Add Phase 13: Minecraft server VMs on R720
Documents creating four Minecraft VMs (201-204) on the second Proxmox host (R720), following the same wizard-driven setup style as Phases 11-12 but without GPU/Coral/raw-disk passthrough, which only applies to the R730xd. Adds matching VM config templates.
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Claude
@@ -21,6 +21,7 @@ one document.
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- [Phase 10 — GPU Passthrough Setup](#phase-10--gpu-passthrough-setup)
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- [Phase 11 — Create the VMs](#phase-11--create-the-vms)
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- [Phase 12 — Deploy Frigate in VM 101](#phase-12--deploy-frigate-in-vm-101)
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- [Phase 13 — Minecraft Server VMs (R720)](#phase-13--minecraft-server-vms-r720)
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---
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@@ -3261,6 +3262,219 @@ stats. Navigate to **System → Stats** to confirm:
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---
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## Phase 13 — Minecraft Server VMs (R720)
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**What this phase does:** Creates four Minecraft server VMs on a second,
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separate Proxmox host — a Dell R720 — using the same wizard-driven VM setup
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as Phases 11/12, but without any of the GPU passthrough, Coral USB, or raw
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drive passthrough work. Minecraft needs CPU, RAM, and disk — nothing else.
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**Hardware (this host, not the R730xd):**
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| Component | Detail |
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|-----------|--------|
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| Server | Dell PowerEdge R720 |
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| CPU | 2x Intel Xeon E5-2697 v2 (12c/24t each — 24 cores / 48 threads total) |
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| RAM | 125 GiB |
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| Storage | 5x spinning HDD behind PERC H710 (no SSD) — `local-lvm` |
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| Network | `eno1` → `vmbr0`, single 1GbE link |
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| Proxmox | VE 8.1.3 |
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> **No GPU passthrough, no Coral, no raw disk passthrough on this host.**
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> Skip `gpu-passthrough-setup.sh`, `build-bay-map.sh`, and `perc-nonraid.sh`
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> entirely — those only apply to the R730xd's Frigate/storage workload.
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> VM disks here are plain `local-lvm` virtual disks, same as VM 102 in the
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> R730xd setup.
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> **All HDDs, no SSD.** Minecraft autosaves and region-file writes are small
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> and frequent. Expect more I/O wait under heavy load (many players, modded
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> redstone/farms) than an SSD host would show. If a server feels laggy under
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> load, check `iostat -x 2` on the Proxmox host before assuming it's CPU.
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**Prerequisites:**
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- VMs 101, 102, 106 removed from this host (freed full 24c/48t, 125GiB, and
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all five disks for this phase)
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- Ubuntu Server 24.04.4 LTS ISO uploaded to this host's `local` storage
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(same download step as Phase 11, Step 11.1/11.2 — repeat on the R720)
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---
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### Step 13.1 — Create VM 201 (Survival/Paper #1) via the wizard
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In the R720's Proxmox web UI, click **Create VM**.
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**Tab: General**
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| Field | Value |
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|-------|-------|
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| VM ID | 201 |
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| Name | mc-survival-1 |
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**Tab: OS**
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| Field | Value |
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|-------|-------|
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| ISO image | ubuntu-24.04.4-live-server-amd64.iso |
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| OS Type | Linux |
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| Version | 6.x - 2.6 Kernel |
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**Tab: System**
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| Field | Value |
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|-------|-------|
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| Graphic card | Default |
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| Machine | i440fx |
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| BIOS | SeaBIOS |
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| SCSI Controller | VirtIO SCSI Single |
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| Qemu Agent | checked |
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> **Why SeaBIOS/i440fx here instead of OVMF/q35 like Phases 11–12?** Those
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> were required for GPU passthrough on the R730xd. Nothing on this host is
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> being passed through, so there's no reason to take on UEFI's extra
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> complexity (Secure Boot prompts, EFI disk, etc.).
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**Tab: Disks**
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| Field | Value |
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|-------|-------|
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| Bus/Device | SCSI / 0 |
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| Storage | local-lvm |
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| Disk size (GiB) | 20 |
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| Cache | Write back |
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| Discard | checked |
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| IO thread | checked |
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**Tab: CPU**
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| Field | Value |
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|-------|-------|
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| Sockets | 1 |
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| Cores | 4 |
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| Type | host |
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**Tab: Memory**
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| Field | Value |
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|-------|-------|
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| Memory (MiB) | 8192 |
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| Ballooning | unchecked |
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> **Why disable ballooning?** Minecraft's JVM heap grabs and holds memory.
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> Letting Proxmox reclaim "idle" RAM from the VM fights with the JVM and can
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> trigger GC pauses or swapping inside the guest. Fix the allocation instead.
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**Tab: Network**
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| Field | Value |
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|-------|-------|
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| Bridge | vmbr0 |
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| Model | VirtIO (paravirtualized) |
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| Firewall | checked |
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Click **Finish**, then **Start** the VM and install Ubuntu Server normally
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(same installer flow as Phase 11 — set hostname `mc-survival-1`, enable
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OpenSSH server during install).
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---
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### Step 13.2 — Repeat for VMs 202–204
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Same wizard steps as 13.1, changing only VM ID/name, cores, and memory:
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| VM ID | Name | Cores | Memory | Disk | Notes |
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|-------|------|-------|--------|------|-------|
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| 201 | mc-survival-1 | 4 | 8192 MiB | 20G | Paper, vanilla-like |
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| 202 | mc-survival-2 | 4 | 8192 MiB | 20G | Paper, vanilla-like |
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| 203 | mc-modded | 6 | 12288 MiB | 30G | Forge/NeoForge modpack |
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| 204 | mc-minigames | 2 | 4096 MiB | 15G | Creative/minigames |
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This commits 16 of 24 cores and 32 of 125 GiB RAM — leaving headroom for
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Proxmox itself and room to add a fifth server later without resizing
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anything.
