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Get serviceaccount info according to its corresponding token in kubernetes?


Get serviceaccount info according to its corresponding token in kubernetes?

By : user2185791
Date : November 22 2020, 04:01 AM
help you fix your problem The SA secret token is based on JWT you can use for example: https://www.jsonwebtoken.io/ to get a json containing the information of the token as follow:
code :
{
 "iss": "kubernetes/serviceaccount",
 "kubernetes.io/serviceaccount/namespace": "**<your_namespace>**",
 "kubernetes.io/serviceaccount/secret.name": "**<your_sa_name>-token-xxxxx**",
 "kubernetes.io/serviceaccount/service-account.name": "**<your_sa_name>**",
 "kubernetes.io/serviceaccount/service-account.uid": "**<your_sa_uid>**",
 "sub": "system:serviceaccount:<your_namespace>:**<your_sa_name>**",
 "jti": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
 "iat": 9999999999,
 "exp": 9999999999
}


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What's the purpose of Kubernetes ServiceAccount

What's the purpose of Kubernetes ServiceAccount


By : Oleg
Date : March 29 2020, 07:55 AM
hope this fix your issue The service accounts inject authentication credentials into the pod to talk to the Kubernetes service (e.g. the apiserver).
This is important if you are building an application that needs to inspect the pods/services/controllers that are running in the cluster to have correct behavior. For example, the kube2sky container watches services and endpoints to provide DNS within the cluster by connecting to the Kubernetes service.
Why don't I have a default serviceAccount on kubernetes?

Why don't I have a default serviceAccount on kubernetes?


By : Himanshu
Date : March 29 2020, 07:55 AM
like below fixes the issue The default service account for each namespace is created by the service account controller, which is a loop that is part of the kube-controller-manager binary. So, verify that binary is running, and check its logs for anything that suggests it can't create a service account, make sure you set the "--service-account-private-key-file=somefile" to a file that has a valid PEM key.
Alternatively, if you want to make some progress without service accounts, and come back to that later, you can disable the admission controller that is blocking your pods by removing the "ServiceAccount" option from your api-server's --admission-controllers flag. But you will probably want to come back and fix that later.
How to create a Kubernetes ServiceAccount with token?

How to create a Kubernetes ServiceAccount with token?


By : Lovelyn Tijesunimi-I
Date : March 29 2020, 07:55 AM
I hope this helps you . Make sure you start the controller manager with a service account key (used to sign generated service account tokens) and start the API server with the corresponding public key (used to verify the tokens during auth)
Kubernetes dashboard doesn't accept view-only serviceaccount token

Kubernetes dashboard doesn't accept view-only serviceaccount token


By : user2991926
Date : March 29 2020, 07:55 AM
wish helps you Its possible to create service-account in k8s and restrict it to specific namespace.
Follow these steps:
code :
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: mynamespace-user
  namespace: mynamespace

---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: mynamespace-user-full-access
  namespace: mynamespace
rules:
- apiGroups: ["", "extensions", "apps"]
  resources: ["*"]
  verbs: ["*"]
- apiGroups: ["batch"]
  resources:
  - jobs
  - cronjobs
  verbs: ["*"]

---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: mynamespace-user-view
  namespace: mynamespace
subjects:
 - kind: ServiceAccount
  name: mynamespace-user
  namespace: mynamespace
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: mynamespace-user-full-access
kubectl -n mynamespace describe secret $(kubectl -n flow get secret | grep mynamespace-user | awk '{print $1}')
apiVersion: v1
kind: Config
preferences: {}

# Define the cluster
clusters:
- cluster:
    certificate-authority-data: PLACE CERTIFICATE HERE
    # You'll need the API endpoint of your Cluster here:
    server: https://YOUR_KUBERNETES_API_ENDPOINT
  name: my-cluster

# Define the user
users:
- name: mynamespace-user
  user:
    as-user-extra: {}
    client-key-data: PLACE CERTIFICATE HERE
    token: PLACE USER TOKEN HERE

# Define the context: linking a user to a cluster
contexts:
- context:
    cluster: my-cluster
    namespace: mynamespace
    user: mynamespace-user
  name: mynamespace

# Define current context
current-context: mynamespace
kubectl -n mynamespace get secret $(kubectl -n flow get secret | grep mynamespace-user | awk '{print $1}') -o "jsonpath={.data['ca\.crt']}"
Why would /var/run/secrets/kubernetes.io/serviceaccount/token be an empty file in a Pod?

Why would /var/run/secrets/kubernetes.io/serviceaccount/token be an empty file in a Pod?


By : Robert Rupa
Date : March 29 2020, 07:55 AM
hope this fix your issue As mentioned in the docs
code :
apiVersion: v1
kind: ServiceAccount
metadata:
  name: build-robot
automountServiceAccountToken: false
apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  serviceAccountName: build-robot
  automountServiceAccountToken: false
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