šŸ§ How to Check Crontab Logs on Linux ā€” IT is good

šŸ§ How to Check Crontab Logs on Linux ā€” IT is good

As a Linux user, you are probably already familiar with crontab.

You can automate tasks by running commands and scripts on a scheduled basis.

Want to automatically create backups?

Crontab will help you with this.

Here, I won’t delve into the use of crontab.

I’ll focus on showing you different ways to check crontab logs.

This will help you find out if your cronjobs ran as scheduled or not.

Method 1: Check syslog for crontab entries

According to the Linux directory hierarchy, the /var/log directory in Linux stores system, service, and running application logs.

Although the cron logs are also located in this directory, there is no standard file for these logs. Different distributions store them in different files.

šŸ§ Beginner’s Guide to System Logs on Linux Systems

On Debian-based distributions, the file /var/log/syslog сcontains cron job execution logs and should be consulted if cron jobs are not running:

cat /var/log/syslog | grep -w 'cron'

After executing the above command, you will see a list of all cron jobs in the terminal.

The grep command will filter cron-related messages from the rest.

For distributions based on RedHat, cron logs are located in a special file /var/log/cron.

In both cases, you will probably need to use the sudo keyword or use the root account to access the logs.

Method 2: Using a custom log file (recommended)

It is recommended to use a separate user file for registering cron jobs.

To do this, you can configure ‘rsyslog’ to forward cron logs.

Rsyslog is a Linux service that has functions similar to Syslog logging.

Just create a cron.log file in the /etc/rsyslog.d directory:

touch /var/log/cron.log

Now open the /etc/rsyslog.d/50-default.conf file for editing:

nano /etc/rsyslog.d/50-default.confĀ 

and find the line starting with #cron.* and remove the # at the beginning of the line.

For the changes to take effect, save and close this file, and finally restart the rsyslog service and check its status:

sudo systemctl restart rsyslog
sudo systemctl status rsyslog

The service status should be highlighted as active (running).

Method 3: Using special services like Cronitor to monitor cron jobs

Cronitor is a service that can be deployed to monitor any type of cron jobs.

Many versions of cron start logging when a scheduled job runs or when there are problems with crontab.

However, the cron job’s exit or exit status is not logged.

This is where Cronitor comes to the rescue and works perfectly.

It is a complete solution for all your crontab needs.

šŸ§ An overview of open source log monitoring and management tools for Linux

It collects logs, metrics and status of all jobs and generates instant alerts when a job fails or fails to run.

All this can be seen through the web interface.

For Cronitor or CronitorCLI installed on Kubernetes, logs can be written up to 100MB per execution.

Other monitoring tools and services, such as Better Uptime, also provide the ability to automatically monitor cron jobs.

šŸ§ How to use journalctl to analyze logs on Linux

Conclusion

System logs are very important for finding and diagnosing system-related problems, and cron logs are no exception.

Syslog keeps logs related to crontab, however it is recommended to have a special log file for cron.

A web service like Cronitor, Better Uptime or Uptime Robot will also help.

see also:

HOWTO,AlmaLinux,Arch Linux,bash,CentOS,cron,Debian,Fedora:,Linux,Linux Mint.,OpenSUSE,RHEL,Scientific Linux,Ubuntu,Unix,

#Check #Crontab #Logs #Linux #good

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