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Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0
log-bin=binlog? #开启binlog功能
log-bin-index=binlog.index
sync_binlog=0
server_id = 1? ? #两台机器不能重复，一个1 一个2 就好
?
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

2.分别在两台机器上配置同步账号
10.1.1.20机器上：
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with; or \g.
Your MySQL connection id is 2
Server version: 5.0.77-log Sourcedistribution
?
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ toclear the buffer.
?
mysql> GRANT replication slave ON . TO‘ab‘@‘%‘ identified by ‘123‘;
Query OK, 0 rows affected (0.00 sec)
?
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
10.1.1.21机器上：
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with; or \g.
Your MySQL connection id is 2
Server version: 5.0.77-log Sourcedistribution
?
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ toclear the buffer.
?
mysql> GRANT replication slave ON . TO‘ab‘@‘%‘ identified by ‘123‘;
Query OK, 0 rows affected (0.00 sec)
?
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

注:由于本文是实验环境下编写，所以没考虑任何安全性问题，同步账号也是最高权限，请根据实际情况设置响应权限！！
3.设置同步
10.1.1.20机器上:
mysql> flush tables with read lock;
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000003 | 365 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.03 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.03 sec)
10.1.1.21机器上：
mysql> change master tomaster_host=‘10.1.1.20‘, master_port=3306, master_user=‘ab‘,master_password=‘123‘, master_log_file=‘binlog.000003‘,master_log_pos=365;
Query OK, 0 rows affected (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G? #执行这命令后 注意观察下面这两个参数，必须要都是yes才行
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
同样的 反过来做相同操作
10.1.1.21机器上:
mysql> flush tables with read lock;
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000004 | 207 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.03 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.03 sec)
10.1.1.20机器上：
?
mysql> change master tomaster_host=‘10.1.1.21‘, master_port=3306, master_user=‘ab‘,master_password=‘123‘, master_log_file=‘binlog.000004‘,master_log_pos=207;
Query OK, 0 rows affected (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G? #执行这命令后 注意观察下面这两个参数，必须要都是yes才行
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
介此，主主同步打造完成，可以简单测试一下，分别在两个机器上写数据 看看会不会同步到另一台机器上
PS：如果报错? Slave_IO_Running: NO? 可以检查同步的账号是否创建正常！
二、安装keepalived 并设置监控
keepalived是安装在两台MySQL服务器上的
首先安装keepalived 过程不解释就正常解压安装就好
安装后配置 vim /etc/keepalived/keepalived.conf 内容如下
10.1.1.20的配置文件
! Configuration File for keepalived
global_defs {
? notification_email {
? ? acassen@firewall.loc
? ? failover@firewall.loc
? ? sysadmin@firewall.loc
? }
? notification_email_from Alexandre.Cassen@firewall.loc
? smtp_server 127.0.0.1
? smtp_connect_timeout 30
? router_id LVS_DEVEL
}
?
vrrp_instance VI_1 {
? state backup? ? ? #两台配置此处均是BACKUP
? interface eth0
? 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 {
? ? ? 10.1.1.25
? }
}
?
virtual_server 10.1.1.25 3306 {
? delay_loop 6
? lb_algo wrr
? lb_kind DR
? persistence_timeout 50? ? ? ? #会话保持时间?
? protocol TCP
?
real_server 10.1.1.20 3306 {
? ? ? weight 3
? ? ? notify_down /tmp/nimei.sh? ? #检测到mysql服务挂了就执行这个脚本（脚本要自己写哈）
? ? ? 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?
? ? ? ? }
? ? ? }
}

10.1.1.21 的配置文件
! Configuration File for keepalived
global_defs {
? notification_email {
? ? acassen@firewall.loc
? ? failover@firewall.loc
? ? sysadmin@firewall.loc
? }
? notification_email_from Alexandre.Cassen@firewall.loc
? smtp_server 127.0.0.1
? smtp_connect_timeout 30
? router_id LVS_DEVEL
}
?
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 {
? ? ? 10.1.1.25
? }
}
?
virtual_server 10.1.1.25 3306 {
? delay_loop 6
? lb_algo wrr
? lb_kind DR
? persistence_timeout 50
? protocol TCP
?
real_server 10.1.1.21 3306 {
? ? ? weight 3
? ? ? notify_down /tmp/nimei.sh
? ? ? TCP_CHECK {
? ? ? connect_timeout 10
? ? ? nb_get_retry 3
? ? ? delay_before_retry 3
? ? ? connect_port 3306
? ? ? ? ? }
? ? ? }
}?
编写监控mysql服务是否挂了的脚本，按照上面配置文件的位置编写脚本。
vim /tmp/nimei.sh
#!/bin/sh?
pkill keepalived
脚本很简单啊 就一句，目的是当keepalived检测到mysql服务挂了之后触发这个脚本，杀死keepalived进程，让另一台机器接管
好 修改后启动keeplived服务
介此整个集群搭建完成
三、测试
找一台机器用虚拟ip连接mysql
[root@localhost html]# mysql -uab? -h 10.1.1.25 -p123
Welcome to the MySQL monitor.? Commands end with ; or \g.
Your MySQL connection id is 736
Server version: 5.1.66-log Source distribution
?
Copyright (c) 2000, 2012,?Oracle?and/or its affiliates. All rights reserved.
?
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
mysql>

keepalived+mysql实现高可用

标签：主从   use   yum   my.cnf   protoc   机器   监控   tor   关系   

原文地址：http://blog.51cto.com/niming2008/2136400