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Date: Thu, 20 Jan 2022 11:47:24 +0800 (CST)
From: 段光辉 <badwolf09950@....com>
To: musl@...ts.openwall.com
Subject: Apine container can not get correct host cpu.
Hello:
I'm using alpine docker images in Kubernetes. Kubernetes version: v1.19.5, OS: CentOS 7.4.1708, Linux kernel: 3.10.0 .
command `nproc` in container should be return the host cpu count(8 cores, 0-7), but when deployment in kubernetes set limits cpu equals requests cpu,like :
resources:
limits:
cpu: "1"
memory: 1Gi
requests:
cpu: "1"
memory: 1Gi
then `nproc` command return 1, not the host cpu count.
so, the program like java,python,go when get cpu cores will not be correct by methods sched_getaffinity or cpu_count,JVM (JDK8) may be crashed in container,jdk get min value between host and pod limit, method sched_getaffinity in container start from 1, not 0.
~ # apk info musl
musl-1.2.2-r7 description:
the musl c library (libc) implementation
musl-1.2.2-r7 webpage:
https://musl.libc.org/
musl-1.2.2-r7 installed size:
608 KiB
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