Hostname false positive

[steelbrain]

Context

• node version: v6.1.0
• joi version: v8.1.1
• environment (node, browser): node
• used with (hapi, standalone, ...): Not sure, horizon uses this and I am using horizon

More info in the horizon bug, rethinkdb/horizon#545

[Marsup]

That would be a wontfix. It's acting according to RFC afaik.

1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
   to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
   sign (-), and period (.).

[steelbrain]

Well the ping to that hostname in Linux and OSX works (not tested in Windows), it works when accessed from Node.js net APIs, I think that's because it's allowed

[Marsup]

That's a validation of an RFC, if operating systems don't respect that maybe you need to use your own regex.

[steelbrain]

I suppose you have a point

[augnin]

there are many similar issues related to docker-compose where people have complained about similar validation failures on other platforms

docker/compose#472
docker/compose#229

FYI docker-compose links containers with an alias <project_name>_<service_name>_<instance_num> and creates entries in container's /etc/hosts file similar to:

172.17.0.3  <service_name> <container_id> <project_name>_<service_name>_<instance_num>
172.17.0.3  <service_name>_<instance_num> <container_id> <project_name>_<service_name>_<instance_num>
172.17.0.3  <project_name>_<service_name>_<instance_num> <container_id> 

in which case you'll be able to connect to your linked service using any of the following host names:

1. <service_name>
2. <service_name>_<instance_num>
3. <project_name>_<service_name>_<instance_num>

Your hostname validation would fail in case you use 2 or 3 in any case. 1 would fail if your service name as defined in docker-compose.yml contains an underscore.

you may want to refer to https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/#updating-the-etc-hosts-file

[steelbrain]

@sybt I fixed it by specifying hostname in docker-compose instead of letting it automatically choose one