Add 57 new questions and exercises

Author: abregman

README.md

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+## Ansible - My First Playbook
+
+1. Write a playbook that will:
+  a. Install the package zlib
+  b. Create the file `/tmp/some_file`
+2. Run the playbook on a remote host

exercises/ansible/my_first_playbook.md

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+## Ansible - My First Task
+
+1. Write a task to create the directory ‘/tmp/new_directory’

exercises/ansible/my_first_task.md

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+## My first playbook - Solution
+
+1. `vi first_playbook.yml`
+
+```
+- name: Install zlib and create a file
+  hosts: some_remote_host
+  tasks:
+    - name: Install zlib
+      package:
+        name: zlib
+        state: present
+      become: yes
+    - name: Create the file /tmp/some_file
+        path: '/tmp/some_file'
+        state: touch
+```
+
+2. First, edit the inventory file: `vi /etc/ansible/hosts`
+
+```
+[some_remote_host]
+some.remoted.host.com
+```
+
+Run the playbook
+
+`ansible-playbook first_playbook.yml`

exercises/ansible/solutions/my_first_playbook.md

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+## My First Task - Solution
+
+```
+- name: Create a new directory
+  file:
+    path: "/tmp/new_directory"
+    state: directory
+```

exercises/ansible/solutions/my_first_task.md

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+## Deploy to Kubernetes
+
+* Write a pipeline that will deploy an "hello world" web app to Kubernete 
+* The CI/CD system (where the pipeline resides) and the Kubernetes cluster should be on separate systems
+* The web app should be accessible remotely and only with HTTPS

exercises/devops/deploy_to_kubernetes.md

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+pipeline {
+
+  agent any
+
+  stages {
+
+    stage('Checkout Source') {
+      steps {
+        git url:'https://github.com/<GITHUB_USERNAME>/<YOUR_WEB_APP_REPO>.git',
+        // credentialsId: 'creds_github',
+        branch:'master'
+      }
+    }
+    
+      stage("Build image") {
+            steps {
+                script {
+                    myapp = docker.build("<YOUR_DOCKER_USERNAME>/helloworld:${env.BUILD_ID}")
+                }
+            }
+        }
+    
+      stage("Push image") {
+            steps {
+                script {
+                    docker.withRegistry('https://registry.hub.docker.com', 'dockerhub') {
+                            myapp.push("latest")
+                            myapp.push("${env.BUILD_ID}")
+                    }
+                }
+            }
+        }
+
+    
+    stage('Deploy App') {
+      steps {
+        script {
+          sh 'ansible-playbook deploy.yml'
+        }
+      }
+    }
+
+  }
+
+}

exercises/devops/solutions/deploy_to_kubernetes/Jenkinsfile

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+## Deploy to Kubernetes
+
+Note: this exercise can be solved in various ways. The solution described here is just one possible way.
+
+1. Install Jenkins on one system (follow up the standard Jenkins installation procedure)
+2. Deploy Kubernetes on a remote host (minikube can be an easy way to achieve it)
+3. Create a simple web app or [page](html)
+
+4. Create Kubernetes [resoruces](helloworld.yml) - Deployment, Service and Ingress (for HTTPS access)
+5. Create an [Ansible inventory](inventory) and insert the address of the Kubernetes cluster
+6. Write [Ansible playbook](deploy.yml) to deploy the Kubernetes resources and also generate 
+7. Create a [pipeline](Jenkinsfile)
+
+8. Run the pipeline :)
+9. Try to access the web app remotely

exercises/devops/solutions/deploy_to_kubernetes/README.md

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+- name: Apply Kubernetes YAMLs
+  hosts: kubernetes
+  tasks:
+    - name: Ensure SSL related directories exist
+      file:
+        path: "{{ item }}"
+        state: directory
+      loop:
+        - "/etc/ssl/crt"
+        - "/etc/ssl/csr"
+        - "/etc/ssl/private"
+
+    - name: Generate an OpenSSL private key.
+      openssl_privatekey:
+        path: /etc/ssl/private/privkey.pem
+
+    - name: generate openssl certficate signing requests
+      openssl_csr:
+        path: /etc/ssl/csr/hello-world.app.csr
+        privatekey_path: /etc/ssl/private/privkey.pem
+        common_name: hello-world.app
+
+    - name: Generate a Self Signed OpenSSL certificate
+      openssl_certificate:
+        path: /etc/ssl/crt/hello-world.app.crt
+        privatekey_path: /etc/ssl/private/privkey.pem
+        csr_path: /etc/ssl/csr/hello-world.app.csr
+        provider: selfsigned
+
+    - name: Create k8s secret
+      command: "kubectl create secret tls tls-secret --cert=/etc/ssl/crt/hello-world.app.crt --key=/etc/ssl/private/privkey.pem"
+      register: result
+      failed_when:
+        - result.rc == 2
+          
+    - name: Deploy web app
+      k8s:
+        state: present
+        definition: "{{ lookup('file', './helloworld.yml') }}"
+        kubeconfig: '/home/abregman/.kube/config'
+        namespace: 'default'
+        wait: true

exercises/devops/solutions/deploy_to_kubernetes/deploy.yml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hello-blue-whale
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: hello-world-app
+      version: blue
+  template:
+    metadata:
+      name: hello-blue-whale-pod
+      labels:
+        app: hello-world-app
+        version: blue
+    spec:
+      containers:
+      - name: hello-whale-container
+        image: abregman2/helloworld:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 80
+        - containerPort: 443
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: hello-world
+  labels:
+    app: hello-world-app
+spec:
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: hello-world-app
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: example-ingress
+  annotations:
+      cert-manager.io/cluster-issuer: selfsigned-issuer
+      nginx.ingress.kubernetes.io/rewrite-target: /
+      kubernetes.io/ingress.class: nginx
+spec:
+  tls:
+  - hosts:
+      - hello-world.app
+    secretName: shhh
+  rules:
+    - host: hello-world.app
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: hello-world
+                port:
+                  number: 80