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mysql数据库备份设置延时备份方法(mysql主从配置)
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一 为什么需要延时备份

percona-xtrabackup是一个优秀的用于增量备份的工具。今天我们讲到的延时备份也是使用他们的产品。
以前在MySQL AB复制一文中提到了AB复制。我们首先回顾下MySQL复制的相关要点。AB复制又称主从复制，实现的是数据同步。经过以下步骤：

1)主服务器把数据更改记录到二进制日志中，这个操作叫做二进制日志事件；

2)从服务器把主服务器的二进制日志事件拷贝到自己的中继日志（relay log）中；

3)从服务器执行中继日志中的事件，把更改应用到自己的数据上。

在生产中，我们在使用 mysql AB 复制技术不但可以起到数据库层面负载均衡的能力，还可以起到备份数据的功能，但有的时候我们可能由于不小心误操作导致数据被删除，这这个时候 slave服务器上的数据也会同时被删除，如果我们能够能是的其中的一台 slave 延时备份的话， 这样就可以从 slave服务器上找回被误删的数据了。
从服务器到主服务器中拷贝二进制日志文件，如果在并发量高，网络延时严重的情况下，会对主服务器造成相当大的压力，负载高，必定会出现很多问题，比如访问延迟，IO瓶颈，网络拥塞等等。服务器压力过大是我们都不愿看到的情况，那有没有方案缓解这种情况呢？有，这就是本文讲到的延时备份。延时备份通过第三方工具，将检查同步和真正同步的时间控制在一定的范围内，而不是主服务器数据发生变化，从服务器立即去同步二进制事件到自己的中继日志中，这样的话可以大大减轻主服务器的压力，并且基于AB复制的优点，可以达到备份数据的目的。


环境简介

serv01：主服务器 192.168.1.11serv01.host.com

serv08：及时同步服务器 192.168.1.18serv01.host.com

serv09：延时同步服务器 192.168.1.19serv08.host.com

操作系统版本

RHEL Server6.1 64位系统

使用到的软件包版本

mysql-5.5.29-linux2.6-x86_64.tar.gz

percona-toolkit-2.1.7-1.noarch.rpm

第一步，搭建环境。修改配置文件，注意每台的server-id不一致；

复制代码 代码如下:
[root@serv01 ~]# cat /etc/my.cnf | grep server-id
server-id = 1
#server-id       = 2
[root@serv01 ~]# /etc/init.d/mysqld start
Starting MySQL SUCCESS!

[root@serv08 ~]# cat /etc/my.cnf | grep server-id
server-id = 2
#server-id       = 2
[root@serv08 ~]# /etc/init.d/mysqld start
Starting MySQL SUCCESS!

[root@serv09 ~]# cat /etc/my.cnf | grep server-id
server-id = 3
#server-id       = 2
[root@serv09 ~]# /etc/init.d/mysqld start
Starting MySQL SUCCESS!

第二步，serv01serv08 serv09清空日志

复制代码 代码如下:
serv01
mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       683 |
+------------------+-----------+
1 row in set (0.01 sec)

mysql> reset master;
Query OK, 0 rows affected (0.01 sec)

mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       107 |
+------------------+-----------+
1 row in set (0.00 sec)

serv08
mysql> reset master;
Query OK, 0 rows affected (0.02 sec)

mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       107 |
+------------------+-----------+
1 row in set (0.00 sec)

serv09
mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       107 |
+------------------+-----------+
1 row in set (0.00 sec)

mysql> reset master;
Query OK, 0 rows affected (0.00 sec)

mysql> show binary logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       107 |
+------------------+-----------+
1 row in set (0.00 sec)

第三步，主服务器serv01创建授权用户

复制代码 代码如下:
mysql> grant replication client, replication slave on *.* to 'larry'@'192.168.1.%' identified by 'larry';

