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1,背景需求
由于現(xiàn)網(wǎng)的環(huán)境,經(jīng)過(guò)近期監(jiān)控,發(fā)現(xiàn)MYSQL主庫(kù)的IO讀寫(xiě)壓力比較大,需要部署新的MYSQL從庫(kù),進(jìn)一步分?jǐn)侻YSQL主庫(kù)的壓力,以及現(xiàn)存MYSQL從庫(kù)的讀負(fù)載。為了減少對(duì)于MYSQL主庫(kù)的IO讀取性能沖擊,采用基于MYSQL現(xiàn)存從庫(kù)構(gòu)建新的MYSQL從庫(kù)。
2,現(xiàn)存的數(shù)據(jù)庫(kù)架構(gòu)
編號(hào) IP地址 數(shù)據(jù)庫(kù)角色
1 10.0.0.12 數(shù)據(jù)庫(kù)主庫(kù)
2 10.0.0.16 數(shù)據(jù)庫(kù)從庫(kù)1
3,準(zhǔn)備好一個(gè)新的數(shù)據(jù)庫(kù)從庫(kù)2
編號(hào) IP地址 數(shù)據(jù)庫(kù)角色
3 10.0.0.14 數(shù)據(jù)庫(kù)從庫(kù)2
4,在新的數(shù)據(jù)庫(kù)從庫(kù)2,配置server_id=3,區(qū)別于上述2個(gè)節(jié)點(diǎn)
5,在數(shù)據(jù)庫(kù)從庫(kù)1,關(guān)閉sql thread,為了實(shí)現(xiàn)MYSQLDUMP備份的數(shù)據(jù)一致性;
mysql> system hostname
standby3
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
6,在數(shù)據(jù)庫(kù)從庫(kù)1,獲取show slave status之如下標(biāo)注的2個(gè)列
(注:用于基于這個(gè)列的值,用于后續(xù)構(gòu)建新的MYSQL從庫(kù))
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 10.0.0.12
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000002
Read_Master_Log_Pos: 120
Relay_Log_File: standby3-relay-bin.000004
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000002 ---應(yīng)用主庫(kù)二進(jìn)制日志
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: 120 ---應(yīng)用主庫(kù)二進(jìn)制日志的位置
Relay_Log_Space: 500
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: 1
Master_UUID: 65fddb9f-fd33-11e9-95f0-080027d1f3fc
Master_Info_File: /var/lib/mysql/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:
Auto_Position: 0
1 row in set (0.00 sec)
ERROR:
No query specified
mysql>
7,在MYSQL從庫(kù)1導(dǎo)出數(shù)據(jù)庫(kù)備份
[root@standby3 mysql]# mysqldump -uroot -psystem --databases zxydb >/dump_dir/for_create_2_slave.dump
Warning: Using a password on the command line interface can be insecure.
[root@standby3 mysql]#
8,重啟MYSQL從庫(kù)1的SQL THREAD
mysql> start slave sql_thread;
Query OK, 0 rows affected (0.01 sec)
9,把MYSQL從庫(kù)1 復(fù)制數(shù)據(jù)庫(kù)份到 MYSQL從庫(kù)2
[root@standby2mysql mysql]# mkdir -p /dump_dir
[root@standby2mysql mysql]#
[root@standby3 mysql]# scp /dump_dir/for_create_2_slave.dump root@10.0.0.14:/dump_dir/
root@10.0.0.14's password:
for_create_2_slave.dump 100% 2530 2.5KB/s 00:00
[root@standby3 mysql]#
10,在MYSQL從庫(kù)2導(dǎo)入DUMP文件
[root@standby2mysql mysql]# mysql -uroot -psystem </dump_dir/for_create_2_slave.dump
Warning: Using a password on the command line interface can be insecure.
[root@standby2mysql mysql]#
[root@standby2mysql mysql]# mysql -uroot -psystem
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.6.25-enterprise-commercial-advanced-log MySQL Enterprise Server - Advanced Edition (Commercial)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| zxydb |
+--------------------+
5 rows in set (0.00 sec)
11,在MYSQL主庫(kù)創(chuàng)建用于構(gòu)建MYSQL從庫(kù)2連接MYSQL主庫(kù)的復(fù)制數(shù)據(jù)庫(kù)用戶
mysql> create user 'repl'@'10.0.0.14' identified by 'system';
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication slave on *.* to 'repl'@'10.0.0.14';
Query OK, 0 rows affected (0.00 sec)
12,在MYSQL從庫(kù)2構(gòu)建至MYSQL主庫(kù)的主從復(fù)制關(guān)系
mysql> change master to master_host='10.0.0.12',master_user='repl',master_password='system',master_log_file='binlog.000002',master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.03 sec)
13,在MYSQL從庫(kù)2 啟動(dòng)主從復(fù)制服務(wù)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
14,在MYSQL從庫(kù)2查看主從復(fù)制運(yùn)行
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.0.0.12
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000002
Read_Master_Log_Pos: 437
Relay_Log_File: standby2mysql-relay-bin.000003
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000002
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
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: 437
Relay_Log_Space: 938
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: 0
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: 1
Master_UUID: 65fddb9f-fd33-11e9-95f0-080027d1f3fc
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
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:
Auto_Position: 0
1 row in set (0.00 sec)
ERROR:
No query specified
15,驗(yàn)證MYSQL主庫(kù)與新部署的MYSQL從庫(kù)2 數(shù)據(jù)同步正常
--MYSQL主庫(kù)
mysql> use zxydb;
Database changed
mysql> insert into t_go select 5,5;
Query OK, 1 row affected (0.01 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from t_go;
+---+------+
| a | b |
+---+------+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 5 | 5 |
+---+------+
4 rows in set (0.00 sec)
---MYSQL從庫(kù)2
mysql> select * from zxydb.t_go;
+---+------+
| a | b |
+---+------+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 5 | 5 |
+---+------+
4 rows in set (0.00 sec)
16,在MYSQL主庫(kù)執(zhí)行,可見(jiàn)現(xiàn)配置2個(gè)MYSQL從庫(kù)
mysql> show slave hosts;
+-----------+------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID |
+-----------+------+------+-----------+--------------------------------------+
| 3 | | 3306 | 1 | 699a379f-e36d-11e9-a4e2-0800274dcc79 |
| 2 | | 3306 | 1 | 891bc123-fd72-11e9-8cf5-080027dddbcd |
+-----------+------+------+-----------+--------------------------------------+
2 rows in set (0.00 sec)
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