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MySQL系列之十三 MySQL的復制

一、MySQL復制相關概念

主從復制：主節(jié)點將數(shù)據(jù)同步到多個從節(jié)點
級聯(lián)復制：主節(jié)點將數(shù)據(jù)同步到一個從節(jié)點，其他的從節(jié)點在向從節(jié)點復制數(shù)據(jù)
同步復制：將數(shù)據(jù)從主節(jié)點全部同步到從節(jié)點時才返回給用戶的復制策略叫同步復制
異步復制：只要數(shù)據(jù)寫入到主節(jié)點就立即返回給用戶同步完成
讀寫分離：在前端加一個調(diào)度器，負責將改變數(shù)據(jù)的語句和查詢數(shù)據(jù)的語句分開調(diào)度，把寫操作調(diào)度到主節(jié)點，讀操作調(diào)度到從節(jié)點

主節(jié)點：

dump Thread：為每個Slave的I/O Thread啟動一個dump線程，用于向其發(fā)送binary log events

從節(jié)點：

I/O Thread：向Master請求二進制日志事件，并保存于中繼日志中
SQL Thread：從中繼日志中讀取日志事件，在本地完成重放

跟復制功能相關的文件：

master.info：用于保存slave連接至master時的相關信息，例如賬號、密碼、服務器地址等
relay-log.info：保存在當前slave節(jié)點上已經(jīng)復制的當前二進制日志和本地replay log日志的對應關系

復制架構：

一主一從
一主多從
主主復制
環(huán)狀復制
級聯(lián)復制
多主一從

常見的架構有主從架構或者級聯(lián)架構

二、簡單的一主一從架構實現(xiàn)

1、新數(shù)據(jù)庫搭建主從架構

1）主服務器配置

~]# vim /etc/my.cnf
    [mysqld]
    log_bin
    binlog_format=ROW
    log-basename=master1
    server_id=1
~]# systemctl restart mariadb
~]# mysql
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO testuser@'192.168.0.8' IDENTIFIED BY 'testpass';  #授權同步賬戶
MariaDB [(none)]> SHOW MASTER LOGS;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| master1-bin.000001 |     26756 |
| master1-bin.000002 |    921736 |
| master1-bin.000003 |       401 |  #記錄此位置，從服務器從這里開始同步
+--------------------+-----------+

2）從服務器配置

~]# vim /etc/my.cnf
    [mysqld]
    server_id=2  #服務器ID唯一
    relay_log=relay-log
    relay_log_index=relay-log.index
    read_only=ON
~]# systemctl restart mariadb
~]# mysql
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',  #指定主節(jié)點IP
    -> MASTER_USER='testuser',  #同步用戶的用戶名
    -> MASTER_PASSWORD='testpass',  #密碼
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master1-bin.000003',  #以上記錄的文件
    -> MASTER_LOG_POS=401,  #位置
    -> MASTER_CONNECT_RETRY=10;  #重試時間10秒
MariaDB [(none)]> START SLAVE;  #開始主從復制

3）測試

在主節(jié)點上生成一些數(shù)據(jù)：
MariaDB [(none)]> CREATE DATABASE testdb;
MariaDB [(none)]> use testdb
MariaDB [testdb]> create table testlog (id int auto_increment primary key,name char(30),age int default 20);
MariaDB [testdb]> delimiter $$
MariaDB [testdb]> create procedure pro_testlog()
    -> begin
    -> declare i int;
    -> set i = 1;
    -> while i  100000
    -> do insert into testlog(name,age) values (concat('testuser',i),i);
    -> set i = i +1; 
    -> end while;
    -> end$$
MariaDB [testdb]> delimiter ;
MariaDB [testdb]> START TRANSACTION;
MariaDB [testdb]> CALL pro_testlog;
MariaDB [testdb]> COMMIT;

在從節(jié)點上查看同步情況：
MariaDB [(none)]> SELECT COUNT(*) FROM testdb.testlog;
+----------+
| COUNT(*) |
+----------+
|    99999 |  #同步成功
+----------+
MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ****************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.7
                  Master_User: testuser
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: master1-bin.000003
          Read_Master_Log_Pos: 10389814
               Relay_Log_File: relay-log.000002
                Relay_Log_Pos: 10389944
        Relay_Master_Log_File: master1-bin.000003
             Slave_IO_Running: Yes  #IO線程已啟動
            Slave_SQL_Running: Yes  #SQL線程已啟動
        Seconds_Behind_Master: 0    #主從復制的時間差
             Master_Server_Id: 1

