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分类： 系统运维
2016-01-21 18:19:44
|
主机名 |
IP地址 |
虚拟ip（VIP） |
|
Mysql01 |
192.168.47.149 |
192.168.47.140 |
|
Mysql02 |
192.168.47.148 |
192.168.47.140 |
两台数据库上面设置相应的host文件
vim /etc/hosts
127.0.0.1 Mysql01
localhost Mysql01
192.168.47.149 Mysql01
192.168.47.148 Mysql02
Keepalived的安装
3.1 #yum install keepalived –y
3.2 Mysql01进行参数文件的修改
cat /etc/keepalived/keepalived.conf
#! Configuration File for keepalived
global_defs {
router_id Mysql01 #修改为自己的主机名
}
##################第一部分###################
vrrp_instance VI_1 {
state BACKUP #都修改成BACKUP
interface eth0
virtual_router_id 60 #默认51 主从都修改为60
priority 100 #优先级（1-254之间），另一台改为90，备用节点必须比主节点优先级低。
advert_int 1
nopreempt #不抢占资源，意思就是它活了之后也不会再把主抢回来
authentication {
#设置验证信息，两个节点必须一致
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.47.140
}
}
##################第二部分###################
virtual_server 192.168.47.140 3306 {
delay_loop 6
lb_algo wrr #LVS算法
lb_kind DR #LVS模式
nat_mask 255.255.255.0
persistence_timeout 50 #会话保持时间
protocol TCP
real_server 192.168.47.149 3306 {
weight 1
notify_down /usr/local/script/mysql.sh #检测到服务down后执行的脚本
TCP_CHECK {
connect_timeout 10 #连接超时时间
nb_get_retry 3 #重连次数
connect_port 3306 #健康检查端口
}
}
}
3.3 Mysql02进行参数文件的修改
cat /etc/keepalived/keepalived.conf
#! Configuration File for keepalived
global_defs {
router_id Mysql02 #修改为自己的主机名
}
##################第一部分###################
vrrp_instance VI_1 {
state BACKUP #都修改成BACKUP
interface eth0
virtual_router_id 60 #默认51 主从都修改为60
priority 80 #在mysql-ha1上LVS上修改成100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.47.140
}
}
##################第二部分###################
virtual_server 192.168.47.140 3306 {
delay_loop 6
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.47.140 3306 {
weight 1
notify_down /usr/local/script/mysql.sh #进行数据库状态的判断
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
connect_port 3306
}
}
}
参数说明：
virtual_ipaddress：虚拟IP地址（VIP）
interface ：网卡设备名称
virtual_server VIP：及Mysql服务端口
real_server ：真实服务器地址
3.4 分别在两台mysql数据库上面创建以下脚本，用于判断数据库的状态
vim /usr/local/script/mysql.sh
#!/bin/bash
/etc/init.d/keepalived stop
/etc/init.d/keepalived start
3.5 keepalived的常用脚本
启动keepalived服务：service keepalived start
查看keepalived服务：service keepalived status
停止keepalived服务：service keepalived stop
3.6 进行测试
a) 使用PS命令检测服务运行状态
Ps -ef|grep keepalived
Ps -ef|grep mysql
b) 查看系统日志，确定keepalived运行正确
less /var/log/message
tail -f /var/log/messages
c) ip a查看keepalived的运行情况
注意事项：先启动mysql后启动keepalived。
MySQL-VIP：192.168.1.90
MySQL-master1：192.168.1.91
MySQL-master2：192.168.1.92
OS版本：CentOS 5.4
MySQL版本：5.0.89
Keepalived版本：1.1.20
一、MySQL master-master配置
[root@localhost ~]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.0.77 Source distribution
Type 'help;' or '\h' for help. Type '\c' toclear the buffer.
