Proposal: Make it possible to use "_" in container name

[skolodyazhnyy]

Hi,

Is it possible to allow some word separator in service names? For example I have a service, it's database and database volume containers. These services have names: service, servicedatabase and servicedatabasedata. You can easily identify that servicedatabase belongs to service, as it has prefix. But because neither '_' nor '-' are allowed these names are super hard to read quickly. So, it will be great if you will allow underscores, so my containers will become: service, service_database and service_database_data

If underscores will be allowed you still will be able to split joined name back to project-name, service-name and instance-number. You can forbid underscore in project name and last part is always an integer, so to split it back you need to cut part before first _ and after last _, these will be project name and instance number the rest is service name.

Thanks a lot!

[skolodyazhnyy]

PS. myproject_serviceDatabaseData_1 looks extremely ugly, it should be either snake_case or camelCase, but not both at the same time.

[aanand]

Hmm. I see the argument, but I'm wary of making the logic more complicated - it's already an ugly hack.

Once Docker has queryable container metadata (moby/moby#9882), we can relax naming rules a lot more without fear of breaking stuff.

[skolodyazhnyy]

Sounds like a plan, thanks for your answer

[aanand]

See #1519