Added links to official documentation before an exercise. (dgkanatsio…

…s#41)

* Added links to official documentation before an exercise

* fixed spelling

README.md

@@ -6,6 +6,8 @@
 
 A set of exercises that helped me prepare for the [Certified Kubernetes Application Developer](https://www.cncf.io/certification/ckad/) exam, offered by the Cloud Native Computing Foundation, organized by curriculum domain. They may as well serve as learning and practicing with Kubernetes.
 
+During the exam, you are allowed to keep only one other browser tab open to refer official documentation. Make a mental note of the breadcrumb at the start of the excercise section, to quickly locate the relevant document in kubernetes.io. It is recommended that you read official documents before attempting exercises below it.
+
 ## Contents
 
 - [Core Concepts - 13%](a.core_concepts.md)

a.core_concepts.md

@@ -1,6 +1,16 @@
 ![](https://gaforgithub.azurewebsites.net/api?repo=CKAD-exercises/core_concepts&empty)
 # Core Concepts (13%)
 
+kubernetes.io > Documentation > Reference > kubectl CLI > [kubectl Cheat Sheet](https://kubernetes.io/docs/reference/kubectl/cheatsheet/)
+
+kubernetes.io > Documentation > Tasks > Monitoring, Logging, and Debugging > [Get a Shell to a Running Container](https://kubernetes.io/docs/tasks/debug-application-cluster/get-shell-running-container/)
+
+kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > [Configure Access to Multiple Clusters](https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/)
+
+kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > [Accessing Clusters](https://kubernetes.io/docs/tasks/access-application-cluster/access-cluster/) using API
+
+kubernetes.io > Documentation > Tasks > Access Applications in a Cluster > [Use Port Forwarding to Access Applications in a Cluster](https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/)
+
 ### Create a namespace called 'mynamespace' and a pod with image nginx called nginx on this namespace
 
 <details><summary>show</summary>

c.pod_design.md

@@ -165,6 +165,8 @@ kubectl delete po nginx{1..3}
 
 ## Deployments
 
+kubernetes.io > Documentation > Concepts > Workloads > Controllers > [Deployments](https://kubernetes.io/docs/concepts/workloads/controllers/deployment)
+
 ### Create a deployment with image nginx:1.7.8, called nginx, having 2 replicas, defining port 80 as the port that this container exposes (don't create a service for this deployment)
 
 <details><summary>show</summary>
@@ -637,6 +639,8 @@ kubectl delete job busybox
 
 ## Cron jobs
 
+kubernetes.io > Documentation > Tasks > Run Jobs > [Running Automated Tasks with a CronJob](https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/)
+
 ### Create a cron job with image busybox that runs on a schedule of "*/1 * * * *" and writes 'date; echo Hello from the Kubernetes cluster' to standard output
 
 <details><summary>show</summary>

d.configuration.md

@@ -3,6 +3,8 @@
 
 ## ConfigMaps
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure a Pod to Use a ConfigMap](https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/)
+
 ### Create a configmap named config with values foo=lala,foo2=lolo
 
 <details><summary>show</summary>
@@ -221,6 +223,8 @@ cat var8 # will show val8
 
 ## SecurityContext
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure a Security Context for a Pod or Container](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/)
+
 ### Create the YAML for an nginx pod that runs with the UID 101. No need to create the pod
 
 <details><summary>show</summary>
@@ -293,6 +297,8 @@ status: {}
 
 ## Requests and limits
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Assign CPU Resources to Containers and Pods](https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/)
+
 ### Create an nginx pod with requests cpu=100m,memory=256Mi and limits cpu=200m,memory=512Mi
 
 <details><summary>show</summary>
@@ -307,6 +313,10 @@ kubectl run nginx --image=nginx --restart=Never --requests='cpu=100m,memory=256M
 
 ## Secrets
 
+kubernetes.io > Documentation > Concepts > Configuration > [Secrets](https://kubernetes.io/docs/concepts/configuration/secret/)
+
+kubernetes.io > Documentation > Tasks > Inject Data Into Applications > [Distribute Credentials Securely Using Secrets](https://kubernetes.io/docs/tasks/inject-data-application/distribute-credentials-secure/)
+
 ### Create a secret called mysecret with the values password=mypass
 
 <details><summary>show</summary>
@@ -448,6 +458,8 @@ kubectl exec -it nginx -- env | grep USERNAME | cut -d '=' -f 2 # will show 'adm
 
 ## ServiceAccounts
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure Service Accounts for Pods](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/)
+
 ### See all the service accounts of the cluster in all namespaces
 
 <details><summary>show</summary>

e.observability.md

@@ -3,6 +3,8 @@
 
 ## Liveness and readiness probes
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure Liveness and Readiness Probes](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)
+
 ### Create an nginx pod with a liveness probe that just runs the command 'ls'. Save its YAML in pod.yaml. Run it, check its probe status, delete it.
 
 <details><summary>show</summary>

f.services.md

@@ -159,6 +159,8 @@ kubectl delete deploy foo
 
 ### Create an nginx deployment of 2 replicas, expose it via a ClusterIP service on port 80. Create a NetworkPolicy so that only pods with labels 'access: true' can access the deployment and apply it
 
+kubernetes.io > Documentation > Concepts > Services, Load Balancing, and Networking > [Network Policies](https://kubernetes.io/docs/concepts/services-networking/network-policies/)
+
 <details><summary>show</summary>
 <p>
 

g.state.md

@@ -1,6 +1,10 @@
 ![](https://gaforgithub.azurewebsites.net/api?repo=CKAD-exercises/state&empty)
 # State Persistence (8%)
 
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure a Pod to Use a Volume for Storage](https://kubernetes.io/docs/tasks/configure-pod-container/configure-volume-storage/)
+
+kubernetes.io > Documentation > Tasks > Configure Pods and Containers > [Configure a Pod to Use a PersistentVolume for Storage](https://kubernetes.io/docs/tasks/configure-pod-container/configure-persistent-volume-storage/)
+
 ## Define volumes 
 
 ### Create busybox pod with two containers, each one will have the image busybox and will run the 'sleep 3600' command. Make both containers mount an emptyDir at '/etc/foo'. Connect to the second busybox, write the first column of '/etc/passwd' file to '/etc/foo/passwd'. Connect to the first busybox and write '/etc/foo/passwd' file to standard output. Delete pod.