In the last blog post, we discussed about Amazon’s docker container image repository service, Elastic Container Registry (ECR). We learned how to create ECR, push and pull images and other basic operations. In this blog post, we’ll discuss about advanced features such as scan on push, lifecycle policies, etc. We’ll learn what these features are about, and how to turn them on or off.
Image tag Mutability
You can configure a repository to be immutable to prevent image tags from being overwritten. After the repository is configured for immutable tags, an
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ImageTagAlreadyExistsException error is returned, if you attempt to push an image with a tag that is already in the repository.
Amazon Elastic Container Registry or ECR is one of the services hosted by Amazon Web Services (AWS). ECR provides both private and public repositories for storing container images. It integrates well with AWS CLI to push, pull and manage Docker images, Open Container Initiative (OCI) images, and OCI compatible artifacts. Both public ECR and private ECR, provides almost same features. However private ECR, as the name indicates, provides more security features for enterprises as all communication needs to be authenticated first. This is a first one in series of blog posts on the Amazon ECR, where we’ll cover the basics of getting started. In later blog posts, we’ll discuss how to operate and utilize various features in ECR, cover some security and monitoring considerations and some automation as well.
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As you might have already learned, Terraform stores information about the infrastructure managed by it by using state files. By default, if we run Terraform code in a directory named /code/tf, it will record state in a file named /code/tf/terraform.tfstate file. This file contains data in JSON format which contains information about resources mentioned in the configuration files from the real-world infrastructure. Using this file, terraform knows what has been deployed and compare that to what has been mentioned in the configuration files, and come up with a plan on what needs to be changed. So its very critical that terraform is referring to correct state file, which ideally should be 1:1 mapping of real-world infrastructure.
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