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10: Managing Linux Processes and Services
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If you are logged in as a regular user, the atq command will display only the jobs associated with the current user account If you re logged in as root, then atq will display all pending jobs for all users If you need to remove a pending job from the list, you can use the atrm job_number command In addition to the at daemon, you can also use the cron daemon to schedule future jobs Let s discuss how this is done next
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The at daemon is great; however, it has one key drawback It can only schedule a job to run once in the future That s not a problem if you only want the job to run once However, there will be many times that you want a job to run in the future on a regular schedule For example, you may need to run a process, such as a backup utility, every day at a certain time In this situation, the at daemon doesn t cut it We need a tool that can handle repetitious schedules The cron daemon can do just that Unlike at, cron can run commands on a schedule you specify It s a very powerful, very useful service I use at occasionally However, cron is a service that I use all of the time In fact, I would have a hard time getting my work done without it Most of my clients offices are many miles from my office Making rounds just to run backups for all of my clients each day would take up all of my time I don t dare trust my clients administrative personnel to make sure backups occur each day Instead, I set up the cron daemon to run the backup process for me That way, I know that backups are occurring on a regular schedule and that the correct command has been issued to create them In this part of the chapter, we ll discuss the following:
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How cron works Using cron to manage scheduled system jobs Using cron to manage scheduled user jobs
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Let s begin by learning how the cron service works
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The cron daemon is a service that runs continuously in the background on your system and checks a special file called a crontab file once every minute to see if
Schedule Processes
FIGURE 10-29
Viewing the cron init script
there s a scheduled job it should run The cron daemon is managed using the cron init script in your init directory, as shown in Figure 10-29 By default, the cron daemon is configured to run automatically every time the system boots on most Linux distributions If not, you ll need to start it manually using the cron init script in your system s init directory You can configure cron to run system jobs or user-specific jobs Let s talk about running system jobs first
Using cron to Manage Scheduled System Jobs
Using cron to run scheduled system jobs is an extremely useful tool for a Linux system administrator You can configure your systems to perform a wide variety of tasks on a regular schedule automatically, saving you a ton of time and effort Remember when I mentioned the problems with running regular backups Creating a system job in cron that runs a backup on a regular schedule saves me tons of time If I don t have time to
10: Managing Linux Processes and Services
FIGURE 10-30
The /etc/crontab file
visit a client site on a particular day, I don t have to worry I know that cron will run a backup at the preconfigured time All I have to do is drop by now and then to verify that everything is still working properly and to perhaps rotate the backup media I love cron! To run system jobs, the cron service uses the /etc/crontab file, shown in Figure 10-30, to configure what jobs to run As you can see in Figure 10-30, the /etc/crontab file contains commands that are used to run scripts found in four different directories:
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