I like to puts my server shortcut into ~/.ssh/config to custom thing such as username or port so I can do

ssh mx1

which will become

ssh -p 9222 root@mx1.hanami.run

But adding config directly into ~/.ssh/config get messup very quickly when I started to have more projects and more server. One nice way is to cleanup this mess is to use Include direction.

Instead of this:

# In file ~/.ssh/config
Host db1
  Hostname 10.1.1.2
  User db
  IdentityFile ~/.ssh/db
Host db2
  Hostname 10.1.1.2
  User db
  IdentityFile ~/.ssh/db

do this:

# In file ~/.ssh/config
Include ~/Sites/hanami/config/ssh/config
# Other config

Then in file ~/Sites/hanami/config/ssh/config I can put these:

Host db1
  Hostname 10.1.1.2
  User db
  IdentityFile ~/.ssh/db
Host db2
  Hostname 10.1.1.2
  User db
  IdentityFile ~/.ssh/db

The cooling about this is I can tell my team to put that single Include instruction and everyone will share the same SSH config.

Note that Include has to be put at the top of ~/.ssh/config file.