Linux Basic Command Three

One, two servers password-free login: 1. Generate Key

Ssh-keygen Command Manual, the "man Ssh-keygen" command to view the instructions:

Create a pair of keys, including the public key and the private key, from the command "ssh-keygen-t RSA" , which will generate a ". SSH" folder at the user's root directory

Go to ". SSH" To view the generated files

Authorized_keys: The public key that stores the remote password-free login, which records the public key of multiple machines mainly through this file.

ID_RSA: Generated private key file

Id_rsa.pub: Generated Public key file

Know_hosts: List of known host public keys

If you want the SSH public key to take effect, at least two of the following conditions will be met:

1). The SSH directory must have permissions of 700

2). The. ssh/authorized_keys file permission must be 600

The following methods are commonly used:

　　　2.1 By way of Ssh-copy-id

Command: Ssh-copy-id-i ~/.ssh/id_rsa.put <romte_ip>

Example:

[email protected]. ssh]# ssh-copy-id-i ~/.ssh/id_rsa.pub 132.232.138.29

[email protected]. ssh]# ssh [email protected] 132.232.138.29 connect directly to another server .

　　　　2.2 Writing content to each other's files via SCP

Command: scp-p ~/.ssh/id_rsa.pub [Email Protected]<remote_ip>:/root/.ssh/authorized_keys

SCP: that is, Ssh-copy-id

Example:

1. scp-p ~/.ssh/id_rsa.pub [email protected]:/root/.ssh/authorized_keys

2. SSH [email protected] Connect directly to another server.

Original Reference Address: http://www.cnblogs.com/LuisYang/archive/2016/10/12/5952871.html

　　　　　　　　

Linux Basic Command Three