【转】java、docker_java 程序运行在docker 无法发邮件-优快云博客

本文探讨Oracle Java SE支持流程及其对Docker/K8S的影响。目标是能否基于其他操作系统构建客户Docker镜像并在Openshift或Canonical Kubernetes上运行，以及是否获Oracle支持。解决方案表明配置可行，Java SE 8u131及JDK 9的JVM能感知Docker CPU限制。

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What Is the Oracle Java SE Support Process and It's Impact on Docker/K8S Openshift or Canonical Kubernetes? (文档 ID 2432386.1)

APPLIES TO:

Java SE JDK and JRE - Version 7 to 9
Information in this document applies to any platform.

GOAL

There is an official Docker image for Oracle Java SE. It is based on Oracle Linux. Is it possible to build and install a customer Docker image based on another OS image such as RedHat or Ubuntu? Can that image be run on Openshift or Canonical Kubernetes? And is any of this supported by Oracle?

SOLUTION

Any of the suggested configurations should work. There is no technological bar. From Oracle's standpoint, the use of Docker is irrelevant for Java SE support or licensing. Oracle has made several enhancements to Java SE to make it work more seamlessly with Docker.

As of Java SE 8u131 and in JDK 9, the JVM is Docker-aware with respect to Docker CPU limits. It recognizes such limits transparently. That means that if:

-XX:ParalllelGCThreads, or -XX:CICompilerCount

are not specified as command line options, the JVM will apply the Docker CPU limit as the number of CPUs the JVM detects on the system. See the Java Platform Groups blog post "Java SE support for Docker CPU and memory limits" for more details.