From a0f9db9382f0cffd32275f76a4332afee20c39d2 Mon Sep 17 00:00:00 2001
From: Alpha <AlphaWong@users.noreply.github.com>
Date: Sun, 19 Apr 2020 19:54:06 +0800
Subject: [PATCH] Update secret.md

---
 .../en/docs/concepts/configuration/secret.md  | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/content/en/docs/concepts/configuration/secret.md b/content/en/docs/concepts/configuration/secret.md
index dc9a214fa3..90d57704b4 100644
--- a/content/en/docs/concepts/configuration/secret.md
+++ b/content/en/docs/concepts/configuration/secret.md
@@ -854,6 +854,43 @@ start until all the Pod's volumes are mounted.
 
 ## Use cases
 
+### Use-Case: As container environment variables
+
+Create a secret
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysecret
+type: Opaque
+data:
+  USER_NAME: YWRtaW4=
+  PASSWORD: MWYyZDFlMmU2N2Rm
+```
+
+Create the Secret:
+```shell
+kubectl apply -f mysecret.yaml
+```
+
+Use `envFrom` to define all of the Secret’s data as container environment variables. The key from the Secret becomes the environment variable name in the Pod.
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: secret-test-pod
+spec:
+  containers:
+    - name: test-container
+      image: k8s.gcr.io/busybox
+      command: [ "/bin/sh", "-c", "env" ]
+      envFrom:
+      - secretRef:
+          name: mysecret
+  restartPolicy: Never
+```
+
 ### Use-Case: Pod with ssh keys
 
 Create a secret containing some ssh keys: