Kubernetes：为什么kubeconfig中的’insecure-skip-tls-verify’不起作用？

2023年11月16日 404次阅读

我使用自签名证书运行kube-apiserver：

/opt/bin/kube-apiserver \
--etcd_servers=http://master:2379,http://slave1:2379,http://slave2:2379 \
--logtostderr=false \
--v=4 \
--client-ca-file=/home/kubernetes/ssl/ca.crt \
--service-cluster-ip-range=192.168.3.0/24 \
--tls-cert-file=/home/kubernetes/ssl/server.crt \
--tls-private-key-file=/home/kubernetes/ssl/server.key

然后我用kubeconfig运行kubelet：

/opt/bin/kubelet \
--address=0.0.0.0 \
--port=10250 \
--api_servers=https://master:6443 \
--kubeconfig=/home/kubernetes/ssl/config.yaml \
--logtostderr=false \
--v=4

config.yaml的内容如下：

apiVersion: v1
kind: Config
clusters:
- name: ubuntu
  cluster:
    insecure-skip-tls-verify: true
    server: https://master:6443
contexts:
- context:
    cluster: "ubuntu"
    user: "ubuntu"
  name: development
current-context: development
users:
- name: ubuntu
  user:
    client-certificate: /home/kubernetes/ssl/ca.crt
    client-key: /home/kubernetes/ssl/ca.key

所以,我认为kubelet不会验证apiserver的自签名证书,但日志显示：

E1009 16:48:51.919749  100724 reflector.go:136] Failed to list *api.Pod: Get https://master:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dslave1: x509: certificate signed by unknown authority
E1009 16:48:51.919876  100724 reflector.go:136] Failed to list *api.Node: Get https://master:6443/api/v1/nodes?fieldSelector=metadata.name%3Dslave1: x509: certificate signed by unknown authority
E1009 16:48:51.923153  100724 reflector.go:136] Failed to list *api.Service: Get https://master:6443/api/v1/services: x509: certificate signed by unknown authority
E1009 16:48:52.821556  100724 event.go:194] Unable to write event: 'Post https://master:6443/api/v1/namespaces/default/events: x509: certificate signed by unknown authority' (may retry after sleeping)
E1009 16:48:52.922414  100724 reflector.go:136] Failed to list *api.Node: Get https://master:6443/api/v1/nodes?fieldSelector=metadata.name%3Dslave1: x509: certificate signed by unknown authority
E1009 16:48:52.922433  100724 reflector.go:136] Failed to list *api.Pod: Get https://master:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dslave1: x509: certificate signed by unknown authority
E1009 16:48:52.924432  100724 reflector.go:136] Failed to list *api.Service: Get https://master:6443/api/v1/services: x509: certificate signed by unknown authority

所以我对insecure-skip-tls-verify的含义感到困惑……

最佳答案 当提供客户端证书/密钥时,存在一个打开的问题(
https://github.com/kubernetes/kubernetes/issues/13830),其中包含该标志的行为.提供客户端证书时,将忽略不安全标志.

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