Java in Containers - Part Deux
summary
Shows that old JVMs misread container limits (CPU and memory) and that recent OpenJDK builds fix ergonomics—OpenJDK 16 sees cgroups v2 and correct CPU visibility. Demonstrates concrete wins: JLink shrinks a JDK from ~316 MB to ~34 MB, a Minecraft container image under 100 MB, CDS cuts simple app startup from ~200 ms to ~145 ms, and GraalVM native-image produces multi-MB executables (8 MB example). Covers rootless containers, Kata, Docker image purging (6 months) and pull limits (100/6h), and warns to use trusted, supported base images.
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chapters (6)
- 0:00Introduction and Java evolution
- 6:28Container awareness in JVM
- 11:51Performance and container startup
- 24:32Java layer latency techniques
- 35:38Security in Java containers
- 43:24Summary and best practices
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