MySQL Replication配置

時間 2019-11-10

原文原文鏈接

[toc]java

MySQL Replication配置

1、MySQL主從介紹

MySQL主從又叫作Replication、AB複製。簡單講就是A和B兩臺機器作主從後，在A上寫數據，另一臺B也會跟着寫數據，二者數據實時同步；mysql

MySQL主從是基於binlog的，主上須開啓binlog才能進行主從；linux

主從過程大體有3個步驟：nginx

1）主將更改操做記錄到binlog裏sql

2）從將主的binlog事件（sql語句）同步到從本機上並記錄在relaylog裏數據庫

3）從根據relaylog裏面的sql語句按順序執行
主上有一個logvim

dump線程，用來和從的I/O線程傳遞binlong；bash

從上有兩個線程，其中I/O線程用來同步主的binlog並生成relaylog，另一個sql線程用來把relaylog裏面的sql語句落地。服務器

原理圖

2、mysql編譯安裝：

cd /usr/local/src

wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz 

tar zxvf mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz

mv mysql-5.6.36-linux-glibc2.5-x86_64 /usr/local/mysql

cd /usr/local/mysql

useradd mysql

mkdir -p /data/mysql

chown -R mysql:mysql /data/mysql

./scripts/mysql_install_db --user=mysql --datadir=/data/mysql

運行出現兩個OK後

cp support-files/my-default.cnf  /etc/my.cnf

vim /etc/my.cnf
 basedir =/usr/local/mysql
 datadir =/data/mysql
 port =3306
 server_id =128
 socket =/tmp/mysql.sock
 log_bin=xavilinux01
# Remove leading # to set options mainly useful for reporting servers.
:wq 

cp support-files/mysql.server /etc/init.d/mysqld

正常操做是沒有問題，可是也發現了錯誤socket

[root@xavilinux mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
-bash: ./scripts/mysql_install_db: No such file or directory

這個問題處理了好久，沒有思路，左後想起查看下當前的mysql路徑下有哪些文件，才找到錯誤的地方是裏面的srcipts目錄，是本身建立的，裏面是空的

[root@xavilinux mysql]# ls
scripts
[root@xavilinux mysql]# cd /usr/local/src
[root@xavilinux src]# ls
mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz  nginx-1.12.1
[root@xavilinux src]# tar zxvf mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz
tar (child): mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
[root@xavilinux src]# cd /usr/local/mysql
[root@xavilinux mysql]# ls
bin  COPYING  data  docs  include  lib  man  mysql-test  README  scripts  share  sql-bench  support-files

再次報錯：

[root@xavilinux mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
Installing MySQL system tables..../bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory

緣由：缺乏libaio庫文件

解決方法：yum install libaio* -y

在兩臺服務器上完成了mysql的安裝和配置

vim /etc/my.cnf

vim /etc/init.d/mysqld

[root@xavilinux ~]# /etc/init.d/mysqld start
/etc/init.d/mysqld: line 46: /usr/local/mysql: Is a directory
/etc/init.d/mysqld: line 47: /data/mysql: Is a directory
Starting MySQL.Logging to '/data/mysql/xavilinux.err'.
                                                           [  OK  ]

出現mysql沒法啓動，報錯的狀況

1.有可能開了java別的服務佔用端口，lsof -i :80查看端口狀況，將佔用的服務關閉

[root@xavi ~]# lsof -i :80
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME

2. 從錯誤日誌入手看下報錯緣由

[root@xavi ~]# /etc/init.d/mysqld start
Starting MySQL... ERROR! The server quit without updating PID file (/data/mysql/xavi.pid).

[root@xavi ~]# ls -l /data/mysql
總用量 110720
-rw-rw---- 1 mysql mysql       56 3月  13 22:17 auto.cnf
drwx------ 2 mysql mysql       20 3月  23 22:17 db2
-rw-rw---- 1 mysql mysql 12582912 4月   6 15:53 ibdata1
-rw-rw---- 1 mysql mysql 50331648 4月   6 15:53 ib_logfile0
-rw-rw---- 1 mysql mysql 50331648 3月  13 22:11 ib_logfile1
drwx------ 2 mysql mysql     4096 3月  13 22:11 mysql
drwx------ 2 mysql mysql     4096 3月  24 09:55 mysql2
drwx------ 2 mysql mysql     4096 3月  13 22:11 performance_schema
drwx------ 2 mysql mysql        6 3月  13 22:11 test
-rw-rw---- 1 mysql mysql   114094 4月   6 15:53 xavi.err
drwx------ 2 mysql mysql      324 3月  31 15:49 zrlog

