corosync+pacemaker+mysql+drbd 实现mysql的高可用
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一、了解各组件是什么以及之间的关系
二、安装高可用集群的提前
三、安装corosync+pacemaker
四、编译安装mysql
五、安装drbd
六、mysql与drbd实现mysql数据的镜像
七、利用crmsh配置mysql的高可用
====================================
环境：
OS：Centos 6.x(redhat 6.x)
kernel:2.6.32-358.el6.x86_64
yum源:
[centos]
name=sohu-centos
baseurl=http://mirrors.sohu.com/centos/$releasever/os/$basearch
gpgcheck=1
enable=0
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-6
[epel]
name=sohu-epel
baseurl=http://mirrors.sohu.com/fedora-epel/$releasever/$basearch/
enable=1
gpgcheck=0
拓扑图：
部分软件以附件的形式上传，mysql的源码包软件，网上很容易找
望各位博友带着下面的疑问去实现corosync+pacemaker+mysql+drbd mysql的高可用？
1、corosync是什么？pacemaker是什么？corosync与pacemaker的关系？
2、 mysql与drbd之间的连接关系？
3、 corosync、pacemaker、mysql、drbd之间的关系？
4、提到高可用集群，广大博友们就会想到，高可用集群中资源之间是如何建立关系？各个节点会不会抢占资源使其出现脑裂(split-brain)？
出现脑裂可以有fence设备自行解决
一、了解各组件是什么以及之间的关系
corosync：corosync的由来是源于一个Openais的项目，是Openais的一个子 项目，可以实现HA心跳信息传输的功能，是众多实现HA集群软件中之一，heartbeat与corosync是流行的Messaging Layer （集群信息层）工具。而corosync是一个新兴的软件，相比Heartbeat这款很老很成熟的软件，corosync与Heartbeat各有优势，博主就不在这里比较之间的优势了，corosync相对于Heartbeat只能说现在比较流行。
pacemaker：是众多集群资源管理器(Cluster Resource Manager)CRM中的一个，其主要功能是管理来着集群信息层发送来的信息。Pacemaker是集群的核心,它管理集群和集群信息. 集群信息更新通过Corosync通知到各个节点.
常见的CRM有:
heartbeat v1-->haresources
hearbeat v2--->crm
hearbeat v3---->pacemaker
RHCS(cman)----->rgmanager
如下图corosync与pacemaker之间的关系：
mysql：一个开源的关系型数据库
drbd：DRBD:(distributed replication block device)即分布式复制块设备。它的工作原理是：在A主机上有对指定磁盘设备写请求时，数据发送给A主机的kernel，然后通kernel中的一个模块，把相同的数据传送给B主机的kernel中一份，然后B主机再写入自己指定的磁盘设备，从而实现两主机数据的同步,也就实现了写操作高可用。类似于raid1一样，实现数据的镜像，DRBD一般是一主一从，并且所有的读写操作，挂载只能在主节点服务器上进行，，但是主从DRBD服务器之间是可以进行调换的。
各个组件之间的关系：其实mysql与drbd根本没有半毛钱的关系，而drbd与mysql相结合就有很重要的作用了，因为drbd实现数据的镜像，当drbd的主节点挂了之后，drbd的辅助节点还可以提供服务，但是主节点不会主动的切换到辅助的节点上面去，于是乎，高可用集群就派上用场了，因为资源定义为高可用的资源，主节点出现故障之后，高可用集群可以自动的切换到辅助节点上去，实现故障转移继续提供服务。
二、安装高可用集群的提前准备
1）、hosts文件
#把主机名改成jie2.com[root@jie2 ~]# sed -i s/`grep HOSTNAME /etc/sysconfig/network |awk -F '=' '{print $2}'`/jie2.com/g /etc/sysconfig/network #把主机名改成jie3.com[root@jie3 ~]# sed -i s/`grep HOSTNAME /etc/sysconfig/network |awk -F '=' '{print $2}'`/jie3.com/g /etc/sysconfig/network[root@jie2 ~]# cat >>/etc/hosts << EOF>172.16.22.2 jie2.com jie2>172.16.22.3 jie3.com jie3>EOF[root@jie3 ~]# cat >>/etc/hosts << EOF>172.16.22.2 jie2.com jie2>172.16.22.3 jie3.com jie3>EOF
2）、ssh互信
[root@jie2 ~]# ssh-keygen -t rsa -P ''[root@jie2 ~]# ssh-copy-id -i .ssh/id_rsa.pub jie3[root@jie3 ~]# ssh-keygen -t rsa -P ''[root@jie3 ~]# ssh-copy-id -i .ssh/id_rsa.pub jie2
3）、关闭NetworkManger
[root@jie2 ~]# chkconfig --del NetworkManager[root@jie2 ~]# chkconfig NetworkManager off[root@jie2 ~]# service NetworkManager stop[root@jie3 ~]# chkconfig --del NetworkManager[root@jie3 ~]# chkconfig NetworkManager off[root@jie3 ~]# service NetworkManager stop
4）、时间同步(博主用的是自己的ntp时间服务器)
[root@jie2 ~]#ntpdate 172.16.0.1[root@jie3 ~]#ntpdate 172.16.0.1
三、安装corosync+pacemaker
1）、安装corosync+pacemaker
#节点jie2.com的操作[root@jie2 ~]# yum -y install corosync pacemaker[root@jie2 ~]# yum -y --nogpgcheck install crmsh-1.2.6-4.el6.x86_64.rpm pssh-2.3.1-2.el6.x86_64.rpm #提供crmsh命令接口的软件 #节点jie3.com的操作[root@jie3 ~]# yum -y install corosync pacemaker[root@jie3 ~]# yum -y --nogpgcheck install crmsh-1.2.6-4.el6.x86_64.rpm pssh-2.3.1-2.el6.x86_64.rpm
