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DevOps - Kubernetes, Cloud, AWS

Preparation

  1. Fork the repo
  2. Start a VM based on the "DevOps - Cloud" template

Docker HUB

  1. Register/login to the Docker Hub. Generate your access token
  2. Login to docker hub from the CLI
docker login --username szatmarizoltanmit
  1. Build your project as a docker image and publish it to the Docker Hub
docker build -t szatmarizoltanmit/helloworld:latest .
docker push szatmarizoltanmit/helloworld:latest

AWS

  1. Register/login to AWS. This lab fits the Free Tier usage.
  2. Get your AWS security credentials (Access key and Secret key)
  3. Generate an SSH key in EC2, if you don't have one.

Kubernetes

  1. Clone the repository to the cloud VM
  2. Enable the MicroK8S Ingress module and create the /home/cloud/db-init directory
microk8s.enable ingress dns
mkdir /home/cloud/db-init
  1. Create kubernetes volume
microk8s.kubectl apply -f volume.yml
microk8s.kubectl get pv,pvc
  1. Start the database POD and service
microk8s.kubectl apply -f db.yml
microk8s.kubectl logs -f pod/dbapp
  1. Init and test the database connection
microk8s.kubectl get all
echo "show tables;" | mysql -u root -p -h dbservice.ip.address golf
mysql -u root -p -h dbservice.ip.address gold < database/golf.sql
echo "show tables;" | mysql -u root -p -h dbservice.ip.address golf
  1. Fine-tune the DBHOST environment variable with the IP of the dbservvice and deploy your web application
microk8s.kubectl apply -f web-app.yml
curl httpservice.ip.address:8088/greeting
curl httpservice.ip.address:8088/sql
  1. Add the Ingress to the deployment
microk8s.kubectl apply -f ingress.yml
curl --insecure https://localhost/sql
  1. Map the post 443 on the cloud VM to its public interface and check the endpoint using the browser (HTTPS!)

AWS EB deployments

EB Java application manual deployment

  1. Create a new EB application and an environment
    • Select Java platform, and the default application to deploy.
    • Go for the more detailed customization and don't deploy using the default settings
    • Set your SSH key to the environment
  2. Add the environment variable SERVER_PORT=5000 to your environment
  3. Try to upload your jar file manually
  4. Check the HTTP endpoint URL /greeting

EB Java application automatic deployment

  1. Create your Job in your Jenkins to build the application
    • Add the repository
    • Add the gradle build step and define the build task for it
  2. Add a new AWS Elastic beanstalk build step to your job
  3. Define the AWS credentials using the Jenkins secure credential store
  4. Set your application and environment name on the configuration panel
  5. Define the root object as build/libs/gs-rest-service-0.1.0.jar
  6. Define the version label format as ${GIT_COMMIT}
  7. Save and test your job
  8. Check the AWS EB console, the Events and also the Application versions.

EB Docker application deployment

  1. Create a new EB application and an environment
  2. Select Docker platform, and the default application to deploy
  3. Fine-tune and upload the Dockerrun.aws.json file manually as a new deployment
  4. Check the HTTP endpoint URL /greeting
  5. Clone your Jenkins job (Create a new one based on the previos one as a template)
  6. Tune the application and environment name and Replace the root object to Dockerrun.aws.json
  7. Save and test your job
  8. Check the AWS EB console, the Events and also the Application versions.

Database connection

  1. Create an RDS database.
    • Take care on the network settings: VPC, subnets.
    • Grant access from your EB application security groups.
    • Set the root password to devops, because it is hardwired in the Java code.
  2. Define the DBHOST environment variable in your Java-based EB environment
  3. SSH to the EC2 instance of your Java-based EB environment using the ec2-user ssh username and you SSH key.
  4. Clone the repository and load the dataset to your database. If needed you may install the git and mysql-client CLI tools.
sudo yum install -y mysql-client git
  1. Test your Java-deployment using the /sql endpoint.