SSH

Generate

From ~/.ssh, write the public key from the private key:

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

-y reads the private key and prints the public key. -f id_rsa is the private key file. It will prompt for the passphrase.

Permission: 0644 for both id_rsa and id_rsa.pub.

Add

ssh-add -K <path>

-K adds the key at <path>. Permission: 400 for only self access.

Debug

-vvv is debug:

ssh -vvv