Kubernetes: ํฌ๋“œ์— nfs ๋ณผ๋ฅจ ๋งˆ์šดํŠธ๊ฐ€ ์†์ƒ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.

์— ๋งŒ๋“  2016๋…„ 10์›” 27์ผ  ยท  3์ฝ”๋ฉ˜ํŠธ  ยท  ์ถœ์ฒ˜: kubernetes/kubernetes

https://github.com/kubernetes/kubernetes/pull/35652 ํฌ๋“œ์—์„œ nfs ๋ณผ๋ฅจ ๋งˆ์šดํŠธ๋ฅผ ์ค‘๋‹จํ–ˆ์Šต๋‹ˆ๋‹ค.

apiVersion: v1
kind: Pod
metadata:
  name: demo
spec:
  containers:
  - image: fedora:24
    name: fedora
    imagePullPolicy: Always
    command:
    - /usr/bin/sleep
    - "3600"
    volumeMounts:
    - name: myvol
      mountPath: /mnt
  volumes:
  - name: myvol
    nfs:
      path: /srv/share
      server: localhost
  terminationGracePeriodSeconds: 5

kubectl create -f nfspod.yaml

ContainerCreating ๊ฐ‡ํ˜€

kubectl describe pod demo

Events:
  FirstSeen LastSeen    Count   From            SubObjectPath   Type        Reason      Message
  --------- --------    -----   ----            -------------   --------    ------      -------
  14s       14s     1   {default-scheduler }            Normal      Scheduled   Successfully assigned demo to 127.0.0.1
  14s       6s      5   {kubelet 127.0.0.1}         Warning     FailedMount MountVolume.SetUp failed for volume "kubernetes.io/nfs/3cc8bac7-9c77-11e6-ae11-fa163e815edd-myvol" (spec.Name: "myvol") pod "3cc8bac7-9c77-11e6-ae11-fa163e815edd" (UID: "3cc8bac7-9c77-11e6-ae11-fa163e815edd") with: mount failed: exit status 32
Mounting command: mount
Mounting arguments: /localhost:/srv/share /var/lib/kubelet/pods/3cc8bac7-9c77-11e6-ae11-fa163e815edd/volumes/kubernetes.io~nfs/myvol nfs []
Output: mount.nfs: Failed to resolve server /localhost: Name or service not known

nfs ์„œ๋ฒ„ ์ด๋ฆ„์˜ ์„ ํ–‰ / ์— ์œ ์˜ํ•˜์‹ญ์‹œ์˜ค.

@vshh @derekwaynecarr

arekubectl

๊ฐ€์žฅ ์œ ์šฉํ•œ ๋Œ“๊ธ€

์ด๋ด,
NFS ๋งˆ์šดํŠธ๋Š” ์—ฌ์ „ํžˆ GCE์—์„œ ์„œ๋น„์Šค ํ˜ธ์ŠคํŠธ ์ด๋ฆ„(service.namespace)์„ ํ™•์ธํ•  ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค.
์ด ๋ฌธ์ œ๊ฐ€ ์ˆ˜์ • ๋ฐ ๋ณ‘ํ•ฉ๋˜์—ˆ์Šต๋‹ˆ๊นŒ? ์•„๋‹ˆ๋ฉด GCE์—์„œ ํ•ด๊ฒฐ๋˜๋Š” ๋ฐ ์—ฌ์ „ํžˆ ์‹œ๊ฐ„์ด ์ข€ ๊ฑธ๋ฆฌ๋‚˜์š”?

MountVolume.SetUp failed for volume "kubernetes.io/nfs/***" (spec.Name: "***") pod "***" (UID: "***") with: mount failed: exit status 32 Mounting command: mount Mounting arguments: nfs-server:/exports/jenkins-master /var/lib/kubelet/pods/***/volumes/kubernetes.io~nfs/jenkins-master nfs [] Output: mount.nfs: Failed to resolve server nfs-server.storage: Name or service not known

์‹คํ–‰ ์ค‘์ธ ์ปจํ…Œ์ด๋„ˆ๊ฐ€ ์ด๋ฆ„์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์œผ๋ฏ€๋กœ DNS๊ฐ€ ์ œ๋Œ€๋กœ ์ž‘๋™ํ•˜๋Š” ๊ฒƒ ๊ฐ™์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ IP๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ๋„ ์ข‹์ง€๋งŒ ํ•ด๊ฒฐ์ฑ…์€ ์•„๋‹™๋‹ˆ๋‹ค.

๋ชจ๋“  3 ๋Œ“๊ธ€

https://github.com/kubernetes/kubernetes/pull/35349/commits/7fd03c4b6e132347cfa591abb263b92a53d004b1์—์„œ ์ˆ˜์ •ํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค. ๋ฌธ์ œ๋ฅผ ์ผ์œผ์ผœ์„œ ๋ฏธ์•ˆ ํ•ด์š”.

@vishh ์•„ ์˜ˆ, ํ•ด๋‹น ์ˆ˜์ • ์‚ฌํ•ญ์œผ๋กœ PR์„ ์ค€๋น„ํ–ˆ์ง€๋งŒ ๋‹น์‹ ์ด ์ €๋ฅผ ์ด๊ฒผ์Šต๋‹ˆ๋‹ค. ๋งˆ์ด๋„ˆ์Šค ์ „์ฒด else ๊ฒฝ์šฐ๊ฐ€ ์ดํ›„ if ๊ทธ๊ฒƒ์œผ๋กœ ์ข…๋ฃŒ๋˜๊ธฐ ์ „์— return . ๊ฐ์‚ฌ ํ•ด์š”! ํ•ฉ์ณ์ง€๋ฉด ๋‹ซ์„๊ฒŒ

์ด๋ด,
NFS ๋งˆ์šดํŠธ๋Š” ์—ฌ์ „ํžˆ GCE์—์„œ ์„œ๋น„์Šค ํ˜ธ์ŠคํŠธ ์ด๋ฆ„(service.namespace)์„ ํ™•์ธํ•  ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค.
์ด ๋ฌธ์ œ๊ฐ€ ์ˆ˜์ • ๋ฐ ๋ณ‘ํ•ฉ๋˜์—ˆ์Šต๋‹ˆ๊นŒ? ์•„๋‹ˆ๋ฉด GCE์—์„œ ํ•ด๊ฒฐ๋˜๋Š” ๋ฐ ์—ฌ์ „ํžˆ ์‹œ๊ฐ„์ด ์ข€ ๊ฑธ๋ฆฌ๋‚˜์š”?

MountVolume.SetUp failed for volume "kubernetes.io/nfs/***" (spec.Name: "***") pod "***" (UID: "***") with: mount failed: exit status 32 Mounting command: mount Mounting arguments: nfs-server:/exports/jenkins-master /var/lib/kubelet/pods/***/volumes/kubernetes.io~nfs/jenkins-master nfs [] Output: mount.nfs: Failed to resolve server nfs-server.storage: Name or service not known

์‹คํ–‰ ์ค‘์ธ ์ปจํ…Œ์ด๋„ˆ๊ฐ€ ์ด๋ฆ„์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์œผ๋ฏ€๋กœ DNS๊ฐ€ ์ œ๋Œ€๋กœ ์ž‘๋™ํ•˜๋Š” ๊ฒƒ ๊ฐ™์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ IP๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ๋„ ์ข‹์ง€๋งŒ ํ•ด๊ฒฐ์ฑ…์€ ์•„๋‹™๋‹ˆ๋‹ค.

์ด ํŽ˜์ด์ง€๊ฐ€ ๋„์›€์ด ๋˜์—ˆ๋‚˜์š”?
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