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Docker image to handle creation and renewal of Let's Encrypt certs on AWS Certificate Manager

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Certbot for AWS Cert Manager

This image enables you to create/renew Let's Encrypt SSL certificates using dns challenge for AWS Route53 and then automatically create or update them on AWS Certificate Manager.

The following environment variables should be provided:

  • DRYRUN - Runs only certbot in --dry-run mode; useful for not exceedng rate limits when debugging;
  • DOMAIN_NAME - The domain you want the certificate for;
  • CONTACT_EMAIL - the contact-email you'll want to associate to the certificate;
  • AWS_DEFAULT_REGION - the aws region you want to deploy your certificate;
  • AWS_ACCESS_KEY_ID - your AWS Key - used to deploy DNS Challenges on Route 53 as well as to send certificates to Cert Manager;
  • AWS_SECRET_ACCESS_KEY - Your AWS access key;
  • CERT_ARN - When updating an existing certificate, you must provide the arn for the existing resource on AWS Certificate Manager.
  • AWS_CONTAINER_CREDENTIALS_RELATIVE_URI can be passed to the container to avoid having to use key/secret - it works for AWS Environments ECS/CodeBuild.

Use cases

Even though we're showing docker-compose commands, the image can be handled with the docker command as well.

Dry run - testing certbot

DRYRUN=true \
  DOMAIN_NAME=sub.example.com \
  [email protected] \
  AWS_DEFAULT_REGION=us-east-2 \
  AWS_ACCESS_KEY_ID=34TG5YH56J5 \
  AWS_SECRET_ACCESS_KEY=I3RF92MRCIUENV0WUER0UWEV0WEBVW \
    docker-compose run certbot && \
    docker-compose rm -f

New certificate

DOMAIN_NAME=sub.example.com \
  [email protected] \
  AWS_DEFAULT_REGION=us-east-2 \
  AWS_ACCESS_KEY_ID=34TG5YH56J5 \
  AWS_SECRET_ACCESS_KEY=I3RF92MRCIUENV0WUER0UWEV0WEBVW \
    docker-compose run certbot && \
    docker-compose rm -f

Renew existing certificate

DOMAIN_NAME=sub.example.com \
  [email protected] \
  AWS_DEFAULT_REGION=us-east-2 \
  AWS_ACCESS_KEY_ID=34TG5YH56J5 \
  AWS_SECRET_ACCESS_KEY=I3RF92MRCIUENV0WUER0UWEV0WEBVW \
  CERT_ARN=arn:aws:acm:us-east-2:123123:certificate/123-cccc-3333-1111-3a3a3a3a \
    docker-compose run certbot && \
    docker-compose rm -f

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Docker image to handle creation and renewal of Let's Encrypt certs on AWS Certificate Manager

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