2、舊數(shù)據(jù)庫新加從服務器

1）主服務器配置

~]# vim /etc/my.cnf
    [mysqld]
    log_bin
    binlog_format=ROW
    log-basename=master1
    server_id=1
~]# systemctl restart mariadb
~]# mysqldump -A -F --single-transaction --master-data=1 > full.sql
~]# scp full.sql root@192.168.0.8:/root/
~]# mysql -e 'GRANT REPLICATION SLAVE ON *.* TO testuser@'192.168.0.8' IDENTIFIED BY 'testpass';'

2）從服務器配置

~]# vim /etc/my.cnf
    [mysqld]
    server_id=2
    relay_log=relay-log   
    relay_log_index=relay-log.index
    read_only=ON
~]# systemctl restart mariadb
~]# vim full.sql  #在備份的SQL文件中加入以下信息
    CHANGE MASTER TO
    MASTER_HOST='192.168.0.7',
    MASTER_USER='testuser',
    MASTER_PASSWORD='testpass',
    MASTER_PORT=3306,
    MASTER_LOG_FILE='master1-bin.000005',
    MASTER_LOG_POS=245,
    MASTER_CONNECT_RETRY=10;
~]# mysql  full.sql  #導入SQL的同時配置已經(jīng)完成
MariaDB [(none)]> SELECT COUNT(*) FROM testdb.testlog;
+----------+
| COUNT(*) |
+----------+
|    99999 |
+----------+
MariaDB [(none)]> START SLAVE;  #啟動復制

三、級聯(lián)復制架構實現(xiàn)

1）主節(jié)點

[root@master ~]# vim /etc/my.cnf
[mysqld]
log_bin
binlog_format=ROW
log-basename=master
server_id=1
[root@master ~]# systemctl restart mariadb
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';
MariaDB [(none)]> SHOW MASTER LOGS;
+-------------------+-----------+
| Log_name          | File_size |
+-------------------+-----------+
| master-bin.000001 |     26753 |
| master-bin.000002 |    921736 |
| master-bin.000003 |       401 |
+-------------------+-----------+

2）從節(jié)點

[root@slave1 ~]# vim /etc/my.cnf
[mysqld]
log_bin  #注意，級聯(lián)架構中中繼從節(jié)點一定得開二進制日志功能
binlog_format=ROW
read_only=ON
server_id=2
log_slave_updates  #這項為關鍵，作用是將從服務的數(shù)據(jù)改變記錄到二進制日志文件中
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave1 ~]# systemctl start mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master-bin.000003',
    -> MASTER_LOG_POS=401,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;
MariaDB [(none)]> SHOW MASTER LOGS;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| mariadb-bin.000001 |       245 |
+--------------------+-----------+
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';

3）從節(jié)點的從節(jié)點

[root@slave2 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=3
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave2 ~]# systemctl start mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.8',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='mariadb-bin.000001',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;

4）從節(jié)點的從節(jié)點2

[root@slave3 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=4
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave3 ~]# systemctl start mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.8',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='mariadb-bin.000001',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;
到此已經(jīng)搭建好了級聯(lián)復制，接下來測試一下把~

四、主主復制架構

容易產(chǎn)生的問題：數(shù)據(jù)不一致，因此慎用；考慮要點：自動增長id
配置一個節(jié)點使用奇數(shù)id
auto_increment_offset=1 開始點
auto_increment_increment=2 增長幅度
另一個節(jié)點使用偶數(shù)id
auto_increment_offset=2
auto_increment_increment=2

1）主1

[mysqld]
log_bin
binlog_format=ROW
log-basename=master1
server_id=1
relay_log=relay-log
relay_log_index=relay-log.index
auto_increment_offset=1  #自增長字段從1開始
auto_increment_increment=2  #每次增長2，也就是說master1節(jié)點寫入的數(shù)據(jù)的id字段全部是奇數(shù)
[root@master ~]# systemctl start mariadb
MariaDB [(none)]> SHOW MASTER LOGS;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| master1-bin.000001 |     27033 |
| master1-bin.000002 |    942126 |
| master1-bin.000003 |       245 |
+--------------------+-----------+
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.8',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master2-bin.000003',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;

