haproxy 實戰之haproxy實現httpd負載均衡

haproxy 實戰之haproxy實現httpd負載均衡

實驗目的
haproxy + httpd實現負載均衡

1.準備機器,做好時間同步,域名主機名解析

192.168.42.151 [node2 haproxy]
192.168.42.152 [node3 httpd]
192.168.42.153 [node4 httpd]

2.node3,node4上安裝httpd

node3上操作:
(1)安裝httpd

yum install httpd -y

(2)創建應用目錄

mkdir -p /application/test
chown -R apache.apache /application/test

(3)添加測試頁

echo "this is test1 page." > /application/test/index.html

(4)定義discuz虛擬主機

vim /etc/httpd/conf.d/test.conf

<VirtualHost *:80>
        ServerName www.test.com
        DocumentRoot "/application/test"
        <Directory "/application/test">
                Options None
                AllowOverride None
                Require all granted
        </Directory>
        CustomLog "logs/www.test.com_access_log" combined
</VirtualHost>

(5)添加hosts解析

vim /etc/hosts
192.168.42.152  www.test.com

(6)檢查httpd語法并啟動httpd

httpd -t
systemctl start httpd

(7)測試一把

[root@node3 ~]# curl www.test.com
this is test1 page.

node4 操作同上:
需要改下測試頁的內容,和hosts解析的IP地址
(1)修改測試頁

echo "this is test2 page." > /application/test/index.html

(2)添加hosts解析

vim /etc/hosts
192.168.42.153  www.test.com

(3)測試一把

[root@node4 ~]# curl www.test.com
this is test2 page.

3.安裝haproxy
node1:
(1).haproxy的安裝

yum install haproxy -y

(2).配置haproxy
配置文件如下:

[root@node2 haproxy]# cat haproxy.cfg
#---------------------------------------------------------------------
# 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  web
    bind *:80
    default_backend             websrvs

backend websrvs
    balance     roundrobin
    server      web1 192.168.42.152:80 check
    server      web2 192.168.42.153:80 check

(3)啟動haproxy

systemctl start haproxy
[root@node2 haproxy]# ss -tnl
State      Recv-Q Send-Q      Local Address:Port     Peer Address:Port              
LISTEN     0      3000                    *:80                  *:*                  
LISTEN     0      128                     *:22                  *:*                  
LISTEN     0      100             127.0.0.1:25                  *:*                  
LISTEN     0      128                    :::22                 :::*                  
LISTEN     0      100                   ::1:25                 :::*

(4)添加域名解析

vim /etc/hosts
192.168.42.151 www.test.com

(5).測試一把

[root@node2 haproxy]# for i in {1..10};do curl www.test.com ; done;
this is test1 page.
this is test2 page.
this is test1 page.
this is test2 page.
this is test1 page.
this is test2 page.
this is test1 page.
this is test2 page.
this is test1 page.
this is test2 page.

至此我們就能看到我們訪問的能夠負載均衡了