Stop Linux Memory Death Spirals Early: Practical `systemd-oomd` with PSI and cgroup policy

The article you've shared provides an excellent guide on how to set up and configure systemd-oomd, a service that helps manage memory pressure in Linux systems. Here's a summary of the key points:

Key Points

1. Enabling systemd-oomd:

   • Ensure your system has systemd-oomd installed.
   • Enable and start the systemd-oomd service.

2. Memory Accounting:

   • Turn on default memory accounting to monitor resource usage accurately.

3. Pressure-Based Policy:

   • Apply pressure-based policy (PSI) to specific slices or services.
   • Example: Set up a drop-in for system.slice with appropriate thresholds and durations.

4. Critical Services Protection:

   • Reserve stricter preferences for critical services like reverse proxies, databases, or SSH bastions.
   • Use the ManagedOOMPreference=omit directive to protect these services from being targeted by systemd-oomd.

5. Testing and Tuning:

   • Test the configuration in a non-critical environment first.
   • Monitor PSI using tools like cat /proc/pressure/memory.
   • Use synthetic

Read the full article at DEV Community

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