In our company we have multiple raspberry pi's in our network. These devices don't have access to the internet however. We would like to keep our devices up to date and since it would be a lot of work to constantly get the individual pi's, hook them up to a cable that does have access to the internet and update them, I was wondering if there is a way to automate the process.
For example have one pi at a central location (with access to internet of course) that downloads all the updates and other devices on the network can access these updates over the local network and install them.
Is this possible and how would I go about in doing this? Unfortunately I don't have much experience with Linux.
We mostly have Raspberry pi 2's and 3's, one raspberry revolution and probably a Pi B+ here and there.
Thank you for your advice