In your ssh config is it possible to have one host entry for multiple machines on the same domain

I'd like to be able to do something like

Host *
    HostName *.mydomain.com
    ...

So I can type something like

ssh test
ssh ci
ssh dev

Instead of having to type

ssh test.mydomain.com
ssh ci.mydomain.com
ssh dev.mydomain.com

Right now I have separate entries for each one, but we have dozens of machines, so I'd rather have a default rather than have to duplicate everything so many times.

Answer

Instead of doing this with ssh, use the /etc/resolv.conf file

Add a line saying

search mydomain.com

What this does is wherever you don't enter a full domain name, it will use this suffix to work out the full name, effectively appending .mydomain.com to ci when you do ssh ci.