ssh notes

SSH

Use OpenSSH with legacy SSH implementation

if:

Unable to negotiate with 127.0.0.1: no matching key exchange method found.
Their offer: diffie-hellman-group1-sha1

Do:

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 user@127.0.0.1

or:

add this to ~/.ssh/config:

Host somehost.example.org
	KexAlgorithms +diffie-hellman-group1-sha1

See also: this article

SSH Tunneling

ssh -L <remote_port>:localhost:<local_port> user@host

e.g.,

ssh -L 5984:localhost:5984 -i /path/to/key ubuntu@ip

Derive public key from a private key

 ssh-keygen -y -f ~/.ssh/id_rsa_pts