Container Basics On Linux (Namespaces/Cgroups)
Stop flying blind when testing container limits
🧩 The Challenge
You ever wonder if your cgroup memory limits are actually biting the container or if the application is just leaking like a sieve? I’ve spent way too many afternoons staring at pod logs when the real answer was hiding in the kernel’s accounting files.
đź’ˇ The Fix
Instead of guessing or installing heavy monitoring agents, just peek directly at the memory controller stats for the specific process group. It cuts through the noise and shows you exactly what the kernel sees.
cat /sys/fs/cgroup/memory/system.slice/your-container.service/memory.stat⚙️ Why It Works
These files expose the raw counters for everything from cache usage to swap triggers, which tells you instantly if you’re hitting your hard limit. Most people forget this lives right in the filesystem.
🚀 Pro-Tip: Check the memory.failcnt file in that same directory to see how many times your process actually slammed into the limit wall.
Linux Tips & Tricks | © ngelinux.com | 9/9/2026