stern: add page (#3517)

pages/osx/stern.md

@@ -0,0 +1,24 @@
+# Stern
+
+> Tail Logs from multiple pods and multiple containers on Kubernetes.
+> More information: <https://github.com/wercker/stern>.
+
+- Tail logs from a specific namespace:
+
+`stern {{pod_name}} --container {{container}} --namespace {{namespace}}`
+
+- Tail logs using a particular configuration file:
+
+`stern {{pod_name}} --container {{container}} --kubeconfig {{path/to/kubeconfig_file}}`
+
+- Display the last 2 hours worth of logs, tailing for newer ones:
+
+`stern {{pod_name}} --container {{container}} --since {{2h}}`
+
+- Tail logs from pods that have specific labels across all namespaces:
+
+`stern --container {{container}} -l "{{KEY1=VALUE1,KEY2=VALUE2}}" --all-namespaces`
+
+- Tail logs from containers whose name starts with "XYZ":
+
+`stern {{pod_name}} --container "{{XYZ*}}"`