基於Drbd+Corosync構建高可用Mysql服務器

時間 2020-02-08

標籤基於 drbd+corosync drbd corosync 構建可用 mysql 服務器欄目 MySQL 简体版

原文原文鏈接

***********************************************node

1、準備實驗環境mysql

2、安裝corosync+cmanlinux

3、Drbd的安裝於配置nginx

4、安裝Mysql服務器web

5、使用corosync+crm定義資源sql

6、測試mysql是不是高可用vim

************************************************服務器

1、準備實驗環境網絡

一、服務器IP地址規劃dom

Drbd1:172.16.10.3

Drbd1:172.16.10.4

二、服務器操做系統

Drbd1：Centos 6.4 x86_64

Drbd2：Centos 6.4 x86_64

三、修改主機名以及hosts文件

####drbd1 server############
sed -i 's@\(HOSTNAME=\).*@\1drbd1@g' /etc/sysconfig/network
hostname drbd1
[root@drbd1 ~]# echo "172.16.10.3 drbd1" >> /etc/hosts
[root@drbd1 ~]# echo "172.16.10.4 drbd2" >> /etc/hosts
[root@drbd1 ~]# ssh-keygen -t rs
[root@drbd1 ~]# ssh-copy-id -i .ssh/id_rsa.pub drbd2
[root@drbd1 ~]# scp /etc/hosts drbd2:/etc/
####drbd2 server############
sed -i 's@\(HOSTNAME=\).*@\1drbd2@g' /etc/sysconfig/network
hostname drbd2
[root@drbd2 ~]# ssh-keygen -t rsa
[root@drbd2 ~]# ssh-copy-id -i .ssh/id_rsa.pub drbd1

四、建立Drbd磁盤分區規劃

在drbd1與drbd2上建立磁盤分區（sda3）大小爲5G，相信這個對你們來講都很easy，此處就省略了。注意在Centos6系統上必須重啓系統，內核才能讀到分區信息

2、安裝Corosync+Crm

一、安裝Corosync

###########drbd1#############
[root@drbd1 ~]# yum install corosync -y
###########drbd2#############
[root@drbd2 ~]# yum install corosync -y

二、配置Corosync

[root@drbd1 ~]# cd /etc/corosync/
[root@drbd1 corosync]# cp corosync.conf.example corosync.conf
[root@drbd1 corosync]# vim corosync.conf
# Please read the corosync.conf.5 manual page
compatibility: whitetank
totem {
        version: 2
        secauth: off
        threads: 0
        interface {
# Please read the corosync.conf.5 manual page
compatibility: whitetank
totem {
        version: 2
        secauth: off
# Please read the corosync.conf.5 manual page
compatibility: whitetank
totem {
        version: 2
        secauth: on   #開啓認證功能
        threads: 0
        interface {
                ringnumber: 0
                bindnetaddr: 172.16.0.0         #修改成本機的網絡地址
                mcastaddr: 226.94.1.1
                mcastport: 5405
                ttl: 1
        }
}
logging {
        fileline: off
        to_stderr: no
        to_logfile: yes
        to_syslog: yes
        logfile: /var/log/cluster/corosync.log
        debug: off
        timestamp: on
        logger_subsys {
                subsys: AMF
                debug: off
        }
}
amf {
        mode: disabled
}
####添加如下幾行
service {
  ver:  0
  name: pacemaker
  # use_mgmtd: yes
   }
   aisexec {
     user: root
       group:  root
}

三、生成節點間通訊時用到的認證密鑰文件並將祕鑰以及配置文件copy到drbd2

[root@drbd1 corosync]# corosync-keygen
Corosync Cluster Engine Authentication key generator.
Gathering 1024 bits for key from /dev/random.
Press keys on your keyboard to generate entropy.
Writing corosync key to /etc/corosync/authkey.
[root@drbd1 corosync]# scp corosync.conf authkey drbd2:/etc/corosync/

四、爲兩個節點建立corosync生成的日誌所在的目錄

[root@drbd1 corosync]# mkdir -pv /var/log/cluster
[root@drbd1 corosync]# ssh drbd2 "mkdir -pv /var/log/cluster"

