Just another data point - I use nix + home-manager and have a bunch of servers set up like this; programs.ssh = { enable = true; forwardAgent = true;

Just another data point - I use nix + home-manager and have a bunch of servers set up like this; programs.ssh = { enable = true; forwardAgent = true; extraConfig = '' Host server-one HostName 123.0.0.1 Port 22 User root IdentityFile ~/.ssh/some_rsa Host server-two HostName 123.0.0.2 Port 22 User root IdentityFile ~/.ssh/other_rsa ''; };