add secrets notes

Author: paularah

commands-and-args/notes.md

@@ -0,0 +1 @@
+commmand field in the po defintion corresponds to entrypoint field in docker and while args field corresponds to the CMD field in docker 

commands-and-args/pod-definition.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Pod 
+metadata:
+  name: ubuntu-sleeper 
+  labels: 
+    type: sleeper 
+spec:
+  containers:
+   - image: ubuntu 
+     command: ["sleep"]
+     args: ["10"]

config-maps/.notes.md.swp

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: ConfigMap 
+metadata: 
+  name: app-config
+data:
+  APP_COLOR: BLUE 

config-maps/app-config.yaml

@@ -0,0 +1,7 @@
+## Importat commands 
+
+
+`kubectl create configmap app-config --from-literal=<KEY>=<VALUE>`
+
+envFrom in the corresponding pod defintion file is an array field, this makes sense be cuase you can specify muktile config maps in a pod. `:wq
+

config-maps/notes.md

@@ -14,3 +14,11 @@ count the nnumber of namespaces on a cluster
 get  pods or another object type in all namespaces on a cluster 
 
 `kubectl get pods --all-namespaces | grep <specific pod>`
+
+short form for all namesapces is `A`
+
+k8s creates a `kubesystem` namespace to isolate k8s resources from the user, preventing an accidental deletion of k8s resources. 
+
+resources that should be available to all users are in the kube public namespace.
+
+

namespaces/note.md

@@ -0,0 +1 @@
+limits computes resources by namespaces.