keepalived+mysql实现双主高可用 - 黑帽联盟

[root@www ansible]# ansible-playbook lnmp.yml
PLAY [new] *********************************************************************
TASK [setup] *******************************************************************
ok: [192.168.2.205]
ok: [192.168.2.204]
TASK [mysql : Create backup folder] ********************************************
ok: [192.168.2.204]
ok: [192.168.2.205]
TASK [mysql : create log folder] ***********************************************
changed: [192.168.2.204]
changed: [192.168.2.205]
TASK [mysql : copy mysql_tar_gz to client] *************************************
changed: [192.168.2.204]
changed: [192.168.2.205]
TASK [mysql : copy install_script to client] ***********************************
changed: [192.168.2.204]
changed: [192.168.2.205]
TASK [mysql : copy my.cnf to /data/backup] *************************************
changed: [192.168.2.204]
changed: [192.168.2.205]
TASK [mysql : install mysql] ***************************************************
changed: [192.168.2.204]
changed: [192.168.2.205]
PLAY RECAP *********************************************************************
192.168.2.204 : ok=7 changed=5 unreachable=0 failed=0
192.168.2.205 : ok=7 changed=5 unreachable=0 failed=0

复制代码

[root@bogon ~]# vim /etc/my.cnf
server-id = 1　　　　#节点标示，主从节点不能相同，必须全局唯一
log-bin=mysql-bin　　#开启mysql的binlog日志功能
relay-log = mysql-relay-bin 　　#开启relay-log日志，relay-log日志记录的是从服务器I/O线程将主服务器的二进制日志读取过来记录到从服务器本地文件，然后SQL线程会读取relay-log日志的内容并应用到从服务器
replicate-wild-ignore-table=mysql.%　　#复制过滤选项
replicate-wild-ignore-table=test.%
replicate-wild-ignore-table=information_schema.%

复制代码

[root@localhost ~]# vim /etc/my.cnf
server-id = 2
log-bin=mysql-bin
relay-log = mysql-relay-bin
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=test.%
replicate-wild-ignore-table=information_schema.%

复制代码

mysql> grant replication slave on *.* to 'repl_user'@'192.168.2.205' identified by 'repl_passwd';
Query OK, 0 rows affected (0.04 sec)
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000004 | 271 | | |
+------------------+----------+--------------+------------------+
row in set (0.00 sec)

复制代码

mysql> change master to \
-> master_host='192.168.2.204',
-> master_user='repl_user',
-> master_password='repl_passwd',
-> master_log_file='mysql-bin.000004',
-> master_log_pos=271;
Query OK, 0 rows affected (0.07 sec)

复制代码

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

复制代码

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.2.204
Master_User: repl_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 271
Relay_Log_File: mysql-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: Yes　　　　#重点
Slave_SQL_Running: Yes　　　　#重点
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.%　　#跳过的表
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 271
Relay_Log_Space: 409
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
row in set (0.00 sec)

复制代码

mysql> grant replication slave on *.* to 'repl_user'@'192.168.2.204' identified by 'repl_passwd';
Query OK, 0 rows affected (0.00 sec)
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 | 271 | | |
+------------------+----------+--------------+------------------+
row in set (0.00 sec)

复制代码

mysql> change master to \
-> master_host='192.168.2.205',
-> master_user='repl_user',
-> master_password='repl_passwd',
-> master_log_file='mysql-bin.000005',
-> master_log_pos=271;
Query OK, 0 rows affected (0.07 sec)

复制代码

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

复制代码

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.2.205
Master_User: repl_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 271
Relay_Log_File: mysql-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000005
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: mysql.%,test.%,information_schema.%
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 271
Relay_Log_Space: 409
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: 2
row in set (0.00 sec)

复制代码

[root@bogon src]# tar zxf keepalived-1.2.24.tar.gz
[root@bogon src]# cd keepalived-1.2.24
[root@bogon keepalived-1.2.24]# ./configure --sysconf=/etc --with-kernel-dir=/lib/modules/2.6.32-642.3.1.el6.x86_64/
[root@bogon keepalived-1.2.24]# make && make install
[root@bogon keepalived-1.2.24]# ln -s /usr/local/sbin/keepalived /sbin/
[root@bogon keepalived-1.2.24]# chkconfig --add keepalived
[root@bogon keepalived-1.2.24]# chkconfig --level 35 keepalived on
[root@bogon keepalived-1.2.24]# yum -y install ipvsadm ####之前没安装ipvsadm，导致 keepalived配置中lvs配置部分不生效，其中定义的notify_down 字段死活不生效，查了好久在发现是没安装ipvsadm导致的，泪奔！！！
[root@bogon keepalived-1.2.24]# ipvsadm

