keepalived+nginx安装

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1、安装基础包：

yum -y install libnl libnl-devel

2、上传包：

tar -zxvf keepalived-2.0.20.tar.gz -C /data/imas/base_soft
mkdir -p /data/imas/base_soft/keepalived
cd /data/imas/base_soft/keepalived-2.0.20
./configure --prefix=/data/imas/base_soft/keepalived --sysconf=/etc
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启动 keepalived 时，默认会去 /etc/keepalived 目录下找 keepalived.conf 文件

3、编译安装：

make && make install

cd /etc/keepalived/

4、修改keepalived.conf

主节点配置：
! Configuration File for keepalived

global_defs {
   router_id keep_26
}
vrrp_script check_nginx_alive {
   script "/etc/keepalived/check_nginx_alive_or_not.sh"
   interval 10  #每隔10秒运行上一行的脚本
   weight -10 # 如果脚本运行成功，则权重-10
}
vrrp_instance VI_1 {
    state MASTER
    # 当前实例绑定的网卡
    interface ens160
    # 保证主备节点一致
    virtual_router_id 51
    # 优先级/权重，谁的优先级高，在MASTER挂掉以后，就能成为MASTER
    priority 100
    # 主备之间同步检查的时间间隔，默认1s
    advert_int 1
    # 认证授权的密码，防止非法节点的进入
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        check_nginx_alive # 追踪 nginx脚本
    }
    virtual_ipaddress {
        172.16.11.31
    }
}

备节点配置：

! Configuration File for keepalived

global_defs {
   router_id keep_26
}
vrrp_script check_nginx_alive {
   script "/etc/keepalived/check_nginx_alive_or_not.sh"
   interval 10  #每隔10秒运行上一行的脚本
   weight -10 # 如果脚本运行成功，则权重-10
}
vrrp_instance VI_1 {
    state MASTER
    # 当前实例绑定的网卡
    interface ens160
    # 保证主备节点一致
    virtual_router_id 51
    # 优先级/权重，谁的优先级高，在MASTER挂掉以后，就能成为MASTER
    priority 100
    # 主备之间同步检查的时间间隔，默认1s
    advert_int 1
    # 认证授权的密码，防止非法节点的进入
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        check_nginx_alive # 追踪 nginx脚本
    }
    virtual_ipaddress {
        172.16.11.31
    }
}

5、nginx 检测脚本

cd /etc/keepalived
vi check_nginx_alive_or_not.sh
脚本内容如下：
#!/bin/bash
A=ps -C nginx --no-header |wc -l
#判断nginx是否宕机，如果宕机了，尝试重启
if [ $A -eq 0 ]; then
#/data/imas/base_soft/nginx/sbin/nginx
systemctl start nginx
#等待一小会再次检查nginx，如果没有启动成功，则停止keepalived，使其启动备用机
sleep 3
if [ ps -C nginx --no-header |wc -l -eq 0 ];then
killall keepalived
fi
fi

6、whereis keepalived

keepalived日志文件路径：/var/log/messages

7、配置keepalived开机自启：

systemctl enable keepalived
systemctl daemon-reload
systemctl start keepalived
systemctl status keepalived
systemctl restart keepalived

8、检查虚拟ip访问情况：

访问nginx地址
http://172.16.11.31