2）、修改配置文件和生成认证文件
配置文件
#节点jie2.com的操作[root@jie2 ~]# cd /etc/corosync/[root@jie2 corosync]# mv corosync.conf.example corosync.conf[root@jie2 corosync]# vim corosync.conf# Please read the corosync.conf.5 manual pagecompatibility: whitetanktotem { #心跳信息传递层 version: 2 #版本 secauth: on #认证信息 一般on threads: 0 #线程 interface { #定义心跳信息传递的接口 ringnumber: 0 bindnetaddr: 172.16.0.0 #绑定的网络地址，写网络地址 mcastaddr: 226.94.1.1 #多播地址 mcastport: 5405 #多播的端口 ttl: 1 #生存周期 }}logging { #日志 fileline: off to_stderr: no #是否输出在屏幕上 to_logfile: yes #定义自己的日志 to_syslog: no #是否由syslog记录日志 logfile: /var/log/cluster/corosync.log #日志文件的存放路径 debug: off timestamp: on #时间戳是否关闭 logger_subsys { subsys: AMF debug: off }}amf { mode: disabled}service { ver: 0 name: pacemaker #pacemaker作为corosync的插件进行工作}aisexec { user: root group: root}[root@jie2 corosync]# scp corosync.conf jie3:/etc/corosync/##把节点jie2.com的配置文件copy到jie3.com中
认证文件
#节点jie2.com的操作[root@jie2 corosync]# corosync-keygenCorosync Cluster Engine Authentication key generator.Gathering 1024 bits for key from /dev/random.Press keys on your keyboard to generate entropy (bits = 152). #遇到这个情况，表示电脑的随机数不够，各位朋友可以不停的随便敲键盘，或者安装软件也可以生成随机数[root@jie2 corosync]# scp authkey jie3:/etc/corosync/ #把认证文件也复制到jie3.com主机上
3）、开启服务和查看集群中的节点信息
#节点jie2.com的操作[root@jie2 ~]# service corosync startStarting Corosync Cluster Engine (corosync): [ OK ][root@jie2 ~]# crm statusLast updated: Thu Aug 8 14:43:13 2013Last change: Sun Sep 1 16:41:18 2013 via crm_attribute on jie3.comStack: classic openais (with plugin)Current DC: jie3.com - partition with quorumVersion: 1.1.8-7.el6-394e9062 Nodes configured, 2 expected votesOnline: [ jie2.com jie3.com ] #节点jie3.com的操作[root@jie3 ~]# service corosync startStarting Corosync Cluster Engine (corosync): [ OK ][root@jie3 ~]# crm statusLast updated: Thu Aug 8 14:43:13 2013Last change: Sun Sep 1 16:41:18 2013 via crm_attribute on jie3.comStack: classic openais (with plugin)Current DC: jie3.com - partition with quorumVersion: 1.1.8-7.el6-394e9062 Nodes configured, 2 expected votesOnline: [ jie2.com jie3.com ]
四、编译安装mysql(两个节点的操作过程都是一样)
#节点jie2.com的操作#1)、解压编译安装[root@jie2 ~]# tar xf mysql-5.5.33.tar.gz[root@jie2 ~]# yum -y groupinstall "Development tools" "Server Platform Development"[root@jie2 ~]# cd mysql-5.5.33[root@jie2 mysql-5.5.33]# yum -y install cmake[root@jie2 mysql-5.5.33]# cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql \-DMYSQL_DATADIR=/mydata/data -DSYSCONFDIR=/etc \-DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_ARCHIVE_STORAGE_ENGINE=1 \-DWITH_BLACKHOLE_STORAGE_ENGINE=1 -DWITH_READLINE=1 -DWITH_SSL=system \-DWITH_ZLIB=system -DWITH_LIBWRAP=0 -DMYSQL_UNIX_ADDR=/tmp/mysql.sock \-DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci[root@jie2 mysql-5.5.33]# make && make install#2)、建立配置文件和脚本文件[root@jie2 mysql-5.5.33]# cp /usr/local/mysql/support-files/my-large.cnf /etc/my.cnf[root@jie2 mysql-5.5.33]# cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld[root@jie2 mysql-5.5.33]# cd /usr/local/mysql/[root@jie2 mysql]# useradd -r -u 306 mysql[root@jie2 mysql]# chown -R root:mysql ./*#3)、关联系统识别的路径[root@jie2 mysql]#echo "PATH=/usr/local/mysql/bin:$PATH" >/etc/profile.d/mysqld.sh[root@jie2 mysql]#source /etc/profile.d/mysqld.sh[root@jie2 mysql]#echo "/usr/local/mysql/lib" >/etc/ld.so.conf.d/mysqld.conf[root@jie2 mysql]#ldconfig -v | grep mysql[root@jie2 mysql]#ln -sv /usr/local/mysql/include/ /usr/local/mysqld
