Is PVE open source? Can users develop again?What do you mean, could you elaborate a bit more?
If it's reinstalling Proxmox VE without loosing any data you can use backup restore for that.
Read the full license over at gnu.org: https://www.gnu.org/licenses/agpl-3.0.en.html (there's a language selector at the top right, maybe your native language is available too)But, if you make modifications to Proxmox VE itself and host any service with that, you need to redistribute the changes made and disclose this to anyone using the service. I.e., you cannot just switch some logo and a bit of style sheet code, then play commercial hoster using this modified version as interface for customers without releasing those changes and/or without denoting that it runs effectively a (lightweight) fork of Proxmox VE, copyright and AGPL license information.
Thanks,and how i get source code?Proxmox VE is licensed under the AGPLv3, which means that it's open source but you cannot make changes and just redistribute on your own, iow. it has strong protections against proprietary companies/projects/people snooping up the projects work and redistribute as their own, see this excerpt for some details/examples:
Read the full license over at gnu.org: https://www.gnu.org/licenses/agpl-3.0.en.html (there's a language selector at the top right, maybe your native language is available too)
If you want to contribute patches to Proxmox VE itself see https://pve.proxmox.com/wiki/Developer_Documentation and ensure you send a signed CLA like described at the bottom https://pve.proxmox.com/wiki/Developer_Documentation#Software_License_and_Copyright
So, yes you can contribute patches and you can also re-develop, but you must adhere to the rules the AGPLv3 licenses enforces.
If you'd actually read the developer link I posted, you'd get all the relevant info...Thanks,and how i get source code?
No, github is a proprietary platform with several restrictions and lock-in, we only host a few mirrors there.