2）主2

[mysqld]
log_bin
binlog_format=ROW
log-basename=master2
server_id=2
relay_log=relay-log
relay_log_index=relay-log.index
auto_increment_offset=2  #自增長字段從1開始
auto_increment_increment=2  #每次增長2，也就是說master1節(jié)點寫入的數(shù)據(jù)的id字段全部是偶數(shù)
[root@master2 ~]# systemctl start mariadb
MariaDB [(none)]> SHOW MASTER LOGS;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| master2-bin.000001 |     27036 |
| master2-bin.000002 |    942126 |
| master2-bin.000003 |       245 |
+--------------------+-----------+
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master1-bin.000003',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;

3）測試

在master1上創(chuàng)建表，增加數(shù)據(jù)
MariaDB [(none)]> CREATE DATABASE db1;
MariaDB [(none)]> use db1
MariaDB [db1]> CREATE TABLE t1(id INT(2) AUTO_INCREMENT PRIMARY KEY,name CHAR(30));
MariaDB [db1]> INSERT t1(name) VALUES ('tom');
MariaDB [db1]> INSERT t1(name) VALUES ('maria'); 
MariaDB [db1]> SELECT * FROM t1;
+----+-------+
| id | name  |
+----+-------+
|  1 | tom   |
|  3 | maria |
+----+-------+
在master2上增加數(shù)據(jù)
MariaDB [db1]> INSERT t1(name) VALUES ('jerry');
MariaDB [db1]> INSERT t1(name) VALUES ('tony'); 
MariaDB [db1]> SELECT * FROM t1;
+----+-------+
| id | name  |
+----+-------+
|  1 | tom   |
|  3 | maria |
|  4 | jerry |
|  6 | tony  |

五、半同步復制的實現(xiàn)

默認情況下，MySQL的復制功能是異步的，異步復制可以提供最佳的性能，主庫把binlog日志發(fā)送給從庫即結束，并不驗證從庫是否接收完畢。這意味著當主服務器或從服務器端發(fā)生故障時，有可能從服務器沒有接收到主服務器發(fā)送過來的binlog日志，這就會造成主服務器和從服務器的數(shù)據(jù)不一致，甚至在恢復時造成數(shù)據(jù)的丟失；半同步復制的機制是只有當主節(jié)點和從節(jié)點同步完成，僅有一臺同步完成即可，返回寫入完成，這樣的機制保證了數(shù)據(jù)的安全性。

1）主節(jié)點

[root@master ~]# vim /etc/my.cnf
[mysqld]
log_bin
binlog_format=ROW
log-basename=master
server_id=1
relay_log=relay-log
relay_log_index=relay-log.index
[root@master ~]# systemctl restart mariadb
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';
MariaDB [(none)]> SHOW MASTER LOGS;
+-------------------+-----------+
| Log_name          | File_size |
+-------------------+-----------+
| master-bin.000001 |     26753 |
| master-bin.000002 |    921736 |
| master-bin.000003 |       401 |
+-------------------+-----------+
MariaDB [(none)]> INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';  #安裝模塊
MariaDB [(none)]> SET GLOBAL rpl_semi_sync_master_enabled=1;  #開啟半同步功能
MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE '%semi%';
+------------------------------------+-------+
| Variable_name                      | Value |
+------------------------------------+-------+
| rpl_semi_sync_master_enabled       | ON    |  #已開啟
| rpl_semi_sync_master_timeout       | 10000 |
| rpl_semi_sync_master_trace_level   | 32    |
| rpl_semi_sync_master_wait_no_slave | ON    |
+------------------------------------+-------+
MariaDB [(none)]> SHOW GLOBAL STATUS LIKE '%semi%';
+--------------------------------------------+-------+
| Variable_name                              | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients               | 0     |
| Rpl_semi_sync_master_net_avg_wait_time     | 0     |
| Rpl_semi_sync_master_net_wait_time         | 0     |
| Rpl_semi_sync_master_net_waits             | 0     |
| Rpl_semi_sync_master_no_times              | 0     |
| Rpl_semi_sync_master_no_tx                 | 0     |
| Rpl_semi_sync_master_status                | ON    |
| Rpl_semi_sync_master_timefunc_failures     | 0     |
| Rpl_semi_sync_master_tx_avg_wait_time      | 0     |
| Rpl_semi_sync_master_tx_wait_time          | 0     |
| Rpl_semi_sync_master_tx_waits              | 0     |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0     |
| Rpl_semi_sync_master_wait_sessions         | 0     |
| Rpl_semi_sync_master_yes_tx                | 0     |
+--------------------------------------------+-------+