先别初始化数据库，安装drbd把drbd挂载到目录下，然后初始化数据库把数据库的数据存放到drbd挂载的目录。
五、安装drbd
安装rpm包的drbd软件必须保证找相同内核版本的drbd-kmdl软件
1）、先划分一个分区，此分区做成drbd镜像(RHEL 6.x的重新格式化一个新的分区之后要重启系统）
#节点jie2.com的操作[root@jie2 ~]# fdisk /dev/sdaCommand (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 3First cylinder (7859-15665, default 7859):Using default value 7859Last cylinder, +cylinders or +size{K,M,G} (7859-15665, default 15665): +5GCommand (m for help): w #节点jie3.com的操作[root@jie3 ~]# fdisk /dev/sdaCommand (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 3First cylinder (7859-15665, default 7859):Using default value 7859Last cylinder, +cylinders or +size{K,M,G} (7859-15665, default 15665): +5GCommand (m for help): w
2）、安装drbd和修改配置文件
#1)、安装drbd #节点jie2.com的操作[root@jie2 ~]# rpm -ivh drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpmwarning: drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEYPreparing... ################################# [100%][root@jie2 ~]# rpm -ivh drbd-8.4.3-33.el6.x86_64.rpmwarning: drbd-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEYPreparing... ################################## [100%] #节点jie3.com的操作[root@jie3 ~]# rpm -ivh drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpmwarning: drbd-kmdl-2.6.32-358.el6-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEYPreparing... ################################# [100%][root@jie3 ~]# rpm -ivh drbd-8.4.3-33.el6.x86_64.rpmwarning: drbd-8.4.3-33.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 66534c2b: NOKEYPreparing... ################################## [100%]#2)、修改drbd的配置文件 #节点jie2.com的操作[root@jie2 ~]# cd /etc/drbd.d/[root@jie2 drbd.d]# cat global_common.conf #全局配置文件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; }}[root@jie2 drbd.d]# cat mydata.res #资源配置文件resource mydata { on jie2.com { device /dev/drbd0; disk /dev/sda3; address 172.16.22.2:7789; meta-disk internal; } on jie3.com { device /dev/drbd0; disk /dev/sda3; address 172.16.22.3:7789; meta-disk internal; }} #把配置文件copy到节点jie3.com上面[root@jie2 drbd.d]# scp global_common.conf mydata.res jie3:/etc/drbd.d/
3）、初始化drbd的资源并启动
#节点jie2.com的操作#创建drbd的资源[root@jie2 ~]# drbdadm create-md mydataWriting meta data...initializing activity logNOT initializing bitmaplk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directoryNew drbd meta data block successfully created. #提示已经创建成功lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory#启动服务[root@jie2 ~]# service drbd startStarting DRBD resources: [ create res: mydata prepare disk: mydata adjust disk: mydata adjust net: mydata].......... [ok] #节点jie3.com的操作#创建drbd的资源[root@jie3 ~]# drbdadm create-md mydataWriting meta data...initializing activity logNOT initializing bitmaplk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directoryNew drbd meta data block successfully created. #提示已经创建成功lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory#启动服务[root@jie3 ~]# service drbd startStarting DRBD resources: [ create res: mydata prepare disk: mydata adjust disk: mydata adjust net: mydata].......... [ok]
4）、设置一个主节点，然后同步drbd的数据(此步骤只需在一个节点上操作)
