Server Deployment (LXC + Caddy)

Target: a Proxmox LXC container running Debian 12 in the RZ, publicly reachable on port 443 via Caddy. ~1 GB RAM, 2 cores, 10 GB disk covers >20 agents.

1. Create the LXC (on the hypervisor)

pct create 200 \
  /var/lib/vz/template/cache/debian-12-standard_12.7-1_amd64.tar.zst \
  --hostname proxmox-monitor \
  --memory 1024 --cores 2 \
  --rootfs local-zfs:10 \
  --net0 name=eth0,bridge=vmbr0,ip=dhcp \
  --unprivileged 1 --features nesting=0 --onboot 1
pct start 200
pct enter 200

2. Inside the LXC: base packages

apt-get update && apt-get install -y \
  ca-certificates curl debian-keyring debian-archive-keyring apt-transport-https
# Caddy's apt repo
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | \
  gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' \
  > /etc/apt/sources.list.d/caddy-stable.list
apt-get update && apt-get install -y caddy sqlite3

3. Upload the release

From the operator workstation:

cd proxmox_monitor/server
MIX_ENV=prod mix release --overwrite
tar -czf server_release.tgz -C _build/prod/rel server
scp server_release.tgz root@<LXC-IP>:/tmp/

Back in the LXC:

mkdir -p /opt/proxmox-monitor
tar -xzf /tmp/server_release.tgz -C /opt/proxmox-monitor

4. Directories & env file

install -d -m 0700 /var/lib/proxmox-monitor
cat > /etc/default/proxmox-monitor <<EOF
DATABASE_PATH=/var/lib/proxmox-monitor/monitor.db
SECRET_KEY_BASE=$(/opt/proxmox-monitor/server/bin/server eval 'IO.puts(64 |> :crypto.strong_rand_bytes() |> Base.encode64())' 2>/dev/null | tail -1)
DASHBOARD_PASSWORD_HASH='<paste from: mix run -e "IO.puts(Argon2.hash_pwd_salt(\"your-password\"))">'
PHX_SERVER=true
PHX_HOST=monitor.example.com
PORT=4000
EOF
chmod 0600 /etc/default/proxmox-monitor

5. systemd unit

# /etc/systemd/system/proxmox-monitor.service
[Unit]
Description=Proxmox Monitor Server
After=network-online.target
Wants=network-online.target

[Service]
Type=exec
EnvironmentFile=/etc/default/proxmox-monitor
ExecStartPre=/opt/proxmox-monitor/server/bin/server eval 'Server.Release.migrate()'
ExecStart=/opt/proxmox-monitor/server/bin/server start
ExecStop=/opt/proxmox-monitor/server/bin/server stop
Restart=always
RestartSec=5
User=root

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable --now proxmox-monitor
journalctl -u proxmox-monitor -f   # verify it listens on 4000

6. Caddy

install -m 0644 /opt/proxmox-monitor/server/lib/server-0.1.0/priv/docs/Caddyfile.example /etc/caddy/Caddyfile
# Edit monitor.example.com to match your real DNS.
nano /etc/caddy/Caddyfile
systemctl reload caddy

(If Caddy isn't the one in this LXC, copy the template to wherever Caddy lives.)

7. Create the first host

/opt/proxmox-monitor/server/bin/server rpc 'Server.Release.register_host("pve-host-01")'

Copy the printed TOKEN — you'll paste it into the agent config.

8. Upgrade flow

# operator
cd server && MIX_ENV=prod mix release --overwrite
scp _build/prod/rel/server.tar.gz root@<LXC>:/tmp/server_release.tgz

# LXC
systemctl stop proxmox-monitor
tar -xzf /tmp/server_release.tgz -C /opt/proxmox-monitor --overwrite
systemctl start proxmox-monitor   # ExecStartPre runs migrate automatically

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