Working with EC2 Instances, Linux and Docker in AWS
In this lab I will get up and running with Docker on Linux using an AWS virtual machine. I will work with images from the public Docker registry, run a handful of containers, and create my own image from which to create containers. Then I will connect to the Flask app running as a container using the instances public IP address.
- Install Docker on Linux using an AWS virtual machine
- Find and use images from the public Docker Registry
- Build your own images using Dockerfile
- AWS account
- Create and connect to an EC2 instance using the Instance Connect.
- Install Docker using yum (assume the su role):
yum -y install docker
Then start the docker as a service:
systemctl start docker
Verify if it’s running:
- Get the first container by running:
docker run hello-world
- Try to run something more complex, like a nginx web server:
docker run --name web-server -d -p 8080:80 nginx:1.12
Then verify that web-server is responding:
- To list all running and stopped containers run_
docker ps -a
- To stop the nginx server enter:
docker stop web-server
- Search for an image that you don’t know the exact name of, say an image for Microsoft .NET Core, by entering:
docker search "Microsoft .NET Core"
This will help you find container images in the future.
- Install Git:
yum -y install git
- Clone the code repository to your virtual machine:
git clone https://github.com/cloudacademy/flask-content-advisor.git
Continue to the apps directory
Create and star editing a Dockerfile:
and type in following:
# Python v3 base layer FROM python:3 # Set the working directory in the image's file system WORKDIR /usr/src/app # Copy everything in the host working directory to the container's directory COPY . . # Install code dependencies in requirements.txt RUN pip install --no-cache-dir -r requirements.txt # Indicate that the server will be listening on port 5000 EXPOSE 5000 # Set the default command to run the app CMD [ "python", "./src/app.py" ]
then escape and save using :wq.
- Build the image from the Dockerfile:
docker build -t flask-content-advisor:latest .
- Run following command to get the public IP address:
curl ipecho.net/plain; echo
- Now you can run a container using the image you just built:
- Paste the public IP address into web browsers tab you should get response from flask app: