CentOS7安装定时任务
CentOS7使用cron和anacron用来定期重复执行指令1.服务安装
1.1 查看是否安装yum-cron
rpm -q yum-cron
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1.2 安装cronie
yum -y install cronie
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1.3 安装yum-cron
yum -y install yum-cron
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1.4 备注
单独安装yum-cron也可以，因为yum会自动检测到yum-cron需要一来到cronie然后自动安装
2.基本操作
2.1 启动
systemctl start crond
systemctl start yum-cron
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2.2 停止
systemctl stop yum-cron
systemctl stop crond
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2.3 查看状态
systemctl status crond.service
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2.4 重新加载
systemctl reload crond.service
2.5 重新启动
systemctl restart crond.service
2.6 卸载
yum -y remove yum-cron
yum -y remove cronie
2.7 设置开机启动
systemctl enable crond.service
2.8 查看是否开机启动
2.8.1 列出所有已经安装的服务及状态
systemctl list-unit-files
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3. 定时任务编辑
3.1 查看当前用户的crontab
crontab -l
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3.2 编辑crontab
crontab -e
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3.3 重新加载
systemctl reload crond.service
3.4 查看执行结果
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3.5 删除crontab
crontab -r
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