查看錯誤日誌

[root@xavi mysql]# tail xavi.err
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'CSV'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'MEMORY'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'MyISAM'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'MRG_MYISAM'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'sha256_password'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'mysql_old_password'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'mysql_native_password'
2018-04-06 16:08:43 7318 [Note] Shutting down plugin 'binlog'
2018-04-06 16:08:43 7318 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

[root@xavi mysql]# /etc/init.d/mysqld start
Starting MySQL. SUCCESS!

## 3、配置主機

### 3.1 修改my.cnf，增長server-id=130和log_bin=xavilinux1

![mark](http://p0weeraap.bkt.clouddn.com/xavi2017/180405/GlG0GJI3f9.png?imageslim)

[mysqld]
datadir=/data/mysql
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
symbolic-links=0

server_id =130
log_bin=xavilinux

### 3.2 修改完配置文件後，啓動或者重啓mysqld服務

[root@xavi ~]# vim /etc/my.cnf
[root@xavi ~]# /etc/init.d/mysqld restart
Shutting down MySQL.. SUCCESS!
Starting MySQL. SUCCESS!

* 生成了兩個重要文件，前綴名爲xavilinux1，這是實現主從的根本。000001是二進制日誌文件，index是索引。
![mark](http://p0weeraap.bkt.clouddn.com/xavi2017/180405/c70Kl3EA7A.png?imageslim)

### 3.3 備份以前blog的全部的數據（測試用）

[root@xavi mysql]# mysqldump -uroot -pxavilinux blog > /tmp/blog.sql
Warning: Using a password on the command line interface can be insecure.
[root@xavi mysql]# du -sh /tmp/blog.sql
4.0K /tmp/blog.sql

### 3.4 建立一個新庫把以前的備份數據恢復

[root@xavi mysql]# mysql -uroot -pxavilinux -e "create database xavi"
Warning: Using a password on the command line interface can be insecure.
[root@xavi mysql]# mysql -uroot -pxavilinux xavi < /tmp/blog.sql
Warning: Using a password on the command line interface can be insecure.

### 3.5 建立用做同步數據的用戶

[root@xavi mysql]# mysql -uroot -pxavilinux

mysql> grant replication slave on . to 'repl'@'192.168.72.133' identified by 'xavilinux111'; //密碼是主機登入密碼？？
Query OK, 0 rows affected (0.00 sec)

#### 把數據表鎖住，不在往裏面寫數據

mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| xavilinux1.000001 | 732 | | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.01 sec)

### 3.6 備份下/data/mysql下的部分目錄，但mysql不須要備份，沒法主從同步，裏面包含了帳戶密碼等信息

cd /data/mysql
[root@xavi mysql]# ls
auto.cnf db2 ib_logfile0 mysql performance_schema xavi xavilinux1.000001 xavi.pid
blog ibdata1 ib_logfile1 mysql2 test xavi.err xavilinux1.index zrlog
[root@xavi mysql]# mysqldump -uroot -pxavilinux mysql2 > /tmp/my2.sql
Warning: Using a password on the command line interface can be insecure.
[root@xavi mysql]# mysqldump -uroot -pxavilinux zrlog > /tmp/zrlog.sql
Warning: Using a password on the command line interface can be insecure.

## 4、配置從機
### 4.1 編輯配置文件，並重啓MySQL服務

![mark](http://p0weeraap.bkt.clouddn.com/xavi2017/180406/GHh4fl9Ek4.png?imageslim)

[root@xavilinux mysql]# vim /etc/my.cnf
basedir =/usr/local/mysql
datadir =/data/mysql

port =3306

server_id = .....

socket =/tmp/mysql.sock
server_id=133

[root@xavi-002 mysql]# cp support-files/mysql.server /etc/init.d/mysqld
[root@xavi-002 mysql]# vim /etc/init.d/mysqld

basedir=/usr/local/mysql
datadir=/data/mysql

[root@xavilinux mysql]# /etc/init.d/mysqld restart
Shutting down MySQL.. [ OK ]
Starting MySQL. [ OK ]

