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本文主要介绍Haproxy负载均衡的安装配置以及结合keepalived保证高可用，概要如下：
-安装haproxy
-配置haporxy
-单台haproxy负载均衡配置
-安装keepalived
-配置keepalived
-haproxy主从配置
-haproxy主从切换测试
-haproxy配置文件详解
安装haproxy
-
环境说明：
-
软件下载目录：/opt/soft
安装目录：/opt/haproxy
日志目录：/data/logs/haproxy/haproxy.log
所属用户：haproxy.haproxy
获取haproxy
Haproxy 官网下载地址：http://www.haproxy/
cd /opt/soft
Wget http://www.haproxy/download/1.5/src/haproxy-1.5.15.tar.gz编译haproxy
编译时指定内核版本target=linux26，你可以# uname –r查看一下本地的系统内核版本。PREFIX=/opt/haproxy是指定haproxy安装路径。
tar -zxvf haproxy-1.5.9.tar.gz
cd haproxy-1.5.9
make TARGET=linux26 PREFIX=/opt/haproxy
make install PREFIX=/opt/haproxy修改配置文件
Haproxy安装完后默认是没有配置文件的，需要手动vi haproxy.cfg编译一个，或者从源码包目录examples/haproxy.cfg拷贝过来。
cd /opt/haproxy
cp /opt/soft/haproxy-1.5.9/examples/haproxy.cfg /opt/haproxy/修改配置文件：
vi haproxy.cfg| 修改前 | 修改后 |
|---|---|
| chroot /usr/share/haproxy | chroot /usr/share/haproxy |
| uid 99 | uid haproxy |
| gid 99 | gid haproxy |
| redispatch | redispatch |
| contimeout 5000 | timeout connect 5000 |
| clitimeout 50000 | timeout client 50000 |
| srvtimeout 50000 | timeout server 50000 |
在daemon下面增加一行：
pidfile /opt/haproxy/haproxy.pid
如图：
可以将文件中的几个listen段删除，并在timeout server 下面增加这一段：
listen admin_stats 0.0.0.0:8888
option httplog
stats refresh 30s
stats uri /stats
stats realm Haproxy Manager
stats auth admin:admin
listen webserver1 0.0.0.0:8090
cookie SERVERID rewrite
balance roundrobin
server app1_1 192.168.253.129:80 cookie app1inst1 check inter 2000 rise
2 fall 5
server app1_2 192.168.253.129:8081 cookie app1inst2 check inter 2000 ri
se 2 fall 5
server app1_3 192.168.253.130:8080 cookie app1inst3 check inter 2000 ri
se 2 fall 5
server app1_4 192.168.253.131:80 cookie app1inst4 check inter 2000 rise
2 fall 5如果不删除的话，则需要将文件71行左右的
srvtimeout 20000 改为 timeout server 20000，
将最后一行（79行左右）
errorfile 503 /etc/haproxy/errors/503.http
改为
errorfile 503 /opt/haproxy/errorfiles/503.http，
并将解压后的源码包目录下的/opt/soft/haproxy-1.5.9/examples/errorfiles拷贝到/opt/haproxy下，即
cp –r /opt/soft/haproxy-1.5.9/examples/errorfiles /opt/haproxy
vi /opt/haproxy/haproxy.cfg最后配置文件如下：
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
#log loghost local0 info
maxconn 4096
#chroot /usr/share/haproxy
uid haproxy
gid haproxy
daemon
pidfile /opt/haproxy/haproxy.pid
#debug
#quiet
defaults
log global
mode http
option httplog
option dontlognull
retries 3
#redispatch
maxconn 2000
timeout connect 5000
timeout client 50000
timeout server 50000
listen appli1-rewrite 0.0.0.0:10001
cookie SERVERID rewrite
balance roundrobin
listen appli2-insert 0.0.0.0:10002
option httpchk
balance roundrobin
cookie SERVERID insert indirect nocache
server inst1 192.168.114.56:80 cookie server01 check inter 2000 fall 3
server inst2 192.168.114.56:81 cookie server02 check inter 2000 fall 3
capture cookie vgnvisitor= len 32
option httpclose # disable keep-alive
listen appli3-relais 0.0.0.0:10003
dispatch 192.168.135.17:80
option persist
server inst2 192.168.114.56:81 check inter 2000 fall 3 backup
listen ssl-relay 0.0.0.0:8443
option ssl-hello-chk
balance source
server inst1 192.168.110.56:443 check inter 2000 fall 3
server inst2 192.168.110.57:443 check inter 2000 fall 3
server back1 192.168.120.58:443 backup
listen appli5-backup 0.0.0.0:10005
option httpchk *
balance roundrobin
cookie SERVERID insert indirect nocache
server inst1 192.168.114.56:80 cookie server01 check inter 2000 fall 3
server inst2 192.168.114.56:81 cookie server02 check inter 2000 fall 3
server inst3 192.168.114.57:80 backup check inter 2000 fall 3
capture cookie ASPSESSION len 32
timeout server 20000
option httpclose # disable keep-alive
option checkcache # block response if set-cookie & cacheab
le
rspidel ^Set-cookie:\ IP= # do not let this cookie tell our intern
al IP address
errorloc 502 本文标签： 负载均衡haproxyKeepalived
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