Kubernetes是否接受JSON格式的输入文件来创建configmap和secret？

Question

Kubernetes是否接受JSON格式的输入文件来创建configmap和secret？

kuberneteskubernetes-podconfigmapkubernetes-secrets

19

我有一个已存在的JSON格式的配置文件，类似下面这样：

{
    "maxThreadCount": 10,
    "trackerConfigs": [{
            "url": "https://example1.com/",
            "username": "username",
            "password": "password",
            "defaultLimit": 1
        },
        {
            "url": "https://example2.com/",
            "username": "username",
            "password": "password",
            "defaultLimit": 1
        }
    ],
    "repoConfigs": [{
        "url": "https://github.com/",
        "username": "username",
        "password": "password",
        "type": "GITHUB"
    }],
    "streamConfigs": [{
        "url": "https://example.com/master.json",
        "type": "JSON"
    }]
}

我知道可以通过--from-file选项使用键/值对属性文件创建configmap和secret。

但是JSON格式的文件呢？Kubernetes是否也接受JSON格式的文件作为输入文件来创建configmap和secret？

$ kubectl create configmap demo-configmap --from-file=example.json

如果我运行这个命令，它会显示 configmap/demo-configmap 已创建。但是我如何在其他 Pod 中引用这个 configmap 的值呢？

- user1684651

4个回答

2

配置映射是键值对的容器。如果您从包含JSON的文件创建ConfigMap，则将使用文件名作为键存储JSON作为值。

要从Pod访问这样的ConfigMap，您必须将其作为卷挂载到Pod中：

如何挂载配置映射

- Fritz Duchardt

1

很不幸，hoque提供的解决方案对我无效。在我的情况下，该应用程序以非常可疑的消息终止：

Could not execute because the application was not found or a compatible .NET SDK is not installed.
Possible reasons for this include:
  * You intended to execute a .NET program:
      The application 'myapp.dll' does not exist.
  * You intended to execute a .NET SDK command:
      It was not possible to find any installed .NET SDKs.
      Install a .NET SDK from:
        https://aka.ms/dotnet-download

我看到appsettings.json已经部署了，但是出了些问题。最终，这个解决方案对我有用（类似，但带有一些额外功能）：

spec:
  containers:
    - name: webapp
      image: <my image>
      volumeMounts:
      - name: appconfig
        # "mountPath: /app" only doesn't work (app crashes)
        mountPath: /app/appsettings.json
        subPath: appsettings.json
  volumes:
    - name: appconfig
      configMap:
        name: my-config-map
        # Required since "mountPath: /app" only doesn't work (app crashes)
        items:
        - key: appsettings.json
          path: appsettings.json

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-config-map
  labels:
    app: swpq-task-02-team5
data:
  appsettings.json: |
    {
     ...
    }

- Willy K.

0

我遇到了这个问题已经有几天了，因为我想从我的本地目录引用一个json配置文件（config.production.json）到pod的特定位置（/var/lib/ghost）中。下面的配置对我起作用。请注意mountPath和subPath键，它们为我解决了问题。下面的片段是一个kind=deployment的pod，为了方便阅读而缩短了---

 spec:
      volumes:
        - name: configmap-volume
          configMap:
            name: configmap
      containers:
        - env:
            - name: url
              value: https://www.example.com
          volumeMounts:
            - name: configmap-volume
              mountPath: /var/lib/ghost/config.production.json
              subPath: config.production.json

- wiqram

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- hoque · Accepted Answer

当您使用--from-file创建configmap/secret时，默认情况下文件名将成为键名，文件内容将成为值。

例如，您创建的configmap将会是这个样子：

apiVersion: v1
data:
  test.json: |
    {
        "maxThreadCount": 10,
        "trackerConfigs": [{
                "url": "https://example1.com/",
                "username": "username",
                "password": "password",
                "defaultLimit": 1
            },
            {
                "url": "https://example2.com/",
                "username": "username",
                "password": "password",
                "defaultLimit": 1
            }
        ],
        "repoConfigs": [{
            "url": "https://github.com/",
            "username": "username",
            "password": "password",
            "type": "GITHUB"
        }],
        "streamConfigs": [{
            "url": "https://example.com/master.json",
            "type": "JSON"
        }]
    }
kind: ConfigMap
metadata:
  creationTimestamp: "2020-05-07T09:03:55Z"
  name: demo-configmap
  namespace: default
  resourceVersion: "5283"
  selfLink: /api/v1/namespaces/default/configmaps/demo-configmap
  uid: ce566b36-c141-426e-be30-eb843ab20db6

你可以将configmap作为卷挂载到pod中，其中键名将是文件名，值将是文件内容，如下所示。

apiVersion: v1
kind: Pod
metadata:
  name: test-pod
spec:
  containers:
    - name: test-container
      image: k8s.gcr.io/busybox
      command: [ "/bin/sh", "-c", "ls /etc/config/" ]
      volumeMounts:
      - name: config-volume
        mountPath: /etc/config
  volumes:
    - name: config-volume
      configMap:
        name: demo-configmap
  restartPolicy: Never

当Pod运行时，命令ls /etc/config/将产生下面的输出：

test.json