GCP Google Cloud Platform - Implement Continuous Integrationf for a Dockerized App

Step-01: Introduction¶

Implement Continuous Integration for our application myapp1
GCP Artifact Registry
GCP Cloud Build
GitHub Repository
GitHub Cloud Build Application from GitHub Marketplace

GitHub Reposotories¶

GKE Infrastructure Gitrepo: terraform-gcp-gke-infra-devops
Kubernetes manifests Gitrepo: terraform-gcp-gke-k8s-devops
Application Gitrepo: terraform-gcp-gke-app-devops

Step-02: Create Artifact Registry¶

Go to Google Cloud -> Artifact Registry - CREATE
Name: myapps-repository
Format: Docker
Mode: Remote
Location type: Region
Region: us-central1
REST ALL LEAVE TO DEFAULTS
Click on CREATE

Step-03: Review or Create GIT Repo Files¶

Step-03-01: Dockerfile¶

FROM nginx
COPY index.html /usr/share/nginx/html

Step-03-02: index.html¶

<!DOCTYPE html>
<html>
   <body style="background-color:rgb(200, 145, 130);">
      <h1>Welcome to StackSimplify</h1>
      <p>Google Kubernetes Engine</p>
      <p>Application Version: V601</p>
   </body>
</html>

Step-03-03: cloudbuild.yaml¶

# [START cloudbuild - Docker Image Build]
steps:
# This step builds the container image.
- name: 'gcr.io/cloud-builders/docker'
  id: Build Docker Image
  args:
  - 'build'
  - '-t'
  - 'us-central1-docker.pkg.dev/$PROJECT_ID/myapps-repository/myapp1:$SHORT_SHA'
  - '.'

# This step pushes the image to Artifact Registry
# The PROJECT_ID and SHORT_SHA variables are automatically
# replaced by Cloud Build.
- name: 'gcr.io/cloud-builders/docker'
  id: Push Docker Image
  args:
  - 'push'
  - 'us-central1-docker.pkg.dev/$PROJECT_ID/myapps-repository/myapp1:$SHORT_SHA'
# [END cloudbuild - Docker Image Build]

Step-04: GitHub: Create new GitHub Repository¶

Go to GitHub -> Repositories Tab -> Click on NEW
Repository name: terraform-gcp-gke-app-devops
Description: Implement Continuous Integration for a simple application
Type: Private
Initialize this repository with: Add a README file
Click on Create Repository

Step-05: Local Desktop: Clone GitRepo and Update all the files dicussed in Step-02¶

# Clone GitHub Repository
git clone git@github.com:stacksimplify/terraform-gcp-gke-app-devops.git

# Copy Files from "GIT-Repo-Files" folder
1. Dockerfile
2. index.html
3. cloudbuild.yaml
4. .gitignore
5. git-deploy.sh

# Commit and Push files to remote git repo
git status
git add .
git commit -am "Base commit"
git push

Step-06: GitHub: Configure GCP Cloud Build on GitHub [IGNORE - IF ALREADY CONFIGURED]¶

Go to link GitHub Marketplace - Google Cloud Build
Click on Set up with Google Cloud Build
Only select repositories: stacksimplify/terraform-gcp-gke-app-devops
Click on Install
Login to Google Cloud and Click on Authorize Google Cloud Build
Select project in GCP: gcplearn9
IF ALREADY CONFIGURED, PLEASE IGNORE THIS STEP

Step-07: GCP Cloud Build: Create HOST Connection [IGNORE - IF ALREADY CONFIGURED]¶

Go to Cloud Build -> Repositories -> 2nd Gen -> CREATE HOST CONNECTION
Select Provider: GitHub
Configure Connection:
Region: us-central1
Name: myapp1-workloads
Click on CONNECT
Click on CONTINUE
Use an existing GitHub installation:
- Installation: stacksimplify
- Click on CONFIRM
IF ALREADY CONFIGURED, PLEASE IGNORE THIS STEP

Step-08: GCP Cloud Build: Link Repository¶

Go to Cloud Build -> Repositories -> 2nd Gen -> myapp1-workloads -> LINK REPOSITORY
Connection: myapp1-workloads
Repository: stacksimplify/terraform-gcp-gke-app-devops
Repository name: Generated
Click on LINK

