The app manager can be used to download and prepare an application to be installed onto a secured, air gapped Kubernetes cluster. When doing this, there are a few additional steps and configuration needed.
Docker Image Registry Requirements
To install an application into an air gapped network, you must have a docker image registry that is available inside the network.
The app manager rewrites the application image names in all application manifests to read from the on-prem registry, and it retags and pushes the images to the on-prem registry.
When authenticating to the registry, credentials with
push permissions are required.
A single application expects to use a single “namespace” in the docker image registry.
The namespace name can be any valid URL-safe string, supplied at installation time. Keep in mind that a registry typically expects the namespace to exist before any images can be pushed into it.
Note: ECR does not use namespaces.
Docker Image Registry Compatibility
The app manager has been tested for compatibility with the following registries:
Note: To avoid the November 20, 2020 Docker Hub rate limits, use the
kots docker ensure-secretCLI command. For more information, see Avoiding Docker Hub rate limits.
Amazon Elastic Container Registry (ECR)
Google Container Registry (GCR)