Kubernetes OOM Killer: Why Your Container Dies at 50% Memory
Container memory limit is 4GB but OOM kills at 2GB used. Kernel buffers, page cache, and cgroup accounting tricks cause early OOMKills. Here's the full picture.
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4 posts
Redis Memory Fragmentation: When maxmemory Isn't Enough
Your Redis has 4GB maxmemory but RSS shows 6GB. OOM killer strikes. I explain jemalloc fragmentation with reproduction steps and activedefrag tuning.
Java OOMKilled With Stable Heap: Native Memory, Direct Buffers, and glibc Arenas
Heap metrics look fine, GC is happy, but the container keeps dying. The culprit: native memory from direct buffers, JNI, and glibc memory allocator fragmentation.
PostgreSQL OOM by Design: work_mem × Parallel Workers × Plan Nodes
work_mem looks small at 256MB, but a parallel hash join with 4 workers across 3 plan nodes uses 3GB. Here's how to prevent PostgreSQL from legitimately OOMing your container.