidi02 |
          17. +------+----------+
          18. 3 rows in set (0.00 sec)
          19. mysql> select * from mytbl;
          20. +------+----------+
          21. | id | NAME |
          22. +------+----------+
          23. | 1 | zhang3 |
          24. | 2 | shuidi04 |
          25. | 3 | shuidi04 |
          26. +------+----------+
          27. 3 rows in set (0.00 sec)

          #在Mycat里查詢mytbl表,可以看到查詢語句在Master1（shuidi01）、Slava1（shuidi02）、Slava2（shuidi04）
          主從三個(gè)主機(jī)間切換
          Master1、Master2 互做備機(jī)，負(fù)責(zé)寫的主機(jī)宕機(jī)，備機(jī)切換負(fù)責(zé)寫操作，保證數(shù)據(jù)庫讀寫分離高
          可用性。

          
                
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