Use ssh-keygen for password-free login to linux

Use ssh-keygen, implement password-free login to linux host 192.168.1.2 server 192.168.1.3 first generate key ssh-keygen-t rsa in the user directory of the local host and press four enter keys as prompted, the key to be used is generated. the generated file id_rsa.pub is displayed in the ssh/directory and uploaded to the root directory of the server. scp-p id_rsa.pub username@192.168.1.3 :. ssh/rename id_rsa.pub to mv id_rsa.pub authorized_keys on the server. If authorized_keys already exists on the server, now you can use cat id_rsa.put> authorized_keys to append the key we generated to the back of the authorized_keys file. Then you can change the File Permission chmod 600 authorized_keys OK now you can directly use the ssh userName@192.168.1.3 locally logged on, no Password