如何使用shell在kubeconfig文件中计算k8s中的差异簇数？

Question

文件如下：

- 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: {}

我不想计算有多少不同的星系团。HOw用shell cmd计数吗？

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

没有用

Answer 1

您可以使用kubectl config view命令在-o jsonpath的帮助下列出集群名称：

$  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"命令来美化输出，该命令将用换行符替换空白。

$ 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