Centos 7 SSH without password

demand

I use CENTOS7 develop debugging, so regular application deployment and maintenance connected to the server via SSH.
So, there is an urgent need for a way to password-free log in to the cloud server, and available everywhere.

Program

The use of "public private" way to authenticate ssh login

principle

1. RSA creates a pair of public and private key on the client (public key file: ~ / .ssh / id_rsa.pub; private key file: ~ / .ssh / id_rsa)

2. The public key to the server (~ / .ssh / authorized_keys), retained their own private good

3. When ssh login, ssh program will send a public key and a private key on the server to do the match, if the match is successful login is successful

 

(1) for generating a public and private key RSA

Then, move the mouse in the blank area free, puttygen.exe generates a random number when the mouse is used to generate the RSA public and private key.

 Generated in the previous step Copy all Public Key, then placed server ~ / .ssh / authorized_keys file, a Public Key own line, as shown below:

mkdir -p /root/.ssh -p
cd /root/.ssh
vi authorized_keys

 

Click puttygen.exe of the Save Private Key , RSA private key will be saved as a file