CentOS之MYSQL主從同步配置,centosmysql主從

來源:互聯網
上載者:User

CentOS之MYSQL主從同步配置,centosmysql主從

一、主機master與salver均關閉防火牆iptables,執行service iptables stop命令:


設定SELINUX檔案的SELINUX=disabled,:

二、建立資料庫

分別登入master機和slave機的mysql:mysql –u root –p

建立資料庫:create database repl;


在/usr/local/mysql目錄下建立MYSQL複製的日誌設定檔/usr/local/mysql/mysql-bin.log並賦予許可權以及改變檔案的所有者:

                      [root@master mysql] touch mysql-bin.log

                      [root@master mysql] chmod 755 mysql-bin.log

                      [root@master mysql] chown -R mysql:mysql .

1、修改master機器中mysql設定檔my.cnf,該檔案在/etc目錄下

在[mysqld]配置段添加如下欄位

server-id=1

log-bin=log

binlog-do-db=repl //需要同步的資料庫,如果沒有本行,即表示同步所有的資料庫

binlog-ignore-db=mysql //被忽略的資料庫


在master機上為slave機添加一同步帳號
grant replication slave on *.* to 'repl'@'192.1681.220' identifiedby '123456';


重啟master機的mysql服務:service mysqld restart


用show master status 命令看日誌情況

mysql>show master status;

+-----------------+------------+-------------------+-----------------------+

|File               |Position    | Binlog_Do_DB   |Binlog_Ignore_DB |

+-----------------+------------+-------------------+-----------------------+

|   log.000003|          98  |repl                |mysql                   |

+-----------------+------------+-------------------+-----------------------+

1 row in set (0.00 sec)



在主機master上添加主機salver的同步帳號:

                      mysql> grant replication slave on *.* to'slave'@'192.168.31.137' identified by 'admin';

                      執行如下命令查看:


在[mysqld]配置段添加如下欄位

server-id=1

log-bin=log

binlog-do-db=repl //需要同步的資料庫,如果沒有本行,即表示同步所有的資料庫

binlog-ignore-db=mysql //被忽略的資料庫

                      在檔案中添加如下屬性項:

                      log-bin = /usr/local/mysql/mysql-bin.log

                      binlog-ignore-db=mysql

                      binlog-ignore-db=information_schema




在master機上為slave機添加一同步帳號
grant replication slave on *.* to 'repl'@'192.1681.220' identifiedby '123456';


重啟master機的mysql服務:service mysqld restart


s

select user.host from mysql.user

 可以看見備份賬戶以及設定完成。下面對資料庫表加鎖唯讀。

mysql鎖表唯讀(其他賬戶登入mysql後無法進行寫表操作,防止備份資料庫後,主mysql表更新,導致和從資料庫內容不一致)


mysql> flush tables with read lock;

                E:查看狀態:

                      [root@master mysql] mysql -u root -padmin -e "show master status"

註:File欄位的日誌名稱(mysql-bin.000001)就是從機備份所需要的記錄檔。




2、修改slave機中mysql設定檔

解鎖資料庫:

                      mysql> unlock tables;


同樣在[mysqld]欄位下添加如下內容

server-id=2


這裡開始

master-host=192.168.1.222

master-user=repl

master-password=123456

master-port=3306

master-connect-retry=60

到這裡結束,這些參數不能在配置在資料庫中 5.1以後的mysql,只能命令

replicate-do-db=repl //同步的資料庫,不寫本行 表示 同步所有資料庫


注意事項(出現錯誤)
Mysql版本從5.1.7以後開始就不支援“master-host”類似的參數
在從庫上執行如下命令;
change master to master_host='masterIP', master_user='slave', master_password='slvaePASS';

change master to master_host='10.171.244.109',

                                                                       master_user='slave',

                                                                       master_password='admin',

                                                                       master_log_file="mysql-bin.000006",

                                                                       master_log_pos=107 ;



然後重啟slave機的mysql


在slave機中進入mysql

mysql>start slave;

mysql>show slave statusG;
如果Slave_IO_Running、Slave_SQL_Running狀態為Yes則表明設定成功。



四、出現的問題

問題1 當我在執行start slave這條命令時,系統提示

ERROR 1200 (HY000): The server is not configured as slave; fixin config file or with CHANGE MASTER TO,

執行show slave status;又提示Empty set (0.00 sec),想不通問題在哪裡

 

或問題2 Slave_SQL_Running: No


後來發現,原來slave已經預設開啟,要先關閉再開啟

執行 slave stop;

再執行

change master tomaster_host='192.168.1.222',master_user='repl',master_password='123456',master_log_file='log.000003' ,master_log_pos=98;

然後執行 slave start;

這時 再執行show slave statusG

顯示如下:

*************************** 1. row***************************

            Slave_IO_State: Waiting for master to send event

               Master_Host: 192.168.1.222

               Master_User: repl

               Master_Port: 3306

             Connect_Retry: 60

           Master_Log_File: log.000003

       Read_Master_Log_Pos: 98

           Relay_Log_File: mysqld-relay-bin.000002

             Relay_Log_Pos: 229

     Relay_Master_Log_File: log.000003

          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: 98

           Relay_Log_Space: 229

           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

1 row in set (0.00 sec)

顯示紅色那兩行,說明配置成功。

 

 

 

五、測試主從伺服器是否能同步

在主伺服器上面建立一個表,必須在repl資料下

mysql> use repl

Database changed

mysql> create table test(id int,namechar(10));

Query OK, 0 rows affected (0.00 sec)


mysql> insert into test values(1,'zaq');

Query OK, 1 row affected (0.00 sec)


mysql> insert into test values(1,'xsw');

Query OK, 1 row affected (0.00 sec)


mysql> select * from test;

+------+------+

| id    |name |

+-------+------+

|   1    |zaq   |

|   1    | xsw |

+-------+------+

2 rows in set (0.00 sec)

 


在從伺服器查看是否同步過來

mysql> use repl;

Database changed

mysql> select * from test;

+------+------+

| id    |name |

+------+------+

|    1 | zaq   |

|    1 | xsw |

+------+------+

2 rows in set (0.00 sec)





flush privileges;
然後
show grants for 'slave'@'10.169.6.133';

登入資料庫遇到
遇到 ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
重啟 service mysql restart

錯誤:Starting MySQL..The server quit without updating PID file ([FAILED]al/mysql/data/iZ23xrasgttZ.pid).
解決方式:
刪除 /etc/mysql檔案夾
並且修改設定檔中的mstart項 注釋掉

注意事項(出現錯誤)
Mysql版本從5.1.7以後開始就不支援“master-host”類似的參數
在從庫上執行如下命令;
change master to master_host='masterIP', master_user='slave', master_password='slvaePASS';

change master to master_host='10.171.244.109',

                                                                       master_user='slave',

                                                                       master_password='admin',

                                                                       master_log_file="mysql-bin.000006",

                                                                       master_log_pos=107 ;
                                                                       
前面參考網址:


http://blog.csdn.net/sxhong/article/details/9212109   (CentOS下設定MySQL的root密碼 )

http://blog.csdn.net/limingzhong198/article/details/20578821     (CentOS下MYSQL資料庫的主從備份配置 )

後面參考網址:
http://blog.sina.com.cn/s/blog_6eb46a7e0100wmph.html   (centos下MySQL主從同步配置)

http://bbs.csdn.net/topics/380252598     (錯誤處理)

mysql錯誤記錄檔一般是mysql安裝目錄下的data目錄下

相關文章

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.