第四步，serv08修改master设置，开启slave，查看slave状态

复制代码 代码如下:
mysql> change master to
    -> master_host='192.168.1.11',
    -> master_user='larry',
    -> master_password='larry',
    -> master_port=3306,
    -> master_log_file='mysql-bin.000001',
    -> master_log_pos=107;
Query OK, 0 rows affected (0.03 sec)

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

mysql> show slave status G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.11
                  Master_User: larry
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 107
               Relay_Log_File: serv08-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000001
             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: 107
              Relay_Log_Space: 410
              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
1 row in set (0.00 sec)

ERROR:
No query specified

第五步，serv09延时服务器修改master状态，开启slave，查看slave状态

复制代码 代码如下:
mysql> change master to master_host='192.168.1.11', master_user='larry', master_password='larry', master_port=3306, master_log_file='mysql-bin.000001', master_log_pos=107;
Query OK, 0 rows affected (0.02 sec)

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

mysql> show slave status G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.11
                  Master_User: larry
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 107
               Relay_Log_File: serv09-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000001
             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: 107
              Relay_Log_Space: 410
              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
1 row in set (0.00 sec)

ERROR:
No query specified

第六步，在没有使用延时服务器时，serv01创建测试数据库，可以看到同步服务器serv08和延时服务器serv09已经同步了

复制代码 代码如下:
serv01
mysql> create database justdb;
Query OK, 1 row affected (0.01 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| crm                |
| justdb             |
| larry              |
| larrydb            |
| mysql              |
| performance_schema |
| test               |
+--------------------+
8 rows in set (0.00 sec)

serv08
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| justdb             |
| larrydb            |
| mysql              |
| performance_schema |
| test               |
+--------------------+
6 rows in set (0.03 sec)

serv09
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| justdb             |
| larry              |
| larrydb            |
| mysql              |
| performance_schema |
| test               |
+--------------------+
7 rows in set (0.00 sec)

第七步，拷贝percona-toolkit-2.1.7-1.noarch.rpm

复制代码 代码如下:
[root@larrywen ule-mysql]# scp percona-toolkit-2.1.7-1.noarch.rpm 192.168.1.11:/opt
root@192.168.1.11's password:
percona-toolkit-2.1.7-1.noarch.rpm                       100% 1767KB   1.7MB/s   00:00

第八步，主服务器中通过yum安装percona-toolkit-2.1.7-1.noarch.rpm

复制代码 代码如下:
[root@serv01 opt]# yum install percona-toolkit-2.1.7-1.noarch.rpm -y

第九步，使用pt-slave-delay工具进行延时设置。可以先查看帮助。

复制代码 代码如下:
[root@serv01 opt]# pt-slave-delay --help
pt-slave-delay starts and stops a slave server as needed to make it lag behind
the master.  The SLAVE-HOST and MASTER-HOST use DSN syntax, and values are
copied from the SLAVE-HOST to the MASTER-HOST if omitted.  For more details,
please use the --help option, or try 'perldoc /usr/bin/pt-slave-delay' for
complete documentation.

Usage: pt-slave-delay [OPTION...] SLAVE-HOST [MASTER-HOST]

Options:

