ckad lab init commit

Signed-off-by: Ken Sipe <[email protected]>

Author: kensipe

Readme.md

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+# Labs for Certified Kubernetes Application Developer (CKAD)
+
+These labs support training necessary for passing the Certified Kubernetes Applcation Developer (CKAD) Test.
+
+## Requirements
+
+* git
+* Kubernetes 1.15+ cluster
+  * [Kubernetes in Docker (KinD)](https://github.com/kubernetes-sigs/kind) **note:** v0.7.0 used for lab creation
+  * [Minikube](https://kubernetes.io/docs/tasks/tools/install-minikube/)
+* curl or httpie
+
+## Notes:
+
+Common `alias k=kubectl`
+
+
+## Labs
+
+### Lab 1: [Kind Setup and Kubernetes Basics](lab1.md)
+
+### Lab 2: [Core Concepts](lab2.md)
+
+### Lab 3: [Configuration (ENV, Configs, Secrets, Tolerations and Affinity)]((lab3.md))
+
+### Lab 4: [Pod Design (Labels, Deployments, Jobs and Crons)](lab4.md)
+
+### Lab 5: [Observability](lab5.md)
+
+### Lab 6: [Services and Networking](lab6.md)
+
+### Lab 7: [State Persistence](lab7.md)
+
+
+** Multi-container does not have a specific lab
+
+## Tips and References
+
+* [Tips](tips.md)
+* [Bookmarks](bookmarks.html)

bookmarks.html

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+<!DOCTYPE NETSCAPE-Bookmark-file-1>
+<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
+<TITLE>Bookmarks</TITLE>
+<H1>Bookmarks</H1>
+<DL><p>
+    <DT><H3 ADD_DATE="1497301221" LAST_MODIFIED="1578373289" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Bar</H3>
+    <DL><p>
+        <DT><H3 ADD_DATE="1578373157" LAST_MODIFIED="1578748454">ckad</H3>
+        <DL><p>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/#list-containers-by-pod" >List All Container Images Running in a Cluster - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.github.io/ingress-nginx/examples/rewrite/" >Rewrite - NGINX Ingress Controller</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistent-volumes" >Persistent Volumes - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/storage/persistent-volumes/#claims-as-volumes" >Persistent Volumes - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/storage/volumes/#example-pod-2" >Volumes - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/services-networking/network-policies/" >Network Policies - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/" >Taints and Tolerations - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity" >Affinity Pods to Nodes - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/" >Jobs - Run to Completion - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/" >CronJob - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/#example" >ReplicaSet - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#creating-a-deployment" >Deployments - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/" >Configure Service Accounts for Pods - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/configuration/secret/#creating-a-secret-manually" >Secrets - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#create-configmaps-from-directories" >Configure a Pod to Use a ConfigMap - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/reference/kubectl/cheatsheet/#interacting-with-running-pods" >kubectl Cheat Sheet - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#meaning-of-memory" >Managing Compute Resources for Containers - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#rolling-back-a-deployment" >Deployments - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/services-networking/ingress/" >Ingress - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/debug-application-cluster/get-shell-running-container/" >Get a Shell to a Running Container - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/concepts/configuration/secret/#creating-a-secret-using-kubectl-create-secret" >Secrets Create- Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/configure-pod-container/configure-persistent-volume-storage/#create-a-persistentvolume" >PersistentVolume hostpath - Kubernetes</A>
+            <DT><A HREF="https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/" >Configure Liveness, Readiness and Startup Probes - Kubernetes</A>
+        </DL><p>
+    </DL><p>
+</DL><p>

kind-3.yaml

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+kind: Cluster
+apiVersion: kind.sigs.k8s.io/v1alpha3
+nodes:
+- role: control-plane
+- role: worker
+- role: worker

