coltonbh/two_hop_ssh.md

## two_hop_ssh.md

      
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              two_hop_ssh.md
            
          
Create new ssh key

Change to ssh directory
cd ~/.ssh/
Create a new key. Give it a useful name (you are prompted for a name after you hit enter; leave passphrase blank)
ssh-keygen -t ed25519 -C "your_email@example.com"
or if no Ed25519 algo:
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

Copy key to server

ssh-copy-id -i ~/.ssh/my_key.pub username@ip_address_of_server

Update ~/.ssh/config file

Host first-hop
  HostName login-node-dns-or-ip
  User username
  IdentityFile ~/.ssh/my_key
  IdentitiesOnly yes
  ForwardAgent yes

Host second-hop
  HostName second-hostname-or-ip
  User username
  IdentityFile ~/.ssh/my_key
  ProxyCommand ssh first-hop -W %h:%p

If needed chomd the newly created key to 600

chmod 600 my_key_name