cgroups

Simple definition

Cgroups limit and measure the resources consumed by Linux processes.

Technical definition

Controlgroups structure CPU, memory, I/O and other controllers and are widely used by systemd and containers.

What’s the point?.

isolating the consumption of resources between services or containers.

Concrete example

a systemd service receives a memory limit.

Common problems

• OOM triggered.
• limit too low.
• difference cgroup v1/v2.

To be noted: Always adapt the diagnosis to the version of the product and to the architecture actually deployed.