五、安裝Crmsh

[root@drbd1 ~]# wget ftp://195.220.108.108/linux/opensuse/factory/repo/oss/suse/x86_64/crmsh-1.2.6-0.rc2.1.1.x86_64.rpm
[root@drbd1 ~]# wget ftp://195.220.108.108/linux/opensuse/factory/repo/oss/suse/noarch/pssh-2.3.1-6.1.noarch.rpm
[root@drbd1 ~]# yum localinstall --nogpgcheck crmsh*.rpm pssh*.rpm -y
[root@drbd1 ~]# scp crmsh-1.2.6-4.el6.x86_64.rpm pssh-2.3.1-6.1.noarch.rpm drbd2:/root/
[root@drbd1 ~]# ssh drbd2 "yum localinstall --nogpgcheck crmsh*.rpm pssh*.rpm -y"qid

六、啓動Corosync

[root@drbd1 ~]# /etc/init.d/corosync start
#啓動以後沒有報錯，啓動節點2
[root@drbd1 ~]# ssh drbd2 "/etc/init.d/corosync start"

七、查看集羣節點的啓動狀態

[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 11:06:54 2013
Last change: Thu Sep 19 11:03:21 2013 via crmd on drbd1
Stack: classic openais (with plugin)
Current DC: drbd2 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
0 Resources configured.
Online: [ drbd1 drbd2 ]                  #drbd1與drbd2都在線
You have new mail in /var/spool/mail/root
[root@drbd1 ~]#

Drbd共有兩部分組成：內核模塊和用戶空間的管理工具。其中drbd內核模塊代碼已經整合進Linux內核2.6.33之後的版本中，所以，若是您的內核版本高於此版本的話，你只須要安裝管理工具便可；不然，您須要同時安裝內核模塊和管理工具兩個軟件包，而且此二者的版本號必定要保持對應。

目前適用CentOS 5的drbd版本主要有8.0、8.二、8.3三個版本，其對應的rpm包的名字分別爲drbd, drbd82和drbd83，對應的內核模塊的名字分別爲kmod-drbd, kmod-drbd82和kmod-drbd83。而適用於CentOS 6的版本爲8.4，其對應的rpm包爲drbd和drbd-kmdl，但在實際選用時，要切記兩點：drbd和drbd-kmdl的版本要對應；另外一個是drbd-kmdl的版本要與當前系統的內容版本相對應。咱們實驗所用的平臺爲x86_64且系統爲CentOS 6.4，所以須要同時安裝內核模塊和管理工具。咱們這裏選用最新的8.4的版本(drbd-8.4.3-33.el6.x86_64.rpm和drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm)，下載地址爲ftp://rpmfind.net/linux/atrpms/，請按照須要下載。

3、Drbd的安裝於配置

一、安裝Drbd軟件包

[root@drbd1 ~]# wget ftp://195.220.108.108/linux/atrpms/el6-x86_64/atrpms/stable/drbd-8.4.3-33.el6.x86_64.rpm
[root@drbd1 ~]# wget ftp://195.220.108.108/linux/atrpms/el6-x86_64/atrpms/stable/drbd-kmdl-2.6.32-358.6.2.el6-8.4.3-33.el6.x86_64.rpm
[root@drbd1 ~]# rpm -ivh drbd-8.4.3-33.el6.x86_64.rpm drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm
warning: drbd-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEY
Preparing...                ########################################### [100%]
   1:drbd-kmdl-2.6.32-358.el########################################### [ 50%]
   2:drbd                   ########################################### [100%]
[root@drbd1 ~]# scp drbd-* drbd2:/root/
drbd-8.4.3-33.el6.x86_64.rpm                                                            100%  283KB 283.3KB/s   00:00
drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm                                        100%  145KB 145.2KB/s   00:00
[root@drbd1 ~]# ssh drbd2 " rpm -ivh drbd-8.4.3-33.el6.x86_64.rpm drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm "
warning: drbd-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEY
Preparing...                ##################################################
drbd-kmdl-2.6.32-358.el6    ##################################################
drbd                        ##################################################
[root@drbd1 ~]#

二、修改Drbd的主配置文件爲

[root@drbd1 ~]# vim /etc/drbd.d/global_common.conf
global {
        usage-count no;
        # minor-count dialog-refresh disable-ip-verification
}
common {
        protocol C;
        handlers {
                pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
                pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
                local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
                # fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
                # split-brain "/usr/lib/drbd/notify-split-brain.sh root";
                # out-of-sync "/usr/lib/drbd/notify-out-of-sync.sh root";
                # before-resync-target "/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";
                # after-resync-target /usr/lib/drbd/unsnapshot-resync-target-lvm.sh;
        }
        startup {
                #wfc-timeout 120;
                #degr-wfc-timeout 120;
        }
        disk {
                on-io-error detach;
                #fencing resource-only;
        }
        net {
                cram-hmac-alg "sha1";
                shared-secret "mydrbdlab";
        }
        syncer {
                rate 1000M;
        }
}

三、定義一個資源名稱爲drbd

[root@drbd1 ~]# vim /etc/drbd.d/web.res
resource drbd {
  on drbd1 {
    device    /dev/drbd0;
    disk      /dev/sda3;
    address   172.16.10.3:7789;
    meta-disk internal;
  }
  on drbd2 {
    device    /dev/drbd0;
    disk      /dev/sda3;
    address   172.16.10.4:7789;
    meta-disk internal;
  }
}

四、將配置文件copy到Drbd2

[root@drbd1 ~]# cd /etc/drbd.d/
[root@drbd1 drbd.d]# scp global_common.conf web.res drbd2:/etc/drbd.d/
global_common.conf                                                                      100% 1401     1.4KB/s   00:00
web.res                                                                                 100%  266     0.3KB/s   00:00
[root@drbd1 drbd.d]#

五、在兩個節點上初始化已定義的資源並啓動服務

[root@drbd1 ~]# drbdadm create-md drbd
NOT initializing bitmap
Writing meta data...
initializing activity log
New drbd meta data block successfully created.
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
[root@drbd1 ~]# ssh drbd2 "drbdadm create-md drbd"
NOT initializing bitmap
Writing meta data...
initializing activity log
New drbd meta data block successfully created.
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
[root@drbd1 ~]#/etc/init.d/drbd start
[root@drbd2 ~]# /etc/init.d/drbd start

六、查看Drbd狀態信息

[root@drbd1 ~]# drbd-overview
  0:drbd/0  Connected Secondary/Secondary Inconsistent/Inconsistent C r-----
[root@drbd1 ~]#

從上面的信息中能夠看出此時兩個節點均處於Secondary狀態。因而，咱們接下來須要將其中一個節點設置爲Primary。

七、設置drbd的節點爲主節點

[root@drbd1 ~]# drbdadm primary --force drbd
[root@drbd1 ~]# drbd-overview #查看開始同步數據
  0:drbd/0  SyncSource Primary/Secondary UpToDate/Inconsistent C r-----
    [>....................] sync'ed:  2.9% (4984/5128)M
[root@drbd1 ~]# drbd-overview  #在此查看同步完成
  0:drbd/0  Connected Primary/Secondary UpToDate/UpToDate C r-----
[root@drbd1 ~]#

八、建立文件系統並格式化

[root@drbd1 ~]# mkdir -pv /mydata
[root@drbd1 ~]# mkfs.ext4 /dev/drbd0

九、掛載文件系統，查看狀態

[root@drbd1 ~]# mount /dev/drbd0 /mydata/
[root@drbd1 ~]# drbd-overview
  0:drbd/0  Connected Primary/Secondary UpToDate/UpToDate C r----- /mydata ext4 5.0G 139M 4.6G 3%
[root@drbd1 ~]#

4、安裝Mysql服務器

一、drbd1上安裝（drbd主節點）

[root@drbd1 ~]# useradd -r -u 306 mysql
[root@drbd1 ~]# tar xf mysql-5.5.33-linux2.6-x86_64.tar.gz -C /usr/local/
[root@drbd1 ~]# cd /usr/local/
[root@drbd1 local]# ln -sv mysql-5.5.33-linux2.6-x86_64/ mysql
`mysql' -> `mysql-5.5.33-linux2.6-x86_64/'
[root@drbd1 local]# cd mysql
[root@drbd1 mysql]# chown root.mysql -R *
[root@drbd1 mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/mydata/data/
[root@drbd1 mysql]# cp support-files/my-large.cnf /etc/my.cnf
[root@drbd1 mysql]# cp support-files/mysql.server /etc/init.d/mysqld
[root@drbd1 mysql]# vim /etc/my.cnf
thread_concurrency = 8
datadir=/mydata/data    #指定數據目錄
[root@drbd1 mysql]# stervice mysqld start

注意：安裝mysql（drbd2）以前須要卸載文件系統並降級

[root@drbd1 mysql]#start mysqld stop
[root@drbd1 mysql]# umount /mydata/
[root@drbd1 mysql]# drbdadm secondary drbd    #資源降級

