[优化篇]Ubuntu使用corosync+pacemaker+drbd实现MySQL的HA(2)

1、配置MySQL(1+2)

在安装mysql数据库时，系统会提示设置你的root密码，例如我的root密码为root。

设置my.cnf

sed -i 's/127.0.0.1/0.0.0.0/g' /etc/mysql/my.cnf

重启mysql服务

连接mysql，设置远程root用户连接和删除空用户

mysql -uroot -p
grant all privileges on *.* to root@"%" identified by "root" with grant option;
FLUSH PRIVILEGES;
delete from mysql.user where user="";
quit;

停止mysql服务

2、将mysql生成的数据文件迁移到drbd0设备去（1）

drbdadm primary mysql
drbd-overview
mount /dev/drbd0 /data/mysql
cp -R -p /var/lib/mysql /data/mysql

3、由于数据文件发生变化，需要修改相应的配置文件（1+2）

sed -i 's/2345/!0123456/g' /etc/init/mysql.conf
sed -i -e '/datadir/cdatadir         = \/data\/mysql\/mysql'  /etc/mysql/my.cnf
sed -i '/\/var\/lib\/mysql\/ /c\/data\/mysql\/mysql\/ r,' /etc/apparmor.d/usr.sbin.mysqld
sed -i '/\/var\/lib\/mysql\/\*\* rwk/c\/data\/mysql\/mysql\/** rwk,' /etc/apparmor.d/usr.sbin.mysqld

4、测试（1）

service mysql start
mysql -uroot -p
CREATE DATABASE test1;
quit
service mysql stop
umount /dev/drbd0
drbdadm secondary mysql

5、测试（2）

查看数据库中是否包括了新创建的test1

drbdadm primary mysql
mount /dev/drbd0 /mydata/
service mysql start
mysql -uroot -proot -e 'show databases;'
service mysql stop
umount /dev/drbd0
drbdadm secondary mysql

6、设置mysql1为primary（1）

7、停止drbd服务（1+2）

8、设置pacemaker(1)

root@mysql1:~# crm configure
crm(live)configure# property stonith-enabled=false
crm(live)configure# commit
crm(live)configure# property no-quorum-policy=ignore
crm(live)configure# commit
crm(live)configure# primitive mysqldrbd ocf:heartbeat:drbd params drbd_resource=mysql op start timeout=240 op stop timeout=100 op monitor role=Master interval=20 timeout=30 op monitor role=Slave interval=30 timeout=30
crm(live)configure# ms ms_mysqldrbd mysqldrbd meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
crm(live)configure# commit
crm(live)configure# exit
bye
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:10:37 2015
Last change: Fri Aug 14 09:10:28 2015 via cibadmin on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
2 Resources configured

Online: [ mysql1 mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql2 ]
Slaves: [ mysql1 ]
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:11:16 2015
Last change: Fri Aug 14 09:10:28 2015 via cibadmin on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
2 Resources configured

Online: [ mysql1 mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql2 ]
Slaves: [ mysql1 ]
root@mysql1:~# crm configuate
crm(live)configure# primitive mystore ocf:heartbeat:Filesystem params device=/dev/drbd0 directory=/data/mysql fstype=ext4 op start timeout=60 op stop timeout=60
crm(live)configure# colocation mystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Master
crm(live)configure# order mystore_after_ms_mysqldrbd mandatory: ms_mysqldrbd:promote mystore:start
crm(live)configure# commit
crm(live)configure# exit
bye
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:13:32 2015
Last change: Fri Aug 14 09:13:24 2015 via cibadmin on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
3 Resources configured

Online: [ mysql1 mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql2 ]
Slaves: [ mysql1 ]
mystore    (ocf::heartbeat:Filesystem):    Started mysql2
root@mysql1:~# crm configuate
crm(live)configure# primitive mysql lsb:mysql
crm(live)configure# colocation mysql_with_mystore inf: mysql mystore
crm(live)configure# order mysql_after_mystore mandatory: mystore mysql
crm(live)configure# commit;
ERROR: syntax: commit;
crm(live)configure# commit
crm(live)configure# exit
bye
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:14:50 2015
Last change: Fri Aug 14 09:14:45 2015 via cibadmin on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
4 Resources configured

Online: [ mysql1 mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql2 ]
Slaves: [ mysql1 ]
mystore    (ocf::heartbeat:Filesystem):    Started mysql2
mysql  (lsb:mysql):    Started mysql2
root@mysql1:~# crm configuate
crm(live)configure# primitive vip ocf:heartbeat:IPaddr params ip=192.168.12.200 nic=eth0 cidr_netmask=255.255.254.0
crm(live)configure# colocation vip_with_ms_mysqldrbd inf: ms_mysqldrbd:Master vip
crm(live)configure# commit
crm(live)configure# quit
bye
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:16:03 2015
Last change: Fri Aug 14 09:15:54 2015 via cibadmin on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
5 Resources configured

Online: [ mysql1 mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql1 ]
Slaves: [ mysql2 ]
mystore    (ocf::heartbeat:Filesystem):    Started mysql1
mysql  (lsb:mysql):    Started mysql1
vip    (ocf::heartbeat:IPaddr):    Started mysql1

9、客户端验证（1或者2）

root@mysql1:~# mysql -uroot -p -h 192.168.12.200
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 37
Server version: 5.5.44-0ubuntu0.14.04.1 (Ubuntu)

Copyright (c) 2000, 2015, 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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test1              |
+--------------------+
4 rows in set (0.01 sec)

mysql> create database test2;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test1              |
| test2              |
+--------------------+
5 rows in set (0.00 sec)

mysql> exit
Bye

10、故障模拟

root@mysql1:~# crm
crm(live)# node
crm(live)node# show
mysql2(1084755047): normal
mysql1(1084755045): normal
crm(live)node# standby
crm(live)node# show
mysql2(1084755047): normal
mysql1(1084755045): normal
standby: on
crm(live)node# exit
bye
root@mysql1:~# crm status
Last updated: Fri Aug 14 09:17:52 2015
Last change: Fri Aug 14 09:17:34 2015 via crm_attribute on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
5 Resources configured

Node mysql1 (1084755045): standby
Online: [ mysql2 ]

Master/Slave Set: ms_mysqldrbd [mysqldrbd]
Masters: [ mysql2 ]
Stopped: [ mysql1 ]
mystore    (ocf::heartbeat:Filesystem):    Started mysql2
mysql  (lsb:mysql):    Started mysql2
vip    (ocf::heartbeat:IPaddr):    Started mysql2

我们可以看到，将mysql1设置为Standby之后，mysql已经运行在mysql2上了。