I'm trying to figure out if there's a way to externalize common resources like labels or networks in Docker Compose files. Specifically, I'm wondering if I can use features like 'extends' or 'include' in a native way without relying on a wrapper script. For example, I want to define common labels in a separate file (common.yml) and use them in my service's docker-compose.yml. I also want the service name to be resolved from a .env file. So, is there a built-in way to achieve this in Docker Compose?
2 Answers
You can use YAML anchors to define common labels and reuse them across your services. This way, instead of duplicating the labels, you set them once and reference them wherever you need. It’s a neat trick in YAML!
You should definitely check out the string interpolation feature. It can help you with using variables defined in your .env file within your Docker Compose setup, but I'm not sure it covers the 'extends/include' part you mentioned. It might let you configure some variables, but common labels and resources might still need a different approach.
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