二、drbd2安裝

[root@drbd2 ~]# useradd -r -u 306 mysql
[root@drbd2 ~]# drbdadm primary drbd
[root@drbd2 ~]# mkdir -pv /mydata/
[root@drbd2 ~]# chown -R mysql.mysql /mydata/
[root@drbd2 ~]# mount /dev/drbd0 /mydata/
[root@drbd2 ~]#useradd -r -u 306 mysql
[root@drbd2 ~]#tar xf mysql-5.5.33-linux2.6-x86_64.tar.gz -C /usr/local/
[root@drbd2 ~]# cd /usr/local/
[root@drbd2 local]# ln -sv mysql-5.5.33-linux2.6-x86_64/ mysql
[root@drbd2 local]#cd mysql
[root@drbd2 mysql]# chown root:mysql * -R
[root@nginx2 mysql]# cp support-files/my-large.cnf /etc/my.cnf
[root@nginx2 mysql]# cp support-files/mysql.server /etc/init.d/mysqld

三、注意要測試mysql是否能正常啓動

[root@drbd2 ~]# mount /dev/drbd0 /mydata/
[root@drbd2 ~]#service mysqld start

若是啓動正常將繼續下面的操做

[root@drbd2 ~]#service mysqld stop
[root@drbd2 ~]#umount /mydata
[root@drbd2 ~]#chkconfig mysqld off
[root@drbd2 ~]#ssh drbd1 "chkconfig mysqld off"

5、使用corosync+crm定義資源

[root@drbd1 ~]# crm conf
crm(live)configure# property no-quorum-policy=ignore
crm(live)configure# commit
crm(live)configure# primitive webdrbd ocf:linbit:drbd params drbd_resource=drbd op monitor role=Master interval=10 timeout=20 op monitor role=Slave interval=20 timeout=20 op start timeout=240  op stop timeout=100
crm(live)configure# verify
crm(live)configure# master ms_webdrbd  webdrbd meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true"
crm(live)configure# verify
crm(live)configure# commit
crm(live)configure# exit

註釋：

行4：定義了drbd的資源，並設置狀態監控

行9：定義了drbd主節點的資源，並設置了狀態監控

一、查看資源的狀態

[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 15:49:41 2013
Last change: Thu Sep 19 15:49:31 2013 via cibadmin on drbd1
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ drbd1 drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd1 ]
     Slaves: [ drbd2 ]

若是出現上述的結果，表示正常，若有問題，請檢查操做步驟，此時drbd已經能夠自動主從切換了

1.一、測試節點是否能正常切換

[root@drbd1 ~]# crm node standby            #drbd成爲備用節點
[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 15:54:19 2013
Last change: Thu Sep 19 15:54:13 2013 via crm_attribute on drbd1
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Node drbd1: standby
Online: [ drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd2 ]                     #切換到drbd2上
     Stopped: [ webdrbd:1 ]
[root@drbd1 ~]#

[root@drbd1 ~]# crm node online          #drbd1上線
[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 15:55:37 2013
Last change: Thu Sep 19 15:55:31 2013 via crm_attribute on drbd1
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ drbd1 drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd2 ]
     Slaves: [ drbd1 ]                #drbd1上線成功
[root@drbd1 ~]#

二、定義mysql資源並定義約束

[root@drbd1 ~]# crm confi
crm(live)configure# primitive mystore ocf:heartbeat:Filesystem params device="/dev/drbd0" directory="/mydata" fstype=ext4 op monitor interval=40 timeout=40 op start timeout=60 op stop timeout=60
crm(live)configure# verify
crm(live)configure# primitive myip ocf:heartbeat:IPaddr params ip="172.16.10.8" op monitor interval=20 timeout=20 on-fail=restart
crm(live)configure# verify
crm(live)configure# primitive myserver lsb:mysqld op monitor interval=20 timeout=20 on-fail=restart
crm(live)configure# verify
crm(live)configure# exit

註釋：

行2：定義了文件系統資源，用於過載drbd，並設置監控時長

行6：定義虛擬IP，並設置監控

行8：定義mysql服務的資源，並設置監控時長

三、查看資源狀態

[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 16:05:58 2013
Last change: Thu Sep 19 16:05:19 2013 via cibadmin on drbd1
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
5 Resources configured.
Online: [ drbd1 drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd2 ]
     Slaves: [ drbd1 ]
 myip   (ocf::heartbeat:IPaddr):    Started drbd1
 mystore    (ocf::heartbeat:Filesystem):    Started drbd2
Failed actions:
    myserver_start_0 (node=drbd1, call=149, rc=1, status=complete): unknown error
    mystore_start_0 (node=drbd1, call=141, rc=1, status=complete): unknown error
    myserver_start_0 (node=drbd2, call=143, rc=1, status=complete): unknown error

