基于Haproxy+Keepalived构建高可用负载均衡集群

用到虚拟机111、112、113、114，111、112上安装Haproxy+keepalived，113、114上安装nginx

1、 首先在113上安装Nginx

[root@localhost ~]# yum -y install gcc gcc-c++ make pcre-devel zlib-devel

[root@localhost ~]# useradd -M -s /sbin/nologin nginx
[root@localhost ~]# rz
z waiting to receive.**B0100000023be50
[root@localhost ~]# tar xf nginx-1.15.9.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/nginx-1.15.9/
[root@localhost nginx-1.15.9]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx && make && make install

[root@localhost nginx-1.15.9]# cd /usr/local/nginx/html/
[root@localhost html]# echo "server 192.168.200.113" > index.html
[root@localhost html]# /usr/local/nginx/sbin/nginx
[root@localhost html]# netstat -anpt |grep nginx
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 7681/nginx: master

安装Nginx2， 同Nginx1搭建方式是一样的。与Nginx1唯一不同的是：

[root@localhost html]# echo "server 192.168.200.114" > index.html
2、在111、112上安装Haproxy， 两台机器配置一致：

[root@localhost ~]#  yum -y install gcc gcc-c++ make pcre-devel bzip2-devel

[root@localhost ~]# rz
z waiting to receive.**B0100000023be50
[root@localhost ~]# tar xf haproxy-1.4.24.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/haproxy-1.4.24/
[root@localhost haproxy-1.4.24]# make TARGET=linux26 && make install

Haproxy服务器配置
建立haproxy的配置目录及文件

[root@localhost haproxy-1.4.24]# mkdir /etc/haproxy
[root@localhost haproxy-1.4.24]# cp examples/haproxy.cfg /etc/haproxy/

 haproxy的配置文件的修改

[root@localhost haproxy-1.4.24]# vim /etc/haproxy/haproxy.cfg

# 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 99

    gid 99

    daemon

    #debug

    #quiet

 

defaults

    log global

    mode    http

    option  httplog

    option  dontlognull

    retries 3

    #redispatch

    maxconn 2000

    contimeout  5000

    clitimeout  50000

    srvtimeout  50000

 

listen  web-cluster 0.0.0.0:80

    option httpchk GET /index.html

    balance roundrobin

    server  inst1 192.168.200.113:80 check inter 2000 fall 3

    server  inst2 192.168.200.114:80 check inter 2000 fall 3

创建自启动脚本

[root@localhost haproxy-1.4.24]# cp /usr/src/haproxy-1.4.24/examples/haproxy.init /etc/init.d/haproxy
[root@localhost haproxy-1.4.24]# ln -s /usr/local/sbin/haproxy /usr/sbin/haproxy
[root@localhost haproxy-1.4.24]# chmod +x /etc/init.d/haproxy
[root@localhost haproxy-1.4.24]# /etc/init.d/haproxy start
Starting haproxy (via systemctl): [ 确定 ]

客户端访问测试：

 

 

3、编译安装keepalived服务

[root@localhost haproxy-1.4.24]# cd
[root@localhost ~]# yum -y install keepalived

配置keepalibed 主配置文件

[root@localhost ~]# vim /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

 

vrrp_script chk_http_port {

script "/etc/keepalived/check_haproxy.sh"

interval 2

 

global_defs {

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

 

track_script {

chk_http_port

}

 

virtual_ipaddress {

192.168.200.254

}

}

}

 4、两台机器上都配置haproxy检测脚本

[root@localhost ~]# vim /etc/keepalived/check_haproxy.sh

#!/bin/bash

num=`ps -C haproxy --no-header |wc -l`

if [ $num -eq 0 ]

then

    /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg

    sleep 3

    if [ `ps -C haproxy --no-header |wc -l` -eq 0 ]

    then

        /etc/init.d/keepalived stop

    fi

fi

[root@localhost ~]# chmod +x /etc/keepalived/check_haproxy.sh
[root@localhost ~]# service keepalived start

测试VIP地址

[root@localhost ~]# ip a

[root@localhost ~]# /etc/init.d/keepalived stop                          //停止 keepalived

测试Haproxy健康检查

[root@localhost ~]# service haproxy stop

[root@localhost ~]# service haproxy status

去网页进行测试：