haproxy+keepalived
两台负载均衡器都安装
yum -y install haproxyvim /etc/haproxy/haproxy.cfggloballog 127.0.0.1 local2 infopidfile /var/run/haproxy.pidmaxconn 4000 #优先级低user haproxygroup haproxydaemon #以后台形式运行ha-proxynbproc 1 #工作进程数量 cpu内核是几就写几
defaultsmode http #工作模式 http ,tcp 是 4 层,http是 7 层 log globalretries 3 #健康检查。3次连接失败就认为服务器不可用，主要通过后面的check检查option redispatch #服务不可用后重定向到其他健康服务器。maxconn 4000 #优先级中contimeout 5000 #ha服务器与后端服务器连接超时时间，单位毫秒msclitimeout 50000 #客户端超时srvtimeout 50000 #后端服务器超时
listen statsbind *:80 #这个端口要和监听的端口不一致，要不然会端口冲突stats enablestats uri /haproxy #使用浏览器访问 http://192.168.246.169/haproxy,可以看到服务器状态 stats auth qianfeng:123 #用户认证，客户端使用elinks浏览器的时候不生效
frontend webmode http bind *:80 #监听哪个ip和什么端口option httplog #日志类别 http 日志格式acl html url_reg -i \.html$ #1.访问控制列表名称html。规则要求访问以html结尾的urluse_backend httpservers if html #2.如果满足acl html规则，则推送给后端服务器httpserversdefault_backend httpservers #默认使用的服务器组
backend httpservers #名字要与上面的名字必须一样balance roundrobin #负载均衡的方式server http1 后台web服务器ip:端口 maxconn 2000 weight 1 check inter 1s rise 2 fall 2server http2 后台web服务器ip:端口 maxconn 2000 weight 1 check inter 1s rise 2 fall 2systemctl start haproxy //启动haproxy
浏览器分别访问两台负载均衡器
浏览器访问ip:81/haproxy //查看haproxy后台
两台后台rs集群安装web服务器yum -y install nginx
systemctl start nginx
两台负载均衡器都安装
yum install -y keepalived主负载均衡器
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs {router_id director1
}
vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 80priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.188.17/24 #vip}
}备用负载均衡器
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs {router_id directory2
}
vrrp_instance VI_1 {state BACKUPinterface ens33nopreemptvirtual_router_id 80priority 50advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.188.17/24 #vip}
}启动keepalived
systemctl start keepalived对调度器Haproxy健康检查，两台负载均衡器都添加
vim /etc/keepalived/check_haproxy_status.sh
#!/bin/bash /usr/bin/curl -I http://localhost &>/dev/null
if [ $? -ne 0 ];then
# /etc/init.d/keepalived stopsystemctl stop keepalived
fi chmod a+x /etc/keepalived/check_haproxy_status.sh给keepalived配置文件添加
vrrp_script check_haproxy {script "/etc/keepalived/check_haproxy_status.sh" #脚本位置interval 5
}vrrp_instance VI_1 {track_script {check_haproxy}
}注：必须先启动haproxy，再启动keepalived
两台机器都配置haproxy的日志:需要打开注释并添加
vim /etc/rsyslog.conf # Provides UDP syslog reception #由于haproxy的日志是用udp传输的,所以要启用rsyslog的udp监听
$ModLoad imudp
$UDPServerRun 514找到 #### RULES #### 下面添加
local2.* /var/log/haproxy.logsystemctl restart rsyslog
systemctl restart haproxy
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