Haproxy+Keepalived构建高可用负载均衡集群

Posted 2020-11-15 canflyfish

主机名	IP地址
VIP	192.168.200.254
Haproxy-1	192.168.200.101
Haproxy-2	192.168.200.102
nginx1	192.168.200.103
Nginx2	192.168.200.104

 

 

1、在Nginx1/2上编译安装nginx服务
1.1 首先安装Nginx1

[root@Nginx-1 ~]# yum -y install gcc gcc-c++ make pcre-devel zlib-devel [root@Nginx-1 ~]# useradd -M -s /sbin/nologin  nginx [root@Nginx-1 ~]# tar xf nginx-1.6.2.tar.gz -C /usr/src [root@Nginx-1 ~]# cd /usr/src/nginx-1.6.2 [root@Nginx-1 nginx-1.6.2]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx && make && make install [root@Nginx-1 nginx-1.6.2]# cd /usr/local/nginx/html/ [root@Nginx-1 html]# echo "server 192.168.200.103" > index.html [root@Nginx-1 html]# /usr/local/nginx/sbin/nginx [root@Nginx-1 html]# netstat -anpt |grep nginx tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      4503/nginx

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

[root@Nginx-2 html]# echo "server 192.168.200.104" > index.html

 2、安装Haproxy-1与Haproxy-2 两台机器配置一致：

[root@Haproxy-1 ~]# yum -y install gcc gcc-c++ make pcre-devel bzip2-devel [root@Haproxy-1 ~]# tar xf haproxy-1.4.24.tar.gz -C /usr/src/ [root@Haproxy-1 ~]# cd /usr/src/haproxy-1.4.24/ [root@Haproxy-1 haproxy-1.4.24]# make TARGET=linux26 && make install

 2.1 Haproxy服务器配置
建立haproxy的配置目录及文件

[root@Haproxy-1 haproxy-1.4.24]# mkdir /etc/haproxy [root@Haproxy-1 haproxy-1.4.24]# cp examples/haproxy.cfg /etc/haproxy/

 2.2 haproxy配置项的介绍
haproxy的配置文件通常分为三部分: global（全局配置部分） defaults（默认配置部分） listen(应用组件部分)

[root@Haproxy-1 ~]# 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 192.168.200.103:80 check inter 2000 fall 3     server  inst2 192.168.200.104:80 check inter 2000 fall 3

2.3 创建自启动脚本

[root@Haproxy-1 ~]# cp /usr/src/haproxy-1.4.24/examples/haproxy.init /etc/init.d/haproxy [root@Haproxy-1 ~]# ln -s /usr/local/sbin/haproxy /usr/sbin/haproxy [root@Haproxy-1 ~]# chmod +x /etc/init.d/haproxy [root@Haproxy-1 ~]# /etc/init.d/haproxy start Starting haproxy:                                          [确定]

2.4 客户端访问测试：

用浏览器打开 http://192.168.200.101 打开一个新的浏览器再次访问 http://192.168.200.101

用浏览器打开 http://192.168.200.102 打开一个新的浏览器再次访问 http://192.168.200.102

可以验证两次访问到的结果分别为：

server 192.168.200.103

server 192.168.200.104

 

3、编译安装keepalived服务

[root@Haproxy-1 ~]# yum -y install kernel-devel openssl-devel popt-devel [root@Haproxy-1 ~]# tar xf keepalived-1.2.13.tar.gz [root@Haproxy-1 ~]# cd keepalived-1.2.13 [root@Haproxy-1 keepalived-1.2.13]# ./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.18-194.el5-i686 && make && make install

 3.1 配置keepalibed 开机启动脚本

[root@Haproxy-1 ~]# chkconfig --add keepalived [root@Haproxy-1 ~]# chkconfig keepalived on [root@Haproxy-1 ~]# chkconfig --list keepalived

 3.2.1 配置keepalibed 主配置文件

 

[root@Haproxy-1 ~]# 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 } } }

 3.2.2 第二台Haproxy配置keepalibed 主配置文件

[root@Haproxy-2 ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived   vrrp_script chk_http_port { script "/etc/keepalived/check_haproxy.sh" interval 2 weight 2   global_defs { router_id LVS_DEVEL } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 50 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@Haproxy-1 ~]# cat /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@Haproxy-1 ~]# chmod +x /etc/keepalived/check_haproxy.sh [root@Haproxy-1 ~]# service keepalived start [root@Haproxy-2 ~]# service keepalived start

 5.1、测试VIP地址

[root@Haproxy-1 ~]# ip addr show dev eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000     link/ether 00:0c:29:cc:18:a2 brd ff:ff:ff:ff:ff:ff     inet 192.168.200.101/24 brd 192.168.200.255 scope global eth0     inet 192.168.200.254/32 scope global eth0     inet6 fe80::20c:29ff:fecc:18a2/64 scope link        valid_lft forever preferred_lft forever   [root@Haproxy-1 ~]# /etc/init.d/keepalived stop 停止 keepalived：                                          [确定]   [root@Haproxy-2 ~]# ip addr show dev eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000     link/ether 00:0c:29:fd:8a:4e brd ff:ff:ff:ff:ff:ff     inet 192.168.200.102/24 brd 192.168.200.255 scope global eth0     inet 192.168.200.254/32 scope global eth0     inet6 fe80::20c:29ff:fefd:8a4e/64 scope link        valid_lft forever preferred_lft forever

 5.2、测试Haproxy健康检查

[root@Haproxy-1 ~]# service haproxy stop Shutting down haproxy:                                     [确定] [root@Haproxy-1 ~]# service haproxy status haproxy (pid 59717) 正在运行...

 5.3 网页测试：
用浏览器打开 http://192.168.200.254
再次打开一个新的浏览器再次访问 http://192.168.200.254

可以验证两次访问到的结果分别为：
server 192.168.200.103
server 192.168.200.104