  --ask-pass            Prompt for a password when connecting to MySQL
  --charset=s       -A  Default character set
  --config=A            Read this comma-separated list of config files; if
                        specified, this must be the first option on the command
                        line
  --[no]continue        Continue replication normally on exit (default yes)
  --daemonize           Fork to the background and detach from the shell
  --database=s      -D  The database to use for the connection
  --defaults-file=s -F  Only read mysql options from the given file
  --delay=m             How far the slave should lag its master (default 1h).
                        Optional suffix s=seconds, m=minutes, h=hours, d=days;
                        if no suffix, s is used.
  --help                Show help and exit
  --host=s          -h  Connect to host
  --interval=m          How frequently pt-slave-delay should check whether the
                        slave needs to be started or stopped (default 1m).
                        Optional suffix s=seconds, m=minutes, h=hours, d=days;
                        if no suffix, s is used.
  --log=s               Print all output to this file when daemonized
  --password=s      -p  Password to use when connecting
  --pid=s               Create the given PID file when daemonized
  --port=i          -P  Port number to use for connection
  --quiet           -q  Don't print informational messages about operation
  --run-time=m          How long pt-slave-delay should run before exiting.
                        Optional suffix s=seconds, m=minutes, h=hours, d=days;
                        if no suffix, s is used.
  --set-vars=s          Set these MySQL variables (default wait_timeout=10000)
  --socket=s        -S  Socket file to use for connection
  --use-master          Get binlog positions from master, not slave
  --user=s          -u  User for login if not current user
  --version             Show version and exit
  --version-check=s     Send program versions to Percona and print suggested
                        upgrades and problems (default off)

Option types: s=string, i=integer, f=float, h/H/a/A=comma-separated list, d=DSN, z=size, m=time

Rules:

  This tool accepts additional command-line arguments. Refer to the SYNOPSIS and usage information for details.

DSN syntax is key=value[,key=value...]  Allowable DSN keys:

  KEY  COPY  MEANING
  ===  ====  =============================================
  A    yes   Default character set
  D    yes   Default database
  F    yes   Only read default options from the given file
  P    yes   Port number to use for connection
  S    yes   Socket file to use for connection
  h    yes   Connect to host
  p    yes   Password to use when connecting
  u    yes   User for login if not current user

  If the DSN is a bareword, the word is treated as the 'h' key.

Options and values after processing arguments:

  --ask-pass            FALSE
  --charset             (No value)
  --config              /etc/percona-toolkit/percona-toolkit.conf,/etc/percona-toolkit/pt-slave-delay.conf,/root/.percona-toolkit.conf,/root/.pt-slave-delay.conf
  --continue            TRUE
  --daemonize           FALSE
  --database            (No value)
  --defaults-file       (No value)
  --delay               3600
  --help                TRUE
  --host                (No value)
  --interval            60
  --log                 (No value)
  --password            (No value)
  --pid                 (No value)
  --port                (No value)
  --quiet               FALSE
  --run-time            (No value)
  --set-vars            wait_timeout=10000
  --socket              (No value)
  --use-master          FALSE
  --user                (No value)
  --version             FALSE
  --version-check       off

第十步，serv09延时服务器中创建授权用户

复制代码 代码如下:
mysql> grant all on *.* to 'rep'@'192.168.1.%' identified by 'larry';
Query OK, 0 rows affected (0.00 sec)

第十一步，实现功能。

复制代码 代码如下:
[root@serv01 ~]# pt-slave-delay --user='rep' --password='larry' --delay=3m --interval=20s --run-time=30m 192.168.1.19
2013-10-06T19:43:30 slave running 0 seconds behind
2013-10-06T19:43:30 STOP SLAVE until 2013-10-06T19:46:30 at master position mysql-bin.000001/199

<strong>命令解释</strong>
--user='rep'：延时服务器中授权用户的用户名，这里设置为rep
--password='larry'：延时服务器中授权用户的密码，这里设置为larry
--delay=3m：延时同步的时间，这里设置为3分钟
--interval=20s：检查同步的时间，这里设置为20s
--run-time=30m：pt-slave-delay的运行时间，这里设置为30分钟
192.168.1.19：延时服务器的IP地址

第十二步，测试，主服务器serv01创建测试数据库，可以发现同步服务器立马更新，而延时同步服务器要等3分钟之后才更新

复制代码 代码如下:
serv01
mysql> use justdb;
Database changed
mysql> create table test(id int);
Query OK, 0 rows affected (0.01 sec)

mysql> insert into test values(1);
Query OK, 1 row affected (0.00 sec)

serv08
  mysql> select * from justdb.test;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

serv09
mysql> select * from justdb.test;
ERROR 1146 (42S02): Table 'justdb.test' doesn't exist

