Expect non-interactive features of Linux

In my last blog post , SSH key authentication for Linux has been used to authenticate each other, but each time I use SSH to log on to another server or enter a password.

Expect is a tool that provides automatic interaction, automatically connects to managed servers, and does not require a password to be entered manually.

1, installation expect

[email protected] ~]# Yum install-y expect

2, write expect script, direct distribution SSH public key, do not enter the password manually.

Vim/server/scripts/expect.exp

1#!/usr/bin/expect2 3#-------------CopyRight-------------4 # name:ssh Send password5# Version Number:1.00  6 # Type:sh7 # Language:expect8# Date:2018- to- -  9 # Author:sandyTen# QQ:442656067 One# Email:[email Protected]163. com A# Blog:https://www.cnblogs.com/eeexu123/ -  - if{$ARGC! =2 } { theSend_user"usage:expect fenfa_expect file host\n"//Determine if the incoming parameter is 2 -Exit1 - } -  + #defineVar - Setfile [lindex $argv0]//The first parameter is an SSH public key + SetHost [lindex $ARGV1]//The second parameter is the remote host address of the connection A Setpasswd"Herine"//Set the password for the connecting user at  -  - #send ssh Key -Spawn Ssh-copy-id-i $file"- p [email protected] $host"//Send SSH public key command - Expect { -   "yes/no"{Send"yes\r"Exp_continue}//whether to continue the connection, expect interactive function, add Yes automatically, and continue. Yes after must add \ r return character - } to  +Sleep3//Waiting to connect to the remote host -Expect"*password"//Enter password, expect interactive function, add password variable automatically. Back add \ r return character theSend"$passwd \ r" * expect EOF $ Panax NotoginsengExit-OnExit { -Send_user"goodbye!\n"//Exit the}

3. Testing

/usr/bin/expect test_expect.exp ~/.ssh/id_dsa.pub 172.16.1.72
The above command can be placed in the script, a large number of SSH key connection

1 [email protected] scripts]#/usr/bin/expect test_expect.exp ~/.ssh/id_dsa.pub 172.16. 1.72 2Spawn Ssh-copy-id-i/root/.ssh/id_dsa.pub-p A[Email protected]172.16.1.723The authenticity of host'172.16.1.72 (172.16.1.72)'Can't be established.4RSA Key Fingerprint isA5: -:D 4: the: $: -: -: aa: About: 8d:f0:ce:98: 5a:d3:f4.5Is you sure-want toContinueConnecting (yes/no)?Yes6Warning:permanently added'172.16.1.72'(RSA) to the list of known hosts.7[Email protected]172.16.1.72's Password:8NowTryLogging into the machine, with"ssh '-p [email protected] '", and checkinch:9 Ten. ssh/Authorized_keys One  ATo make sure we haven'T added extra keys that you weren'T expecting. -  -goodbye!

SSH Remote use command

 1 [[email protected] scripts]# ssh [email protected]172.16. 1.72 "/sbin/ifconfig eth1" 2eth1 Link encap:ethernet HWaddrxx: 0C: in: 8D: $: the  3inet Addr:172.16.1.72Bcast:172.16.1.255Mask:255.255.255.04Inet6 addr:fe80::20c:29ff:fe8d:6592/ -Scope:link5Up broadcast RUNNING multicast MTU: theMetric:16RX Packets:560Errors0Dropped0Overruns:0Frame07TX Packets:218Errors0Dropped0Overruns:0Carrier08Collisions:0Txqueuelen: + 9RX bytes:72275(70.5KiB) TX Bytes:39742(38.8KiB)

By on can, the expect interactive function succeeds in SSH password-free operation.

Expect non-interactive features of Linux