如何执行init容器？

Question

$ kubectl version

Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.6", GitCommit:"9f8ebd171479bec0ada837d7ee641dec2f8c6dd1", GitTreeState:"clean", BuildDate:"2018-03-21T15:21:50Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.6", GitCommit:"9f8ebd171479bec0ada837d7ee641dec2f8c6dd1", GitTreeState:"clean", BuildDate:"2018-03-21T15:13:31Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

看着Sonarqube helm chart

requirements.yaml

dependencies:
- name: sonarqube
  version: 0.5.0
  repository: https://kubernetes-charts.storage.googleapis.com/

尝试安装最新版本的java插件：

values.yaml

plugins:
   install:
     - "http://central.maven.org/maven2/org/sonarsource/java/sonar-java-plugin/5.3.0.13828/sonar-java-plugin-5.3.0.13828.jar"

但是，我在init容器上收到错误：

$ kubectl logs sonarqube-sonarqube-7b5dfd84cf-sglk5 -c install-plugins

sh: /opt/sonarqube/extensions/plugins/install_plugins.sh: Permission denied

---

$ kubectl describe po sonarqube-sonarqube-7b5dfd84cf-sglk5

Name:           sonarqube-sonarqube-7b5dfd84cf-sglk5
Namespace:      default
Node:           docker-for-desktop/192.168.65.3
Start Time:     Thu, 19 Apr 2018 15:22:04 -0500
Labels:         app=sonarqube
                pod-template-hash=3618984079
                release=sonarqube
Annotations:    <none>
Status:         Pending
IP:             10.1.0.250
Controlled By:  ReplicaSet/sonarqube-sonarqube-7b5dfd84cf
Init Containers:
  install-plugins:
    Container ID:  docker://b090f52b95d36e03b8af86de5a6729cec8590807fe23e27689b01e5506604463
    Image:         joosthofman/wget:1.0
    Image ID:      docker-pullable://joosthofman/wget@sha256:74ef45d9683b66b158a0acaf0b0d22f3c2a6e006c3ca25edbc6cf69b6ace8294
    Port:          <none>
    Command:
      sh
      -c
      /opt/sonarqube/extensions/plugins/install_plugins.sh
    State:          Waiting
      Reason:       CrashLoopBackOff

有没有办法让exec进入init容器？

我的尝试：

$ kubectl exec -it sonarqube-sonarqube-7b5dfd84cf-sglk5 -c install-plugins sh

error: unable to upgrade connection: container not found ("install-plugins")

---

更新

随着@WarrenStrange的建议：

$ kubectl get pods
NAME                                    READY     STATUS    RESTARTS   AGE
sonarqube-postgresql-59975458c6-mtfjj   1/1       Running   0          11m
sonarqube-sonarqube-685bd67b8c-nmj2t    1/1       Running   0          11m

$ kubectl get pods sonarqube-sonarqube-685bd67b8c-nmj2t -o yaml
...
 initContainers:
  - command:
    - sh
    - -c
    - 'mkdir -p /opt/sonarqube/extensions/plugins/ && cp /tmp/scripts/install_plugins.sh
      /opt/sonarqube/extensions/plugins/install_plugins.sh && chmod 0775 /opt/sonarqube/extensions/plugins/install_plugins.sh
      && /opt/sonarqube/extensions/plugins/install_plugins.sh '
    image: joosthofman/wget:1.0
    imagePullPolicy: IfNotPresent
    name: install-plugins
    resources: {}
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /opt/sonarqube/extensions
      name: sonarqube
      subPath: extensions
    - mountPath: /tmp/scripts/
      name: install-plugins
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: default-token-89d9n
      readOnly: true
...

创建从init容器清单中提取的新pod pod。用sleep 6000替换命令并执行命令。这可以让你四处寻找。

Answer 1

问题是容器不存在（请参阅CrashLoopBackOff）。

我使用init容器做的事情之一（假设你有源代码）是在入口点失败睡眠600。至少用于调试。这使您可以执行容器来查看失败的原因。

Answer 2

鉴于这种：

$ kubectl logs sonarqube-sonarqube-7b5dfd84cf-sglk5 -c install-plugins

sh: /opt/sonarqube/extensions/plugins/install_plugins.sh: Permission denied

似乎Permission denied是在install-plugin容器内发生的实际错误。您可以通过在本地joosthofman/wget:1.0旋转来诊断docker run -it --rm joosthofman/wget:1.0 sh。这将为您提供容器中的shell，以便您可以查看其运行时内容。

我自己做了，一方面，它试图执行的脚本甚至不存在于容器中。

/ # ls -l /opt/sonarqube/extensions/plugins/install_plugins.sh
ls: /opt/sonarqube/extensions/plugins/install_plugins.sh: No such file or directory