Centos 7 安装 Haproxy

【环境】

Centos 7.2

Web1：192.168.136.170

web2：192.168.136.166

Haproxy：192.168.136.173

【web服务器1、2】

安装Nginx（可参考YUM快速搭建LNMP）两台Web服务器都需要安装Nginx

为了方便区分web服务器，我们编辑下首页

web1：

echo 'This is web 1' > /usr/share/nginx/html/index.html

systemctl restart nginx

web2：

echo 'This is web 1' > /usr/share/nginx/html/index.html

systemctl restart nginx

【Haproxy服务器】

yum -y install haproxy

编辑haproxy配置文件

vim /etc/haproxy/haproxy.cfg

（下列红色的#部分，是需要注释的，最下方的是web服务器的地址，如有多个节点，就继续添加）

#---------------------------------------------------------------------
# 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:
    #
    # ) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # ) 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
    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/
#    option                  redispatch
    retries
    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                 

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:
    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: check

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
    balance     roundrobin
    server  app1 127.0.0.1: check
    server  app2 127.0.0.1: check
    server  app3 127.0.0.1: check
    server  app4 127.0.0.1: check
listen webcluster 0.0.0.0:
       option httpchk GET /index.html
       option persist
       balance roundrobin
       server inst1 192.168.136.170 check inter 2000 fall 3
       server inst2 192.168.136.166 check inter 2000 fall 3

然后访问haproxy地址，查看是否会对两台web服务器进行轮询访问。