HA Cluster基础及heartbeat实现HA
HA Cluster基础及heartbeat实现HA配置环境
node1：192.168.1.121 CentOS6.7
node2：192.168.1.122 CentOS6.7
node3：192.168.1.123 CentOS6.7
vip 192.168.1.80
配置前准备
# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.121 node1
192.168.1.122 node2
192.168.1.123 node3
#ssh-keygen -t rsa -P ''
#ssh-copy-id -i ~/.ssh/id_rsa.pub node1
#ssh-copy-id -i ~/.ssh/id_rsa.pub node2
#ssh-copy-id -i ~/.ssh/id_rsa.pub node3
#rpm -ivh epel-release-latest-6.noarch.rpm
#yum -y ansible
#yum -y install ansible
# cat /etc/ansible/hosts
192.168.1.121
192.168.1.122
192.168.1.123
#ansible ha -m copy -a 'src=/etc/hosts dest=/etc'
#ansible ha -m shell -a 'ntpdate 192.168.1.62'
# ansible ha -m cron -a 'minute="*/3" job="/usr/sbin/ntpdate 192.168.1.62" name="ntpdate"'
# ansible ha -m copy -a 'src=/root/heartbeat2 dest=/root'
node1、node2和node3
#yum -y install net-snmp-libs libnet PyXML perl-Time-Date
# ls heartbeat2/
heartbeat-2.1.4-12.el6.x86_64.rpm #主程序包
heartbeat-debuginfo-2.1.4-12.el6.x86_64.rpm
heartbeat-devel-2.1.4-12.el6.x86_64.rpm
heartbeat-gui-2.1.4-12.el6.x86_64.rpm #提供hb-gui的包，可以先不装
heartbeat-ldirectord-2.1.4-12.el6.x86_64.rpm #后端健康检测的工具
heartbeat-pils-2.1.4-12.el6.x86_64.rpm
heartbeat-stonith-2.1.4-12.el6.x86_64.rpm #提供仲裁设备，节点隔离的包
# cd heartbeat2/
# rpm -ivh heartbeat-2.1.4-12.el6.x86_64.rpm heartbeat-pils-2.1.4-12.el6.x86_64.rpm heartbeat-stonith-2.1.4-12.el6.x86_64.rpm
# cp /usr/share/doc/heartbeat-2.1.4/{ha.cf,haresources,authkeys} /etc/ha.d/
# cd /etc/ha.d/
# chmod 600 authkeys
# openssl rand -base64 4
nuGXcw==
# vim authkeys
修改
#auth 1
#2 sha1 HI!
为
auth 2
2 sha1 nuGXcw==
# vim ha.cf
修改
#logfile /var/log/ha-log
为
logfile /var/log/ha-log
修改
logfacility local0
为
#logfacility local0
修改
#mcast eth0 225.0.0.1 694 1 0
为
mcast eth0 225.23.190.1 694 1 0
在node kathy（212行左右）下添加
node node1 #指明所有的node结束
node node2
node node3
在#ping 10.10.10.254（223行左右）下添加
ping 192.168.1.1 #仲裁设备
修改
#compression bz2 #是否压缩
#compression_threshold 2 #多大的文件才压缩
为
compression bz2
compression_threshold 2
# vim haresources
在末尾添加
node1 192.168.1.80/16/eth0/192.168.255.255 httpd
# scp -p authkeys ha.cf haresources node2:/etc/ha.d
# scp -p authkeys ha.cf haresources node3:/etc/ha.d
# vim /var/www/html/index.html
<h1>node1.magedu.com</h1>
# service httpd stop
Stopping httpd:
# chkconfig httpd off
# vim /var/www/html/index.html
<h1>node2.magedu.com</h1>
# service httpd stop
Stopping httpd:
# chkconfig httpd off
# vim /var/www/html/index.html
<h1>node3.magedu.com</h1>
# service httpd stop
Stopping httpd:
# chkconfig httpd off
# ansible ha -m service -a 'name=heartbeat state=started'
03 HA Cluster概念扩展及heartbeat实现
使自己变成备用结点
# /usr/lib64/heartbeat/hb_standby
使用变回主结点
# /usr/lib64/heartbeat/hb_takeover
# mkdir /web/htdocs -pv
# vim /web/htdocs/index.html
<h1>Page On NFS Server</h1>
# vim /etc/exports
/web/htdocs 192.168.1.0/24(rw,no_root_squash)
# service nfs start
# service heartbeat stop;ssh node2 'service heartbeat stop'
# cd /etc/ha.d/
# vim haresources
在末尾添加
node1 192.168.1.80/16/eth0/192.168.255.255 Filesystem::192.168.1.123::/web/htdocs::/var/www/htm::nfs httpd
# service heartbeat start;ssh node2 'service heartbeat start'
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