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---
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### Step 13.3 — Install Java and the server jar (inside each VM)
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SSH into each VM and run:
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```bash
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sudo apt update && sudo apt install -y openjdk-21-jre-headless
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sudo useradd -m -s /bin/bash minecraft
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sudo mkdir -p /opt/minecraft
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sudo chown minecraft:minecraft /opt/minecraft
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```
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Download the server jar as the `minecraft` user (Paper for 201/202/204,
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the modpack's server pack for 203), accept the EULA:
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```bash
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sudo -u minecraft bash -c '
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cd /opt/minecraft
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curl -o server.jar "<paper or modpack server jar URL>"
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echo "eula=true" > eula.txt
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'
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```
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---
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### Step 13.4 — Create a systemd service per VM
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```bash
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sudo tee /etc/systemd/system/minecraft.service <<'EOF'
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[Unit]
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Description=Minecraft Server
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After=network.target
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[Service]
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User=minecraft
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WorkingDirectory=/opt/minecraft
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ExecStart=/usr/bin/java -Xms2G -Xmx<HEAP> -jar server.jar nogui
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Restart=on-failure
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RestartSec=10
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[Install]
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WantedBy=multi-user.target
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EOF
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sudo systemctl daemon-reload
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sudo systemctl enable --now minecraft.service
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```
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Set `-Xmx` to roughly RAM minus 1.5–2 GiB headroom for the OS (e.g. 6G heap
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on the 8 GiB VMs, 10G heap on the 12 GiB VM, 2.5G heap on the 4 GiB VM).
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---
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### Step 13.5 — Open ports
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One port per server, forwarded from the router/firewall to each VM's IP:
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| VM | Port |
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|----|------|
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| 201 | 25565 |
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| 202 | 25566 |
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| 203 | 25567 |
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| 204 | 25568 |
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```bash
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sudo ufw allow 25565/tcp # adjust per VM
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```
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---
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### Phase 13 complete — summary
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| What is done | Status |
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| VMs 201–204 created with fixed (non-ballooned) CPU/RAM | ✓ |
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| Ubuntu Server installed in each, SSH access confirmed | ✓ |
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| Java + server jar installed, EULA accepted | ✓ |
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| systemd service running each server, restarts on crash | ✓ |
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| Ports forwarded per server | ✓ |
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---
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## Troubleshooting
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### GPU not passing through — still shows `nouveau`
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@@ -0,0 +1,24 @@
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# Proxmox VM 201 — Minecraft Survival #1 (R720)
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#
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# Copy to /etc/pve/qemu-server/201.conf on the R720 host.
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# No GPU, no USB, no raw drive passthrough — plain local-lvm disk.
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agent: 1
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bios: seabios
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boot: order=scsi0
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cores: 4
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cpu: host
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machine: i440fx
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memory: 8192
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balloon: 0
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name: mc-survival-1
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numa: 0
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ostype: l26
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scsihw: virtio-scsi-single
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sockets: 1
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# OS + world disk
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scsi0: local-lvm:vm-201-disk-0,cache=writeback,discard=on,iothread=1,size=20G
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# Network
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net0: virtio,bridge=vmbr0,firewall=1
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@@ -0,0 +1,24 @@
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# Proxmox VM 202 — Minecraft Survival #2 (R720)
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#
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# Copy to /etc/pve/qemu-server/202.conf on the R720 host.
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# No GPU, no USB, no raw drive passthrough — plain local-lvm disk.
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agent: 1
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bios: seabios
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boot: order=scsi0
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cores: 4
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cpu: host
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machine: i440fx
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memory: 8192
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balloon: 0
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name: mc-survival-2
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numa: 0
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ostype: l26
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scsihw: virtio-scsi-single
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sockets: 1
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# OS + world disk
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scsi0: local-lvm:vm-202-disk-0,cache=writeback,discard=on,iothread=1,size=20G
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# Network
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net0: virtio,bridge=vmbr0,firewall=1
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@@ -0,0 +1,25 @@
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# Proxmox VM 203 — Minecraft Modded (R720)
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#
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# Copy to /etc/pve/qemu-server/203.conf on the R720 host.
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# No GPU, no USB, no raw drive passthrough — plain local-lvm disk.
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# Larger allocation — modpacks (Forge/NeoForge) need more heap than vanilla/Paper.
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agent: 1
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bios: seabios
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boot: order=scsi0
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cores: 6
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cpu: host
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machine: i440fx
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memory: 12288
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balloon: 0
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name: mc-modded
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numa: 0
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ostype: l26
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scsihw: virtio-scsi-single
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sockets: 1
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# OS + world disk
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scsi0: local-lvm:vm-203-disk-0,cache=writeback,discard=on,iothread=1,size=30G
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# Network
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net0: virtio,bridge=vmbr0,firewall=1
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@@ -0,0 +1,25 @@
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# Proxmox VM 204 — Minecraft Minigames/Creative (R720)
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#
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# Copy to /etc/pve/qemu-server/204.conf on the R720 host.
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# No GPU, no USB, no raw drive passthrough — plain local-lvm disk.
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# Smallest allocation — lighter player count / simpler worlds.
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agent: 1
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bios: seabios
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boot: order=scsi0
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cores: 2
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cpu: host
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machine: i440fx
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memory: 4096
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balloon: 0
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name: mc-minigames
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numa: 0
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ostype: l26
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scsihw: virtio-scsi-single
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sockets: 1
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# OS + world disk
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scsi0: local-lvm:vm-204-disk-0,cache=writeback,discard=on,iothread=1,size=15G
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# Network
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net0: virtio,bridge=vmbr0,firewall=1
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