2）從節(jié)點1

[root@slave1 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
log_bin
binlog_format=ROW
log-basename=slave
server_id=2
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave1 ~]# systemctl restart mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master-bin.000003',
    -> MASTER_LOG_POS=401,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
MariaDB [(none)]> SET GLOBAL rpl_semi_sync_slave_enabled=1;
MariaDB [(none)]> START SLAVE;
MariaDB [(none)]> SHOW MASTER LOGS;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| slave-bin.000001 |     26753 |
| slave-bin.000002 |    921736 |
| slave-bin.000003 |       245 |
+------------------+-----------+
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass';

3）從節(jié)點2

[root@slave2 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=3
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave2 ~]# systemctl restart mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.8',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='slave-bin.000003',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;

4）從節(jié)點3

[root@slave3 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=4
relay_log=relay-log
relay_log_index=relay-log.index
[root@slave3 ~]# systemctl restart mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.8',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='slave-bin.000003',
    -> MASTER_LOG_POS=245,
    -> MASTER_CONNECT_RETRY=10;
MariaDB [(none)]> START SLAVE;

六、加密傳輸復制的實現(xiàn)

在默認的主從復制過程或遠程連接到MySQL/MariaDB所有的鏈接通信中的數(shù)據(jù)都是明文的，外網(wǎng)里訪問數(shù)據(jù)或則復制，存在安全隱患。通過SSL/TLS加密的方式進行復制的方法，來進一步提高數(shù)據(jù)的安全性

主服務器開啟SSL：[mysqld] 加一行ssl
主服務器配置證書和私鑰；并且創(chuàng)建一個要求必須使用SSL連接的復制賬號
從服務器使用CHANGER MASTER TO 命令時指明ssl相關選項

MariaDB [(none)]> SHOW VARIABLES LIKE '%ssl%';
+---------------+----------+
| Variable_name | Value    |
+---------------+----------+
| have_openssl  | DISABLED |
| have_ssl      | DISABLED |
| ssl_ca        |          |
| ssl_capath    |          |
| ssl_cert      |          |
| ssl_cipher    |          |
| ssl_key       |          |
+---------------+----------+
特別提示：在配置之前先檢查mysql服務是否支持ssl功能，如果have_ssl的值為'DISABLED'則支持；如果為'NO'則不支持，需要再重新編譯安裝或者安裝具有ssl功能的版本

1）CA

[root@CA ~]# mkdir /etc/my.cnf.d/ssl/
[root@CA ~]# cd /etc/my.cnf.d/ssl/
[root@CA ssl]# openssl genrsa 2048 > cakey.pem
[root@CA ssl]# openssl req -new -x509 -key cakey.pem -out cacert.pem -days 3650 #自簽證書
    Country Name (2 letter code) [XX]:CN
    State or Province Name (full name) []:beijing
    Locality Name (eg, city) [Default City]:beijing
    Organization Name (eg, company) [Default Company Ltd]:testmysqlca 
    Organizational Unit Name (eg, section) []:opt
    Common Name (eg, your name or your server's hostname) []:ca.testmysqlca.com

[root@CA ssl]# openssl req -newkey rsa:2048 -days 365 -nodes -keyout master.key > master.csr
    Country Name (2 letter code) [XX]:CN
    State or Province Name (full name) []:beijing
    Locality Name (eg, city) [Default City]:beijing
    Organization Name (eg, company) [Default Company Ltd]:testmysqlca
    Organizational Unit Name (eg, section) []:opt
    Common Name (eg, your name or your server's hostname) []:master.testmysqlca.com
[root@CA ssl]# openssl x509 -req -in master.csr -CA cacert.pem -CAkey cakey.pem -set_serial 01 > master.crt #簽署master證書

