Version in "././infrastructure/docker/build/docker-compose.yml" is unsupported

[zrhoffman]

This Bug Report affects these Traffic Control components:

• Traffic Control Cache Config (t3c, formerly ORT)
• Traffic Control Health Client (t3c-health-client)
• Traffic Monitor
• Traffic Ops
• Traffic Portal
• Documentation
• CDN in a Box
• Automation

What did you do?

./pkg -v cache-config_build

What did you expect to happen?

cache-config successfully builds.

What actually happened?

+ ./pkg -v cache-config_build
Version in "././infrastructure/docker/build/docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version ("2.0", "2.1", "3.0") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/
Building cache-config_build.
Version in "././infrastructure/docker/build/docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version ("2.0", "2.1", "3.0") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/
Failed to build cache-config_build.

Reason:
The version key in docker-compose.yml has been deprecated for awhile now, but now using it with compose file version 3.8 is explicitly an error. The version key should be removed completely. And, to ensure that only recent docker compose versions are used, which ensures that they will support this change, instances of docker-compose should be changed to docker compose.

If an old docker-compose version is used with the version key removed from the compose file, it will complain about unknown keys in the compose file, because it will assume that compose file version 1 is used.

[Solarisbf]

which version of docker-compose ?

I solved to this problem by using old docker-compose version.

i am using docker-compose version 1.28.2

new version command is changed like this docker compose .... does not work on cdn-in-a-box