I want to execute the command remotely

prakash0106 · 08-03-2018, 01:35 AM

my test is I have server name with different domain name :
example: test.server.com and test.servera.com, test.serverb.com

I want to execute the command remotely with help of expect and spawn

#!/usr/local/bin/expect -f
spawn ssh username@test.server.com
if(not reachable){
spawn ssh username@test.servera.com
}else{
echo "it failed\r"
}

Turbocapitalist · 08-03-2018, 01:59 AM

Quote:

Originally Posted by prakash0106

I want to execute the command remotely ...

You're probably better starting a new thread then. But to get you started, there are several ways:

Code:

#!/bin/sh

ssh -i /home/prakash/.ssh/servera_key_rsa username@test.servera.com "uname -nrs;" \
|| ssh -i /home/prakash/.ssh/serverb_key_rsa username@test.serverb.com "uname -nrs;"

if [ $? -eq 0 ]; then 
        echo It Worked; 
else 
        echo Did Not Work; 
fi

Please explain more of what you are trying to do. Using expect is almost certainly barking up the wrong tree.

prakash0106 · 08-03-2018, 02:17 AM

really sorry for posting the help on this post. I havnt time to open a new post query.

I have list of servers with 2 different domain name.

pp1.servera.com
pp1.serverb.com

pp2.servera.com
pp2.serverb.com

......

single host with 2 different domain alias names for R&D purpose

now im trying to execute the remote command for file modification with help of expect and spawn

in my environment sometimes pp1.servera.com will login and pinging so no issues for executing the scripts with x.servera.com but sometimes pp1.servera.com not reachable and pp1.serverb.com will reaching. so I cant able to execute the script. here my script below

this script is working only for one suffix domain.

I want to run this script, if x.servera.com not reachable then try x.serverb.com

I have 5k servers with 2 domain alias.

my host list file have the below content
pp1
pp2
pp3
pp4
pp5

those servers have 2 domain alias for R&D purpose

.servera.com
.serverb.com

help me

jlinkels · 08-03-2018, 04:43 AM

Quote:

Originally Posted by prakash0106

really sorry for posting the help on this post. I havnt time to open a new post query.

Maybe not, but for the same you expect us to have the time to solve your problem. Do you think that is reasonable?

You were told a hint for a solution. Did you implement it? And where did it go wrong? And where are you stuck now?

We are not a bureau you submit your wish and get a scripted solution delivered. We are happy to help if you get stuck. But not to do your work.

jlinkels

prakash0106 · 08-03-2018, 06:28 AM

its not home work, my project requirement. as per environment, allowed to execute the remote command via expect script with bash. . but in this case listed servers are in different suffix domain name. sample below:
pp1.servera.com
pp1.serverb.com

my script working based on giving hostlist file. today I found and need to modify my script to work with short hostname and applying the dns suffix. but I cant able to do. hence I asked help on this portal.

Deviathan · 08-03-2018, 09:12 PM

Honestly you're better off creating a local account on the server you're running this script from and creating some ssh keys to upload those keys to each of the servers you need access to. Then you could use ssh in script without needing to worry about passwords and such.

Expect can be a tricky language to use for something beyond relatively simple things. To make it work well can take time and some level of intricacy, and even then it's not always 100% reliable.

scasey · 08-03-2018, 11:56 PM

This is the upteenth thread prakash0106 has camped on with this problem, which is not stated clearly enough for anyone to help...

The main thread is here -- please post any responses there...if you can figure out what they're asking for help with...

Duplicate post reported.