SSH with Public/Private Keys

On Your MAC/LINUX CLIENT PC

mkdir -p ~/.ssh
chmod 700 ~/.ssh
# ssh-keygen produces two files. An empty pass phrase private key, 'piuser_rsa' and the public key 'piuser_rsa.pub'
ssh-keygen -b 4096 -t rsa -N '' -f .ssh/piuser_rsa
touch ~/.ssh/config
# Edit the ssh config file
vi ~/.ssh/config
# Insert a CONFIG entry in config for your particular server and save

Host controller pi0 pimanager

     HostName 192.168.1.81

     Port 22

     User pi

     IdentityFile ~/.ssh/piuser_rsa

Once completed (on server setup) - we can now ssh into the Pi server (192.168.1.81)with the command 'ssh pi0' or 'ssh pimanager'  instead of ssh pi@192.168.1.81 -i .ssh/piuser_rsa

On Your Server Raspberry Pi (eg. 192.168.1.125)

mkdir -p ~/.ssh
touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
chmod 700 ~/.ssh
vi ~/.ssh/authorized_keys

# Insert your Client's PUBLIC KEY (eg. 'piuser_rsa.pub') AT THE END OF THE 'authorized_keys' FILE AND SAVE

Debugging SSH daemon


Edit file /etc/ssh/sshd_config

# Logging

SyslogFacility AUTH

LogLevel DEBUG

Peek at logs on Daemon 

tail -lf /var/log/auth.log 

Debugging SSH client


ssh -vvvv pi@192.168.1.81