Automatic SSH logon methods

Methods for automatic SSH logon 1. Automatic ssh/SCP Method =


A is a local host (that is, a machine used to control other hosts );

B is the remote host (that is, the server of the controlled machine), if the IP address is 192.168.60.110;

Both system A and system B are Linux


Run the following command on:

# Ssh-keygen-t rsa (Press enter three times in a row to generate a public key and a private key in the keystore without a password)

# SSH root@192.168.60.110 "mkdir. Ssh" (password required)

# SCP ~ /. Ssh/id_rsa.pub root@192.168.60.110:. Ssh/id_rsa.pub (password required)


Command on B:

# Touch/root/. Ssh/authorized_keys (if this file already exists, skip this one)

# Cat/root/. Ssh/id_rsa.pub>/root/. Ssh/authorized_keys (append the id_rsa.pub content to authorized_keys)


Return to machine:

# SSH root@192.168.60.110 (password not required, login successful)


2. Control n machines for Automatic Logon As described above

Then we need n pairs of keys (key and public key). The Ssh-keygen command can change the name of the key pair at will, for example:

# Ssh-keygen-T RSA

Generating public/private RSA key pair.

Enter file in which to save the key (/root/. Ssh/id_rsa):/root/. Ssh/id_rsa_192.168.60.110


In this way, the private key and public key are named id_rsa_192.168.60.110 and id_rsa_192.168.60.110.pub respectively. Then, the content of the id_rsa_192.168.60.110.pub file is appended to the content of the sever ~ In the/. Ssh/authorized_keys file, specify the local key using the-I parameter of the local SSH command, and log on:

# Ssh-I/root/. Ssh/id_rsa_192.168.60.110 someone@192.168.60.110


The same is true for SCP.

# SCP-I/root/. Ssh/id_rsa_192.168.60.110 filename:/home/someone


Add the following two lines to the file. bashrc. You do not need to input such a long command every time you perform the same operation:

Alias sshcell = 'ssh-I/root/. Ssh/id_rsa_192.168.60.110 110'

Alias scpcell = 'scp-I/root/. Ssh/id_rsa_192.168.60.110 filename someone@192.168.60.110:/home/someone'


In this way, enter the command to implement SSH and SCP Automatic Logon:

# Sshcell

# Scpcell


3. Automatic ssh/SCP script

If you need to access C from A to B, then SSH and SCP are required twice, which is troublesome.

SSH Automatic Logon:

#! /Usr/bin/CT-F

Set timeout 30

Spawn SSH weiqiong @ B

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Send "ssh weiqiong @ C \ r"

Reset CT "Password :"

Send "pppppp \ r"

Interact



SCP Copies files from A to C:

#! /Usr/bin/CT-F

Set timeout 300

Set file [lindex $ argv 0]

Spawn SCP $ file weiqiong @ B:/home/weiqiong

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Spawn SSH weiqiong @ B

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Send "SCP $ file weiqiong @ C:/home/weiqiong \ r"

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Exit

Interact


SCP Copies files from C to:

#! /Usr/bin/CT-F

Set timeout 300

Set file [lindex $ argv 0]

Spawn SSH weiqiong @ B

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Send "SCP weiqiong @ C:/home/weiqiong/$ file. \ r"

Reset CT "Password :"

Send "pppppp \ r"

CT "] *"

Send "Exit \ r"

CT "] *"

Spawn SCP weiqiong @ B:/home/weiqiong/$ file.

Reset CT "Password :"

Send "pppppp \ r"

Interact

4. Create an SSH/SCP Channel

For example, if my machine is a, the intermediate server is B, and the target server is C <br>

From A to B, from B to C, but a cannot directly SSH to C <br>

Now we will use SSH channel technology to directly transfer files from A to C <br>

1. Ssh-l1234: C: 22 userid @ B <br>

Input B's password <br>

(Port 1234 is the idle port of host a. This Command requires the root user permission on host a. In fact, a channel is established on port 1234 of the host.) <br>


2. Open a new console and type: <br>

SCP-p1234 filename userid @ localhost: <br>

Input C's password