Centos最小化安装时候貌似crond是不带的，需要自己手动安装。但是Centos不同的版本安装命令不一样，在此记录一下！
代码语言：javascript复制# On CentOS 7 you need to use cronie:
yum install -y cronie
# On CentOS 6 you can install vixie-cron, but the real package is cronie:
yum install -y vixie-cron
# 启用
systemctl enable crond
systemctl restart crond参考：
- http://stackoverflow.com/questions/21802223/how-to-install-crontab-on-centos
