问题
I've created a cron job in AWS EC2 but it is not working.
I followed below steps to create cron tab:
Step 1: I logged in to AWS EC2 Instace
step 2: sudo su
step 2: crontab -e
Step 3: Insert mode
Step 4: I entered
# M H DOM M DOW CMND
15 14 * * 3 /services/backup.sh >/tmp/error.log 2>&1
Step 5: :wq Cron tab is created but not running.
Please can you any one help me , why it is not working?
UPDATE :
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.
but i am not getting any cron log there. now i think my cron file is not running(obviously it is not running).
but how to see whether i am lacking
and when i checked cron service it is running with the name crond
service crond status
crond (pid 28283) is running...
(backup.sh script absolutely running fine)
回答1:
I think your issue might with permission and ownership of your backup.sh file.
Check the ownership of file and then do changes accordingly in your /etc/crontab file :
25 12 * * 3 <owner of the file> /home/user/script/backup.sh
For example if the owner of file backup.sh is root then it should look something like this:
25 12 * * 3 root /home/user/script/backup.sh
Hope this help!
回答2:
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
Maybe, your cron service not started, you can check status with "ps -ef | grep cron | grep -v grep"
if not see any thing run this;
sudo service cron start
if run; change cron as below;
15 13 * * 3 root /fullpath/backup.sh >/tmp/error.log 2>&1
then you check error.log
>/tmp/error.log 2>&1 is; redirect the output of your program to /tmp/error.log. Include both the Standard Error and Standard Out
来源：https://stackoverflow.com/questions/40501599/setting-cron-job-in-aws-ec2-instance