How to notify users of crontab execution results by email

symptom

I set a crontab task on a centos7 host, but when the time comes, I run mail and it prompts No mail, which means cron did not send an email to notify the user of the execution result of the task.

Troubleshooting process

Check crontab log

CentOS logs are managed by systemd, so you can view related logs through systemctl.

journalctl _COMM=crond --since=today

Or use root to view the log /var/log/cron

sudo cat /var/log/cron |grep -v '/usr/local/qcloud/stargate/admin/start.sh'

Finally, we will see a line in the log: Jun 22 00:50:19 localhost CROND[21181]: (lujun9972) MAIL (mailed 102 bytes of output but got status 0x004b#012)

This means that the email failed to be sent.

Check the mail log

Check /var/log/maillog and you will find Jun 22 00:50:19 localhost postfix/sendmail[21403]: fatal: parameter inet_interfaces: no local interface found for ::1

That is to say, mail prompts that it cannot find the corresponding network card for the IPV6 address ::1 on the host.

Workaround

postfix/postdrop[5487]: warning: unable to look up public/pickup: No such file or directory

After searching, I just need to create the missing file myself and then restart the postfix service.

sudo mkfifo /var/spool/postfix/public/pickup
sudo chown postfix:postdrop pickup
systemctl restart postfix.service

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