lab1.md

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+# Lab Kind, VI and YAML
+
+## Objective
+
+The focus of this lab is to become familar with kubernetes through the use of the kind kubernetes environemnt.  
+
+1. Start cluster
+
+`kind create cluster`
+
+```bash
+kind create cluster
+Creating cluster "kind" ...
+ ✓ Ensuring node image (kindest/node:v1.17.0) 🖼
+ ✓ Preparing nodes 📦  
+ ✓ Writing configuration 📜 
+⠊⠁ Starting control-plane 🕹️ on
+ ✓ Starting control-plane 🕹️ 
+ ✓ Installing CNI 🔌 
+ ✓ Installing StorageClass 💾 
+Set kubectl context to "kind-kind"
+You can now use your cluster with:
+
+kubectl cluster-info --context kind-kind
+
+Have a nice day! 👋
+```
+
+2. Setup the alias `alias k=kubectl`
+
+3. Get the kube version with `kubectl`
+
+```
+k version
+Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.6", GitCommit:"dff82dc0de47299ab66c83c626e08b245ab19037", GitTreeState:"clean", BuildDate:"2020-07-16T00:04:31Z", GoVersion:"go1.14.4", Compiler:"gc", Platform:"darwin/amd64"}
+Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2020-01-14T00:09:19Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
+```
+
+4. api-resouces
+
+Lets get a list of resources from `kubectl`
+`k api-resources`
+
+Which resources are namespaced? and which are cluster scoped?
+
+For cluster scoped: `k api-resources --namespaced=false`
+
+What is the shortname for `PodSecurityPolicy`?
+
+5. Explaining Resources
+
+Explain is a great way to understand the defined structure of a resource or kind.  This is accomplish through `k explain <kind>`
+
+`k explain ns`
+
+Almost all resources at this high level report roughly the same apiVersion, kind, metadata, spec, status information.  In order to get the full structure of this kind use the `--recursive` flag.
+
+`k explain ns --recursive`
+
+Notice the status field `phase`.  Let's display that as an output.
+
+`k get ns -o custom-columns=NAME:.metadata.name,PHASE:.status.phase`
+
+Example output:
+```
+NAME                 PHASE
+default              Active
+kube-node-lease      Active
+kube-public          Active
+kube-system          Active
+local-path-storage   Active
+```
+
+Explain is incredibly useful in understanding the structure of types deployed in kubernetes.
+
+6. Increase verbosity
+
+Get the namespaces again using the `-v #` such as `-v 6`
+
+```
+ k get ns -v 6
+I0821 08:59:23.530922    5867 loader.go:375] Config loaded from file:  /Users/kensipe/.kube/config
+I0821 08:59:23.546835    5867 round_trippers.go:443] GET https://127.0.0.1:32769/api/v1/namespaces?limit=500 200 OK in 11 milliseconds
+```
+
+increase to max value of `9`
+
+7. Setup  VI
+
+Install if missing... 
+
+` vi ~/.vimrc`
+
+```
+:set number
+:set et
+:set sw=2 ts=2 sts=2
+```
+
+8. VI Working with YAML
+
+```
+k create deployment nginx --image=nginx --dry-run -o yaml > pod.yaml
+
+vi pod.yaml
+```
+
+## Summary
+
+At the conclusion of this lab, you should be familar with starting and delete a kind cluster along with interact with the cluster via `kubectl`.  Additionally, you should be comfortable with working with VI, setting up tab stops and work with `kubectl` to create YAML manifests.

lab2-1.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: lab2-1
+spec:
+  containers:
+  - image: foo
+    name: nginx

lab2.md

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+# Lab Kube Basics
+
+## Objective
+
+The focus of this lab is to become familar the different kubernetes objects that affect Pods.  This includes namespaces and deployments.
+
+1. In 1 terminal or tab, watch for pods
+
+`k get pod -w`
+
+2. Create a pod imperatively
+
+`k run nginx --image nginx`
+
+Watch pod cycle thru statuses
+
+3. Without examining the yaml... deploy lab2-1.yaml to cluster:
+
+`k apply -f lab2-1.yaml`
+
+Did it deploy?  What is the status?  Why?
+
+Edit pod and fix
+
+4. Look a entire cluster
+
+`k get all`
+
+**note:** This is a handy command to understand the entire environment for a test question.
+
+5. Delete all pods
+
+`k delete pod --all`
+
+6. Create a ReplicaSet for nginx pod with 3 replicas
+
+image: nginx
+
+7. Delete and Create Deployment for nginx Pod with 3 replicas
+
+image: nginx
+
+8. Update the Deployment Image to `nginx:1.7.9`
+
+9. Create namespace `foo`
+
+10. Change context use `foo` is the default context
+
+
+## Summary
+
+After lab 1 and 2, you should be comfortable with create and deleting pods, along with creating ReplicaSets and Deployments.

