03： HAProxy服务器 、 Keepalived热备 、 Keepalived+LVS
LVS/DR不对realserver 主机上的服务做健康性检查
是基于四层负载均衡集群软件（端口）
一、使用Haproxy软件部署网站LB集群
1.1普通LB集群
客户端 192.168.4.250
haproxy服务器 192.168.4.100
网站服务器 192.168.4.101/102
配置 haproxy服务器：192.168.4.100
装包
yumlist| grep-i haproxy
rpm-q haproxy ||yum-yinstall haproxy
修改配置文件
cp/etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
vim/etc/haproxy/haproxy.cfg
....
......
stats uri /admin
listenlbweb0.0.0.0:80
cookieSERVERID rewrite
balance roundrobin
serverwebA 192.168.4.101:80 cookie app101a check inter 2000 rise 2 fall 5
serverwebB 192.168.4.102:80 cookie app102b check inter 2000 rise 2 fall 5
:wq
启动服务#servicehaproxystart ; chkconfig haproxyon
查看端口 #netstat-utnalp| grep :80
客户端250 测试#elinks --dump http://192.168.4.100/test.html
查看web页面显示健康性检查信息 http://192.168.4.100/admin
++++++++++++++++++++++++++++++++++++++++++++++
test.html a.php
]# servicehaproxy stop
]# mv haproxy.cfg haproxy.cfg-1
]# cp haproxy.cfg.bak haproxy.cfg
1.2区分业务的LB集群（七层）
]# vim haproxy.cfg
statsuri/admin
frontendweblb 192.168.4.100:80
aclpathhtml path_end -i .html
aclpathphp path_end -i .php
use_backend htmlgrpif pathhtml
use_backend phpgrpif pathphp
default_backend htmlgrp
backend htmlgrp
balance roundrobin
serverapp101 192.168.4.101:80check
serverapp102 192.168.4.102:80check
backendphpgrp
balance roundrobin
serverapp103192.168.4.103:80check
serverapp104192.168.4.104:80 check
]# servicehaproxystart
++++++++++++++++++++++++++++++++++++++++
250elinks--dumphttp://192.168.4.100/test.html
web101
web102
250elinks--dumphttp://192.168.4.100/a.php
helloweb103
helloweb104
250 elinks--dumphttp://192.168.4.100
++++++++++++++++++++++++++++++++++++++
二、使用keepalived软件部署网站HA集群
[*]能够实现任意单故障节点的高可用集群。
配置网站高可用集群 103和 104
1 在主机上都安装keepalived软件
#yumlist |grep-i keepalived
#rpm-qkeepalived|| yum-yinstall keepalived
2 修改服务的主配置文件/etc/keepalived/keepalived.conf
2.1修改主服务器192.168.4.103
vim /etc/keepalived/keepalived.conf
...
state MASTER
priority 150
33 lb_kind DR
35 #persistence_timeout 50 #50秒内访问同一台
....
:wq
2.2修改备用服务器192.168.4.104
vim /etc/keepalived/keepalived.conf
....
stateBACKUP
priority 100
33 lb_kind DR
35 #persistence_timeout 50 #50秒内访问同一台
....
:wq
++++++++++++++++++++++++++++++
3 启动服务
主服务器
/etc/init.d/keepalivedstart
chkconfig keepalivedon
备用服务器
/etc/init.d/keepalivedstart
chkconfig keepalivedon
4 查看是否获取到vip 地址
#ip addr show |grep 192.168.4.
4测试
250: elinks --dumphttp://vip/teset.php
192.168.4.253
++++++++++++++++++++++++++++++++++++++++++++++++
部署101和102为 HA 高可用集群。
客户端访问集群的vip地址是192.168.4.252
101 n-> p ->1 ->2次回车->w
165fdisk-l /dev/vdd
169blkid /dev/vdd1
170mkfs.ext4/dev/vdd1
171blkid /dev/vdd1
172mkdir/webdir
173mount /dev/vdd1 /webdir
174df -h /webdir/
umount/webdir
设置开机挂载/etc/fstab
# tail -1 /etc/fstab
UUID=3f505f56-b559-4f95-9d99-8f99d9318e3c /webdirext4 defaults 0 0
# mount-a
# mount | grep/webdir
1.2共享存储存储空间:装包、修改配置文件、启动服务
184rpm -qnfs-utils
185rpm -qnfs-utils || yum -yinstallnfs-utils
186rpm -qnfs-utils
]# rpm -q rpcbind || yum -yinstall rpcbind
]# vim/etc/exports
/webdir *(rw)
:wq
]# chmod o+w /webdir/
193/etc/init.d/rpcbind status
194/etc/init.d/rpcbind start
195/etc/init.d/nfs status
196/etc/init.d/nfs start
#chkconfig rpcbindon
#chkconfig nfson
1.3在本机查看共享信息
# whichshowmount
/usr/sbin/showmount
# rpm -qf /usr/sbin/showmount
nfs-utils-1.2.3-64.el6.x86_64
#
# showmount-e localhost
Export list for localhost:
/webdir
#
二、配置应用服务器192.168.4.101/102
2.1挂载nfs共享目录
]# yum -y install nfs-utils
]#showmount-e 192.168.4.105
]# rm -rf/var/www/html/
]# mount-tnfs 192.168.4.105:/webdir /var/www/html/
2.2在105主机上编写网页文件
vim /webdir/test.html
aaaa
cccc
:wq
2.3客户端 250 访问 lb集群能够看到网页内容
elinks--dump http://192.168.4.253/test.html
学习学习了。。。。。
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