复制代码

[root@bogon keepalived-1.2.24]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance HA_1 {
state BACKUP　　　　#在DB1和DB2上均配置为BACKUP
interface eth1
virtual_router_id 90
priority 100
advert_int 1
nopreempt　　　　#不抢占模式，只有优先级高的机器上设置即可，优先级低的机器可不设置
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.33
}
}
virtual_server 192.168.2.33 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60　　#会话保持时间
protocol TCP
real_server 192.168.2.204 3306 {
weight 3
notify_down /root/shutdown.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
}
}
}

复制代码

[root@localhost keepalived-1.2.24]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance HA_1 {
state BACKUP
interface eth1
virtual_router_id 90
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.33
}
}
virtual_server 192.168.2.33 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.2.205 3306 {
weight 3
notify_down /root/shutdown.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}

复制代码

[root@bogon ~]# cat /root/shtdown.sh
#!/bin/bash
killall keepalived

复制代码

[root@bogon keepalived-1.2.24]# chmod 755 /etc/init.d/keepalived
[root@bogon keepalived-1.2.24]# service keepalived start
正在启动 keepalived： [确定]
[root@bogon keepalived-1.2.24]# tail -f /var/log/messages
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: VRRP_Instance(HA_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33

复制代码

[root@www ansible]# mysql -h 192.168.2.33 -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2372
Server version: 5.5.37-log Source distribution
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>
mysql> show variables like "%hostname%"
-> ;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| hostname | bogon |
+---------------+-------+
row in set (0.00 sec)

复制代码

mysql> create database repldb;
Query OK, 1 row affected (0.02 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| repldb |
| test |
+--------------------+
rows in set (0.06 sec)
mysql> use repldb;
Database changed
mysql> create table repl_table(id int,email varchar(80),password varchar(40) not null);
Query OK, 0 rows affected (0.03 sec)
mysql> show tables;
+------------------+
| Tables_in_repldb |
+------------------+
| repl_table |
+------------------+
row in set (0.01 sec)
mysql> insert into repl_table(id,email,password) values(1,"master@163.com","qweasd");
Query OK, 1 row affected (0.00 sec)

复制代码

mysql> show variables like "%hostname%";
+---------------+-----------------------+
| Variable_name | Value |
+---------------+-----------------------+
| hostname | localhost.localdomain |
+---------------+-----------------------+
row in set (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| repldb |
| test |
+--------------------+
rows in set (0.05 sec)
mysql> use repldb;
Database changed
mysql> show tables;
+------------------+
| Tables_in_repldb |
+------------------+
| repl_table |
+------------------+
row in set (0.00 sec)
mysql> select * from repl_table;
+------+----------------+----------+
| id | email | password |
+------+----------------+----------+
| 1 | master@163.com | qweasd |
+------+----------------+----------+
row in set (0.08 sec)

复制代码

[root@bogon ~]# service mysqld stop
Shutting down MySQL.. SUCCESS!

复制代码

mysql> show variables like "%hostname%";
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 610
Current database: repldb
+---------------+-----------------------+
| Variable_name | Value |
+---------------+-----------------------+
| hostname | localhost.localdomain |
+---------------+-----------------------+
row in set (0.01 sec)

复制代码

mysql> insert into repl_table(id,email,password) values(2,"slave@163.com","qweasd");
Query OK, 1 row affected (0.06 sec)
mysql> use repldb;
Database changed
mysql> select * from repl_table;
+------+----------------+----------+
| id | email | password |
+------+----------------+----------+
| 1 | master@163.com | qweasd |
| 2 | slave@163.com | qweasd |
+------+----------------+----------+
rows in set (0.00 sec)

复制代码

[root@bogon ~]# service mysqld start
Starting MySQL. SUCCESS!
[root@bogon ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.5.37-log Source distribution
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> use repldb;
Database changed
mysql> select * from repl_table;
+------+----------------+----------+
| id | email | password |
+------+----------------+----------+
| 1 | master@163.com | qweasd |
| 2 | slave@163.com | qweasd |
+------+----------------+----------+
rows in set (0.02 sec)

复制代码