Add Circle CI questions

In addition to a couple of k8s questions.

topics/kubernetes/exercises/node_selectors/exercise.md

@@ -0,0 +1,12 @@
+# Node Selectors
+
+## Objectives
+
+1. Apply the label "hw=max" on one of the nodes in your cluster
+2. Create and run a Pod called `some-pod` with the image `redis` and configure it to use the selector `hw=max`
+3. Explain why node selectors might be limited
+
+
+## Solution
+
+Click [here](solution.md) to view the solution

topics/kubernetes/exercises/node_selectors/solution.md

@@ -0,0 +1,29 @@
+# Node Selectors
+
+## Objectives
+
+1. Apply the label "hw=max" on one of the nodes in your cluster
+2. Create and run a Pod called `some-pod` with the image `redis` and configure it to use the selector `hw=max`
+3. Explain why node selectors might be limited
+
+
+## Solution
+
+Click [here](solution.md) to view the solution
+
+1. `kubectl label nodes some-node hw=max`
+2. 
+
+```
+kubectl run some-pod --image=redis --dry-run=client -o yaml > pod.yaml
+
+vi pod.yaml
+
+spec:
+  nodeSelector:
+    hw: max
+
+kubectl apply -f pod.yaml
+```
+
+3. Assume you would like to run your Pod on all the nodes with with either `hw` set to max or to min, instead of just max. This is not possible with nodeSelectors which are quite simplified and this is where you might want to consider `node affinity`.

topics/kubernetes/exercises/taints_101/exercise.md

@@ -6,12 +6,8 @@
 2. Create a taint on one of the nodes in your cluster with key of "app" and value of "web" and effect of "NoSchedule"
    1. Explain what it does exactly
    2. Verify it was applied
+3. Run a Pod that will be able to run on the node on which you applied the taint
 
 ## Solution
 
-Click [here](solution.md) to view the solution.
-
-1. `kubectl describe no minikube | grep -i taints`
-2. `kubectl taint node minikube app=web:NoSchedule`
-   1. Any resource with "app=web" key value will not be scheduled on node `minikube`
-   2. `kubectl describe no minikube | grep -i taints`
+Click [here](solution.md) to view the solution.

topics/kubernetes/exercises/taints_101/solution.md

@@ -0,0 +1,30 @@
+# Taints 101
+
+## Objectives
+
+1. Check if one of the nodes in the cluster has taints (doesn't matter which node)
+2. Create a taint on one of the nodes in your cluster with key of "app" and value of "web" and effect of "NoSchedule"
+   1. Explain what it does exactly
+   2. Verify it was applied
+
+## Solution
+
+1. `kubectl describe no minikube | grep -i taints`
+2. `kubectl taint node minikube app=web:NoSchedule`
+   1. Any resource with "app=web" key value will not be scheduled on node `minikube`
+   2. `kubectl describe no minikube | grep -i taints`
+3. 
+
+```
+kubectl run some-pod --image=redis
+kubectl edit po some-pod
+```
+
+```
+ - effect: NoSchedule
+    key: app
+    operator: Equal
+    value: web
+```
+
+Save and exit. The Pod should be running.