SSH

mkdir ~/.ssh chmod 700 ~/.ssh ssh-keygen -t rsa

You will be prompted for a location to save the keys, and a passphrase for the keys. This passphrase will protect your private key while it's stored on the hard drive and be required to use the keys every time you need to login to a key-based system:

Generating public/private rsa key pair. Enter file in which to save the key (/home/b/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/b/.ssh/id_rsa. Your public key has been saved in /home/b/.ssh/id_rsa.pub.

Your public key is now available as .ssh/id_rsa.pub in your home folder.

Permission problems with SSH

Ssh is very picky about permissions on the ~/.ssh directory and files. Sometimes you may do something to mess up these permissions. Run the following to fix most permissions problems. You may have to do this on both the remote host and local host.

chmod 700 ~/.ssh 

chmod 600 ~/.ssh/id_rsa 

chmod 644 ~/.ssh/id_rsa.pub 

chmod 644 ~/.ssh/authorized_keys 

chmod 644 ~/.ssh/known_hosts


Also no directory above ~/.ssh can have 'group' or 'other' write permissions.