Remote discovery of hostname and IP address

Question

In my environment there are about 1000 production servers. Direct root login is disabled on all servers. There is one user "abc" which has sudo access. We login to each computer using "abc" and then sudo su - to get root access.

Please note that I am running this script on a Ubuntu machine and connecting to a RHEL machine.

There is a requirement to know hostname and OS version of each remote server IP.

So I made a script which will connect with remote system and execute a command and saves output in a local file.

Script which I managed to create is as below:

for i in `cat test1` 
do 
{ 
    echo "***************************$i***************************************" 
    sshpass -p 'password' ssh abc@ipaddress “/sbin/ifconfig >> /home/ankush/output.txt”
} 
done 

It connects to all computers IP address present in test1 file and executes, but doesn't execute ifconfig command on the remote system.

On execution it is giving error as:

***************************ip address***************************************
bash: “/sbin/ifconfig: No such file or directory

Answer 1

There is a requirement to know hostname,os version of each remote server ip.

There is an excellent tool for that called nmap. It is available for Ubuntu, link here.

Example:

nmap -sP 192.168.1.*

Here's another link that might be useful.

Answer 2

Ansible can do that (and more) for you :

ansible remotehost -m setup