How to limit system resource usage for processes using cgroups in Linux?

Management of CPU, memory, and disk I/O resources in Linux is implemented through the cgroups (control groups) mechanism, which allows isolating and limiting the consumption of system resources by individual processes or groups of applications. This is indispensable on high-load servers where you need to guarantee that background tasks will not exhaust all RAM and crash critical services.

Modern Linux distributions use the second version of the cgroups interface, which is integrated with the systemd service manager, allowing you to manage resources directly from service configuration files. For example, for any systemd service, you can set strict limits on the maximum amount of used memory or CPU time allocation using special configuration directives.

For manual management of process groups without creating system services, you can use the systemd-run utility, which allows running an arbitrary command with specified resource limits "on the fly." This is convenient for testing resource-intensive scripts, such as compiling heavy code or processing large data arrays that could temporarily paralyze the system.

Monitoring the effectiveness of established limits is performed using standard system monitoring utilities, as well as specialized cgroups analysis tools that show the current resource consumption of each group. This approach ensures predictable operating system behavior even under conditions of severe hardware resource shortages or emergency situations.