Thread: Script to get info from multiple servers

Hi,

I want to collect info from a no. of servers whether there grub.conf contain "elevator" parameter or not.

What I want is


Code:

sudo cat /etc/grub.conf | grep -q "elevator=noop"; echo $?

If output is "0", I want name of that host in a file called "present"
if its not "0", I want that hostname in a file called "not-present".

Now, Password less key authentication is something I can not do as of now. I am okay with specifying password in script.

Can someone please help me achieving this?

Hi,

Code:

#!/bin/bash
# store username:ip combo here separated by a whitespace
_pair="root@192.168.250.30"
GRUB="/boot/grub/grub.cfg"
for e in $_pair
do
             # extract user and ips for each $e in $_pair
        IFS='@'
        set -- $e
        _user="$1"
        _ip="$2"

        sleep 2
        echo "Connecting to server '${_ip}' via SSH..."
        ssh ${_user}@${_ip} "if grep -q "elevator=noop" "$GRUB" >/dev/null; then
        echo "Present"
        else echo "not present"
        fi "
done

Hey,

Thanks a lot Rahul, That script is working perfectly for the purpose it was made.

I experienced some problem while making best of it:

I 've around 150 servers on which I want to run this, so it would be good if the script picks up the server name or Ip's from a different file.

Also I don't want to give password every time, and as password less authentication is not present in my environment, I've to pass the password in script itself which really doesn't bother me, I can do that, Its not like I am entering root password. I'll do everything my my ID. I know it could be done through expect but I messed everything every time I tried using it.

3rd thing, whenever I ssh a server it gives me following message(not always, sometimes)

HTML Code:

The authenticity of host '10.40.111.111' can't be established.
RSA key fingerprint is e8:67:3b:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx.
Are you sure you want to continue connecting (yes/no)?

so it expect a yes, I've to bypass this too if it is asked.

Hi,

Better and Secure is load keys on all servers.
i don't know about expect but you can search on this forum you will find more link on the same , check this link

Originally Posted by Rahul.Patil

Hi,

Better and Secure is load keys on all servers.
i don't know about expect but you can search on this forum you will find more link on the same , check this link

Hmm .. Okay .. Can you tell me how to make your script to pick server names/ip's from a file ?

Originally Posted by stunn3r

Hmm .. Okay .. Can you tell me how to make your script to pick server names/ip's from a file ?

just do this

_pair="$(cat /tmp/ip_list.txt)"

and /tmp/ip_list.txt file should be as below
user@192.168.1.10
user@192.168.1.11
user@192.168.1.13

Originally Posted by Rahul.Patil

_pair="$(cat /tmp/ip_list.txt)"

Or use <

Code:

_pair="$(</tmp/ip_list.txt)

Originally Posted by nixcraft

Or use <

Code:

_pair="$(</tmp/ip_list.txt)

Thanks a lot sir .. It worked ..

here it is:

Code:

#!/bin/bash


GRUB="/etc/grub.conf"
_pair="$(</home/wadhwaso/login.txt)"
for e in $_pair
do
             # extract user and ips for each $e in $_pair
        IFS='@'
        set -- $e
        _user="$1"
        _ip="$2"


        sleep 2
        echo "Connecting to server '${_ip}' via SSH..."
        ssh ${_user}@${_ip} "if sudo grep -q "elevator=noop" "$GRUB" >/dev/null; then
        echo "Present"
        else echo "not present"
        fi "
done

Honestly, I never understood significance of "e" here and what is "IFS" .. I just started watching some videos about scripting, dont have mush idea about it. Could you please explain these things in the script

Also I am trying to use expect in the script so that I dont have to give password. I'll post it here once I get it to work.

Again, Thank You .

One more question:

what I want to do is instead of echo'ing "present" I want that {_ip} to go in a local file called "present" on the server from I am running the script and for "not present" I want that {_ip} to go in a local file called "not-present" on the server from I am running the script

Originally Posted by stunn3r

One more question:

what I want to do is instead of echo'ing "present" I want that {_ip} to go in a local file called "present" on the server from I am running the script and for "not present" I want that {_ip} to go in a local file called "not-present" on the server from I am running the script

You just need to use ${_ip} as below

Code:

echo "not present on ${_ip}"