Linux Utility to manage login to systems

One of the problem I used to have as build & release engineer is to manage login to huge number of boxes through my Linux system. At the scale of 5-10 machine it’s a not a big problem but once you have close to 100+ boxes then it is not humanly possible to remember the ip’s of those boxes.
The usual approach for this problem is to maintain a reference file, from where you map machine name with the ip & find the ip of the box from this file, but again after some time this solution seems to be not that efficient. Another solution is to have a DNS server where you can store such mappings & then you can access these machines using their names only, this is the idle solution but what if you don’t have DNS server also still you have to execute the ssh command ‘ssh user@machine”.

I developed a simple solution for this problem, I created a utility script, this script takes machine name as an argument & then we have multiple conditions statements which checks which ssh command to be executed for the machine name.

if [ “mc1” == $1 ]; then
    ssh user@
elif [ “mc2” == $1 ]; then
    ssh user@
elif [ “mc3” == $1 ]; then
    ssh user@

This solution worked really well for me as now I’m saved from executing whole ssh command, also for machine name I’ve followed a convention i.e _ for example the entry for a machine for release environment that is hosting an application catalog the machine name would be release_catalog, similarly dev_catalog, staging_catalog, pt_catalog.. so you don’t have to remember machine names as well :).

Ubuntu Rest Assurer

Before I’ll start talking about this utility I would like to talk about the story behind the creation of this utility. Few days back we have a session ERGONOMICS about healthy lifestyle, one of the main thing was that a person should take a break after every 20 minutes. After the session I was having a chit chat about one of my colleague Rahul Narang & we were discussing about this 20:20:20 rule & then we thought about creating a utility that will force a person to leave his/her system after some stipulated time & that’s how the idea came about this utility.

So what this utility does
1.) It runs after every half hour or configured amount of time
2.) Prompts a snoozer dialog box which will allow a person to snooze the screen locking for some amount of time
3.) After that a lunching video will run for 10 seconds
4.) Once a lunching video completes the screen gets locked for a configured amount of time
5.) If user try to unlock the system before configured amount of time the utility will lock the screen again

This complete utility is created using shell script only, we have used couple of command to do that
vlc : To run a launcher video
zenity : To prompt a snooze dialogue box
gnome-screensaver-command : To operate on screen lock

You can find the source code of this utility at my github account