### 4.2 查看從機下有哪些內容,把主機上全部mysql文件遠程複製過來scp

[root@xavi-002 ~]# ls /data/mysql
auto.cnf ib_logfile0 mysql test xavi-002.pid
ibdata1 ib_logfile1 performance_schema xavi-002.err
[root@xavi-002 ~]# scp 192.168.72.130:/tmp/*.sql /tmp/
root@192.168.72.130's password:
Permission denied, please try again.
root@192.168.72.130's password:
blog.sql 100% 1258 1.2KB/s 00:00
my2.sql 100% 638KB 638.4KB/s 00:00
zrlog.sql 100% 9880 9.7KB/s 00:00

### 4.3 把兩個命令mysql和mysqldump用alias設置

[root@xavi-002 ~]# alias 'mysql=/usr/local/mysql/bin/mysql'
[root@xavi-002 ~]# alias 'mysqldump=/usr/local/mysql/bin/mysqldump'

### 4.4 進入mysql，不設密碼，創建4個數據庫

[root@xavi-002 mysql]# mysql -uroot
mysql> create database xavi;
Query OK, 1 row affected (0.00 sec)

mysql> create database zrlog;
Query OK, 1 row affected (0.00 sec)

mysql> create database blog;
Query OK, 1 row affected (0.00 sec)

mysql> create database mysql2;
Query OK, 1 row affected (0.00 sec)

### 4.5 將新建的數據庫中恢復主機備份過來的數據

[root@xavi-002 ~]# mysql -uroot blog < /tmp/blog.sql
[root@xavi-002 ~]# mysql -uroot zrlog < /tmp/zrlog.sql

[root@xavi-002 ~]# mysql -uroot mysql2 < /tmp/my2.sql
[root@xavi-002 ~]# ls /data/mysql
auto.cnf ib_logfile0 mysql2 xavi zrlog
blog ib_logfile1 performance_schema xavi-002.err
ibdata1 mysql test xavi-002.pid

### 4.6 複製數據後，在slave上配置

[root@xavi-002 ~]# mysql -uroot
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> change master to master_host='192.168.72.130',master_user='repl',master_password='xavilinux',master_log_file='xavilinux1.000001',master_log_pos=424;
Query OK, 0 rows affected, 2 warnings (0.03 sec)

### 4.7 啓動 slave

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status\G
1. row
Slave_IO_State: Connecting to master
Master_Host: 192.168.72.130
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: xavilinux1.000001
Read_Master_Log_Pos: 424
Relay_Log_File: xavi-002-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: xavilinux1.000001
Slave_IO_Running: Connecting
Slave_SQL_Running: Yes

報錯

Last_IO_Error: error connecting to master 'repl@192.168.72.130:3306' - retry-time: 60 retries: 1

這是在3.5 小節測試時寫錯了從機的IP地址,

[root@xavi mysql]# mysql -uroot -pxavilinux
mysql> grant replication slave on . to 'repl'@'192.168.72.133' identified by 'xavilinux';
Query OK, 0 rows affected (0.00 sec)

mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)

[root@xavi mysql]# ls
auto.cnf db2 ib_logfile0 mysql performance_schema xavi xavilinux.000002 xavi.pid
blog ibdata1 ib_logfile1 mysql2 test xavi.err xavilinux.index zrlog

報錯：

mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status\G;
1. row
Slave_IO_State: Connecting to master
Master_Host: 192.168.72.130
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: xavilinux1.000004
Read_Master_Log_Pos: 331
Relay_Log_File: xavi-002-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: xavilinux1.000004
Slave_IO_Running: Connecting
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: 331
Relay_Log_Space: 120
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: 1045
Last_IO_Error: error connecting to master 'repl@192.168.72.130:3306' - retry-time: 60 retries: 1
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: /data/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: 180408 23:22:46
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> perror 1045;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'perror 1045' at line 1

查看主機受權

mysql> show grants for 'repl'@'192.168.72.133';
+------------------------------------------------------------------------------------------------------------------------------+
| Grants for repl@192.168.72.133 |
+------------------------------------------------------------------------------------------------------------------------------+
| GRANT REPLICATION SLAVE ON . TO 'repl'@'192.168.72.133' IDENTIFIED BY PASSWORD '*BF29B1459C13E117044049733F4E17D0D14AC7DB' |
+------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

* 問題一直未找到，有多是mysql版本5.5和5.6的區別

## 5、測試主從

未完待續

相關標籤/搜索

每日一句

每一个你不满意的现在，都有一个你没有努力的曾经。