實驗用主機：

提供iscsi磁盤:172.16.103.1,提供iscsi磁盤

高可用主機:172.16.103.2，172.16.103.3

實驗拓撲：

實驗步驟：

一、配置172.16.103.1，輸出iscsi磁盤，創建的磁盤分區為/dev/sda3，在實際的使用環境中的通常為整個磁盤而非分區。

#?yum?install?-y?scsi-target-utils

#?service?tgtd?start

#?tgtadm?--lld?iscsi?--mode?target?--op?new?--tid?1?--targetname?iqn.2014-09.com.iscsi:t1??創建target

#?tgtadm?--lld?iscsi?--mode?target?--op?show??#查看創建的target

#?tgtadm?--lld?iscsi?--mode?logicalunit?--op?new?--tid?1?--lun?1?--backing-store?/dev/sda3

#?tgtadm?--lld?iscsi?--mode?target?--op?show???#查看lun創建的結果

#?tgtadm?--lld?iscsi?--mode?target?--op?bind?--tid?1?--initiator-address?172.16.0.0/16?#基于IP地址做訪問控制，授權給172.16.0.0/16網段的主機訪問。

二、配置前端的高可用節點，發現并使用該磁盤設備：

#?yum?install?-y?iscsi-initiator-utils

#?iscsiadm?-m?discovery?-t?st?-p?172.16.103.1

#?iscsiadm?-m?node?-T?iqn.2014-09.com.iscsi:t1?-p?172.16.103.1?-l

此時在磁盤信息中可以查看到新的磁盤信息，顯示的新磁盤為未創建分區的新磁盤：

[root@node1?~]#?fdisk?-l?/dev/sd[a-z]

Disk?/dev/sda:?128.8?GB,?128849018880?bytes

255?heads,?63?sectors/track,?15665?cylinders

Units?=?cylinders?of?16065?*?512?=?8225280?bytes

Sector?size?(logical/physical):?512?bytes?/?512?bytes

I/O?size?(minimum/optimal):?512?bytes?/?512?bytes

Disk?identifier:?0x000652c0

Device?Boot??????Start?????????End??????Blocks???Id??System

/dev/sda1???*???????????1??????????26??????204800???83??Linux

Partition?1?does?not?end?on?cylinder?boundary.