Step-09: GCP Cloud Build: Create Trigger¶

Go to Cloud Build -> Triggers -> CREATE TRIGGER
Name: myapp1-ci
Region: us-central1
Description: My App1 Continuous Integration trigger
Event:
Repository event that invokes trigger: Push to a branch
Source:
Repository generation: 2nd gen
Repository: stacksimplify-terraform-gcp-gke-app-devops
Branch: .* (any branch)
Configuration:
Type: Cloud Build configuration file (yaml or json)
Location:
Repository: stacksimplify-terraform-gcp-gke-app-devops (GitHub)
Cloud Build configuration file location: cloudbuild.yaml
Advanced:
Approval: Require approval before build executes
REST ALL LEAVE TO DEFAULTS
Click on CREATE

Step-10: Run the first build¶

Step-10-01: Verify Build process¶

Go to Cloud Build -> Triggers -> myapp1-ci -> RUN
Verify Build progress
Go to Cloud Build -> History -> APPROVE
Verify BUILD PROGRESS AND STEPS

Step-10-02: Verify Docker Image in Artifact Registry¶

Go to Artifact Registry -> myapps-repository -> myapp1
Verify the new docker image tag

Step-11: Deploy this Docker Image on GKE Dev Cluster¶

Step-11-01: Update modules/kubernetes_deployment/main.tf¶

Update Docker Image path and tag in main.tf

# Before
image = "us-central1-docker.pkg.dev/GOOGLE_CLOUD_PROJECT/myapps-repository/myapp1:COMMIT_SHA"

# Replace GOOGLE_CLOUD_PROJECT,  COMMIT_SHA
image = "us-central1-docker.pkg.dev/gcplearn9/myapps-repository/myapp1:xxxxx"

Step-11-02: Execute Terraform Commands and Verify¶

# Change Directory
cd p2-k8sresources-terraform-manifests

# Terraform Initialize
terraform init

# Terraform Validate
terraform validate

# Terraform Plan
terraform plan

# Terraform Apply
terraform apply -auto-approve

# Verify the deployed application
http://<LOAD-BALANCER-IP>
Observation: 
1. V1 App displayed

Step-12: Make changes to App and Check-in code and Verify second build¶

Go to Github repo -> terraform-gcp-gke-app-devops > Update index.html

<!DOCTYPE html>
<html>
   <body style="background-color:rgb(200, 145, 130);">
      <h1>Welcome to StackSimplify</h1>
      <p>Google Kubernetes Engine</p>
      <p>Application Version: V2</p>
   </body>
</html>

Check-in code

# Check-in code
git add .
git commit -am "V2 Commit"
git push

Step-12: Verify the second build and Docker Image in Artifact Registry¶

Go to Artifact Registry -> myapps-repository -> myapp1
Verify the new docker image tag

Step-13: Deploy this Docker Image on GKE Dev Cluster¶

Step-13-01: Update modules/kubernetes_deployment/main.tf¶

Update Docker Image path and tag in main.tf

# Before
image = "us-central1-docker.pkg.dev/GOOGLE_CLOUD_PROJECT/myapps-repository/myapp1:COMMIT_SHA"

# Replace GOOGLE_CLOUD_PROJECT,  COMMIT_SHA
image = "us-central1-docker.pkg.dev/gcplearn9/myapps-repository/myapp1:xxxxx"

Step-13-02: Execute Terraform Commands and Verify¶

# Change Directory
cd p2-k8sresources-terraform-manifests

# Terraform Validate
terraform validate

# Terraform Plan
terraform plan

# Terraform Apply
terraform apply -auto-approve

# Verify the deployed application
http://<LOAD-BALANCER-IP>
Observation: 
1. V2 App displayed
2. Continuous Integration is working as expected
3. How to also implement continous delivery ?
4. Automatically main.tf should be updated with COMMIT_SHA and put ready for deployment
5. We will se that in next demo

Step-14: Clean-up¶

# Change Directory
cd p2-k8sresources-terraform-manifests

# Terraform Destroy
terraform apply -destroy -auto-approve