Docker Deployment

Developing your Docker Image Locally

Every time you make changes to any part of your Docker files (e.g., Dockerfile, app.py, requirements.txt), you need to build a new Docker image. Run the following command. Note that my-local-docker-image is the image name in the example but you should provide a more meaningful name.
```
docker build ./ -t my-local-docker-image
```

Hint

Try running the command docker images to see the images you have in your local environment.

To run your newly built Docker container, run the command:
```
docker run my-local-docker-image
```

If you need to interact with your container directly, run a command like:

```{bash}
docker run -it --entrypoint=/bin/bash my-local-docker-image
```

Once you are satisfied with local testing, then you may want to push that image to an external repository like ECR.

Run the command to make a new repo in the elastic container registry to store your new containers. The repository name, in the example my-docker-repo, needs to specified in a few places.

aws ecr create-repository --repository-name my-docker-repo

Run the commands to grab info on your AWS account and region.

aws_region=$(aws configure get region)
aws_account_id=$(aws sts get-caller-identity --query 'Account' --output text)

Run the following command to configure your authentication to talk to the ECR service. Note how we use BASH variable with the $ so that you don’t have to manually enter your region or account id.
```
aws ecr get-login-password \
--region $aws_region \
| docker login \
--username AWS \
--password-stdin $aws_account_id.dkr.ecr.$aws_region.amazonaws.com
```
Tag the image in the ECR registry by running the command. The final my-docker-repo is referring to the new repository you just built a few commands ago. The my-local-docker-image is the tag in your local Docker environment for the image you want to push.
```
docker tag my-local-docker-image $aws_account_id.dkr.ecr.$aws_region.amazonaws.com/my-docker-repo
```

Push the image to docker by running the command

docker push $aws_account_id.dkr.ecr.$aws_region.amazonaws.com/my-docker-repo

Read more about pushing a Docker image to ECR here.