Automated configuration ssh connection

Automated configuration ssh connection

When other host connection from the host using ssh often require a number of different response information.

For example, when the first visit:

#ssh root@localhost
The authenticity of host 'localhost (::1)' can't be established.
ECDSA key fingerprint is 03:cc:13:fe:6c:85:0a:af:df:67:de:18:19:ae:d8:1f.
Are you sure you want to continue connecting (yes/no)?

You enter yesthe next step you will find under the following output:

root@localhost's password: 

At this point it asks you to enter the root password. After you enter the correct password, you can see the following output:

Last login: Tue Jun 14 20:45:07 2016 from 192.168.12.1
[root@LINUXTEST ~]# 

If we want to achieve ssh automatic operation, and perform an operation on a remote host, such as:

root@LINUXTEST .ssh]# ssh root@localhost hostname 
The authenticity of host 'localhost (::1)' can't be established.
ECDSA key fingerprint is 03:cc:13:fe:6c:85:0a:af:df:67:de:18:19:ae:d8:1f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
root@localhost's password: 
LINUXTEST

In this process, you need to enter yes, passwordthese two values.

Here alone shellitself is not complete, we need a expecttool to help us.

• installationexpect

  #yum install expect -y
  
  Installed:
      expect.x86_64 0:5.45-14.el7_1
  
  Dependency Installed:
      tcl.x86_64 1:8.5.13-8.el7
  
  Complete!
  

• Create the following scriptautossh.sh

  # vi autossh.sh
      #!/usr/bin/expect
      set ipaddr "localhost"
      set password "root1234"
  
      spawn ssh root@$ipaddr
      expect {
      "yes/no" { send "yes\r";exp_continue }
      "password:" { send "\r" }
      }
      expect "]#"
      send "pwd;hostname \r"
      expect eof
      exit
  # chmod u+x autossh.sh 
  

• Execute this script, we get the following output

  # ./autossh.sh 
  spawn ssh root@localhost
  The authenticity of host 'localhost (::1)' can't be established.
  ECDSA key fingerprint is 03:cc:13:fe:6c:85:0a:af:df:67:de:18:19:ae:d8:1f.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
  root@localhost's password: 
  Last login: Tue Jun 14 20:56:38 2016 from 192.168.12.1
  [root@LINUXTEST ~]# pwd;hostname 
  /root
  LINUXTEST
  

• Next we all just need to create a user name and password hosts file h-u-p.txt, which contains the following elements

  #vi h-u-p.txt
  hostname1:username1:password1
  hostname2:username2:password2
  hostname4:username3:password3
  hostname4:username4:password4
  .......
  

• Write another script batchssh.shto handle these parameters and callsautossh.sh

  #vi batchssh.sh
      #!/usr/bin/bash
  
      for line in $(cat h-u-p.txt)
              do
              arr=(${line//:/ })
              ./autossh.sh ${arr[0]} ${arr[1]} ${arr[2]}
      done
  

• Modified autossh.shto

      #>autossh.sh
      #vi autossh.sh
          #!/usr/bin/expect
          set ipaddr [lindex $argv 0]
          set username [lindex $argv 1]
          set password [lindex $argv 2]
  
          spawn ssh $username@$ipaddr
          expect {
          "yes/no" { send "yes\r";exp_continue }
          "password:" { send "$password\r" }
          }
          expect "]#"
          send "pwd;hostname;exit \r"
          expect eof
          exit
  

• So now you can edit the file h-u-p.txtto the batch execution ssh connection. Files are listed below:

  autossh.sh  batchssh.sh  h-u-p.txt