[root@CA ssl]# openssl req -newkey rsa:2048 -days 365 -nodes -keyout slave.key > slave.csr
    Country Name (2 letter code) [XX]:CN
    State or Province Name (full name) []:beijing
    Locality Name (eg, city) [Default City]:beijing
    Organization Name (eg, company) [Default Company Ltd]:testmysqlca 
    Organizational Unit Name (eg, section) []:opt
    Common Name (eg, your name or your server's hostname) []:slave.testmysqlca.com
[root@CA ssl]# openssl x509 -req -in slave.csr -CA cacert.pem -CAkey cakey.pem -set_serial 02 > slave.crt #簽署slave證書

[root@CA ssl]# openssl req -newkey rsa:2048 -days 365 -nodes -keyout slave2.key > slave2.csr
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:beijing
Locality Name (eg, city) [Default City]:beijing
Organization Name (eg, company) [Default Company Ltd]:testmysqlca
Organizational Unit Name (eg, section) []:opt
Common Name (eg, your name or your server's hostname) []:slave2.testmysqlca.com
[root@CA ssl]# openssl x509 -req -in slave2.csr -CA cacert.pem -CAkey cakey.pem -set_serial 03 > slave2.crt #簽署slave2證書

[root@CA ssl]# openssl verify -CAfile cacert.pem master.crt slave.crt slave2.crt #檢查證書是否可用
master.crt: OK
slave.crt: OK
slave2.crt: OK
先在各個節(jié)點上創(chuàng)建/etc/my.cnf.d/ssl/文件夾，將各自的證書，CA的證書和各自的秘鑰文件復制過去
[root@CA ssl]# scp cacert.pem master.crt master.key root@192.168.0.7:/etc/my.cnf.d/ssl/
[root@CA ssl]# scp cacert.pem slave.crt slave.key root@192.168.0.8:/etc/my.cnf.d/ssl/ 
[root@CA ssl]# scp cacert.pem slave2.crt slave2.key root@192.168.0.9:/etc/my.cnf.d/ssl/

2）master

[root@master ~]# mkdir /etc/my.cnf.d/ssl/
[root@master ~]# vim /etc/my.cnf
[mysqld]
log_bin
binlog_format=ROW
log-basename=master
server_id=1
ssl #開啟ssl功能
ssl-ca=/etc/my.cnf.d/ssl/cacert.pem #指定CA證書的路徑
ssl-cert=/etc/my.cnf.d/ssl/master.crt #指定自己的證書的路徑
ssl-key=/etc/my.cnf.d/ssl/master.key #指定自己的秘鑰文件路徑
[root@master ~]# systemctl restart mariadb
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO repluser@'192.168.0.%' IDENTIFIED BY 'replpass' REQUIRE SSL; #授權用戶并且強制迫使用戶開啟ssl登錄
MariaDB [(none)]> SHOW MASTER LOGS;
+-------------------+-----------+
| Log_name          | File_size |
+-------------------+-----------+
| master-bin.000001 |     26753 |
| master-bin.000002 |    921736 |
| master-bin.000003 |       413 |
+-------------------+-----------+

3）slave1

[root@slave1 ~]# mkdir /etc/my.cnf.d/ssl/
[root@slave1 ~]# mysql -urepluser -preplpass -h192.168.0.7 --ssl-ca=/etc/my.cnf.d/ssl/cacert.pem --ssl-cert=/etc/my.cnf.d/ssl/slave.crt --ssl-key=/etc/my.cnf.d/ssl/slave.key
[root@slave1 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=2
relay_log=relay-log
relay_log_index=relay-log.index
ssl
ssl-ca=/etc/my.cnf.d/ssl/cacert.pem
ssl-cert=/etc/my.cnf.d/ssl/slave.crt
ssl-key=/etc/my.cnf.d/ssl/slave.key
[root@slave1 ~]# systemctl restart mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master-bin.000003',
    -> MASTER_LOG_POS=413,
    -> MASTER_CONNECT_RETRY=10,
    -> MASTER_SSL=1;  #注意，需要指明開啟ssl鏈接
MariaDB [(none)]> START SLAVE;

