From the course: Exploring Linux Internals: Advanced Insights and Practical Applications

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Scheduling processes with timers

Scheduling processes with timers - Linux Tutorial

From the course: Exploring Linux Internals: Advanced Insights and Practical Applications

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Scheduling processes with timers

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- In this video, you will learn about systemd timers. So systemd timers are used to run scheduled jobs and they replace cron functionality. That is something that is actually already happening. If you look at cron jobs on a RHEL 9 system, for instance, you won't see any because they have been replaced by timers as a default. Now, a systemd timer runs a command for a specific amount of time, and it can also run a command after occurrence of a specific event. And as I mentioned, currently, distributors are replacing cron with systemd timers. Let's check them out. So first, I would like to investigate cron. We are on which operating system? Well, this is CentOS Stream version 9. And if we will use ls on etc/cron*, then what do we see? We see that the etc/cron.d and cron.daily and cron.hourly, monthly and weekly, they're all empty. Cron jobs are gone. And that's because of the timers. So let's use systemctl list units minus t timer. And here, we can see the timers that are currently…

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