[SOLVED] Assistance with "Expect" - Reading a list of servers and running against that

xenner · 03-03-2014, 11:29 PM

Hello,

I have written a script for this a looongg time ago, but I have NO idea how I got it working, I have searched both here, and google for the answer, but I have had no luck.

All I want to do is have Expect run a 'wget' command inside fifty servers which are all listed in one file, line by line.

This shouldn't be difficult, but for some reason, I can't get it working.

If it's possible to have the script request the password as input, as a one time only thing..
ie.
echo "Type the password:"
read -s password

Then call it later.

In short.. ssh into each machine listed in the 'servers' file, run a wget on each machine to pull a file down, and move it to a new location, then exit. Like a "for i in `cat servers` ; do ssh user@$i && wget /tmp/ http://google.com ; done

Except, obviously, that doesn't work... THANKS!! You guys rock!

linosaurusroot · 03-04-2014, 10:23 AM

I'd use autoexpect to create the expect script that calls ssh and enters a password.

I'd use shell to run the expect script against all the servers providing stdin of the commands wanted on each server.

Code:

for i in `cat servers`
do
  e < w
done

xenner · 03-04-2014, 05:01 PM

Hi linosaurusroot,

Thanks for the reply.

Although that will work, I'm more after a single file / script to run in order to do this.

Do you know a way to get expect to look through a file by itself? I know it can definitely do it, I just can't recall how.
I did find a method that might be useful, but I'm not able to get it working..
ie.

Code:

#!/usr/bin/expect

set servers [open "vms"]
set servernames [split [read $servers] "\n"]
close $servers

foreach server $servernames {
        spawn ssh root@$server
        expect "assword:"
        send "p@55word\r"
        expect "$ "
        send "wget -O /tmp/TEST.ONLY http://server_CNAME/file_to_retrieve\r"
        send "exit\r"
        expect eof
close
}

But from there, I'm not sure where I would go... When I place commands after this section, it logs into the first server I have in the list, it sits there for a bit, then runs the wget, runs the 'exit command, closes the connection to that first server, then the script dies, (without moving to the next server) stating:

Code:

spawn_id: spawn id exp4 not open
    while executing
"close"
    ("foreach" body line 9)
    invoked from within
"foreach server $servernames {
        spawn ssh root@$server
        expect "assword:"
        send "p@55word\r"
        expect "$ "
        send "wget -O /tmp/TEST.ONLY http://serv..."
    (file "./new_script" line 7)

Any ideas? Thanks guys!

xenner · 03-10-2014, 11:11 PM

Hey,

So, I couldn't find a solution to this, so I just ran it with a for loop, and pasted the password in each time.
Thanks for your assistance anyway!

for i in `cat vms` ; do ssh $i "wget -O /usr/bin/SCRIPT http://satellite/pub/SCRIPT && chmod 766 /usr/bin/SCRIPT && exit" ;done

For those that would like to know....
Essentially, this just ran through a file, with a heap of servers listed line by line, and SSH'd into each of them, then ran each command and exit'd.

Thanks,

Xen.

xenner · 03-17-2014, 06:23 PM

I figured another way to do this, just for any future people that need this done also.

I basically run a for loop against the bottom script... Where "server_list" is a line by line list of servers,

Code:

 for i in `cat server_list` ; do ./below_script $i ; done

Code:

#!/usr/bin/expect -f
set server [lrange $argv 0 0]
        spawn ssh username@$server
                expect "*?assword:*"
                send -- "P@ssword_HERE\r"
                expect "*\r"
                expect "\r"
                send -- "Command to run here\r"
                send -- "\r"
                send -- "exit\r"
expect eof

I hope that helps!

Xen.