lab3.md

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+# Lab CKAD Configuration
+
+## Objective
+
+The focus of this lab is to become familar with quickly starting a pod imperatively.  This lab is also setup to understand how to debug and env either by starting a shell in a pod or by executing a pod with a specific command.
+
+1. Execute an imperative command to see what is in a standard Pods ENV
+
+```
+kubectl run busybox --image=busybox --command --restart=Never -- env
+```
+
+How do you see the output?
+
+2. Add an ENV to the pod from step 1.  (you'll like to add it to the yaml and replace)
+
+3. Create a config map with the key `APP_ENV` and value of `dev`
+
+4. Create a pod that shows the mapping
+
+5. Create a namespace foo, what is the value of the service account token?
+
+6. Start a shell in a pod (start an nginx pod if one isn't running) and view the mounted token.
+
+`k exec -it nginx /bin/bash`
+
+7. Recreate cluster with multi-nodes and run nginx pod
+
+```
+# needs kind and kubectl on path
+./setup-lab3.sh
+```
+wait for "Lab 3 is Ready"
+
+Launch a standard pod:  `k run nginx --image nginx`
+
+What is the status?  Why?
+
+Fix the pod.
+
+8.  What does the following command do?
+
+`kubectl patch nodes kind-worker -p '{"spec":{"taints":[]}}'`
+
+9. Node `kind-worker` has a label that doesn't exist on `kind-worker2`.  Create a pod that has node affinity to this node `kind-worker` passed on this label.

lab4.md

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+# Lab CKAD Pod Design
+
+## Objective
+
+The focus of this lab is to be able to debug and access a cluster by get a pods yaml or by inspecting it's "description" through `describe`.  Additionally, you will rollout a deployment and roll it back.
+
+1. Setup Lab 4 by running `./setup-lab4.sh`. (without looking at sipt yet)
+
+2. Question to answer about cluster:
+
+    How many pods have the label `app=front-end`?
+    How many pods in total?
+    How many pods in `foo` namespace?
+    How many pods with label `app=front-end` in entire cluster?
+    Display all of them?
+
+3. Create and run Deployment file which matches the nginx pods with the `app=front-end` label with replicas = 4.
+
+4. Change the image to `nginx:1.9.1` for the deployment
+
+    hint: `k set image deploy nginx nginx=nginx:1.9.1`
+
+5. Looking at deployment rollout history
+
+6. Undo the last rollout
+
+7. Create a Job that will run every 2 mins and print to STDOUT a random number.  What is the value of the 1st random number?
+
+    hint: `shuf -i 0-999 -n1` will print a random number 0 - 999
+    hint: `*/2 * * * *` is a cron for every 2 mins

lab5-1.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: webapp
+  labels:
+    name: webapp
+spec:
+  containers:
+  - name: webapp
+    image: nginx
+    ports:
+      - containerPort: 80
+    readinessProbe:
+      httpGet:
+        path: /
+        port: 8080

lab5.md

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+# Lab CKAD Observability
+
+## Objective
+
+The focus of this lab is to become familar with pod readiness and liveliness.
+
+1. Clear all pods
+
+`k delete pod --all`
+
+2. Run the following pod:
+
+`kubectl run box --image=busybox -- /bin/sh -c  'i=0; while true; do echo "$i: $(date)"; i=$((i+1)); sleep 1; done'`
+
+3. Read the logs of this pod
+
+4. IF there were more than 1 container... how would you view logs of this container?
+
+5. Without looking at the file, apply the manifest `lab5-1.yaml`
+
+6. What is the status of the pod?
+
+7. Is it ready?  
+
+8. Fix any issue
+
+