Show HN: Hosting 100 Linux dev environments on one VM using LXC

Summary

Containarium Run hundreds of isolated Linux development environments on a single VM. Built with LXC, SSH jump hosts, and cloud-native automation. 🚫 No Kubernetes 🚫 No VM-per-user ✅ Just fast, cheap, isolated Linux environments Why Containarium? Most teams still provision one VM per developer for SSH-based development. That approach is: 💸 Expensive 🐢 Slow to provision 🧱 Wasteful (idle CPU, memory, disk) Containarium replaces that model with multi-tenant system containers (LXC): One VM → many isolated Linux environments → massive cost savings In real deployments, this reduces infrastructure costs by up to 90%. What It Does Containarium is a container-based development environment platform that: Hosts many isolated Linux environments on a single cloud VM Gives each user SSH access to their own container Uses LXC system containers (not Docker app containers) Keeps containers persistent, even across VM restarts Is managed via a single Go CLI + gRPC Each container behaves like a lightweight VM: Full Linux OS User accounts SSH access Can run Docker, build tools, ML workloads, etc. Architecture (High Level) Developer Laptop | | ssh (ProxyJump) v +-------------------+ | SSH Jump Host | (no shell access) +-------------------+ | v +----------------------------------+ | Cloud VM (Host) | | | | +---------+ +---------+ | | | LXC #1 | | LXC #2 | ... | | | user A | | user B | | | +---------+ +---------+ | | | | ZFS-backed persistent storage | +----------------------------------+ Key Features 🚀 Fast Provisioning Create a full Linux environment in seconds No VM boot, no OS installation per user 🔐 Strong Isolation Unprivileged LXC containers Separate users, filesystems, and processes SSH jump host prevents direct host access 💾 Persistent Storage Containers survive: VM restarts Spot/preemptible instance termination Backed by ZFS persistent disks ⚙️ Simple Management Single Go binary gRPC-based control plane Terraform for infrastructure provisioning 💰 Cost Efficient Example (illustrativ...