<p>Is there a way to populate the serviceaccount secrets content to an environment variable?</p>

<p>Example: when a pod is started, it contains a <code>/var/run/secrets/kubernetes.io/secrets/serviceaccount/</code> folder that contains <code>token</code>, <code>ca.crt</code>... and other that is the result to map the <code>serviceaccount</code> sercret to a folder.</p>

<p>Is there anyway to map <code>serviceaccountsecret.token</code> to an environment variable?</p>

<p><strong>EDIT</strong></p>

<p>I'm deploying kubernetes/openshift objects using fabric8 maven plugin. Nevertheless, I was looking for a way of setting this information up on PodSpec.</p>

<p>So, currently openshift/kubernetes is mapping service account information located into secrets and then it's automatically mapped to filesystem (`/var/run...).</p>

<p>I'm looking for a way to map this "unknown" service account secret to environment variable (I mean, I don't know which is the name of this secret, when I'm creating PodSpec).</p>

<pre><code>$ oc get secrets
NAME                       TYPE                                  DATA      AGE
builder-dockercfg-hplx4    kubernetes.io/dockercfg               1         43m
builder-token-bkd8h        kubernetes.io/service-account-token   4         43m
builder-token-gpckp        kubernetes.io/service-account-token   4         43m
default-dockercfg-q2vpx    kubernetes.io/dockercfg               1         43m
default-token-hpr7l        kubernetes.io/service-account-token   4         43m
default-token-r5225        kubernetes.io/service-account-token   4         43m
deployer-dockercfg-6h7nw   kubernetes.io/dockercfg               1         43m
deployer-token-svmvf       kubernetes.io/service-account-token   4         43m
deployer-token-tmg9x       kubernetes.io/service-account-token   4         43m
vault-cert                 kubernetes.io/tls                     2         42m 
</code></pre>

<p>As you can see, openshiftshift/kubernetes creates secrets regarding with each service account:</p>

<pre><code>$ oc get sa
NAME       SECRETS   AGE
builder    2         44m
default    2         44m
deployer   2         44m
</code></pre>

<p>Each secret has a form like:</p>

<pre><code>$ oc describe secret default-token-hpr7l
Name:         default-token-hpr7l
Namespace:    ra-sec
Labels:       &lt;none&gt;
Annotations:  kubernetes.io/created-by=openshift.io/create-dockercfg-secrets
              kubernetes.io/service-account.name=default
              kubernetes.io/service-account.uid=82ae89d7-898a-11e8-8d35-f28ae3e0478e

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:          1070 bytes
namespace:       6 bytes
service-ca.crt:  2186 bytes
token:           eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJyYS1zZWMiLCJrdWJlcm5ldGVzLmlvL3Nl...
</code></pre>

<p>Each secret is mapped to filesystem automatically. Nevertheless, I'd like to write into PodSpec:</p>

<pre><code>env:
- name: KUBERNETES_TOKEN
  valueFrom:
    secretKeyRef:
      name: &lt;unknown service account secret name&gt;
      key: token
</code></pre>

<p>I hope I've explianed a bit better.</p>

<p>You can create a secret annotated with <code>kubernetes.io/service-account.name</code> annotation.</p>

<p>This annotation provides related service account information to current secret.</p>

<pre><code>apiVersion: v1
kind: Secret
metadata:
  name: vault-auth-secret
  annotations:
    kubernetes.io/service-account.name: vault-auth
type: kubernetes.io/service-account-token
</code></pre>

<p>By this way, you are able to create a named secret with desired data.</p>

<pre><code>- name: KUBERNETES_TOKEN
  valueFrom:
    secretKeyRef:
      name: vault-auth-secret
      key: token
</code></pre>
