基于NFS和heartbeat v2的MySQL高可用


环境:RHEL6.4 heartbeat软体版本2.1.4,默认情况下,RHEL6只提供heartbeat-V3heartbeatV2RHEL5epel源中

配置HA集群的前提:

至少2个节点;

共享存储(可选);

Stonith设备;

时间同步;

各个节点以主机名通信;

至少配置好一个节点,提供基本的集群配置文件,可以没有资源;

ssh互信;

定义心跳信息传递方式,

140658232.png



ServerA:172.16.1.1

ServerB:172.16.1.2

NFServr:172.16.1.3



1、配置主机名解析:

# vi /etc/hosts

node1.magedu.com 172.16.100.1

node2.magedu.com 172.16.100.2

2、同步时间

# ntpdate 172.16.0.1

3、配置ssh互信

# ssh-keygen -t rsa

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@node2

4、安装软件

# yum -yinstall PyXML net-snmp-libs libnet

# rpm -ivhheartbeat-pils-2.1.4-12.el6.x86_64.rpm

# rpm -ivhheartbeat-stonith-2.1.4-12.el6.x86_64.rpm

# rpm -ivh heartbeat-2.1.4-12.el6.x86_64.rpm

# rpm -ivh heartbeat-gui-2.1.4-12.el6.x86_64.rpm

5、配置文件有:authkeys / ha.cf (默认不存在,需要复制样例文件)在/usr/share/doc/heartbeat-2.1.4/

# cd /usr/share/doc/heartbeat-2.1.4/

# cp authkeys ha.cf /etc/ha.d

7、编辑authkeys文件:

# cd /etc/ha.d

# openssl rand -hex 8 >> authkeys

# vi authkeys

auth 2

2 sha1 RandomNumber

# chmod 600 authkeys


8、编辑ha.cf:

# vi ha.cf

设置组播地址传递心跳信息

mcasteth0 225.0.0.250 694 1 0

auto_failback on;自动恢复;

添加集群节点,如果只有2个节点,需要配置ping node功能;

node node1.magedu.com

node node2.magedu.com

ping 172.16.0.1


启用crm(资源管理器)

crm respawn


scp 配置文件node2

# scpha.cf authkeys node2:/etc/ha.d

hacluster用户设置密码,用以登录hb_gui

passwd hacluster


设置MySQL,下载并解压mysql二进制安装包,

#!/bin/bash


#Mount Windows dir incase copy the software.

mount -t cifs -ousername=thinkpad1,password=aaa //172.16.254.52/source /mnt


# Uncompress mysql totarget dir

tar xf/mnt/mysql/mysql-5.5.33-linux2.6-x86_64.tar.gz -C /usr/local

umount /mnt


# Create a user for mysql

useradd -u 306 -r mysql


# Create MySQL Datadirectory

#mkdir /mydata/data -pv

mkdir /mydata

#chown -R mysql.mysql/mydata/data

chown -R mysql.mysql/mydata


cd /usr/local

ln -svmysql-5.5.33-linux2.6-x86_64 mysql

cd mysql

chown -R root.mysql ./*


#Copy example file toconfiguration file and Modify some parameters.

\cp -fsupport-files/my-large.cnf /etc/my.cnf

sed -i '/^\[mysqld\]$/adatadir = /mydata/data\ninnodb_file_per_table = 1' /etc/my.cnf


#Copy example file incase to Control MySQL.

cpsupport-files/mysql.server /etc/init.d/mysqld


#Add Mysql to Servicelist

chkconfig --add mysqld

chkconfigmysqld off


#Init mysql database

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


#Start mysql

#service mysqld start


# export PATH

cat >/etc/profile.d/mysql.sh << EOF

exportPATH=/usr/local/mysql/bin:$PATH

EOF

source/etc/profile.d/mysql.sh


# export lib files

cat >/etc/ld.so.conf.d/mysql.conf << EOF

/usr/local/mysql/lib

EOF

ldconfig


# export .h files

ln -sv/usr/local/mysql/include /usr/include/mysql


NFS节点配置:

node1node2上安装mysql,注意:在初始化数据库时,先挂载NFS,注意NFSmysqldata目录的权限属主和属组是mysql,但是初始化数据库是以root用户来初始的,要让root具有读写权限;

# mkdir/mysqldata/data -pv

# vi /etc/exports

/mysqldata 172.16.0.0/16(rw,no_root_squash)

#exportfs -arv

# useradd-r -u 306 mysql

# chown-R mysql.mysql /mysqldata

# setfacl-m u:root:rx- /mysqldata/data

在集群节点上事先挂载NFS,对数据库进行初始化:初始化一次即可

# mount-t nfs 172.16.1.3:/mysqldata /mydata

# cd/usr/local/mysql

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

# service mysqld start 测试

然后

# servicemysqld stop



配置高可用资源等

#serviceheartbeat start

hb_gui&

141037480.png


定义资源:

将所有资源添加一个组,或添加几个独立的资源,然后定义资源的约束条件;下面以添加组为例:

141131889.png


定义组内资源,设置集群的VIP

141229127.png


添加myservice,添加一个主资源

141337145.png


设置资源名称myservice,资源代理使用lsbmysqld,也就是/etc/init.d/下的mysqld脚本


141514937.png


添加存储资源:


141610498.png


添加一个顺序约束:(资源启动顺序)

141659122.png


配置完成,测试:

[root@node1 mysql]# mysql -uroot -h172.16.1.100 -p

Enter password:

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

Your MySQL connection id is 1

Server version: 5.5.33-log MySQL Community Server (GPL)


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>


总结:此拓扑中节点故障的转移没有障碍,但是存在NFS的单点故障,如果NFS服务停止,那么整个集群将无法工作。

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