#设置jie2.com为drbd的主节点[root@jie2 ~]# drbdadm primary --force mydata[root@jie2 ~]# cat /proc/drbd #查看同步进度version: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-05-27 04:30:21 0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---n- ns:1897624 nr:0 dw:0 dr:1901216 al:0 bm:115 lo:0 pe:3 ua:3 ap:0 ep:1 wo:f oos:207988 [=================>..] sync'ed: 90.3% (207988/2103412)K finish: 0:00:07 speed: 26,792 (27,076) K/sec[root@jie2 ~]# watch -n1 'cat /proc/drbd' 此命令可以动态的查看[root@jie2 ~]# cat /proc/drbdversion: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-05-27 04:30:21 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r----- ns:120 nr:354 dw:435 dr:5805 al:6 bm:9 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0 #当两边都为UpToDate时，表示两边已经同步
5）、格式化drdb分区(此步骤在主节点上操作)
[root@jie2 ~]# mke2fs -t ext4 /dev/drbd0
六、mysql与drbd实现mysql数据的镜像
1）、在drbd的主节点上，挂载drbd的分区，然后初始化数据库
[root@jie2 ~]# mkdir /mydata #创建用于挂载drbd的目录[root@jie2 ~]# mount /dev/drbd0 /mydata/[root@jie2 ~]# mkdir /mydata/data[root@jie2 ~]#chown -R mysql.mysql /mydata #把文件的属主和属组改成mysql[root@jie2 ~]#vim /etc/my.cnf #修改mysql的配置文件 datadir = /mydata/data innodb_file_per_table =1[root@jie2 ~]#/usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/mydata/data/ --basedir=/usr/local/mysql #初始化数据库[root@jie2 ~]# service mysqld startStarting MySQL ....... [ OK ]
2）、验证drbd是否镜像
#节点jie2.com的操作#1)、先在drbd的主节点上面创建一个数据库[root@jie2 ~]# mysqlmysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |+--------------------+4 rows in set (0.00 sec)mysql> create database jie2;Query OK, 1 row affected (0.01 sec)mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || jie2 || mysql || performance_schema || test |+--------------------+5 rows in set (0.00 sec)mysql>\q#2)、停掉mysql服务，卸载drbd挂载的目录[root@jie2 ~]# service mysqld stop[root@jie2 ~]# umount /dev/drbd0 #卸载drbd的挂载点[root@jie2 ~]# drbdadm secondary mydata #把此节点改为drbd的备用节点 #节点jie3.com的操作#3）、把jie3.com变为drbd的主节点[root@jie3 ~]#drbdadm primary mydata #把此节点改为drbd的主节点[root@jie3 ~]# mkdir /mydata[root@jie3 ~]#chown -R mysql.mysql /mydata[root@jie3 ~]#mount /dev/drdb0 /mydata[root@jie3 ~]#vim /etc/my.cnf datadir = /mydata/data innodb_file_per_table = 1[root@jie3 ~]# service mysqld start #此节点上不用初始化数据库，直接开启服务即可Starting MySQL ....... [ OK ][root@jie3 ~]# mysqlmysql> show databases; #可以看见jie2数据库+--------------------+| Database |+--------------------+| information_schema || jie2 || mysql || performance_schema || test |+--------------------+5 rows in set (0.00 sec)
七、利用crmsh配置mysql的高可用
需要定义集群资源而mysql、drbd都是集群的资源，由集群管理的资源开机是一定不能够自行启动的。
1）、关闭drbd的服务和关闭mysql的服务
[root@jie2 ~]#service mysqld stop[root@jie2 ~]#service drbd stop[root@jie3 ~]#service mysqld stop[root@jie3 ~]#umount /dev/drbd0 #之前drbd已经挂载到jie3.com节点上了[root@jie3 ~]#service drdb stop
2）、定义集群资源
定义drbd的资源(提供drbd的资源代理RA由OCF类别中的linbit提供）
[root@jie2 ~]# crmcrm(live)# configurecrm(live)configure# property stonith-enabled=falsecrm(live)configure# property no-quorum-policy=ignorecrm(live)configure# primitive mysqldrbd ocf:linbit:drbd params drbd_resource=mydata op monitor role=Master interval=10 timeout=20 op monitor role=Slave interval=20 timeout=20 op start timeout=240 op stop timeout=100crm(live)configure#verify #可以检查语法
定义drbd的主从资源
crm(live)configure# ms ms_mysqldrbd mysqldrbd meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=truecrm(live)configure# verify
定义文件系统资源和约束关系
