Host m-server
  HostName m-server.home.lan
 
Host rpi5
  HostName rpi5.home.lan

Host rack
  HostName rack.home.lan

Host amd
  HostName amd.home.lan
  
Host nas
  HostName nas.home.lan
  User admin

Host *
    User jd
    IdentityFile ~/.ssh/id_rsa
    StrictHostKeyChecking no