HAproxy+Keepalived负载均衡-高可用web站详细流程介绍

下文给大家带来HAproxy+Keepalived负载均衡-高可用web站详细流程介绍，希望能够给大家在实际运用中带来一定的帮助，负载均衡涉及的东西比较多，理论也不多，网上有很多书籍，今天我们就用亿速云在行业内累计的经验来做一个解答。

haproxy+keepalived负载均衡高可用web站

1、安装Apache服务192.168.26.212和192.168.26.218：（yum install httpd –y）略启动

启动Apache，分别在两台云服务器上创建WEB页并确保网络能正常访问：

2、安装HAproxy:192.168.26.210和192.168.26.211：

Yum install –y haproxy

编辑配置文件：vim /etc/haproxy/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  main *:5000

#    acl url_static       path_beg       -i /static /p_w_picpaths /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 p_w_picpaths, stylesheets and such

##---------------------------------------------------------------------

#backend static

#    balance     roundrobin

#    server      static 127.0.0.1:4331 check

frontend websrv *:80

   default_backend webservers

backend webservers

     balance  roundrobin

     server node3 192.168.26.212:80 check

     server node4 192.168.26.218:80 check

listen statick

     bind *:1024

     stats enable

     stats uri /haadmin?stats

     stats auth admin:admin

     stats hide-version

     stats admin if TRUE

192.168.26.211上配置文件也一样：因此我们直接SCP过去。

scp -p haproxy.cfg node2:/etc/haproxy/

启动两台服务器上的HAproxy服务。

安装keepalived:192.168.26.210和192.168.26.211

首先192.168.26.210配置：

Yum install –y keepalived

编辑配置文件：vim /etc/keepalived/keepalived.conf

配置文件：

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from jwenshan@163.com

   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_script chk_haproxy {

    script "/etc/keepalived/chk.sh"                      //检查haproxy的脚本

    interval 2                                           //每两秒检查一次

}

vrrp_instance VI_1 {

    state BACKUP                                        //定义为BACKUP节点

    nopreempt                                           //开启不抢占

    interface eth0

    virtual_router_id 51

    priority 100                                        //开启了不抢占，所以此处优先级必须高于另一台

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass jerry

    }

    virtual_ipaddress {

        192.168.27.210                                 //配置VIP

    }

    track_script {

        chk_haproxy                                    //调用检查脚本

    }

    notify_backup "/etc/init.d/haproxy restart"

    notify_fault "/etc/init.d/haproxy stop"

}

创建脚本文件：主要用于检测haproxy状态。

Vim /etc/keepalived/Chk.sh

#!/bin/bash

#

if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then

       /etc/init.d/keepalived stop

Fi

启动Keepalived服务:

service keepalived start

192.168.26.211配置：

Yum install –y keepalived

编辑配置文件：Vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from jwenshan@163.com

   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_script chk_haproxy {

    script "/etc/keepalived/chk.sh"                    

    interval 2                                      

}

vrrp_instance VI_1 {

    state BACKUP                                   

    nopreempt                                     

    interface eth0

    virtual_router_id 51

    priority 99                                 

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass jerry

    }

    virtual_ipaddress {

        192.168.27.210                                

    }

    track_script {

        chk_haproxy                                   

    }

    notify_backup "/etc/init.d/haproxy restart"

    notify_fault "/etc/init.d/haproxy stop"

}

脚本文件：vim /etc/keepalived/chk.sh

#!/bin/bash

#

if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then

       /etc/init.d/keepalived stop

Fi

启动Keepalived服务

Service keepalived start

测试VIP网络是否通畅：ping 192.168.27.210 –t

访问VIP网络：

Http://192.168.27.210

不断刷新浏览器观察显示结果

测试通过VIP访问后台监控页面：

访问成功。

测试高可用：

停掉192.168.26.210上Keepalived 观察结果：

Service keepalived stop

首先VIP网络出现波动：

再次访问VIP成功：

VIP已经转移动192.168.26.211上：

恢复192.168.26.210keepalived观察

：vip没有自动转移回192.168.26.210 这和我们的设置参数有关。

本试验keepalived配置中涉及几个重要参数，nopreempt  state MASTER/ state BACKUP  priority 可以更改其设置观察其变化，适应不同场景中的应用。

看了以上关于HAproxy+Keepalived负载均衡-高可用web站详细流程介绍，如果大家还有什么地方需要了解的可以在亿速云行业资讯里查找自己感兴趣的或者找我们的专业技术工程师解答的，亿速云技术工程师在行业内拥有十几年的经验了。