Proxmox VE is a complete open source server virtualization management solution based on Debian. It supports both Linux containers (LXC) and KVM virtual machines and makes them available under an integrated web-based management GUI. With Proxmox VE companies can manage virtual machines, storage (such as Ceph, ZFS, NFS, GlusterFS, and iSCSI), virtualized networks, and highly available clusters. This talk will give attendees an overview of the new features of Proxmox VE 4.0 focusing on the new Proxmox VE HA Manager and the container technology Linux Containers (LXC). It will present how highly available virtual machines can be managed in a multi-node cluster. The talk will also share some insights on how it is to be a developer in open source projects and how to get into it as a student.