Kubernetes 作业初始化容器

Question

我创建了一个带有 2 个 INIT 容器的 JOB pod 在创建 pod 时，我的工作成功完成，但没有 init 容器的迹象

对我来说，工作应该在开始之前等待 2 个 init 容器完成

我的工作蓝图（取自 Kubernetes 文档）以防您想重现问题

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
annotations:
  pod.beta.kubernetes.io/init-containers: '[
    {
      "name": "init-myservice",
      "image": "busybox",
      "command": ["sh", "-c", "until nslookup myservice; do echo waiting for myservice; sleep 2; done;"]
    },
    {
      "name": "init-mydb",
      "image": "busybox",
      "command": ["sh", "-c", "until nslookup mydb; do echo waiting for mydb; sleep 2; done;"]
    }
    ]'
spec:
  template:
    metadata:
      name: pi
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never

在检查我的工作 pod 时

$ kubectl describe pod pi-v2dn9
Name: pi-v2dn9
Namespace: default
Security Policy: anyuid
Node: 192.168.111.4/192.168.111.4
Start Time: Thu, 19 Oct 2017 08:58:39 +0000
Labels: controller-uid=b3091c77-b4ab-11e7-a3ea-fa163ea1c70b
job-name=pi
Status: Succeeded
IP: 10.131.0.46
Controllers: Job/pi
Containers:
pi:
Container ID: docker://4bc5bb4c9fc65c1aa1999c3bdc09b01e54043dcdd464410edd0c9cad334c9c67
Image: perl
Image ID: docker-pullable://docker.io/perl@sha256:80bd8136a0f3e2c7d202236fc5d8f1192dbfa9ec661ecdd5e96a446e9c7913a8
Port:
Command:
perl
-Mbignum=bpi
-wle
print bpi(2000)
State: Terminated
Reason: Completed
Exit Code: 0
Started: Thu, 19 Oct 2017 08:58:53 +0000
Finished: Thu, 19 Oct 2017 08:58:58 +0000
Ready: False
Restart Count: 0
Volume Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-fxdf1 (ro)
Environment Variables: 
Conditions:
Type Status
Initialized True
Ready False
PodScheduled True
Volumes:
default-token-fxdf1:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-fxdf1
QoS Class: BestEffort
Tolerations: 
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message

26s 26s 1 {default-scheduler } Normal Scheduled Successfully assigned pi-v2dn9 to 192.168.111.4
25s 25s 1 {kubelet 192.168.111.4} spec.containers{pi} Normal Pulling pulling image "perl"
12s 12s 1 {kubelet 192.168.111.4} spec.containers{pi} Normal Pulled Successfully pulled image "perl"
12s 12s 1 {kubelet 192.168.111.4} spec.containers{pi} Normal Created Created container with docker id 4bc5bb4c9fc6; Security:[seccomp=unconfined]
12s 12s 1 {kubelet 192.168.111.4} spec.containers{pi} Normal Started Started container with docker id 4bc5bb4c9fc6

没有初始化容器的迹象！！！

我的环境： --- Kubernetes 版本（使用 kubectl 版本）： 客户端版本：version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2+43a9be4", GitCommit:"43a9be4", GitTreeState:"clean", BuildDate:"2017-04-20T15: 38:11Z”，GoVersion：“go1.7.4”，编译器：“gc”，平台：“linux/amd64”} 服务器版本：version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2+43a9be4", GitCommit:"43a9be4", GitTreeState:"clean", BuildDate:"2017-04-20T15: 38:11Z”，GoVersion：“go1.7.4”，编译器：“gc”，平台：“linux/amd64”}

我在 OpenStack 的集群中工作

操作系统是 Red Hat Enterprise Linux Server 7.3 (Maipo)

提前感谢您的帮助。

Answer 1

您的注释在错误的位置。特别是对于 init 容器，它们应该在 pod 元数据中定义，而您已将其添加到作业元数据中。

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      name: pi
      annotations:
        pod.beta.kubernetes.io/init-containers: '[
          {
            "name": "init-myservice",
            "image": "busybox",
            "command": ["sh", "-c", "until nslookup myservice; do echo waiting for myservice; sleep 2; done;"]
          },
          {
            "name": "init-mydb",
            "image": "busybox",
            "command": ["sh", "-c", "until nslookup mydb; do echo waiting for mydb; sleep 2; done;"]
          }
        ]'
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never

Answer 2

尝试将注释添加到规范模板而不是 Job 对象：

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      name: pi
    annotations:
      pod.beta.kubernetes.io/init-containers: '[
        {
          "name": "init-myservice",
          "image": "busybox",
          "command": ["sh", "-c", "until nslookup myservice; do echo waiting for myservice; sleep 2; done;"]
        },
        {
          "name": "init-mydb",
          "image": "busybox",
          "command": ["sh", "-c", "until nslookup mydb; do echo waiting for mydb; sleep 2; done;"]
        }
        ]'
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never

Answer 3

作业中的初始化容器在 1.6 版本之前不起作用。您必须升级到 1.6+ 版本才能使用它