此時出現了一點點小問題那麼咱們就解決

[root@drbd1 ~]# crm resource cleanup mystore
[root@drbd1 ~]# crm resource cleanup myserver

四、此時在查看資源狀態，已然正常

[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 16:07:39 2013
Last change: Thu Sep 19 16:07:31 2013 via crmd on drbd2
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
5 Resources configured.
Online: [ drbd1 drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd2 ]
     Slaves: [ drbd1 ]
 myip   (ocf::heartbeat:IPaddr):    Started drbd1
 myserver   (lsb:mysqld):   Started drbd2
 mystore    (ocf::heartbeat:Filesystem):    Started drbd2
[root@drbd1 ~]#

此時資源沒有運行在同一個節點上，顯然是不符合實際須要的咱們經過定義排列約束，將全部資源運行在同一個節點上

crm(live)configure#  colocation mystore_with_ms_webdrbd inf: mystore ms_webdrbd:Master
crm(live)configure# verify
crm(live)configure# colocation myserver_with_mystore_with_myip inf: myserver mystore myip
crm(live)configure# verify
crm(live)configure#

五、再此查看是否運行中同一個節點上

[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 16:18:20 2013
Last change: Thu Sep 19 16:17:52 2013 via cibadmin on drbd1
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
5 Resources configured.
Online: [ drbd1 drbd2 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd2 ]
     Slaves: [ drbd1 ]
 myip   (ocf::heartbeat:IPaddr):    Started drbd2
 myserver   (lsb:mysqld):   Started drbd2
 mystore    (ocf::heartbeat:Filesystem):    Started drbd2
[root@drbd1 ~]#

由上看出已然運行在同一節點上

六、此時資源之間並無啓動順序，定義排列約束

crm(live)configure#  order ms_webdrbd_before_mystore inf: ms_webdrbd:promote mystore:start
crm(live)configure# show xml
crm(live)configure# verify
crm(live)configure# commit
crm(live)configure# show xml
crm(live)configure# order mystore_before_myserver inf: mystore:start myserver:start
crm(live)configure# verify
crm(live)configure# order myserver_before_myip  inf: myserver:start myip:start
crm(live)configure# verify
crm(live)configure# commit

6、測試mysql是不是高可用

一、模擬節點故障並查看狀態

[root@drbd1 ~]# ssh drbd2 "crm node standby"   #將drbd2設置爲備用節點
[root@drbd1 ~]# crm status
Last updated: Thu Sep 19 16:29:10 2013
Last change: Thu Sep 19 16:28:50 2013 via crm_attribute on drbd2
Stack: classic openais (with plugin)
Current DC: drbd1 - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
5 Resources configured.
Node drbd2: standby
Online: [ drbd1 ]
 Master/Slave Set: ms_webdrbd [webdrbd]
     Masters: [ drbd1 ]           #資源已經轉移
     Stopped: [ webdrbd:1 ]
 myip   (ocf::heartbeat:IPaddr):    Started drbd1      
 myserver   (lsb:mysqld):   Started drbd1
 mystore    (ocf::heartbeat:Filesystem):    Started drbd1
[root@drbd1 ~]#

二、模擬mysql服務出現故障

[root@drbd1 ~]# service mysqld stop
#####使用watch命令動態查看mysql端口####
[root@drbd1 ~]# watch "netstat -anpt | grep 3306"
Every 2.0s: netstat -anpt | grep 3306                                                             Thu Sep 19 17:17:45 2013
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN  36400/mysqld

當mysql服務中止以後，corosync會自動啓動mysql，實現了mysql的高可用！！！

總結：

爲了保證明驗的成功，提醒你們在建立mysql用戶時應該保證在兩臺服務器的mysql用戶的UID相同，以避免致使Mysql服務不能啓動；在定義資源約束時，必定要定義合理，否則有可能在資源轉移的時候出現問題，致使資源不能啓動。

本博客至此結束，若有問題，望你們多提寶貴意見。歡迎你們一塊兒來探討高可用的相關話題！！！