Container images are referneced with a multi-part URL:
- [login url] / [namespace] / [repo] : [tag]
- [namespace] / [repo] : [tag ] are equally referred to as an "image"
Different clouds implement the unique login url in a few different forms, while effectively meaning the same thing:
| Cloud | Format | eg: image |
|---|---|---|
| Docker Hub | [org|user ] / [image] : [tag] *1 | contoso/marketing-fall2018-web:aab1 |
| Azure Container Registry (acr) | [uniqueId].azurecr.io / [namespace] / [image] : [tag] | contoso.azurecr.io/marketing/fall2018/web:aab1 |
| Google Container Registry (gcr) | gcr.io/[uniqueId] / [image] : [tag] | gcr.io/marketing/fall2018-web:aab1 |
| AWS Container Registry (ecr) | [aws_account_id].dkr.ecr.region.amazonaws.com/ [image] : [tag] | 123abc456def.dkr.ecr.region.amazonaws.com/marketing/fall2018-web:aab1 |
- Docker Hub has a default login url docker.io
- Docker Hub [org|user ] is a [namespace] which is currently limted to two nodes.
The Microsoft Container Registry (mcr) has implemented a syndicated catalog representing a product hierarchy within the docker store, and looks for Docker to expand this for other partners with deep image catalogs.
Proposal aligns Helm Charts with the same referencing scheme:
- [login url] / [namespace] / [chart] : [version/tag]