Web Buzz Forum - Docker, Cgroups, Memory Constraints, and Java: A Cautionary Tale, or Here be Reapers (sometimes)

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Docker, Cgroups, Memory Constraints, and Java: A Cautionary Tale, or Here be Reapers (sometimes)

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Matt Williams

Posts: 466
Nickname: aetherical
Registered: Feb, 2008

Matt Williams is a jack-of-all trades living in Columbus, OH.

Docker, Cgroups, Memory Constraints, and Java: A Cautionary Tale, or Here be Reapers (sometimes)

Posted: Mar 17, 2016 7:08 AM

This post originated from an RSS feed registered with Web Buzz by Matt Williams.
Original Post: Docker, Cgroups, Memory Constraints, and Java: A Cautionary Tale, or Here be Reapers (sometimes) Feed Title: Ramblings Feed URL: http://feeds.feedburner.com/matthewkwilliams Feed Description: Musings of Matt Williams	Latest Web Buzz Posts Latest Web Buzz Posts by Matt Williams Latest Posts From Ramblings

TL;DR: Java and cgroups/Docker memory constraints don’t always behave as you might expect. Always explicitly specify JVM heap sizes. Also be aware that kernel features may not be enabled. And Linux… lies. I’ve recently discovered an interesting “quirk” in potential interactions between Java, cgroups, Docker, and the kernel which can cause some surprising results. Unless …

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