1.安装共享存储需要的软件（yum源必须高级）

yum install scsi-* -y

2.在rhcs1上安装客户端iscsi-*

yum install iscsi-* -y

rhcs2操作相同

yum install iscsi-* -y

3.给rhcs3上添加一块硬盘，用来共享

fdisk -l(发现vda出现)

4.在文件里配置共享策略,开启服务，查看

vim /etc/tgt/targets.conf
38 <target iqn.2019-04.com.example:server.target1>
39     backing-store /dev/vda
40 </target>

/etc/init.d/tgtd start
Starting SCSI target daemon:                               [  OK  ]
tgt-admin -s		#查看信息
ps ax
1056 ?        Ssl    0:00 tgtd
1059 ?        S      0:00 tgtd
1090 pts/0    R+     0:00 ps ax

5.在rhcs1和rhcs2上查看共享出的存储

iscsiadm -m discovery -t st -p 172.25.80.3
Starting iscsid:                                           [  OK  ]
172.25.80.3:3260,1 iqn.2019-04.com.example:server.target1

iscsiadm -m discovery -t st -p 172.25.8.3
Starting iscsid:                                           [  OK  ]
172.25.80.3:3260,1 iqn.2019-04.com.example:server.target1

6.在rhcs3上设置共享策略

vim /etc/tgt/targets.conf
38 <target iqn.2019-04.com.example:server.target1>
39     backing-store /dev/vda
40     initiator-address 172.25.80.1	##只共享给172.25.80.1和2
41     initiator-address 172.25.80.2
42 </target>
/etc/init.d/tgtd restart		##重启服务

tgt-admin -s
ACL information:
172.25.8.1
172.25.8.2

7.重新发现一下存储

iscsiadm -m discovery -t st -p 172.25.8.3
172.25.8.3:3260,1 iqn.2019-04.com.example:server.target1
iscsiadm -m discovery -t st -p 172.25.8.3
172.25.8.3:3260,1 iqn.2019-04.com.example:server.target1

8.激活存储

iscsiadm -m node -l
iscsiadm -m node -l
fdisk -l(会发现sdb出现)
fdisk -l

9.确定信息正确

vim /etc/lvm/lvm.conf
462     locking_type = 3

10.格式化设备

mkfs.ext4 /dev/sdb

11.挂载，修改主与组

mount /dev/sdb /var/lib/mysql/
chown mysql.mysql /var/lib/mysql/
[root@server1 mysql]# ll -d /var/lib/mysql/
drwxr-xr-x 3 mysql mysql 4096 Apr 20 14:46 /var/lib/mysql/

12.开启mysql，产生新的文件

/etc/init.d/mysqld start

13.停止服务，卸载磁盘

/etc/init.d/mysqld stop
Stopping mysqld:                                           [  OK  ]
[root@server1 mysql]# umount /var/lib/mysql/
umount: /var/lib/mysql: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

14.在网页上关闭apache服务，查询

[root@server1 ~]# clustat
Cluster Status for westos_ha @ Sat Apr 23 14:51:27 2019
Member Status: Quorate

Member Name                                 ID   Status
------ ----                                 ---- ------
server1                                         1 Online, Local, rgmanager
server2                                         2 Online, rgmanager

Service Name                       Owner (Last)                       State
------- ----                       ----- ------                       -----
service:apache                     (server1)                          disabled

15.网页配置见截图

16.测试

server2上mysql -p