mysql> GRANT ALL PRIVILEGES ON *.* TO root@'%';
Query OK, 0 rows affected (0.01 sec)
mysql> use mysql;
Reading table information for completion oftable and column names
You can turn off this feature to get aquicker startup with -A
Database changed
mysql> update user setPassword=password('bee') where user='root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnings: 0
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| MySQL-bin.000001 | 328 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
1、修改MySQL配置文件
[mysqld]
log-bin=MySQL-bin
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
server-id = 2
replicate-same-server-id = 0
auto-increment-increment = 2
auto-increment-offset = 2
replicate-ignore-db=test
replicate-ignore-db=mysql
slave-skip-errors=all
# Default to using old password format forcompatibility with mysql 3.x
# clients (those using the mysqlclient10compatibility package).
old_passwords=1
# Disabling symbolic-links is recommended toprevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0
[replication]
master-host=192.168.1.91
master-user=replication
master-password=replication
master-port=3306
master-connect-retry=60
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
两台MySQL均如要开启binlog日志功能，
开启方法：在MySQL配置文件[MySQLd]段中加上log-bin=MySQL-bin选项
两台MySQL的server-ID不能一样，默认情况下两台MySQL的serverID都是1，需将其中一台修改为2即可
2、将192.168.1.201设为192.168.1.202的主服务器
在192.168.1.201上新建授权用户
MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication';
Query OK, 0 rows affected (0.00 sec)
MySQL> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| MySQL-bin.000003 | 374 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
在192.168.1.202上将192.168.1.201设为自己的主服务器
MySQL> change master to master_host='192.168.1.201',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374;
Query OK, 0 rows affected (0.05 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: 192.168.1.201
Master_User: replication
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: MySQL-bin.000003
Read_Master_Log_Pos: 374
Relay_Log_File: MySQL-master2-relay-bin.000002
Relay_Log_Pos: 235
Relay_Master_Log_File: MySQL-bin.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: 374
Relay_Log_Space: 235
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)
3、将192.168.1.202设为192.168.1.201的主服务器
在192.168.1.202上新建授权用户
MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication';
Query OK, 0 rows affected (0.00 sec)
MySQL> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| MySQL-bin.000003 | 374 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
在192.168.1.201上，将192.168.1.202设为自己的主服务器
MySQL> change master to master_host='192.168.1.202',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374;
Query OK, 0 rows affected (0.05 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: 192.168.1.202
Master_User: replication
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: MySQL-bin.000003
Read_Master_Log_Pos: 374
Relay_Log_File: MySQL-master1-relay-bin.000002
Relay_Log_Pos: 235
Relay_Master_Log_File: MySQL-bin.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: 374
Relay_Log_Space: 235
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)
4、MySQL同步测试
如上述均正确配置，现在任何一台MySQL上更新数据都会同步到另一台MySQL，MySQL同步在此不再演示
二、keepalived安装及配置
1、192.168.1.201服务器上keepalived安装及配置
安装keepalived
#tar zxvf keepalived-1.1.20.tar.gz
#cd keepalived-1.1.20
#./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
