Debsync is a Python tool that allows effortless synchronization of installed Debian package lists across multiple systems, by using a command-line interface.
Debsync works by pulling a list of installed packages from a master host and then comparing that list to the other machines in your network. Once a discrepancy is found, debsync installs or removes packages on the other hosts to match the master's package list.
One great thing about debsync is that it works over ssh by default, but you can also choose to use rsh if that's your preference.
While Full Automated Installation (fai) is a useful tool in its own right, it doesn't have the same end goal as debsync. With fai, you're working with a set of machines that you plan to install automatically and identically. Debsync, on the other hand, is all about updating a group of existing and different machines to the same level as the master host.
Overall, debsync is a powerful and effective tool for managing multiple Debian GNU/Linux machines. It takes care of the heavy lifting so you don't have to.
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