Chapter 7.2 App Deployment on EC2 - Deploy Docker Image on EC2

Lets start by installing Docker

sudo dnf update -y
sudo dnf install -y docker

Once Installed, Run docker

sudo systemctl start docker

Make it Start Automatically, Enable Docker

sudo systemctl enable docker

(optional)Configure to let users use docker instead of just Superuser

check your identity using command whoami

now give docker permission to yourself so you wont have to touch it with root user everytime

sudo usermod -aG docker <whichever user you are in above pic>

after this restart the ssm session and run a new ssm session

and this time you should be able to run command without using root user now we can continue with our setup

Here we are at a special Junction. we have to make a architectural choice

Kafka: Inside Docker vs Outside Docker

Factor	Kafka inside Docker	Kafka outside Docker
Installation	Only Docker needed	Kafka installed on EC2
Networking	Simple: kafka:9092	More configuration required
Deployment	docker compose up	Kafka managed separately
Reproducibility	🟢 High	🟡 Medium
EC2 cleanliness	🟢 Clean	🟡 Kafka files/processes on EC2
BigKart fit	🟢 Recommended	🟡 Good
Production AWS	Usually managed Kafka (MSK)	Usually managed Kafka (MSK)

Our choice

Kafka inside Docker

EC2
└── Docker Compose
     ├── bigkart_admin
     ├── bigkart_customer
     └── kafka

why? because we want easy manageability of everything using docker for this we made 1 change in our app's application.properties file.

Whats Docker Compose

its a plugin of docker which reduces the managability of handling multiple docker images, eg one for admin, one for customer and one for kafka. we can simply write our configuration of all apps inside the docker-compose.yml file and thats it. Install docker compose easily by these commands

sudo mkdir -p /usr/local/lib/docker/cli-plugins

sudo curl -SL https://github.com/docker/compose/releases/download/v5.5.0/docker-compose-linux-x86_64 \
  -o /usr/local/lib/docker/cli-plugins/docker-compose

sudo chmod +x /usr/local/lib/docker/cli-plugins/docker-compose
docker compose version

next you can start setting up project since everything is installed in EC2 Machine