软件介绍
HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，支持虚拟主机，它是免费、快速并且可靠的一种解决方案，适用于那些负载特大的web站点，这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上，完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整合进您当前的架构中，同时可以保护你的web服务器不被暴露到网络上。
keepalived可提供vrrp以及health-check功能，可以只用它提供双机浮动的vip（vrrp虚拟路由功能），这样可以简单实现一个双机热备高可用功能，类似于layer3, 4 & 5交换机制的软件，也就是我们平时说的第3层、第4层和第5层交换，作 用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当 web服务器工作正常后Keepalived自动将web服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的 web服务器
实验环境
keepalived+Haproxy 192.168.40.144
keepalived+Haproxy 192.168.40.135
vip: 192.168.40.100
web01: 192.168.40.144:80
web02: 192.168.40.135:80
操作
1.安装Keepalived
[root@server01 ~]# cd /usr/local/src/;wget
[root@server01 src]# tar zxvf keepalived-1.2.15.tar.gz
[root@server01 keepalived-1.2.15]# ./configure --prefix=/usr/local/keepalived-1.2.15
.....
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files. !!!
[root@server01 keepalived-1.2.15]# yum -y install openssl-devel
[root@server01 keepalived-1.2.15]# ./configure --prefix=/usr/local/keepalived-1.2.15
....编译安装成功
Keepalived configuration
------------------------
Keepalived version : 1.2.15
Compiler : gcc
Compiler flags : -g -O2
Extra Lib : -lssl -lcrypto -lcrypt
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
IPVS use libnl : No
fwmark socket support : Yes
Use VRRP Framework : Yes
Use VRRP VMAC : Yes
SNMP support : No
SHA1 support : No
Use Debug flags : No
[root@server01 keepalived-1.2.15]# make && make install
[root@server01 ~]# cp /usr/local/keepalived-1.2.15/etc/rc.d/init.d/keepalived /etc/init.d/keepalived
[root@server01 ~]# cp /usr/local/keepalived-1.2.15/sbin/keepalived /usr/sbin/
[root@server01 ~]# cp /usr/local/keepalived-1.2.15/etc/sysconfig/keepalived /etc/sysconfig/
[root@server01 ~]# mkdir -v /etc/keepalived
mkdir: created directory `/etc/keepalived‘
[root@server01 ~]# cp /usr/local/keepalived-1.2.15/etc/keepalived/keepalived.conf /etc/keepalived/
[root@server01 ~]# chmod a+x /etc/init.d/keepalived
[root@server01 ~]# chkconfig --add /etc/init.d/keepalived
[root@server01 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
kaibintest@126.com
}
notification_email_from keepalived@test.com
smtp_server 192.168.40.144
smtp_connect_timeout 30
router_id HAPROXY_MASTER
}
vrrp_script chk_haproxy {
script "/usr/local/keepalived-1.2.15/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_haproxy
}
virtual_ipaddress {
192.168.40.100
}
}2.安装Haproxy
[root@centos-node1 src]wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.24.tar.gz [root@server01 src]# tar zxvf haproxy-1.4.24.tar.gz [root@server01 haproxy-1.4.24]# make TARGET=linux26 ARCH=x84_64 PREFIX=/usr/local/haproxy-1.4.24 [root@server01 haproxy-1.4.24]# make install PREFIX=/usr/local/haproxy-1.4.24 [root@server01 haproxy-1.4.24]# mkdir /etc/haproxy [root@server01 haproxy-1.4.24]# cp examples/haproxy.cfg /etc/haproxy/ [root@server01 haproxy-1.4.24]# cp examples/haproxy.init /etc/init.d/haproxy [root@server01 haproxy-1.4.24]# ln -svf /usr/local/haproxy-1.4.24/sbin/haproxy /usr/sbin/haproxy `/usr/sbin/haproxy‘ -> `/usr/local/haproxy-1.4.24/sbin/haproxy‘ [root@server01 haproxy-1.4.24]# chmod a+x /etc/init.d/haproxy [root@server01 haproxy-1.4.24]# chkconfig --add haproxy [root@server01 haproxy-1.4.24]# chkconfig haproxy on [root@server01 haproxy-1.4.24]# chkconfig --list haproxy haproxy 0:off 1:off 2:on 3:on 4:on 5:on 6:off
http://pynliu.blog.51cto.com/5027391/1619400
http://bbotte.blog.51cto.com/6205307/1606877
http://siriusz.blog.51cto.com/8150455/1368188
本文出自 “Linux革命” 博客，请务必保留此出处http://kaibinyuan.blog.51cto.com/7304008/1621488
原文：http://kaibinyuan.blog.51cto.com/7304008/1621488