在AWS EC2实例中设置Cron Job [英] Setting Cron Job in AWS EC2 instance

问题描述

我已经在AWS EC2中创建了一个cron作业，但是它不起作用.

I've created a cron job in AWS EC2 but it is not working.

我按照以下步骤创建了cron标签:

I followed below steps to create cron tab:

步骤1:我登录到AWS EC2 Instace

Step 1: I logged in to AWS EC2 Instace

第2步:须藤su

第2步:crontab -e

step 2: crontab -e

第3步:插入模式

第4步:我输入

    # M H DOM M DOW CMND

15 14 * * 3 /services/backup.sh >/tmp/error.log 2>&1

第5步:: wq Cron标签已创建但未运行.

Step 5: :wq Cron tab is created but not running.

请问有人可以帮助我，为什么它不起作用?

Please can you any one help me , why it is not working?

更新:

经过大量研究，我发现我可以为特定的cron文件提供日志，因此在文件中添加了>/tmp/error.log 2>& 1并在其中创建了error.log.

after lots of researching i found that i can give a log to the particular cron file so added >/tmp/error.log 2>&1 in my file and created error.log there.

但是我在那里没有任何cron日志.现在我认为我的cron文件没有运行(显然它没有运行).

but i am not getting any cron log there. now i think my cron file is not running(obviously it is not running).

但是如何查看我是否缺少

but how to see whether i am lacking

当我检查cron服务时，它以名称crond

and when i checked cron service it is running with the name crond

service crond status
crond (pid  28283) is running...

(backup.sh脚本绝对运行正常)

(backup.sh script absolutely running fine)

推荐答案

您能否在cron中尝试backup.sh的完整路径，如下所示；您可以使用pwd命令查找脚本的完整路径.

could you try full path of backup.sh in cron like below; you can use pwd command to find full path of your script.

# M H DOM M DOW CMND
25 12 * * 3 /home/user/script/backup.sh

也许您的cron服务未启动，您可以使用"ps -ef | grep cron | grep -v grep"检查状态

Maybe, your cron service not started, you can check status with "ps -ef | grep cron | grep -v grep"

如果看不到任何东西在运行；

if not see any thing run this;

sudo service cron start

如果运行；更改cron如下:

if run; change cron as below;

15 13 * * 3 root /fullpath/backup.sh >/tmp/error.log 2>&1

然后您检查error.log

then you check error.log

>/tmp/error.log 2>& 1是; 将程序的输出重定向到/tmp/error.log.同时包括标准错误和标准输出

>/tmp/error.log 2>&1 is; redirect the output of your program to /tmp/error.log. Include both the Standard Error and Standard Out

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