三分钟过后查看延时服务器已经同步成功
[root@serv01 ~]# pt-slave-delay --user='rep' --password='larry' --delay=3m --interval=20s --run-time=30m 192.168.1.19
2013-10-06T19:43:30 slave running 0 seconds behind
2013-10-06T19:43:30 STOP SLAVE until 2013-10-06T19:46:30 at master position mysql-bin.000001/199
2013-10-06T19:43:50 slave stopped at master position mysql-bin.000001/199
2013-10-06T19:44:10 slave stopped at master position mysql-bin.000001/199
2013-10-06T19:44:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:44:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:45:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:45:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:45:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:46:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:46:30 no new binlog events
2013-10-06T19:46:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:47:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:47:30 START SLAVE until master 2013-10-06T19:44:30 mysql-bin.000001/492
2013-10-06T19:47:50 slave running 0 seconds behind
2013-10-06T19:47:50 STOP SLAVE until 2013-10-06T19:50:50 at master position mysql-bin.000001/492
2013-10-06T19:48:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:48:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:48:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:49:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:49:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:49:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:50:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:50:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:50:50 no new binlog events
2013-10-06T19:51:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:51:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:51:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:52:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:52:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:52:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:53:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:53:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:53:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:54:10 no new binlog events
2013-10-06T19:54:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:54:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:55:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:55:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:55:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:56:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:56:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:56:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:57:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:57:30 no new binlog events
2013-10-06T19:57:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:58:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:58:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:58:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:59:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:59:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T19:59:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:00:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:00:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:00:50 no new binlog events
2013-10-06T20:01:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:01:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:01:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:02:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:02:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:02:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:03:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:03:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:03:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:04:10 no new binlog events
2013-10-06T20:04:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:04:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:05:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:05:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:05:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:06:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:06:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:06:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:07:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:07:30 no new binlog events
2013-10-06T20:07:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:08:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:08:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:08:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:09:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:09:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:09:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:10:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:10:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:10:50 no new binlog events
2013-10-06T20:11:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:11:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:11:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:12:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:12:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:12:50 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:13:10 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:13:30 slave stopped at master position mysql-bin.000001/492
2013-10-06T20:13:30 Setting slave to run normally

mysql> select * from justdb.test;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

四 附延时备份脚本

复制代码 代码如下:
#!/bin/bash
#
# chkconfig: - 88 12
# description: the mysql ab delay scripts

host=192.168.100.54
user=rep
password=larry

delay=2m
in=15s

prog=/usr/bin/pt-slave-delay

. /etc/init.d/functions

start() {
    echo -n "Starting `basename $prog`..."
    daemon $prog --host=$host --user=$user --password=$password --delay=$delay --interval=$in --daemonize --log=/var/log/mysql-delay.log
    echo
}

stop() {
    echo -n "Stopping `basename $prog`..."
    killproc  $prog
    echo
}

case "$1" in
    start)
        start

    stop)
        stop

    restart)
        stop
        start

    *)
        echo "Usage: $0 {start|stop|restart}"
        exit 1
esac

标签：
mysql数据库备份,延时备份,mysql主从配置
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P70系列延期，华为新旗舰将在下月发布

3月20日消息，近期博主@数码闲聊站 透露，原定三月份发布的华为新旗舰P70系列延期发布，预计4月份上市。

而博主@定焦数码 爆料，华为的P70系列在定位上已经超过了Mate60，成为了重要的旗舰系列之一。它肩负着重返影像领域顶尖的使命。那么这次P70会带来哪些令人惊艳的创新呢？

根据目前爆料的消息来看，华为P70系列将推出三个版本，其中P70和P70 Pro采用了三角形的摄像头模组设计，而P70 Art则采用了与上一代P60 Art相似的不规则形状设计。这样的外观是否好看见仁见智，但辨识度绝对拉满。

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