Linux SCP password-free login and copy files

A server address: 192.168.1.200, hereinafter referred to as A 

B server address: 192.168.1.201, hereinafter referred to as B

1. Generate a key pair in A:

ssh-keygen -t rsa -P ""

2. Copy A's public key (id_rsa.pub) to B

Here is an example of copying to the root user home directory of B:

3. Login B

Copy the id_rsa.pub content of A to the authorized_keys file in the .ssh directory

cd /root
cat id_rsa.pub >> .ssh/authorized_keys

4. At this time, if you log in to B with SSH in A or copy files to B, you will not need a password.

ssh [email protected]
scp abc.txt [email protected]:/root

 To realize B password-free login to A, the operation method is the same. In B, use ssh-keygen to generate an ssh key pair, copy the public key to A, and A copies B's public key to the authorized_keys file in the .ssh directory. That's it.