Add system info

app.py

@@ -48,6 +48,68 @@ def docker_stats() -> dict:
         }
     return stats
 
+import re
+
+def docker_info() -> dict:
+    # docker info --format "{{json .}}" gives us structured host-level info
+    out = sh([DOCKER, "info", "--format", "{{json .}}"])
+    return json.loads(out)
+
+def docker_system_df() -> dict:
+    # Parse `docker system df` (text). It's stable enough for a dashboard.
+    out = sh([DOCKER, "system", "df"])
+    # Example lines:
+    # Images          175       18        15.15GB   13.93GB (91%)
+    # Containers      27        26        145.1MB   16.57kB (0%)
+    # Local Volumes   47        1         817.7MB   817.7MB (100%)
+    # Build Cache     889       0         423B      423B
+    rows = {}
+    for line in out.splitlines():
+        line = line.strip()
+        if not line or line.startswith("TYPE"):
+            continue
+        parts = re.split(r"\s{2,}", line)
+        if len(parts) >= 5:
+            typ, total, active, size, reclaimable = parts[:5]
+            rows[typ] = {
+                "total": total,
+                "active": active,
+                "size": size,
+                "reclaimable": reclaimable,
+            }
+    return rows
+
+def system_summary() -> dict:
+    info = docker_info()
+    df = docker_system_df()
+
+    return {
+        "name": info.get("Name", ""),
+        "server_version": info.get("ServerVersion", ""),
+        "operating_system": info.get("OperatingSystem", ""),
+        "os_type": info.get("OSType", ""),
+        "architecture": info.get("Architecture", ""),
+        "kernel_version": info.get("KernelVersion", ""),
+        "cpus": info.get("NCPU", ""),
+        "mem_total": info.get("MemTotal", ""),  # bytes
+        "containers": info.get("Containers", ""),
+        "containers_running": info.get("ContainersRunning", ""),
+        "containers_stopped": info.get("ContainersStopped", ""),
+        "images": info.get("Images", ""),
+        "docker_root_dir": info.get("DockerRootDir", ""),
+        "system_df": df,
+    }
+
+def format_bytes(n: int) -> str:
+    # for mem_total
+    units = ["B", "KB", "MB", "GB", "TB"]
+    f = float(n)
+    for u in units:
+        if f < 1024 or u == units[-1]:
+            return f"{f:.1f}{u}"
+        f /= 1024
+    return f"{n}B"
+
 def docker_inspect_restart_count(container_name: str) -> int:
     # RestartCount is useful when stuff is flapping / OOMing
     try:
@@ -126,11 +188,22 @@ def collect():
             warnings.append(f"{a['app']} RAM high ({a['mem_pct']})")
         if a["restarts"] >= 3:
             warnings.append(f"{a['app']} restarting (restarts={a['restarts']})")
+    
+    sysinfo = system_summary()
+
+    # format mem bytes nicely
+    try:
+        mem_total_h = format_bytes(int(sysinfo["mem_total"]))
+    except Exception:
+        mem_total_h = ""
+
+    sysinfo["mem_total_h"] = mem_total_h
 
     return {
         "generated_at": datetime.utcnow().isoformat() + "Z",
         "poll_seconds": POLL_SECONDS,
         "domain": APP_DOMAIN,
+        "system": sysinfo,
         "apps": apps,
         "infra": infra,
         "warnings": warnings,

templates/apps_table.html

@@ -1,3 +1,50 @@
+<h2>System</h2>
+<div style="display:grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 12px 0 18px 0;">
+    <div style="border:1px solid #ddd; border-radius: 10px; padding: 12px;">
+        <div class="muted">Host</div>
+        <div><strong>{{ data.system.name or "—" }}</strong></div>
+        <div class="muted">{{ data.system.operating_system }} · {{ data.system.kernel_version }}</div>
+    </div>
+
+    <div style="border:1px solid #ddd; border-radius: 10px; padding: 12px;">
+        <div class="muted">Compute</div>
+        <div><strong>{{ data.system.cpus or "—" }}</strong> CPUs</div>
+        <div><strong>{{ data.system.mem_total_h or "—" }}</strong> RAM</div>
+    </div>
+
+    <div style="border:1px solid #ddd; border-radius: 10px; padding: 12px;">
+        <div class="muted">Docker</div>
+        <div>Engine: <strong>{{ data.system.server_version or "—" }}</strong></div>
+        <div>Images: <strong>{{ data.system.images or "—" }}</strong></div>
+        <div>Containers: <strong>{{ data.system.containers_running or "—" }}</strong> running / <strong>{{
+                data.system.containers_stopped or "—" }}</strong> stopped</div>
+    </div>
+</div>
+
+<h3>Docker disk usage</h3>
+<table>
+    <thead>
+        <tr>
+            <th>Type</th>
+            <th>Total</th>
+            <th>Active</th>
+            <th>Size</th>
+            <th>Reclaimable</th>
+        </tr>
+    </thead>
+    <tbody>
+        {% for typ, r in data.system.system_df.items() %}
+        <tr>
+            <td><strong>{{ typ }}</strong></td>
+            <td>{{ r.total }}</td>
+            <td>{{ r.active }}</td>
+            <td>{{ r.size }}</td>
+            <td>{{ r.reclaimable }}</td>
+        </tr>
+        {% endfor %}
+    </tbody>
+</table>
+
 <div class="muted">Generated at: {{ data.generated_at }}</div>
 
 {% if data.warnings %}