error

$ ssh hostname -l username
Unable to negotiate with <IP address> port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss

workaround

ssh -oHostKeyAlgorithms=+ssh-dss hostname -l username

When setting up password less authentication via ssh, use ssh-copy-id to copy the public key to the remote machine.

The command looks like

ssh-copy-id user@host

When you run it the first time, it will ask for password and then copies the key to the remote machine. It is very convenient!

Ref:

• man page - https://linux.die.net/man/1/ssh-copy-id

• https://linuxize.com/post/using-the-ssh-config-file/ - Using the SSH config file
  • Well written; easy to follow; high information density; non-trivial examples

• ssh without password
• You can create nicknames for logging into remote servers in ~/.ssh/config and can use them with ssh, rsync, scp etc., - https://www.saltycrane.com/blog/2008/11/creating-remote-server-nicknames-sshconfig/