（注意这里2.6.18-164.el5-i686版本自己到服务器的/usr/src/kernels目录下去看，写当前服务器中存在的版本）
#make && make install
[root@master2 ~]#/usr/local/keepalived/sbin/keepalived -D
[root@master2 ~]# ps -aux|grep keepalived
Warning: bad syntax, perhaps a bogus '-'?See /usr/share/doc/procps-3.2.7/FAQ
root 4101 0.3 0.1 35828 632 ? Ss 15:41 0:00/usr/local/keepalived/sbin/keepalived -D
root 4102 0.7 0.4 39988 1620 ? S 15:41 0:00/usr/local/keepalived/sbin/keepalived -D
root 4103 0.5 0.3 39988 1092 ? S 15:41 0:00/usr/local/keepalived/sbin/keepalived -D
root 4106 0.0 0.2 61136 716 pts/0 R+ 15:41 0:00 grep keepalived
配置keepalived
ln -sv /usr/src/kernels/2.6.18-194.el5-x86_64/ /usr/src/linux
我们自己在新建一个配置文件，默认情况下keepalived启动时会去/etc/keepalived目录下找配置文件
#mkdir /etc/keepalived
#vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
luwenju@live.cn
}
notification_email_from luwenju@live.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MySQL-ha
}
vrrp_instance VI_1 {
state BACKUP #两台配置此处均是BACKUP
interface eth0 #网卡，可使用ifconfig查看
virtual_router_id 51
priority 100 #优先级，另一台改为90
advert_int 1
nopreempt #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.200
}
}
virtual_server 192.168.1.200 3306 {
delay_loop 2 #每个2秒检查一次real_server状态
lb_algo wrr #LVS算法
lb_kind DR #LVS模式
persistence_timeout 60 #会话保持时间
protocol TCP
real_server 192.168.1.201 3306 {
weight 3
notify_down /usr/local/MySQL/bin/MySQL.sh #检测到服务down后执行的脚本
TCP_CHECK {
connect_timeout 10 #连接超时时间
nb_get_retry 3 #重连次数
delay_before_retry 3 #重连间隔时间
connect_port 3306 #健康检查端口
}
}
编写检测服务down后所要执行的脚本
#vi /usr/local/MySQL/bin/MySQL.sh
#!/bin/sh
pkill keepalived
#chmod +x /usr/local/MySQL/bin/MySQL.sh
注：此脚本是上面配置文件notify_down选项所用到的，keepalived使用notify_down选项来检查real_server的服务状态，当发现real_server服务故障时，便触发此脚本；我们可以看到，脚本就一个命令，通过pkillkeepalived强制杀死keepalived进程，从而实现了MySQL故障自动转移。另外，我们不用担心两个MySQL会同时提供数据更新操作，因为每台MySQL上的keepalived的配置里面只有本机MySQL的IP+VIP，而不是两台MySQL的IP+VIP
启动keepalived
#/usr/local/keepalived/sbin/keepalived –D
#ps -aux | grep keepalived
测试
找一台局域网PC，然后去ping MySQL的VIP，这时候MySQL的VIP是可以ping的通的
停止MySQL服务，看keepalived健康检查程序是否会触发我们编写的脚本
2、192.168.1.202上keepalived安装及配置
安装keepalived
#tar zxvf keepalived-1.1.20.tar.gz
#cd keepalived-1.1.20
#./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
#make && make install
配置keepalived
这台配置和上面基本一样，但有三个地方不同：优先级为90、无抢占设置、real_server为本机IP
#mkdir /etc/keepalived
#vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
luwenju@live.cn
}
notification_email_from luwenju@live.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MySQL-ha
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.200
}
}
virtual_server 192.168.1.200 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.1.202 3306 {
weight 3
notify_down /usr/local/MySQL/bin/MySQL.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
编写检测服务down后所要执行的脚本
#vi /usr/local/MySQL/bin/MySQL.sh
#!/bin/sh
pkill keepalived
#chmod +x /usr/local/MySQL/bin/MySQL.sh
启动keepalived
#/usr/local/keepalived/sbin/keepalived –D
#ps -aux | grep keepalived
测试
停止MySQL服务，看keepalived健康检查程序是否会触发我们编写的脚本
三、测试
MySQL远程登录测试
我们找一台安装有MySQL客户端的windows，然后登录VIP，看是否能登录，在登录之两台MySQL服务器都要授权允许从远程登录
MySQL> grant all privileges on *.* to 'root'@'%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
MySQL> flush privileges;
Query OK, 0 rows affected (0.00 sec)
使用客户端登录VIP测试
C:\MySQL\bin>MySQL.exe -uroot -p123456 -h192.168.1.200 -P3306
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 224
