如何使用 shell 计算 kubeconfig 文件中 k8s 中的 diff 集群数？

Question

文件是这样的：

- name: development
  cluster:
    certificate-authority: /etc/kubernetes/pki/ca.crt
    server: https://controlplane:6443

- name: kubernetes-on-aws
  cluster:
    certificate-authority: /etc/kubernetes/pki/ca.crt
    server: https://controlplane:6443

- name: test-cluster-1
  cluster:
    certificate-authority: /etc/kubernetes/pki/ca.crt
    server: https://controlplane:6443

contexts:
- name: test-user@development
  context:
    cluster: development
    user: test-user

- name: aws-user@kubernetes-on-aws
  context:
    cluster: kubernetes-on-aws
    user: aws-user

- name: test-user@production
  context:
    cluster: production
    user: test-user

- name: research
  context:
    cluster: test-cluster-1
    user: dev-user

users:
- name: test-user
  user:
    client-certificate: /etc/kubernetes/pki/users/test-user/test-user.crt
    client-key: /etc/kubernetes/pki/users/test-user/test-user.key
- name: dev-user
  user:
    client-certificate: /etc/kubernetes/pki/users/dev-user/developer-user.crt
    client-key: /etc/kubernetes/pki/users/dev-user/dev-user.key
- name: aws-user
  user:
    client-certificate: /etc/kubernetes/pki/users/aws-user/aws-user.crt
    client-key: /etc/kubernetes/pki/users/aws-user/aws-user.key

current-context: test-user@development
preferences: {}

我不想数有多少差异集群。如何用 shell cmd 来计算它？

cat config.txt > grep 'cluster' wc -l

不工作

Answer 1

您可以在 -o jsonpath 的帮助下使用 kubectl config view 命令列出集群名称：

$  kubectl config view -o jsonpath='{.clusters[*].name}'
cluster-1 cluster-2 cluster-3

数一数：

$ kubectl config view -o jsonpath='{.clusters[*].name}' | wc -w
3

您还可以使用 tr " " "\n" 命令美化您的输出，该命令将用换行符替换白色 space。

$ kubectl config view -o jsonpath='{.clusters[*].name}' | tr " " "\n"
cluster-1
cluster-2
cluster-3

Answer 2

这个很简单

kubectl config get-contexts | grep -v NAME | wc -l

如何使用 shell 计算 kubeconfig 文件中 k8s 中的 diff 集群数？

how to count num of diff clusters in k8s in kubeconfig file using shell?

kubernetes

config