If you need to install a few programs on around 40K linux machines, and would like to know what options you have to do it as efficiently as possible. Here I tried to show you installation of JDK (6/7/8) on multiple linux machines through automation script. You can install any other applications as well through these simple steps.
Linux
Linux: Password-Less SSH Logins
Before go directly into password less SSH login, I would like to discuss about SSH login details.
SSH (Secure SHELL) is an open source and most trusted network protocol that is used to login into remote servers for execution of commands and programs.