Password-free telnet and remote operation

Mainly: the creation and use of key pairs , to master password-free telnet and remote operation

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Environment:

Local Host 192.168.170.3

Remote host 192.168.155.3

Refer to the previous few to ensure that the local host and the remote host can ping each other

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(Principles and Procedures:

The local host 192.168.170.3 generates a key pair, then uploads the public key to the remote host 192.168.155.3, and then logs on to the remote host 192.168.155.3 the public key to the authorization key file .

Use a key pair to authenticate, so you can password-free telnet and remote operation

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1.

On putty, log in as user root 192.168.170.3

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[Email protected] root]# mkdir-pm. SSH

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Create a key pair

[Email protected] root]# ssh-keygen-f. Ssh/id_dsa-t DSA

- F is the saved file location after the key is generated

The- T parameter specifies the type of key to generate , and you specify the DSA

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To view the resulting key pair :

[Email protected] root]# cat. Ssh/id_dsa

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To view the resulting public key :

[Email protected] root]# cat. Ssh/id_dsa.pub

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2. Upload the public key to the remote host 192.168.155.3

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(First red Place, yes, then enter

The second red Place, enter the password for the remote host 192.168.155.3, and then enter

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If the remote host 192.168.155.3 adds the public key to the authorization key file, there is no need to enter the password

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3, Putty connect the remote host 192.168.155.3, add the public key to the authorization key file

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[Email protected] root]# mkdir-pm ssh

[Email protected] root]# cat id_dsa.pub >>. Ssh/authorized_keys

[Email protected] root]# chmod ssh/authorized_keys

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4, Local host 192.168.170.3 password-free telnet remote host 192.168.155.3, create file 155.txt

(Content is by170)

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[[email protected] root]# ssh [email protected]

Last Login:thu-13:12:29 from 192.168.155.1

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[Email protected] root]# cat > 155.txt

by 170

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This time password-free Telnet remote host 192.168.155.3 succeeded

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5. Local Host 192.168.170.3 remote replication 155.txt just created (remote host 192.168.155.3

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first [[email protected] root]# exit

(Exit Telnet, return to localhost 192.168.170.3)

[Email protected] root]# SCP [email protected]:155.txt. (remote copy)

[[email protected] root]# cat 155.txt (view 155.txt to see if replication succeeded)

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7. Remote operation (remote execution command)

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Local host 192.168.170.3 remote operation (remote host 192.168.155.3), execute ls-l command

(can be any command)

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[[email protected] root]# ssh [email protected] ls-l

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Password-free telnet and remote operation