/dev/sda2??????????????26????????7859????62914560???8e??Linux?LVM

/dev/sda3????????????7859????????7990?????1059291???83??Linux

/dev/sda4????????????7991???????15665????61649437+???5??Extended

/dev/sda5????????????7991????????8122?????1060258+??83??Linux

Disk?/dev/sdb:?2154?MB,?2154000384?bytes

67?heads,?62?sectors/track,?1012?cylinders

Units?=?cylinders?of?4154?*?512?=?2126848?bytes

Sector?size?(logical/physical):?512?bytes?/?512?bytes

I/O?size?(minimum/optimal):?512?bytes?/?512?bytes

Disk?identifier:?0x00000000

將該磁盤分區創建為/dev/sdb1,所有的容量都分配給該磁盤分區，執行格式化操作：

#?mke2fs?-t?ext4?/dev/sdb1

#?mkdir?/mydata/data??#作為數據庫存儲數據的目錄

#?groupadd?-g?3306?mysql

#?useradd?-u?3306?-g?mysql?-s?/sbin/nologin?-M?mysql

#?chown?-R?mysql.mysql?/mydata/data

#?mount?/dev/sdb1?/mydata/data

三、使用二進制格式的MariaDB安裝mysql

#?tar?xf?mariadb-5.5.39-linux-x86_64.tar.gz?-C?/usr/local

#?ln?-sv?mariadb-5.5.39-linux-x86_64/?mysql

#?cd?mysql

#?chown?-R?root.mysql?./

#?scripts/mysql_install_db?--user=mysql?--datadir=/mydata/data

#?mkdir?/etc/mysql

#?cp?support-files/my-large.cnf?/etc/mysql/my.cnf

#?vim?/etc/mysql/my.cnf

datadir?=?/mydata/data

#?cp?support-files/mysql.server?/etc/rc.d/init.d/mysqld

#?chmod?+x?/etc/rc.d/init.d/mysqld

#?mount?/dev/sdb1?/mydata/data

#?service?mysqld?start

#?/usr/local/mysql/bin/mysql??#連接數據庫測試

>?CREATE?DATABASE?tdb;?#創建一個數據庫用于驗證其他節點掛載同一磁盤時是否可以使用相同的數據

另一個節點的數據庫安裝方式相同，就不在重復了。

四、使用ansible安裝corosync+pacemaker+crmsh：

在配置高可用集群之前一定要先確定數據庫和iscsi磁盤未掛載！

使用crmsh配置時的具體步驟為：

crm(live)configure#?property?stonith-enabled=false

crm(live)configure#?property?no-quorum-policy=ignore

crm(live)configure#?primitive?myip?ocf:heartbeat:IPaddr?params?ip=172.16.103.25

crm(live)configure#?primitive?mystore?ocf:heartbeat:Filesystem?params?device=/dev/sdb1?directory=/mydata/data?fstype=ext4?op?start?timeout=60s?op?stop?timeout=60s

crm(live)configure#?primitive??mysql?lsb:mysqld

crm(live)configure#?group?myservice?myip?mystore?mysql

crm(live)configure#?order?myip_before_mystore_before_mysql?mandatory:?myip?mystore?mysql

crm(live)configure#?verify

crm(live)configure#?commit

配置完成后查看資源啟動的狀態：

crm(live)#?status

Last?updated:?Sun?Sep??7?18:09:00?2014

Last?change:?Sun?Sep??7?18:08:47?2014?via?crm_attribute?on?node2.cluster.com

Stack:?classic?openais?(with?plugin)

Current?DC:?node1.cluster.com?-?partition?with?quorum

Version:?1.1.10-14.el6-368c726

2?Nodes?configured,?2?expected?votes

3?Resources?configured

Node?node2.cluster.com:?standby

Online:?[?node1.cluster.com?]

Resource?Group:?myservice

myip(ocf::heartbeat:IPaddr):Started?node1.cluster.com

mystore(ocf::heartbeat:Filesystem):Started?node1.cluster.com

mysql(lsb:mysqld):Started?node1.cluster.com

當前資源運行在node1上，使用ifconfig命令可以查看ip地址配置的結果以及測試連接MySQL測試數據庫是否可用。

[root@node1?~]#?ip?addr?show

1:?lo:??mtu?16436?qdisc?noqueue?state?UNKNOWN

link/loopback?00:00:00:00:00:00?brd?00:00:00:00:00:00

inet?127.0.0.1/8?scope?host?lo

inet6?::1/128?scope?host

valid_lft?forever?preferred_lft?forever

2:?eth0:??mtu?1500?qdisc?pfifo_fast?state?UP?qlen?1000

link/ether?00:0c:29:e1:37:51?brd?ff:ff:ff:ff:ff:ff

inet?172.16.103.2/16?brd?172.16.255.255?scope?global?eth0

inet?172.16.103.25/16?brd?172.16.255.255?scope?global?secondary?eth0

inet6?fe80::20c:29ff:fee1:3751/64?scope?link

valid_lft?forever?preferred_lft?forever

[root@node1?~]#?mysql

Welcome?to?the?MySQL?monitor.??Commands?end?with?;?or?\g.

Your?MySQL?connection?id?is?2

Server?version:?5.1.71?Source?distribution

Copyright?(c)?2000,?2013,?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>

可以看到IP地址172.16.103.25配置在eth0上，mysql數據庫連接也正常。如果切換node1為standby模式，資源是否會轉移，測試結果為：

crm(live)#?status

Last?updated:?Sun?Sep??7?18:14:33?2014

Last?change:?Sun?Sep??7?18:14:27?2014?via?crm_attribute?on?node1.cluster.com

Stack:?classic?openais?(with?plugin)

Current?DC:?node1.cluster.com?-?partition?with?quorum

Version:?1.1.10-14.el6-368c726

2?Nodes?configured,?2?expected?votes

3?Resources?configured

Node?node1.cluster.com:?standby

Online:?[?node2.cluster.com?]

Resource?Group:?myservice

myip(ocf::heartbeat:IPaddr):Started?node2.cluster.com

mystore(ocf::heartbeat:Filesystem):Started?node2.cluster.com

mysql(lsb:mysqld):Started?node2.cluster.com

可以看到資源都運行在了node2上。

總結

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