https://blog.csdn.net/xyang81/article/details/52554398
https://blog.csdn.net/brazier820104/article/details/73195147

准备

• centos7.4
• keepalived-2.0.4
  下载地址 - http://www.keepalived.org/download.html

安装

• 安装依赖

yum -y install openssl openssl-devel libnl* libnfnetlink-devel

• 下载源码

wget http://www.keepalived.org/software/keepalived-2.0.4.tar.gz

• 在/usr/local/src下解压

# 解压
tar -zxvf keepalived-2.0.4.tar.gz
# 进入目录
cd keepalived-2.0.4

# 创建安装目录
mkdir /usr/local/keepalived
# 配置安装目录
./configure --prefix=/usr/local/keepalived/
#编译
make && make install

如果 ./configure时出错，说明没有安装OpenSS依赖，参考文章开头的依赖安装

OpenSSL出错

如果出现configure: error: libnfnetlink headers missing，说明没有安装OpenSS依赖，参考文章开头的依赖安装

• 安装好以后，/usr/local/keepalived/目录下结构：

  
  image.png

image.png image.png

配置

• 开机启动

# 创建/etc/keepalived目录
mkdir /etc/keepalived
# 拷贝文件到目录
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
# 这个从keepalived源码目录复制，安装目录中没有
cp /usr/local/src/keepalived-2.0.4/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/

# 开机启动
chkconfig keepalived on
service keepalived start   #启动服务
service keepalived stop    #停止服务
service keepalived restart #重启服务
service keepalived status  #状态

#查看keepalived进程
ps -ef | grep keepalived

配置文件说明

Keepalived的所有功能是配置keepalived.conf文件来实现的。

1. 修改/usr/local/keepalived/etc/keepalived/keepalived.conf配置文件：

TODO。。。

常见问题

• 日志提示：WARNING - script '/etc/keepalived/check_nginx.sh' is not executable for uid:gid 0:0 - disabling.

原因：keepalived监控脚本没有执行权限
解决：chmod +x /etc/keepalived/check_nginx.sh

• 日志提示：/etc/keepalived/check_nginx.sh exited due to signal 15

  解决：interval 5 #监控脚本的执行时间要大于advert_int（3秒不行就5秒）

    advert_int 1         #心跳检查间隔时间
  

• 如果是配置文件出错，那么在执行监控脚本时会输出错误信息，所以要重定向到空

  解决：/usr/local/openresty/nginx/sbin/nginx &>/dev/null