Wiz-War's host follows the hall's shared layout: its own Caddy site file, its own access log, a memory cap for a shared box

The host's Caddyfile gathers each game's site from /etc/caddy/sites/;
Wiz-War's is rendered from deploy/Caddyfile.tmpl and logs to
wizwar-access.log, which the rollup and the pulse read. The server's memory
cap drops from 700M to 350M (it runs in about 125M), so a runaway cannot
starve other games sharing the box. Applied on the live droplet with its
logs renamed in place.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

deploy/Caddyfile.tmpl

@@ -0,0 +1,27 @@
+# Wiz-War's site on a host shared with the other games of Kestrel's Hall:
+# setup-droplet.sh fills __HOST__ and writes it to /etc/caddy/sites/wizwar.caddy.
+__HOST__ {
+	header {
+		Strict-Transport-Security "max-age=31536000"
+		X-Content-Type-Options "nosniff"
+		X-Frame-Options "DENY"
+		Referrer-Policy "no-referrer"
+	}
+
+	# Kept to 30 rolls of 10MiB: the nightly rollup keeps the counts; the raw
+	# lines back it for a while. Each game on the host keeps its own log.
+	log {
+		output file /var/lib/caddy/wizwar-access.log {
+			roll_size 10MiB
+			roll_keep 30
+		}
+	}
+
+	# A deploy restarts the game for a few seconds; the proxy holds requests
+	# that land in that gap and keeps dialing, so a visitor waits instead of
+	# meeting a 502.
+	reverse_proxy localhost:8787 {
+		lb_try_duration 30s
+		lb_try_interval 250ms
+	}
+}

deploy/README.md

@@ -35,8 +35,9 @@ longer replays becomes unreachable after restart, so this is not optional.
 
 1. `doctl compute droplet create wizwar --region nyc3 --size s-1vcpu-1gb \
     --image ubuntu-24-04-x64 --ssh-keys <your-key-ids> --tag-name wizwar --wait`
-2. `scp deploy/setup-droplet.sh root@<ip>:/root/ && ssh root@<ip> \
-    "bash /root/setup-droplet.sh wizwar.<ip>.sslip.io"`
+2. `scp deploy/setup-droplet.sh deploy/Caddyfile.tmpl root@<ip>:/root/ && ssh root@<ip> \
+    "bash /root/setup-droplet.sh 'wizwar.<ip>.sslip.io'"` (the host's Caddyfile
+    gathers each game's site from /etc/caddy/sites/, so the host can be shared)
 3. `deploy/deploy.sh <ip>`
 
 ## Operations

deploy/setup-droplet.sh

@@ -1,8 +1,12 @@
 #!/usr/bin/env bash
-# One-time droplet setup. Run ON the droplet as root:
-#   bash setup-droplet.sh wizwar.<droplet-ip>.sslip.io
+# One-time host setup. The host may be shared with the other games of
+# Kestrel's Hall; this touches nothing of theirs. Copy it and Caddyfile.tmpl
+# to the host and run ON it as root:
+#   bash setup-droplet.sh 'wizwar.kestrelsnest.social, wizwar.<host-ip>.sslip.io'
+# The argument is Wiz-War's Caddy site address line: one name, or several
+# separated by commas. Every name must already resolve to this host.
 set -euo pipefail
-HOST="${1:?usage: setup-droplet.sh <hostname>}"
+HOST="${1:?usage: setup-droplet.sh <site address line>}"
 
 apt-get update -q
 apt-get install -qy curl git rsync
@@ -24,13 +28,25 @@ id -u wizwar &>/dev/null || useradd -r -m -d /opt/wizwar-home wizwar
 mkdir -p /opt/wizwar /var/lib/wizwar/rooms
 chown -R wizwar:wizwar /opt/wizwar /var/lib/wizwar
 
-# Caddy vhost: auto-TLS, security headers, proxy to the game.
-# Access log kept to 30 rolls of 10MiB: the nightly rollup keeps the
-# counts; the raw lines back it for a while. A deploy restarts the game
-# for a few seconds; the proxy holds requests that land in that gap and
-# keeps dialing, so a visitor waits instead of meeting a 502.
-printf '%s\n\nheader {\n\tStrict-Transport-Security "max-age=31536000"\n\tX-Content-Type-Options "nosniff"\n\tX-Frame-Options "DENY"\n\tReferrer-Policy "no-referrer"\n}\nlog {\n\toutput file /var/lib/caddy/access.log {\n\t\troll_size 10MiB\n\t\troll_keep 30\n\t}\n}\nreverse_proxy localhost:8787 {\n\tlb_try_duration 30s\n\tlb_try_interval 250ms\n}\n' "$HOST" > /etc/caddy/Caddyfile
-systemctl reload caddy
+# Caddy: the host's Caddyfile only gathers each game's site file, so this
+# host can be shared with the other games of Kestrel's Hall. A Caddyfile
+# that is neither Caddy's stock one nor that is a single-site host from
+# before the shared layout: stop rather than overwrite it.
+ROOT_CADDY='# Kestrel'"'"'s Hall: every game on this host brings its own site file.
+import sites/*.caddy'
+mkdir -p /etc/caddy/sites
+if ! grep -q '^import sites/\*.caddy' /etc/caddy/Caddyfile 2>/dev/null; then
+  if [ -s /etc/caddy/Caddyfile ] && ! grep -q 'root \* /usr/share/caddy' /etc/caddy/Caddyfile; then
+    echo "/etc/caddy/Caddyfile holds another site; move it into /etc/caddy/sites/ first" >&2
+    exit 1
+  fi
+  printf '%s\n' "$ROOT_CADDY" > /etc/caddy/Caddyfile
+fi
+sed "s|__HOST__|$HOST|" "$(dirname "$0")/Caddyfile.tmpl" > /etc/caddy/sites/wizwar.caddy
+caddy validate --config /etc/caddy/Caddyfile
+# Validation as root touches the access logs; Caddy runs as caddy and must own them.
+chown -R caddy:caddy /var/lib/caddy
+systemctl reload-or-restart caddy
 
 # Firewall: ssh + web only. The game server binds loopback and is reached
 # through Caddy; nothing else should answer the internet.

deploy/wizwar-rollup.sh

@@ -43,7 +43,7 @@ paths = collections.Counter(); status = collections.Counter(); refs = collection
 # Where a visit came from, when the link itself says so: ?ref=<name> on a
 # link Eric posted, a Facebook click's fbclid, or a utm_source.
 campaigns = collections.Counter(); seen_campaign = set()
-for f in sorted(glob.glob("/var/lib/caddy/access*.log*")):
+for f in sorted(glob.glob("/var/lib/caddy/wizwar-access*.log*")):
     if os.path.getmtime(f) < t0: continue
     opener = gzip.open if f.endswith(".gz") else open
     with opener(f, "rt", errors="ignore") as fh:

deploy/wizwar.service

@@ -27,8 +27,9 @@ ProtectKernelTunables=yes
 ProtectKernelModules=yes
 ProtectControlGroups=yes
 RestrictSUIDSGID=yes
-# A runaway process gets killed and restarted before it can take the box down.
-MemoryMax=700M
+# A runaway process gets killed and restarted before it can take the box, or
+# the other games sharing it, down. The server runs in about 125M.
+MemoryMax=350M
 LimitNOFILE=4096
 
 [Install]