Document examples of downward API exposing container resources via

environment variables and volumes.
2016-06-01 16:15:50 -04:00
parent ee396b4439
commit d45e0ce4df
5 changed files with 194 additions and 11 deletions
@@ -0,0 +1,40 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: kubernetes-downwardapi-volume-example
+spec:
+  containers:
+    - name: client-container
+      image: gcr.io/google_containers/busybox:1.24
+      command: ["sh", "-c", "while true; do echo; if [[ -e /etc/cpu_limit ]]; then cat /etc/cpu_limit; fi; if [[ -e /etc/cpu_request ]]; then cat /etc/cpu_request; fi; if [[ -e /etc/mem_limit ]]; then cat /etc/mem_limit; fi; if [[ -e /etc/mem_request ]]; then cat /etc/mem_request; fi; sleep 5; done"]
+      resources:
+        requests:
+          memory: "32Mi"
+          cpu: "125m"
+        limits:
+          memory: "64Mi"
+          cpu: "250m"
+      volumeMounts:
+        - name: podinfo
+          mountPath: /etc
+          readOnly: false
+  volumes:
+    - name: podinfo
+      downwardAPI:
+        items:
+          - path: "cpu_limit"
+            resourceFieldRef:
+              containerName: client-container
+              resource: limits.cpu
+          - path: "cpu_request"
+            resourceFieldRef:
+              containerName: client-container
+              resource: requests.cpu
+          - path: "mem_limit"
+            resourceFieldRef:
+              containerName: client-container
+              resource: limits.memory
+          - path: "mem_request"
+            resourceFieldRef:
+              containerName: client-container
+              resource: requests.memory