keepalived+Nginx实现高可用主从集群

systemctl stop firewalld && systemctl disable firewalld && setenforce 0

`安装依赖`
yum -y install openssl openssl-devel zlib zlib-devel pcre pcre-devel gcc gcc-c++ make cmake
`解压并安装`
tar -zxf nginx-1.6.2.tar.gz
cd nginx-1.6.2 && ./configure && make && make install
`软连接`
ln -s /usr/local/nginx/sbin/nginx  /usr/sbin/

`安装java环境`
yum -y install java-1.8.0-openjdk
`解压并安装`
tar -zxf apache-tomcat-8.5.42.tar.gz
`修改默认页面`
rm -rf /root/apache-tomcat-8.5.42/webapps/ROOT/index.jsp
echo 'web1/2' > /root/apache-tomcat-8.5.42/webapps/ROOT/index.html
`启动`
/root/apache-tomcat-8.5.42/bin/startup.sh

vi /usr/local/nginx/conf/nginx.conf
####配置内容#####

    #gzip  on;
    upstream web {
      server 192.168.1.30:8080 weight=1 max_fails=3 fail_timeout=10s;
      server 192.168.1.40:8080 weight=1 max_fails=3 fail_timeout=10s;
}
    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
          proxy_pass http://web/;
        }

        #error_page  404              /404.html;

`` ``
nginx #启动
nginx -t #文件检查
nginx -s stop  #停止
nginx -s reload #重启

yum install keepalived -y

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {  #keepalived节点出现故障，给管理员发送消息
   notification_email { # 管理员的邮箱
     123@qq.com
   }
   notification_email_from abc@qq.com #邮箱的发件者
   smtp_server 192.168.1.200 #邮箱服务器的ip
   smtp_connect_timeout 30 #邮件服务器连接的超时时间
   router_id LVS_DEVEL #节点的标识符（hostname）
}

vrrp_instance VI_1 { #vrrp协议组的名称
    state MASTER # 节点的状态  主（master）
    interface ens33  #用来发送vrrp的网卡
    virtual_router_id 66 #server_id  一个组的ip必须一致
    priority 100 #当前节点的优先级  1-255
    advert_int 1 #vrrp通告的间隔时间，单位为s
    authentication { #认证主和备之间的通讯
        auth_type PASS #认证类型
        auth_pass 1111 #使用的密钥
    }
    virtual_ipaddress { #vip的地址
        192.168.1.200
    }
}

virtual_server 192.168.1.200 80 { 
    delay_loop 6 #对后端的健康检查间隔的时间
    lb_algo rr  #调度算法rr
    lb_kind DR   #调度模式  DR
    net_mask 255.255.255.0  #netmask
    persistence_timeout 0 #会话保持时间
    protocol TCP #使用传输协议时tcp

    real_server 192.168.1.10 80 { #后端真实节点  ip端口
        weight 1 #节点的权重
        connect_port 80 #连接节点的端口
        connect_timeout 3 #节点连接等待的时间
        nb_get_retry 3 #节点连接的次数
        delay_before_retry 3 #每隔多久和节点建立连接
}
    real_server 192.168.1.20 80 {
        weight 1
        connect_port 80
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
}
}

! Configuration File for keepalived

global_defs {
   notification_email {
     123@qq.com
   }
   notification_email_from abc@qq.com
   smtp_server 192.168.1.200
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 66
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.200
    }
}

virtual_server 192.168.1.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    net_mask 255.255.255.0
    persistence_timeout 0
    protocol TCP

    real_server 192.168.1.10 80 {
        weight 1
        connect_port 80
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
}
    real_server 192.168.1.20 80 {
        weight 1
        connect_port 80
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
}
}

systemctl start keepalived

nginx  -s reload

[root@SLBmaster ~]# systemctl stop keepalived