Server version: 5.0.89-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL>
● keepalived故障转移测试
※在windows客户端一直去ping VIP，然后关闭192.168.1.201上的keepalived，正常情况下VIP就会切换到192.168.1.202上面去
※开启192.168.1.201上的keepalived，关闭192.168.1.202上的keepalived，看是否能自动切换，正常情况下VIP又会属于192.168.1.201
注：keepalived切换速度还是非常块的，整个切换过程只需1-3秒
● MySQL故障转移测试
※在192.168.1.201上关闭MySQL服务，看VIP是否会切换到192.168.1.202上
※开启192.168.1.201上的MySQL和keepalived，然后关闭192.168.1.202上的MySQL，看VIP是否会切换到192.168.1.201上
下面是用windows客户端连接的MySQL的VIP，在切换时我执行了一个MySQL查询命令，从执行show databases到显示出结果时间为3-5秒（大家可以看到上面有个错误提示，不过不用担心，因为我们的keepalived切换大概为3秒左右，这3秒左右VIP是谁都不属于的）
MySQL> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 592
Current database: *** NONE ***
+--------------------+
| Database |
+--------------------+
| information_schema |
| MySQL |
| test |
+--------------------+
3 rows in set (9.01 sec)
后话：世间万事万物，都不具备绝对的完美，就像上面的MySQL-HA一样，keepalived只能做到对3306的健康检查，但是做不到比如像MySQL复制中的slave-SQL、slave-IO进程的检查。所以要想做到一些细致的健康检查，还得需要借助额外的监控工具，比如nagios，然后用nagios实现短信、邮件报警，从而能够有效地解决问题。
mysql> GRANT REPLICATION SLAVE ON *.*
-> TO 'repl'@'%.mydomain.com' IDENTIFIED BY 'slavepass';
如果你没有备份主服务器，这里是一个创建备份的快速程序。所有步骤都应该在主服务器主机上执行。
1. 发出该语句：
mysql> FLUSH TABLES WITH READ LOCK；
2. 仍然加锁时，执行该命令（或它的变体）：
shell> tar zcf /tmp/backup.tar.gz /var/lib/mysql
3. 发出该语句并且确保记录了以后用到的输出：
mysql>SHOW MASTER STATUS；
4. 释放锁：
mysql> UNLOCK TABLES；
一个可选择的方法是，转储主服务器的SQL来代替前面步骤中的二进制复制。要这样做，你可以在主服务器上使用mysqldump --master-data，以后装载SQL转储到到你的从服务器。
1. MySQL-VIP：192.168.1.200 2. MySQL-master1：192.168.1.201 3. MySQL-master2：192.168.1.202 4. 5. OS版本：CentOS 5.4 6. MySQL版本：5.0.89 7. Keepalived版本：1.1.20
一、MySQL master-master配置
1、修改MySQL配置文件
两台MySQL均如要开启binlog日志功能，开启方法：在MySQL配置文件[MySQLd]段中加上log-bin=MySQL-bin选项
两台MySQL的server-ID不能一样，默认情况下两台MySQL的serverID都是1，需将其中一台修改为2即可
2、将192.168.1.201设为192.168.1.202的主服务器
在192.168.1.201上新建授权用户
1. MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication'; 2. Query OK, 0 rows affected (0.00 sec) 3. 4. MySQL> show master status; 5. +------------------+----------+--------------+------------------+ 6. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | 7. +------------------+----------+--------------+------------------+ 8. | MySQL-bin.000003 | 374 | | | 9. +------------------+----------+--------------+------------------+ 10. 1 row in set (0.00 sec)
在192.168.1.202上将192.168.1.201设为自己的主服务器
1. MySQL> change master to master_host='192.168.1.201',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374; 2. Query OK, 0 rows affected (0.05 sec) 3. 4. MySQL> start slave; 5. Query OK, 0 rows affected (0.00 sec) 6. 7. MySQL> show slave status\G 8. *************************** 1. row *************************** 9. Slave_IO_State: Waiting for master to send event 10. Master_Host: 192.168.1.201 11. Master_User: replication 12. Master_Port: 3306 13. Connect_Retry: 60 14. Master_Log_File: MySQL-bin.000003 15. Read_Master_Log_Pos: 374 16. Relay_Log_File: MySQL-master2-relay-bin.000002 17. Relay_Log_Pos: 235 18. Relay_Master_Log_File: MySQL-bin.000003 19. Slave_IO_Running: Yes 20. Slave_SQL_Running: Yes 21. Replicate_Do_DB: 22. Replicate_Ignore_DB: 23. Replicate_Do_Table: 24. Replicate_Ignore_Table: 25. Replicate_Wild_Do_Table: 26. Replicate_Wild_Ignore_Table: 27. Last_Errno: 0 28. Last_Error: 29. Skip_Counter: 0 30. Exec_Master_Log_Pos: 374 31. Relay_Log_Space: 235 32. Until_Condition: None 33. Until_Log_File: 34. Until_Log_Pos: 0 35. Master_SSL_Allowed: No 36. Master_SSL_CA_File: 37. Master_SSL_CA_Path: 38. Master_SSL_Cert: 39. Master_SSL_Cipher: 40. Master_SSL_Key: 41. Seconds_Behind_Master: 0 42. 1 row in set (0.00 sec)
