CODEWITHSUNDEEP
kubernetesrediskubernetes-pod
O.Man
O.Man

Reputation: 639

Get access to variables from the redis container

I create secret redis-secret with following command.

kubectl create secret generic redis-secret --from-literal=password=0123456

After that I create pod secrets-via-file, using the redis image, which mounts secret name redis-secret at /secrets.

kubectl run secret-via-file --image=redis --dry-run=client -o yaml > pod.yaml

I edited the create pod.yaml file.

apiVersion: v1
    kind: Pod
metadata:
  labels:
    run: secret-via-file
  name: secret-via-file
spec:
  containers:
  - image: redis
    name: secret-via-file
    volumeMounts:
    - name: redis-secret
      mountPath: /secrets
  volumes:
  - name: redis-secret
    secret:
      secretName: redis-secret

I created second pod name secret-via-env, using the redis image, which exports password as PASSWORD.

kubectl run secret-via-env --image=redis --dry-run=client -o yaml > pod2.yaml

I edited the pod2.yaml file. 

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: secrets-via-env
  name: secrets-via-env
spec:
  containers:
  - image: redis
    name: secrets-via-env
    env:
      - name: PASSWORD
        valueFrom:
          secretKeyRef:
            name: redis-secret
            key: password

I connect to the pod secrets-via-env with following command.

kubectl exec -it secret-via-file -- redis-cli

I try to verify if the secret is mounted to the pods. In the second pod I want to use the variable PASSWORD to retrieve the assigned value(0123456). I used the command below but it does not work.

SECRET GET PASSWORD

Upvotes: 0

Views: 1733

Answers (1)

P Ekambaram
P Ekambaram

Reputation: 17621

tried as below. i see the PASSWORD secret is getting listed as env inside pod

# create secret
kubectl create secret generic redis-secret --from-literal=password=0123456

# create pod
apiVersion: v1
kind: Pod
metadata:
  labels:
    run: secrets-via-env
  name: secrets-via-env
spec:
  containers:
  - image: redis
    name: secrets-via-env
    env:
    - name: PASSWORD
      valueFrom:
        secretKeyRef:
          name: redis-secret
          key: password

# check PASSWORD secret
master $ kubectl exec -it secrets-via-env sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
# echo $PASSWORD
0123456

# from first pod
---
apiVersion: v1
kind: Pod
metadata:
  labels:
    run: secret-via-file
  name: secret-via-file
spec:
  containers:
  - image: redis
    name: secret-via-file
    volumeMounts:
    - name: redis-secret
      mountPath: /secrets
  volumes:
  - name: redis-secret
    secret:
      secretName: redis-secret

controlplane $ kubectl exec -it secret-via-file sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
# ls -l /secrets
total 0
lrwxrwxrwx 1 root root 15 Jul 22 09:45 password -> ..data/password
# cat /secrets/password
0123456#

Upvotes: 2

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