1、创建两台虚拟机，分别为主机和从机，区别两台虚拟机的IP地址

2、 将​​keepalived​​上传到linux系统当中

3、 cd /usr/local目录

(资料图片仅供参考)

4、 tar -zxvf keepalived-1.2.18.tar.gz

5、 cd keepalived-1.2.18目录

6、 yum install -y​​openssl​​openssl-devel (需要安装一个软件包)

7、 ./configure --prefix=/usr/local/keepalived 编译，将编译文件放到/usr/local/keepalived

8、 make

9、 make install

10、 在/etc/keepalived 创建目录：mkdir /etc/keepalived

11、 cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

​12、 cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

13、 cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

14、 ln -s /usr/local/sbin/keepalived /usr/sbin/

(ln -s /usr/local/keepalived/sbin/keepalived /sbin/)

15、 将​​nginx​​启动脚本和keepalived.conf配置上传到/etc/keepalived

16、 主机：修改keepalived.conf配置文件 vim /etc/keepalived/keepalived.conf

interface 配置成与主机相同的网络 ip a　mcast_src_ip 配置成自己机器的IP　　virtual_ipaddress {undefined　　　　192.168.33.135 # 虚拟ip,也就是解决写死程序的ip怎么能切换的ip,也可扩展，用途广泛。可配置多个。　　}

17、 启动keepalived 启动命令service keepalived start

如果报错：Job for keepalived.service failed because the control process exited with error code. See "systemctl status keepalived.service" and "journalctl -xe" for details.

​18、解决办法：rm /usr/sbin/keepalived

19、ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/

20、再次启动

21、可以设置开机启动：chkconfig keepalived on　　

22、自动重启不了，解决办法

查看脚本是否有运行的权限，如果你是 root 登陆的话(不是的话，切换到 root 用户，对*.sh 赋可执行的权限)

赋予权限命令：chmod 777 *.sh

赋予所有权限：chmod +x *.sh

然后运行就 OK 了，即有权限对文件进行删除等操作。

23、备机安装步骤同上，备机修改配置文件步骤如下

24、备机：修改keepalived.conf配置文件 vim /etc/keepalived/keepalived.conf

state BACKUP 备机名称　　interface 配置成与主机相同的网络 ip a　　mcast_src_ip 配置成自己机器的IP　　priority 90 权重配置　　virtual_ipaddress {undefined　　　　192.168.33.135 # 虚拟ip,也就是解决写死程序的ip怎么能切换的ip,也可扩展，用途广泛。可配置多个。　　}

25、从机启动步骤同上

26、效果展示 访问虚拟IP地址192.168.33.135

27、模拟主机挂掉，高可用工具Keepalived实现自动启动备机，防止宕机

注意：为确保区分主机与备机，在此修改了静态资源HTML的标题

①、挂掉主机

②、虚拟IP地址192.168.33.135继续访问备机

③、 虚拟IP访问效果

④、恢复主机

⑤、虚拟IP地址192.168.33.135继续访问主机

⑥、虚拟IP访问效果

29、keepalived 常用命令

启动Keepalived：service keepalived start

关闭Keepalived：service keepalived stop

30、注意事项

区分主机与备机名称、

区分主机与备机IP地址、

区分主机与备机的权重 主机权重>备机权重