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=60crm(live)configure# verifycrm(live)configure# colocation mystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Mastercrm(live)configure# order ms_mysqldrbd_before_mystore mandatory: ms_mysqldrbd:promote mystore:startcrm(live)configure# verify
定义vip资源、mysql服务的资源约束关系
crm(live)configure# primitive myvip ocf:heartbeat:IPaddr params ip="172.16.22.100" op monitor interval=20 timeout=20 on-fail=restartcrm(live)configure# primitive myserver lsb:mysqld op monitor interval=20 timeout=20 on-fail=restartcrm(live)configure# verifycrm(live)configure# colocation myserver_with_mystore inf: myserver mystorecrm(live)configure# order mystore_before_myserver mandatory: mystore:start myserver:startcrm(live)configure# verifycrm(live)configure# colocation myvip_with_myserver inf: myvip myservercrm(live)configure# order myvip_before_myserver mandatory: myvip myservercrm(live)configure# verifycrm(live)configure# commit
查看所有定义资源的信息
crm(live)configure# shownode jie2.com \ attributes standby="off"node jie3.com \ attributes standby="off"primitive myserver lsb:mysqld \ op monitor interval="20" timeout="20" on-fail="restart"primitive mysqldrbd ocf:linbit:drbd \ params drbd_resource="mydata" \ op monitor role="Master" interval="10" timeout="20" \ op monitor role="Slave" interval="20" timeout="20" \ op start timeout="240" interval="0" \ op stop timeout="100" interval="0"primitive mystore ocf:heartbeat:Filesystem \ params device="/dev/drbd0" directory="/mydata" fstype="ext4" \ op monitor interval="40" timeout="40" \ op start timeout="60" interval="0" \ op stop timeout="60" interval="0"primitive myvip ocf:heartbeat:IPaddr \ params ip="172.16.22.100" \ op monitor interval="20" timeout="20" on-fail="restart" \ meta target-role="Started"ms ms_mysqldrbd mysqldrbd \ meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true"colocation myserver_with_mystore inf: myserver mystorecolocation mystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Mastercolocation myvip_with_myserver inf: myvip myserverorder ms_mysqldrbd_before_mystore inf: ms_mysqldrbd:promote mystore:startorder mystore_before_myserver inf: mystore:start myserver:startorder myvip_before_myserver inf: myvip myserverproperty $id="cib-bootstrap-options" \ dc-version="1.1.8-7.el6-394e906" \ cluster-infrastructure="classic openais (with plugin)" \ expected-quorum-votes="2" \ stonith-enabled="false" \ no-quorum-policy="ignore"
查看资源运行的状态运行在jie3.com上
[root@jie2 ~]# crm statusLast updated: Thu Aug 8 17:55:30 2013Last change: Sun Sep 1 16:41:18 2013 via crm_attribute on jie3.comStack: classic openais (with plugin)Current DC: jie3.com - partition with quorumVersion: 1.1.8-7.el6-394e9062 Nodes configured, 2 expected votes5 Resources configured.Online: [ jie2.com jie3.com ] Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ jie3.com ] Slaves: [ jie2.com ] mystore (ocf::heartbeat:Filesystem): Started jie3.com myvip (ocf::heartbeat:IPaddr): Started jie3.com myserver (lsb:mysqld): Started jie3.com
切换节点，看资源是否转移
