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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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