3、将192.168.1.202设为192.168.1.201的主服务器
在192.168.1.202上新建授权用户
1. MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication'; 2. Query OK, 0 rows affected (0.00 sec) 3. 4. MySQL> show master status; 5. +------------------+----------+--------------+------------------+ 6. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | 7. +------------------+----------+--------------+------------------+ 8. | MySQL-bin.000003 | 374 | | | 9. +------------------+----------+--------------+------------------+ 10. 1 row in set (0.00 sec)
在192.168.1.201上，将192.168.1.202设为自己的主服务器
1. MySQL> change master to master_host='192.168.1.202',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374; 2. Query OK, 0 rows affected (0.05 sec) 3. 4. MySQL> start slave; 5. Query OK, 0 rows affected (0.00 sec) 6. 7. MySQL> show slave status\G 8. *************************** 1. row *************************** 9. Slave_IO_State: Waiting for master to send event 10. Master_Host: 192.168.1.202 11. Master_User: replication 12. Master_Port: 3306 13. Connect_Retry: 60 14. Master_Log_File: MySQL-bin.000003 15. Read_Master_Log_Pos: 374 16. Relay_Log_File: MySQL-master1-relay-bin.000002 17. Relay_Log_Pos: 235 18. Relay_Master_Log_File: MySQL-bin.000003 19. Slave_IO_Running: Yes 20. Slave_SQL_Running: Yes 21. Replicate_Do_DB: 22. Replicate_Ignore_DB: 23. Replicate_Do_Table: 24. Replicate_Ignore_Table: 25. Replicate_Wild_Do_Table: 26. Replicate_Wild_Ignore_Table: 27. Last_Errno: 0 28. Last_Error: 29. Skip_Counter: 0 30. Exec_Master_Log_Pos: 374 31. Relay_Log_Space: 235 32. Until_Condition: None 33. Until_Log_File: 34. Until_Log_Pos: 0 35. Master_SSL_Allowed: No 36. Master_SSL_CA_File: 37. Master_SSL_CA_Path: 38. Master_SSL_Cert: 39. Master_SSL_Cipher: 40. Master_SSL_Key: 41. Seconds_Behind_Master: 0 42. 1 row in set (0.00 sec)
4、MySQL同步测试
如上述均正确配置，现在任何一台MySQL上更新数据都会同步到另一台MySQL，MySQL同步在此不再演示
二、keepalived安装及配置
1、192.168.1.201服务器上keepalived安装及配置
安装keepalived
1. #tar zxvf keepalived-1.1.20.tar.gz 2. #cd keepalived-1.1.20 3. #./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 4. #make && make install
配置keepalived
我们自己在新建一个配置文件，默认情况下keepalived启动时会去/etc/keepalived目录下找配置文件
1. #mkdir /etc/keepalived 2. #vi /etc/keepalived/keepalived.conf 3. ! Configuration File for keepalived 4. global_defs { 5. notification_email { 6. luwenju@live.cn 7. } 8. notification_email_from luwenju@live.cn 9. smtp_server 127.0.0.1 10. smtp_connect_timeout 30 11. router_id MySQL-ha 12. } 13. 14. vrrp_instance VI_1 { 15. state BACKUP #两台配置此处均是BACKUP 16. interface eth0 17. virtual_router_id 51 18. priority 100 #优先级，另一台改为90 19. advert_int 1 20. nopreempt #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置 21. authentication { 22. auth_type PASS 23. auth_pass 1111 24. } 25. virtual_ipaddress { 26. 192.168.1.200 27. } 28. } 29. 30. virtual_server 192.168.1.200 3306 { 31. delay_loop 2 #每个2秒检查一次real_server状态 32. lb_algo wrr #LVS算法 33. lb_kind DR #LVS模式 34. persistence_timeout 60 #会话保持时间 35. protocol TCP 36. real_server 192.168.1.201 3306 { 37. weight 3 38. notify_down /usr/local/MySQL/bin/MySQL.sh #检测到服务down后执行的脚本 39. TCP_CHECK { 40. connect_timeout 10 #连接超时时间 41. nb_get_retry 3 #重连次数 42. delay_before_retry 3 #重连间隔时间 43. connect_port 3306 #健康检查端口 44. } 45. }
编写检测服务down后所要执行的脚本
