DevOps Challenge

Project Scope

• Provisioned via Terraform(K3s)
• All setup and management steps are versioned in a single Git repository.
• All passwords and sensitive information are stored as Kubernetes Secrets.
• PostgreSQL and Redis are installed and configured via Helm Charts.
• Jenkins is used for building and deploying applications.
• Data persistence and daily backups are configured for PostgreSQL.
• Redis is available for caching.
• Everything is installable and testable via provided CLI scripts.

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Installation

1. Requirements

• Ubuntu 22.04+ (clean virtual machine)
• curl, redis-cli, psql, git, kubectl, helm, terraform
• DockerHub account (for the example app)

2. Quick Start

1. Clone the repository:

git clone https://github.com/yunusemretosun/devops-challenge.git
cd devops-case

2. Setup environment and dependencies:

bash scripts/setup_environment.sh

3. Deploy Jenkins, PostgreSQL and Redis

# Install Jenkins
helm upgrade --install jenkins jenkins/jenkins \
  --namespace jenkins \
  --create-namespace \
  -f helm-charts/jenkins/values.yaml \
  --wait --timeout 3m

#required roles for deployment all namespaces
kubectl apply -f helm-charts/jenkins/roles.yaml

#Get Jenkins UI credentials
kubectl exec --namespace jenkins -it svc/jenkins -c jenkins -- /bin/cat /run/secrets/additional/chart-admin-password && echo

#Access Jenkins UI
echo "http://$(hostname -I | awk '{print $1}'):30080"

3.1 Install PostgreSQL and Redis with Jenkinsfile.infra (Secure way)

Before running the pipeline, create these credentials in Jenkins as shown below:

Then, create a new pipeline using Jenkinsfile.infra and start the build.

3.2 Install PostgreSQL and Redis Manually

# Create namespaces
kubectl create ns postgresql
kubectl create ns redis
# Create secrets (replace <changeme> with secure passwords)
kubectl create secret generic my-postgres-secret \
  --from-literal=postgres-password=<changeme> \
  --from-literal=password=<changeme> \
  -n postgresql

kubectl create secret generic redis-secret \
  --from-literal=redis-password=<changeme> \
  -n redis
	
# Install PostgreSQL
helm upgrade --install postgresql bitnami/postgresql \
  -n postgresql -f helm-charts/postgresql/values.yaml
	
# Install Redis
helm upgrade --install redis bitnami/redis \
  -n redis -f helm-charts/redis/values.yaml

3. Testing

#Postgresql test
bash scripts/postgre_test.sh

#Redis Test
bash scripts/redis_test.sh