If you are rebuilding the ssh keys for a user who has accidentally destroyed their files inside .ssh directory

Step 1: Generate the Private Key

# ssh-keygen -t rsa

Step 2: Generate the Public Key from Private Key

# ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub

Step 3: Generate the Authorized Key

# cat .ssh/id_rsa.pub >> .ssh/authorized_keys

Step 4: Generate Config File

# touch ~/.ssh/config

StrictHostKeyChecking no