#vi /usr/local/MySQL/bin/MySQL.sh #!/bin/sh pkill keepalived #chmod +x /usr/local/MySQL/bin/MySQL.sh
注：此脚本是上面配置文件notify_down选项所用到的，keepalived使用notify_down选项来检查real_server的服务状态，当发现real_server服务故障时，便触发此脚本；我们可以看到，脚本就一个命令，通过pkill keepalived强制杀死keepalived进程，从而实现了MySQL故障自动转移。另外，我们不用担心两个MySQL会同时提供数据更新操作，因为每台MySQL上的keepalived的配置里面只有本机MySQL的IP+VIP，而不是两台MySQL的IP+VIP
启动keepalived
1. #/usr/local/keepalived/sbin/keepalived –D 2. #ps -aux | grep keepalived
测试
找一台局域网PC，然后去ping MySQL的VIP，这时候MySQL的VIP是可以ping的通的
停止MySQL服务，看keepalived健康检查程序是否会触发我们编写的脚本
2、192.168.1.202上keepalived安装及配置
安装keepalived
1. #tar zxvf keepalived-1.1.20.tar.gz 2. #cd keepalived-1.1.20 3. #./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 4. #make && make install
配置keepalived
这台配置和上面基本一样，但有三个地方不同：优先级为90、无抢占设置、real_server为本机IP
1. #mkdir /etc/keepalived 2. #vi /etc/keepalived/keepalived.conf 3. ! Configuration File for keepalived 4. global_defs { 5. notification_email { 6. luwenju@live.cn 7. } 8. notification_email_from luwenju@live.cn 9. smtp_server 127.0.0.1 10. smtp_connect_timeout 30 11. router_id MySQL-ha 12. } 13. 14. vrrp_instance VI_1 { 15. state BACKUP 16. interface eth0 17. virtual_router_id 51 18. priority 90 19. advert_int 1 20. authentication { 21. auth_type PASS 22. auth_pass 1111 23. } 24. virtual_ipaddress { 25. 192.168.1.200 26. } 27. } 28. 29. virtual_server 192.168.1.200 3306 { 30. delay_loop 2 31. lb_algo wrr 32. lb_kind DR 33. persistence_timeout 60 34. protocol TCP 35. real_server 192.168.1.202 3306 { 36. weight 3 37. notify_down /usr/local/MySQL/bin/MySQL.sh 38. TCP_CHECK { 39. connect_timeout 10 40. nb_get_retry 3 41. delay_before_retry 3 42. connect_port 3306 43. } 44. }
编写检测服务down后所要执行的脚本
1. #vi /usr/local/MySQL/bin/MySQL.sh 2. #!/bin/sh 3. pkill keepalived 4. #chmod +x /usr/local/MySQL/bin/MySQL.sh 5. 6. 启动keepalived 7. #/usr/local/keepalived/sbin/keepalived –D 8. #ps -aux | grep keepalived
测试
停止MySQL服务，看keepalived健康检查程序是否会触发我们编写的脚本
三、测试
MySQL远程登录测试
我们找一台安装有MySQL客户端的windows，然后登录VIP，看是否能登录，在登录之两台MySQL服务器都要授权允许从远程登录
1. MySQL> grant all privileges on *.* to 'root'@'%' identified by '123456'; 2. Query OK, 0 rows affected (0.00 sec) 3. 4. MySQL> flush privileges; 5. Query OK, 0 rows affected (0.00 sec)
使用客户端登录VIP测试
1. C:\MySQL\bin>MySQL.exe -uroot -p123456 -h192.168.1.200 -P3306 2. Welcome to the MySQL monitor. Commands end with ; or \g. 3. Your MySQL connection id is 224 4. Server version: 5.0.89-log Source distribution 5. 6. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. 7. 8. MySQL>
● keepalived故障转移测试
※在windows客户端一直去ping VIP，然后关闭192.168.1.201上的keepalived，正常情况下VIP就会切换到192.168.1.202上面去
※开启192.168.1.201上的keepalived，关闭192.168.1.202上的keepalived，看是否能自动切换，正常情况下VIP又会属于192.168.1.201
注：keepalived切换速度还是非常块的，整个切换过程只需1-3秒
● MySQL故障转移测试
※在192.168.1.201上关闭MySQL服务，看VIP是否会切换到192.168.1.202上
※开启192.168.1.201上的MySQL和keepalived，然后关闭192.168.1.202上的MySQL，看VIP是否会切换到192.168.1.201上
下面是用windows客户端连接的MySQL的VIP，在切换时我执行了一个MySQL查询命令，从执行show databases到显示出结果时间为3-5秒（大家可以看到上面有个错误提示，不过不用担心，因为我们的keepalived切换大概为3秒左右，这3秒左右VIP是谁都不属于的）
1. MySQL> show databases; 2. ERROR 2006 (HY000): MySQL server has gone away 3. No connection. Trying to reconnect... 4. Connection id: 592 5. Current database: *** NONE *** 6. 7. +--------------------+ 8. | Database | 9. +--------------------+ 10. | information_schema | 11. | MySQL | 12. | test | 13. +--------------------+ 14. 3 rows in set (9.01 sec)