4）slave2

[root@slave2 ~]# mkdir /etc/my.cnf.d/ssl/
[root@slave2 ~]# mysql -urepluser -preplpass -h192.168.0.7 --ssl-ca=/etc/my.cnf.d/ssl/cacert.pem --ssl-cert=/etc/my.cnf.d/ssl/slave2.crt --ssl-key=/etc/my.cnf.d/ssl/slave2.key
[root@slave2 ~]# vim /etc/my.cnf
[mysqld]
read_only=ON
server_id=3
relay_log=relay-log
relay_log_index=relay-log.index
ssl
ssl-ca=/etc/my.cnf.d/ssl/cacert.pem
ssl-cert=/etc/my.cnf.d/ssl/slave2.crt
ssl-key=/etc/my.cnf.d/ssl/slave2.key
[root@slave2 ~]# systemctl restart mariadb
MariaDB [(none)]> CHANGE MASTER TO
    -> MASTER_HOST='192.168.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='replpass',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='master-bin.000003',
    -> MASTER_LOG_POS=413,
    -> MASTER_CONNECT_RETRY=10,
    -> MASTER_SSL=1;
MariaDB [(none)]> START SLAVE;

七、MySQL復制的相關指令和變量總結

選項：

log_bin 啟用二進制日志，在主節(jié)點或級聯(lián)復制中間的從節(jié)點必須要開啟
binlog_format=ROW 二進制日志記錄方式為基于行的方式記錄，強烈建議開啟
log-basename=master | slave ... 二進制日志的前綴名，不是必須向，但建議標識
server_id = # 服務器ID，各個節(jié)點的ID必須唯一
relay_log = relay-log 開啟中繼日志，并以relay-log為文件名開頭，從節(jié)點開啟
relay_log_index = relay-log.index 中繼日志索引文件
log_slave_updates 作用是SQL線程重讀中繼日志時將改變數(shù)據(jù)的操作記錄為二進制日志，在級聯(lián)復制中使用
ssl 開啟ssl功能
- ssl-ca=/etc/my.cnf.d/ssl/cacert.pem
- ssl-cert=/etc/my.cnf.d/ssl/master.crt
- ssl-key=/etc/my.cnf.d/ssl/master.key
sync_binlog=1 每次寫后立即同步二進制日志到磁盤
- innodb_flush_log_at_trx_commit=1 每次事務提交立即同步日志寫磁盤
- sync_master_info=# #次事件后master.info同步到磁盤
skip_slave_start=ON 不自動啟動slave
sync_relay_log=# #次寫后同步relay log到磁盤
sync_relay_log_info=# #次事務后同步relay-log.info到磁盤
auto_increment_offset=1 自動增長開始點，在主主復制中使用

變量：

replicate_do_db= 指定復制庫的白名單
replicate_ignore_db= 指定復制庫黑名單
replicate_do_table= 指定復制表的白名單
replicate_ignore_table= 指定復制表的黑名單
replicate_wild_do_table= foo%.bar% 支持通配符
replicate_wild_ignore_table= 指定復制的表，黑名單
rpl_semi_sync_slave_enabled=1 開啟半同步復制，需要安裝模塊

指令：

START SLAVE; 啟動主從復制
STOP SLAVE; 停止復制
SHOW SLAVE STATUS; 查看復制狀態(tài)
- Seconds_Behind_Master: 0 從服務器是否落后于主服務
RESET SLAVE ALL; 重置從服務器的配置
MASTER_SSL=1, 配合 CHANGE MASTER TO 使用，開啟ssl加密復制
- MASTER_SSL_CA = '/etc/my.cnf.d/ssl/cacert.pem',
- MASTER_SSL_CERT = '/etc/my.cnf.d/ssl/slave.crt',
- MASTER_SSL_KEY = '/etc/my.cnf.d/ssl/slave.key';
PURGE { BINARY | MASTER } LOGS { TO 'log_name' | BEFORE datetime_expr } 刪除二進制日志，謹慎操作
SHOW MASTER STATUS 查看二進制日志狀態(tài)
SHOW BINLOG EVENTS 查看二進制日志
SHOW BINARY LOGS 查看二進制日志

到此這篇關于MySQL系列之十三 MySQL的復制的文章就介紹到這了,更多相關MySQL的復制內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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標簽：三明無錫山西福州揚州溫州阿里定西

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