How to configure ssh to log in to a remote host without entering a password
This article is about how to configure ssh to log in to remote hosts without entering a password. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.
Environment:
Local host: ha01
Eth0: 192.168.1.100 / / external IP address
Remote host: ha02
Eth0: 192.168.1.200 / / external IP address
Local host ha01 configuration:
The code is as follows:
[root@ha01 /] # cd / etc/ssh
[root@ha01 ssh] # ssh-keygen-t rsa-N "" (this step generates a key public-private key pair, where-N "" indicates that the key pair phrase is empty)
Generating public/private rsa key pair.
Enter file in which to save the key (/ root/.ssh/id_rsa):
Your identification has been saved in / root/.ssh/id_rsa.
Your public key has been saved in / root/.ssh/id_rsa.pub.
The key fingerprint is:
82:2c:74:43:8e:16:f4:ef:ac:91:0f:d7:6f:a6:f3:59 root@ha01
Copy the public key to the remote host (original method):
If the / root/.ssh/authorized_keys file does not exist on the ha02 server
The code is as follows:
[root@ha01 ssh] # scp / root/.ssh/id_rsa.pub root@192.168.1.200:/root/.ssh/authorized_keys
If the authorized_keys file exists
Execute on ha01:
The code is as follows:
[root@ha01 ssh] # scp / root/.ssh/id_rsa.pub root@192.168.1.200:/root/.ssh/
Execute on ha02:
The code is as follows:
[root@ha02 /] # cat / root/.ssh/id_rsa.pub > > / root/.ssh/authorized_keys
Copy the public key to the remote host (new method):
You can use ssh-copy-id to copy public keys to remote hosts conveniently and securely
Execute on ha01:
The code is as follows:
[root@ha01 ssh] # ssh-copy-id-I ~ / .ssh/id_rsa.pub root@192.168.1.200
SSH login test:
The code is as follows:
[root@ha01 ssh] # ssh ha02
Last login: Fri Apr 8 10:41:28 2011 from ha01
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