关于k8s ServiceAccounts 及其 Secrets 的重大变化

关于 ServiceAccounts 及其 Secrets 的重大变化

kubernetes v1.24.0 更新之后进行创建 ServiceAccount 不会自动生成 Secret 需要对其手动创建

创建 ServiceAccount

cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: ServiceAccount
metadata:
  name: cby
  namespace: default
EOF

查看 ServiceAccount

root@cby:~# kubectl get serviceaccounts cby
NAME                     SECRETS   AGE
cby                      0         9s

查看 ServiceAccount 详细详细，没有对 Token 进行创建

root@cby:~# kubectl describe serviceaccounts cby
Name:                cby
Namespace:           default
Labels:              <none>
Annotations:         <none>
Image pull secrets:  <none>
Mountable secrets:   <none>
Tokens:              <none>
Events:              <none>
root@cby:~# 

root@cby:~# kubectl get secrets
No resources found in default namespace.
root@cby:~#

创建 Secret 资源并与 ServiceAccount 关联

cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Secret
type: kubernetes.io/service-account-token
metadata:
  name: cby
  annotations:
    kubernetes.io/service-account.name: "cby"
EOF

再次查看 ServiceAccount 已对 Secret 关联

root@cby:~# kubectl describe serviceaccounts cby
Name:                cby
Namespace:           default
Labels:              <none>
Annotations:         <none>
Image pull secrets:  <none>
Mountable secrets:   <none>
Tokens:              cby
Events:              <none>
root@cby:~# 

查看 Secret 详细详细

root@cby:~# kubectl get secrets cby 
NAME   TYPE                                  DATA   AGE
cby    kubernetes.io/service-account-token   3      35s
root@cby:~# 

root@cby:~# kubectl describe secrets cby 
Name:         cby
Namespace:    default
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: cby
              kubernetes.io/service-account.uid: c6629b84-1c08-483d-9a12-c2930ac0a2fe

Type:  kubernetes.io/service-account-token

Data
====

ca.crt:     1363 bytes
namespace:  7 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IjRwMk02VU9leXU3N3lraUN6UVQ4R3I3Smw3eFhYdEVMX1Z2aTFjU2luSVEifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZWZhdWx0Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZWNyZXQubmFtZSI6ImNieSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50Lm5hbWUiOiJjYnkiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiJjNjYyOWI4NC0xYzA4LTQ4M2QtOWExMi1jMjkzMGFjMGEyZmUiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6ZGVmYXVsdDpjYnkifQ.r0nHVPO-QY-1p0fwKx0p0AfkiCGpTZ8vGzE8ioDtih5cAP1ew3ABnrj01EqeIEn8vhz29i0NHtZfh5XtYttqjU6o_b1IGFtkW5uIwlxYX2gtmm9njsL2NM7YM6lM0BDfQXvYrpKUuWLQUR-8i79h-GH9WFydmEwnthdxit7uSMJIZuyZP0X0ebxWUg1GGHsqNPy514zXEyvTZh8vs4fVl5ROJbKzFuSuQ1TntXMDncHSf8DSJ7iHUZ0pD757ysHvFKH9l6IbGrt8GUvxWxjMvnNjclLozKgfLXQEOVei39VrPU5DtsPp9DU8C04Gn4TWFW_WsyEWM14lGsQEGD-2QA
root@cby:~# 

删除 ServiceAccount 随之 Secret 一并自动删除

root@cby:~# kubectl delete serviceaccounts cby 
serviceaccount "cby" deleted
root@cby:~#

root@cby:~# kubectl get serviceaccounts
root@cby:~# kubectl get secret