如何在 Kubernetes 中修补 ConfigMap [英] How to patch a ConfigMap in Kubernetes

问题描述

Kubernetes 附带一个名为 coredns 的 ConfigMap，可让您指定 DNS 设置.我想通过添加以下内容来修改或修补此配置的一小部分:

Kubernetes ships with a ConfigMap called coredns that lets you specify DNS settings. I want to modify or patch a small piece of this configuration by adding:

apiVersion: v1
kind: ConfigMap
data:
  upstreamNameservers: |
    ["1.1.1.1", "1.0.0.1"]

我知道我可以使用 kubectrl edit 来编辑 coredns ConfigMap 有什么方法可以让我得到上面只包含设置的文件我想插入或更新并将其合并到现有 ConfigMap 之上或修补它?

I know I can use kubectrl edit to edit the coredns ConfigMap is there some way I can take the above file containing only the settings I want to insert or update and have it merged on top of or patched over the existing ConfigMap?

这样做的原因是我希望我的部署可以使用 CI/CD 重复.因此，即使我在全新的 Kubernetes 集群上运行我的 Helm 图表，也会应用上述设置.

The reason for this is that I want my deployment to be repeatable using CI/CD. So, even if I ran my Helm chart on a brand new Kubernetes cluster, the settings above would be applied.

推荐答案

这将对单个字段应用相同的补丁:

This will apply the same patch to that single field:

kubectl patch configmap/coredns 
  -n kube-system 
  --type merge 
  -p '{"data":{"upstreamNameservers":"["1.1.1.1", "1.0.0.1"]"}}'

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