MariaDB半同步測試

時間  2019-11-06
標籤 mariadb 同步 測試 简体版
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MariaDB半同步測試

環境：

  • 192.168.205.17: as master server
  • 192.168.205.27: as slave server
  • 192.168.205.37: as slave server

版本：

  • OS: centos 7 1810 with mini install
  • mariadb-5.5.60

目地：

默認狀況下，MySQL的複製功能是異步的，異步複製能夠提供最佳的性能，主庫把binlog日誌發送給從庫即結束，並不驗證從庫是否接收完畢。這意味着當主服務器或從服務器端發生故障時，有可能從服務器沒有接收到主服務器發送過來的binlog日誌，這就會形成主服務器和從服務器的數據不一致，甚至在恢復時形成數據的丟失, 半同步解決了性能和數據安全綜合，在同步從服務器時只要有一個從服務器確認同步完成，即返回結果，不用等到所有複製完成，這樣解決了數據同步複製時要等全部從服務器返回結果，實現了最佳性能和數據安全的結合mysql

步驟：

  1. 安裝數據庫在全部服務器，初始化運行如下腳本 
    [root@master ~]#cat /data/maridb_yum.sh 
rpm -q mariadb-server ||yum install -y mariadb-server
mkdir /data/{mysql,logs}
chown mysql:mysql /data/{mysql,logs}
sed -i '/\[mysqld\]/a log-bin=/data/logs/bin' /etc/my.cnf
sed -i '/\[mysqld\]/a innodb_file_per_table = on' /etc/my.cnf
sed -i '/\[mysqld\]/a skip_name_resolve = on' /etc/my.cnf
sed -i 's@(datadir=).*@\1/data/mysql@' /etc/my.cnf
  2. 修改配置文件 
    [root@master ~]#vi /etc/my.cnf
[mysqld]
server-id=17
[root@slave1 ~]#vi /etc/my.cnf
[mysqld]
server-id=27    
[root@slave2 ~]#vi /etc/my.cnf
[mysqld]
server-id=37
  3. 主服務器上創建同步賬號及，記錄位置或備份主服器恢復從服務器二選一 
    MariaDB [(none)]> grant replication slave on *.* to repluser@'192.168.205.%' identified by 'centos';
MariaDB [(none)]> show master logs;                                                                 
+------------+-----------+
| Log_name   | File_size |
+------------+-----------+
| bin.000001 |     30373 |
| bin.000002 |   1038814 |
| bin.000003 |       406 |
+------------+-----------+
3 rows in set (0.00 sec)

  4. 從服務器上修改change master to，並啓用slavesql

    MariaDB [(none)]> CHANGE MASTER TO 
    -> MASTER_HOST='192.168.205.17', 
    -> MASTER_USER='repluser', 
    -> MASTER_PASSWORD='centos', 
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='bin.000003', 
    -> MASTER_LOG_POS=406; 
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.205.17
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: bin.000003
          Read_Master_Log_Pos: 406
               Relay_Log_File: mariadb-relay-bin.000002
                Relay_Log_Pos: 523
        Relay_Master_Log_File: bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
  5. 要啓用主從的半同步複製須要安裝一個插件 
    [root@centos7 data]#rpm -ql mariadb-server
/usr/lib64/mysql/plugin/semisync_master.so
/usr/lib64/mysql/plugin/semisync_slave.so
  6. 在數據庫中能夠查看那些插件安裝 
    MariaDB [(none)]> show plugins;
  7. 在主服務器上安裝插件 
    MariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show plugins;
…
| rpl_semi_sync_master           | ACTIVE   | REPLICATION        | semisync_master.so | GPL     |
+--------------------------------+----------+--------------------+--------------------+---------+
43 rows in set (0.00 sec)
  8. 查看半同步的狀態 
    MariaDB [(none)]> show global variables like '%semi%' ;
+------------------------------------+-------+
| Variable_name                      | Value |
+------------------------------------+-------+
| rpl_semi_sync_master_enabled       | OFF   | #半同步默認off
| rpl_semi_sync_master_timeout       | 10000 | #超時毫秒，10秒
| rpl_semi_sync_master_trace_level   | 32    |
| rpl_semi_sync_master_wait_no_slave | ON    |
+------------------------------------+-------+
4 rows in set (0.00 sec)
  9. 啓用半同步 
    MariaDB [(none)]> set global rpl_semi_sync_master_enabled=on;
Query OK, 0 rows affected (0.00 sec)
  10. 查看半同步狀態信息 
    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     |
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
  11. 在全部的從節點安裝slave semi插件； 
    MariaDB [(none)]>  install plugin rpl_semi_sync_slave soname 'semisync_slave.so';       
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show plugins;
…
| rpl_semi_sync_slave            | ACTIVE   | REPLICATION        | semisync_slave.so | GPL     |
+--------------------------------+----------+--------------------+-------------------+---------+
43 rows in set (0.00 sec)

  12. 查看slave的半同步狀態，並啓用，並須要從新啓動線程，再查看半同步狀態是on才能夠數據庫

    MariaDB [(none)]> show global variables like '%semi%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| rpl_semi_sync_slave_enabled     | OFF   |
| rpl_semi_sync_slave_trace_level | 32    |
+---------------------------------+-------+
2 rows in set (0.00 sec)
MariaDB [(none)]> set global rpl_semi_sync_slave_enabled=on; 
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show global variables like '%semi%';      
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| rpl_semi_sync_slave_enabled     | ON    |
| rpl_semi_sync_slave_trace_level | 32    |
+---------------------------------+-------+
2 rows in set (0.00 sec)
MariaDB [(none)]> stop slave;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show global status like '%semi%';  
+----------------------------+-------+
| Variable_name              | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON    |
+----------------------------+-------+
1 row in set (0.00 sec)
  13. 此時查看主節點的狀態 
    MariaDB [(none)]> show global status like '%semi%';
+--------------------------------------------+-------+
| Variable_name                              | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients               | 2     |
| 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     |
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
  14. 測試，在主節點上建立一個庫 
    MariaDB [(none)]> create database db1;
Query OK, 1 row affected (0.00 sec)
  15. 在從節點上能夠看到同步 
    MariaDB [(none)]> show databases;     
+--------------------+
| Database           |
+--------------------+
| information_schema |
| db1                |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.00 sec)
  16. 此進咱們把slave1停掉,在主節點建立數據庫，顯示能夠成功, 只會複製到slave2節點上 
    [root@slave1 ~]#systemctl stop mariadb
MariaDB [(none)]> create database db2; 
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| db1                |
| db2                |
| mysql              |
| performance_schema |
| test               |
+--------------------+
6 rows in set (0.00 sec)
  17. 若是所有停掉從節點，再從主節點建立數據庫，會等10秒纔會顯示成功 
    [root@slave2 ~]#systemctl stop mariadb;
MariaDB [(none)]> create database db3;
Query OK, 1 row affected (10.00 sec)
  18. 將兩個服務器再從新啓動後，查看數據也會同步 
    [root@slave1 ~]#systemctl start mariadb 
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| db1                |
| db2                |
| db3                |
| mysql              |
| performance_schema |
| test               |
+--------------------+
7 rows in set (0.00 sec)
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