Centos7+Haproxy实现Apache负载均衡
说到Linux下的负载均衡,其实有很多服务是可以实现的,比如:haproxy,lvs,nginx,这些服务都可以做负载均衡,而我们今天主要介绍的是Haproxy实现Apache的负载均衡。一般做法是通过Haproxy+Keeplive实现高可用负载均衡的,我们将会在后面的文章介绍。
目的:访问Haproxy自动轮询分配后台服务器
环境介绍:
Hostname:A-S
IP:192.168.5.21
Role:Apache
Hostname:B-S
IP:192.168.5.22
Role:Apache
Hostname:C-S
IP:192.168.5.23
Role:Haproxy
我们先看看安装完默认的Haproxy的配置介绍:
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vim /etc/haproxy/haproxy .cfg
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#--------------------------------------------------------------------- # Example configuration for a possible web application. See the # full configuration options online. # # http://haproxy.1wt.eu/download/1.4/doc/configuration.txt # #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global # to have these messages end up in /var/log/haproxy.log you will # need to: # # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/syslog # # local2.* /var/log/haproxy.log # log 127.0.0.1 local2 #日志输出配置,所有日志都记录在本机,通过local2输出
chroot /var/lib/haproxy #改变当前工作目录。
pidfile /var/run/haproxy .pid #所属运行的gid
maxconn 4000 #最大连接数
user haproxy group haproxy daemon #以后台形式运行haproxy
# turn on stats unix socket stats socket /var/lib/haproxy/stats
#--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode http #默认的模式mode { tcp|http|health },tcp是4层,http是7层,health只会返回OK
log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0 /8
option redispatch #当serverId对应的服务器挂掉后,强制定向到其他健康的服务器
retries 3 #两次连接失败就认为是服务器不可用
timeout http-request 10s timeout queue 1m timeout connect 10s #连接超时
timeout client 1m #客户端超时
timeout server 1m #服务器超时
timeout http-keep-alive 10s timeout check 10s #心跳检测超时
maxconn 3000 #默认的最大连接数
#--------------------------------------------------------------------- # main frontend which proxys to the backends #--------------------------------------------------------------------- frontend main *:5000 #haproxy服务器监听端口
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js use_backend static if url_static
default_backend app #--------------------------------------------------------------------- # static backend for serving up images, stylesheets and such #--------------------------------------------------------------------- backend static balance roundrobin #banlance roundrobin 轮询,balance source 保存session值,支持static-rr,leastconn,first,uri等参数 server static 127.0.0.1:4331 check #--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend app balance roundrobin server app1 127.0.0.1:5001 check server app2 127.0.0.1:5002 check server app3 127.0.0.1:5003 check server app4 127.0.0.1:5004 check |
接下来我们开始正式环境配置介绍:首先是安装Apache服务,然后配置显示页面:
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Yum install httpd
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安装完成
查看httpd 版本
接下来我们首先要为apache定义一个 默认的页面,方便区分
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Vim /var/www/httml/index .html
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< /html >
<!DOCTYPE html> <html> < head >
<title>Welcome to Apache< /title >
<style> body { 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } < /style >
<style type = "text/css" >
h1{color:red} h2{color:blue} h3{color:green} h4{color:yellow} } < /style >
< /head ><body bgcolor= '#46A3FF' >
<h1>Welcome to A-S Apache< /h1 >
<h2>HostName:A-S< /h2 >
<h3>IP:192.168.5.21< /h3 >
<h4>Service:Apache< /h4 >
<input type =button value= "Refresh" οnclick= "window.location.href('http://192.168.5.21')" >
< /body >
< /html >
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启动服务
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Systemctl start httpd |
然后添加默认的防火墙端口8o
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Firewall-cmd --zone=public --add-port= '80/tcp' --permanent
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或者vim /etc/firewalld/zone/public.xml
添加一下格式
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<port portocal= 'tcp' port= '80' >
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接下来我们在本地访问测试一下
接下来我们也同样按照方法部署第二台apache服务,方法跟上面完全一样
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< /html >
<!DOCTYPE html> <html> < head >
<title>Welcome to Apache< /title >
<style> body { 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } < /style >
<style type = "text/css" >
h1{color:red} h2{color:blue} h3{color:green} h4{color:yellow} } < /style >
< /head ><body bgcolor= '#CA8EFF' >
<h1>Welcome to B-S Apache< /h1 >
<h2>HostName:B-S< /h2 >
<h3>IP:192.168.5.22< /h3 >
<h4>Service:Apache< /h4 >
<input type =button value= "Refresh" οnclick= "window.location.href('http://192.168.5.22')" >
< /body >
< /html >
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测试访问
最后我们开始部署haproxy了
我们使用192.168.5.33来部署haproxy了
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yum install -y haproxy
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我们可以编辑haproxy的默认配置文件
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vim /etc/haproxy/haproxy .nfg
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#--------------------------------------------------------------------- # Example configuration for a possible web application. See the # full configuration options online. # # http://haproxy.1wt.eu/download/1.4/doc/configuration.txt # #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global # to have these messages end up in /var/log/haproxy.log you will # need to: # # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/syslog # # local2.* /var/log/haproxy.log # log 127.0.0.1 local2 chroot /var/lib/haproxy
pidfile /var/run/haproxy .pid
maxconn 4000 user haproxy group haproxy daemon # turn on stats unix socket stats socket /var/lib/haproxy/stats
#--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0 /8
option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 3000 #--------------------------------------------------------------------- # main frontend which proxys to the backends #--------------------------------------------------------------------- frontend main *:5000 acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js use_backend static if url_static
default_backend app #--------------------------------------------------------------------- # static backend for serving up images, stylesheets and such #--------------------------------------------------------------------- backend static balance roundrobin server static 127.0.0.1:4331 check #--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend app balance roundrobin server app1 127.0.0.1:5001 check server app2 127.0.0.1:5002 check server app3 127.0.0.1:5003 check server app4 127.0.0.1:5004 check |
我们在配置文件的最后面,将默认的端口从4331修改成80
然后添加服务器
更改前
更改后
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#--------------------------------------------------------------------- # Example configuration for a possible web application. See the # full configuration options online. # # http://haproxy.1wt.eu/download/1.4/doc/configuration.txt # #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global # to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy .pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0 /8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#--------------------------------------------------------------------- # main frontend which proxys to the backends #--------------------------------------------------------------------- frontend main *:80 acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js
use_backend static if url_static
default_backend app
#--------------------------------------------------------------------- # static backend for serving up images, stylesheets and such #--------------------------------------------------------------------- backend static balance roundrobin
server static 127.0.0.1:80 check
#--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend app balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
server app5 192.168.5.21:80 check
server app6 192.168.5.22:80 check
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然后启动haproxy服务
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systemctl start haproxy |
然后测试访问haproxy访问
我们通过本地查看端口监听状态
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netstat -anlpt
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我们发现默认的端口是5000
我们使用5000端口在访问一下
接下来我们更改默认端口
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vim /etc/haproxy/haproxy .cfg
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修改为80
修改后我们重启
我们查看端口监听状态
测试访问
本文转自 高文龙 51CTO博客,原文链接:http://blog.51cto.com/gaowenlong/1883159,如需转载请自行联系原作者