kubernetes - Openshift “oc apply”是覆盖整个配置还是仅覆盖所包含的参数？

Question

当前，我们正在使用以下命令在Openshift中更新configmap设置(此后，我们将重新启动Pod，以使设置生效):

oc apply -f configmap.yml

我的问题是:

该命令将删除现有的configmap并将其替换为该文件的内容，还是仅从文件中导入设置，而保持其他任何设置不变？

基本上，如果实时配置映射包含设置 mytest: true且新文件不包含参数 mytest，该参数是否保留在Openshift的实时配置映射中，或者由于导入文件中未列出该参数而将其删除？

Answer 1

我已经转载了您的案例，并在使用具有不同configmap设置的新yaml之后，新版本开始了。因此，OpenShift不是合并configmap，而是在替换。

让我们一起走下去...

kind: ConfigMap
apiVersion: v1
metadata:
  name: example-config
data: 
  mytest0: "HELLO"
  mytest1: "STACK"
  mytest2: "COMMUNITY"
  mytest3: "!!!"

oc apply -f configmap_lab.yaml
如我们所见，我们按预期包含了所有内容:

$ oc get configmap/example-config -o yaml
apiVersion: v1
data:
  mytest0: HELLO
  mytest1: STACK
  mytest2: COMMUNITY
  mytest3: '!!!'
kind: ConfigMap
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"mytest0":"HELLO","mytest1":"STACK","mytest2":"COMMUNITY","mytest3":"!!!"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"example-config","namespace":"myproject"}}
  creationTimestamp: 2020-01-09T10:42:11Z
  name: example-config
  namespace: myproject
  resourceVersion: "7987774"
  selfLink: /api/v1/namespaces/myproject/configmaps/example-config
  uid: b148dbef-32cc-11ea-9339-525400d653ae

现在，让我们在此之上部署一个新的Yaml:

kind: ConfigMap
apiVersion: v1
metadata:
  name: example-config
data: 
  mytest0: "THANKS"
  mytest1: "STACK"
  newmytest0: "COMMUNITY"
  newmytest1: "!!!"

在这里，我们要更改值，删除2并添加2个参数。让我们检查一下OC将如何处理:

oc apply -f configmap_lab_new.yaml

$ oc get configmap/example-config -o yaml
apiVersion: v1
data:
  mytest0: THANKS
  mytest1: STACK
  newmytest0: COMMUNITY
  newmytest1: '!!!'
kind: ConfigMap
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"mytest0":"THANKS","mytest1":"STACK","newmytest0":"COMMUNITY","newmytest1":"!!!"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"example-config","namespace":"myproject"}}
  creationTimestamp: 2020-01-09T10:42:11Z
  name: example-config
  namespace: myproject
  resourceVersion: "7988585"
  selfLink: /api/v1/namespaces/myproject/configmaps/example-config
  uid: b148dbef-32cc-11ea-9339-525400d653ae

我们注意到，所有更改都被接受并且处于 Activity 状态。

尽管如果您想以更可控的方式进行操作，则可能需要使用 oc patch。 Doc here。