一：安装前配置： 主机：192.168.220.133 辅机：192.168.220.134 虚拟ip：192.168.220.136

（注：192.168.220.133 对应的是mengyan133主机名，192.168.220.134对应的是mengyan134主机名.这个ip和主机名做了映射，两台服务器做了免密登录操作） 1.1首先安装yum -y install gcc pcre-devel zlib-devel openssl-devel 下载安装包keepalived-1.3.4.tar.gz和nginx-1.9.9.tar.gz 1.2安装nginx 执行tar zxvf nginx-1.9.9.tar.gz -C /usr/local/src/ 进入nginx目录：cd /usr/local/src/nginx-1.9.9 添加www用户，其中-M参数表示不添加用户家目录，-s参数表示指定shell类型 useradd www -M -s /sbin/nologin vi auto/cc/gcc #将这句注释掉 取消Debug编译模式 大概在179行 #CFLAGS="$CFLAGS -g" 执行configure： ./configure --prefix=/usr/local/nginx 然后make： make && make install 将nginx服务加入开机启动服务 echo "/usr/local/nginx/sbin/nginx" >> /etc/rc.local 启动nginx ： 在/usr/local/nginx/sbin下执行./nginx 停止：./nginx -s stop 查看nginx的进程：ps -ef|grep nginx 将nginx写入环境变量，这样在哪个目录下都可以执行nginx命令： vi /etc/profile 在文件最下面添加如下： #NGINX_HOME export NGINX_HOME=/usr/local/nginx export PATH=$PATH:$NGINX_HOME/sbin 保存退出 ，执行source /etc/profile使文件生效 执行 nginx就是启动，执行nginx -s stop就是关闭 nginx -s reload重启 1.3安装keepalived 先删除keepalived rm -f /usr/local/sbin/keepalived rm -f /usr/local/etc/rc.d/init.d/keepalived rm -f /usr/local/etc/sysconfig/keepalived rm -rf /usr/local/etc/keepalived rm -f /usr/local/bin/genhash rm -rf /usr/local/keepalived rm -rf /etc/keepalived rm -f /etc/rc.d/init.d/keepalived rm -f /usr/sbin/keepalived rm -f /etc/sysconfig/keepalived rm -f /etc/systemd/system/multi-user.target.wants/keepalived.service 执行tar -zvxf keepalived-1.3.4.tar.gz -C /usr/local/src/ 进入/usr/local/src/keepalived-1.3.4/ 执行./configure 然后：make && make install 将下面的加入配置 cp /usr/local/src/keepalived-1.3.4/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/ cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/  mkdir /etc/keepalived 配置文件： cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ cp /usr/local/sbin/keepalived /usr/sbin/ 将keepalive服务加入开机启动服务： chkconfig keepalived on 启动keepalived： 在安装目录下：service keepalived start 状态：service keepalived status nginx中配置tomcat： 进入到/usr/local/nginx/conf目录下 vi nginx.conf 在server上面在加一个： upstream tomcatservers { server mengyan133:8080 weight=10; server mengyan134:8080 weight=10; } 然后在server下的location中把欢迎页去掉，加上： location / { # root html; proxy_pass http://tomcatservers; index index.html index.htm; } 重启nginx：nginx -s reload 在页面中查看：   二：将keepalived主副机关联 2.1找到keepalived.conf: vi /etc/keepalived/keepalived.conf 主机： vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.220.136 } 介绍：主节点为MASTER，备份节点为BACKUP virtual_router_id 51## 虚拟路由ID号 priority 100  ##优先级配置（0-254的值）virtual_ipaddress：虚拟ip(vip)，可以指定多个 辅机： vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.220.136 } } 两台keepalived重启，主机输入 ip add show ens33 (注：这里的ens33是网卡，不知道网卡是多少的可以敲击：ip a 查看)：   在去查看辅机的：ip add show ens33 ： 可以看到136现在在主机上。停止主机的keepalived:service keepalived stop 再去查看主机的： 查看辅机的： 自动切换到辅机上。在重启主机的keepalived:service keepalived restart 可以看到主机占的权重大，每次主机启动虚拟ip就会跑到主机上 三：将keepalived和nginx自身关联起来并和主副机的keepalived和nginx关联 3.1keepalived只是保证两台服务器之间通信的，不是来看keepalived挂不挂，只是来看nginx挂没挂。nginx挂了但是keepalived没挂虚拟ip不会飘到另一台服务器。所以需要keepalived和nginx相关联（要挂一起挂，虚拟ip才能飘到另一台服务器上）： 在/etc/keepalived下创建：nginx_check.sh， vi nginx_check.sh:

#!/bin/bash
d=`date --date today +%Y%m%d_%H:%M:%S`
n=`ps -C nginx --no-heading|wc -l`
if [ $n -eq 0 ]; then
    echo "`date "+%Y-%m-%d--%H:%M:%S"` nginx stop" >> /var/log/check_ng.log
    /usr/local/nginx/sbin/nginx
    n2=`ps -C nginx --no-heading|wc -l`
    if [ $n2 -eq "0"  ]; then
        echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
        service keepalived stop
    fi
fi

权限： chmod 777 nginx_check.sh （注：除非遇到特殊情况，不然人为的停止nginx，脚本立刻就能再次启动nginx，从而保证服务器正常运行下去。虚拟ip到底怎么飘到另一台服务器上上面已经做了演示。如果想看关闭nginx直接关闭keepalived从而虚拟ip直接飘到另一台服务器的用这个脚本：）

#!/bin/bash
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
service keepalived stop
fi

然后在keepalived.conf中配置： vrrp_script check_nginx {     script "/etc/keepalived/nginx_check.sh"     interval 2     weight -20 } track_script {         check_nginx     } 这里需要主机从起nginx然后重启keepalived 介绍： vrrp_script check_nginx放到vrrp_instance VI_1上面 script "/etc/keepalived/nginx_check.sh" ##执行脚本位置     interval 2 ##检测时间间隔     weight -20 ## 如果条件成立则权重减20（-20） check_nginx 监控脚本放到virtual_ipaddress上面就行 重启keepalived: service keepalived restart 记住：如果用虚拟ip无法访问并且无法ping通的话，原因是keepalived.conf配置中默认vrrp_strict打开了，需要把它注释掉。重启keepalived即可ping通。详情请见： https://blog.csdn.net/charthyf/article/details/81456872