[root@jie3 ~]# crm node standby jie3.com #把此节点设置为备用节点[root@jie3 ~]# crm statusLast updated: Mon Sep 2 01:45:07 2013Last change: Mon Sep 2 01:44:59 2013 via crm_attribute on jie3.comStack: classic openais (with plugin)Current DC: jie3.com - partition with quorumVersion: 1.1.8-7.el6-394e9062 Nodes configured, 2 expected votes5 Resources configured.Node jie3.com: standbyOnline: [ jie2.com ] Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ jie2.com ] #资源已然转到jie2.com上面 Stopped: [ mysqldrbd:1 ] mystore (ocf::heartbeat:Filesystem): Started jie2.com myvip (ocf::heartbeat:IPaddr): Started jie2.com myserver (lsb:mysqld): Started jie2.com
由于定义了drbd的资源约束，Masters运行在那个节点，则此节点不可能成为drbd的辅助节点
[root@jie3 ~]# cat /proc/drbdversion: 8.4.3 (api:1/proto:86-101)GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-05-27 04:30:21 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r----- ns:426 nr:354 dw:741 dr:6528 al:8 bm:9 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0[root@jie3 ~]# drbdadm secondary mydata0: State change failed: (-12) Device is held open by someoneCommand 'drbdsetup secondary 0' terminated with exit code 11
手动的停掉myvip资源还是会启动（因为定义资源是指定了on-fail=restart）
[root@jie2 ~]# ifconfig | grep eth0eth0 Link encap:Ethernet HWaddr 00:0C:29:1F:74:CF inet addr:172.16.22.2 Bcast:172.16.255.255 Mask:255.255.0.0 inet6 addr: fe80::20c:29ff:fe1f:74cf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2165062 errors:0 dropped:0 overruns:0 frame:0 TX packets:4109895 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:167895762 (160.1 MiB) TX bytes:5731508707 (5.3 GiB)eth0:0 Link encap:Ethernet HWaddr 00:0C:29:1F:74:CF inet addr:172.16.22.100 Bcast:172.16.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1[root@jie2 ~]# ifconfig eth0:0 down[root@jie2 ~]# ifconfig | grep eth0eth0 Link encap:Ethernet HWaddr 00:0C:29:1F:74:CF inet addr:172.16.22.2 Bcast:172.16.255.255 Mask:255.255.0.0 inet6 addr: fe80::20c:29ff:fe1f:74cf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2165242 errors:0 dropped:0 overruns:0 frame:0 TX packets:4110094 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:167917669 (160.1 MiB) TX bytes:5731537035 (5.3 GiB)[root@jie2 ~]# crm statusLast updated: Thu Aug 8 18:29:27 2013Last change: Mon Sep 2 01:44:59 2013 via crm_attribute on jie3.comStack: classic openais (with plugin)Current DC: jie3.com - partition with quorumVersion: 1.1.8-7.el6-394e9062 Nodes configured, 2 expected votes5 Resources configured.Node jie3.com: standbyOnline: [ jie2.com ] Master/Slave Set: ms_mysqldrbd [mysqldrbd] Masters: [ jie2.com ] Stopped: [ mysqldrbd:1 ] mystore (ocf::heartbeat:Filesystem): Started jie2.com myvip (ocf::heartbeat:IPaddr): Started jie2.com myserver (lsb:mysqld): Started jie2.comFailed actions: myvip_monitor_20000 (node=jie2.com, call=47, rc=7, status=complete): not running myserver_monitor_20000 (node=jie3.com, call=209, rc=7, status=complete): not running[root@jie2 ~]# ifconfig | grep eth0eth0 Link encap:Ethernet HWaddr 00:0C:29:1F:74:CF inet addr:172.16.22.2 Bcast:172.16.255.255 Mask:255.255.0.0 inet6 addr: fe80::20c:29ff:fe1f:74cf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2165681 errors:0 dropped:0 overruns:0 frame:0 TX packets:4110535 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:168015864 (160.2 MiB) TX bytes:5731617112 (5.3 GiB)eth0:1 Link encap:Ethernet HWaddr 00:0C:29:1F:74:CF inet addr:172.16.22.100 Bcast:172.16.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1[root@jie2 ~]#
自此mysql的高可用已经完成。本博客没对crm命令参数进行解释
本文出自 “技术之路---桀” 博客，请务必保留此出处http://litaotao.blog.51cto.com/6224470/1303307