dsh-side-monitor

A read-only system monitor for DeepSeek Harness (DSH) Web: a “System Monitor” entry in the left sidebar footer opens a right-side monitor drawer that shows live host (the machine DSH runs on) overview, process list, and Docker container status.

Read-only by design: no docker restart/stop, no process kill, no exec, no shell. Built for quick resource checks, troubleshooting, and container observation.

Screenshots

Features

Overview

• CPU / memory metric cards: large percentage, sub-info, and an area-filled sparkline (fixed 0–100 axis).
• Network primary-interface throughput / root-partition disk lightweight KPIs.
• Sections below: system load, system info, disk partitions (multiple mount points), network interfaces (default-route + virtual-interface markers), Docker summary (total / running / unhealthy).

Processes

• Source label (host / current container).
• Search / sort / pagination run entirely in the Host RPC (scans all processes, then filters) — stays smooth with large process tables.
• Sort chips for CPU / memory / PID / name; cards show PID · PPID · user, click to expand RSS / uptime / command.
• List and aggregate views: group by name+command, expand to see the PID list.

Docker (Containers)

• Container name / image / state / health (healthy/unhealthy/starting) / CPU% / memory / ports.
• Actionable ports: published Web ports (with hostPort) open in a new tab on click; non-Web ports copy host:port; right-click menu offers HTTP/HTTPS open / copy address.
• Correct handling of 127.0.0.1 / 0.0.0.0 / explicit hostIp (IPv6 auto-bracketed); unpublished ports show 🔒 and cannot be opened; containers with failed stats show a ⚠ tooltip.

UX & Reliability

• Sidebar entry: registered on the sidebar.footer.action slot — shows text when expanded, icon only when collapsed, highlighted while open.
• Responsive: a draggable right drawer on desktop (default 500px, range 360–800px, width persisted); switches to a full-screen page below 768px viewport, using Container Query to adapt to the panel's own width; mobile uses 100dvh + safe-area insets.
• Source identification: auto-detects the environment (Host / Container); top badge + status line (per-module sources for overview / processes / Docker) + a “View data sources” dialog listing the real source paths with a consistency self-check.
• Independent module state: each module has its own error / updated-at; on failure the last good data is kept with a stale banner.
• Protocol handshake: RPC responses carry protocolVersion (v3) + pluginVersion; a mismatch shows a “version mismatch” banner and an About panel (Browser / Host / RPC versions) instead of undefined fields.
• Manual refresh (spinner animation) and a “copy diagnostics” action that generates a one-click diagnostic text.
• Polling stops/pauses when the panel is closed or the tab is hidden; each poll awaits the previous request (no re-entrancy).

Installation

# install from a local directory
dsh plugin --profile web add /path/to/dsh-side-monitor

After installing, refresh the page — a “System Monitor” entry appears at the bottom of the left sidebar.

Host Mount Mode

When DSH runs inside a container, the collectors read the container's own /proc (container view). To monitor the real host, add read-only mounts that expose the host's proc / sys / root filesystem at fixed paths:

services:
  deepseek-harness:
    volumes:
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /:/host/root:ro
      - /var/run/docker.sock:/var/run/docker.sock

The collector auto-detects these paths (host view wins when present, container view otherwise); you can also set them explicitly via plugin config:

procRoot: /host/proc
sysRoot:  /host/sys
fsRoot:   /host/root

Once mounted, overview / processes read host resources and the source label switches to “host view”. Note: /proc, /sys, and / must be mounted read-only.

Refresh Intervals

Data	Interval
CPU / memory / network / load / uptime	2s
Disk	10s (Host-side cache)
Process list	3s (Host-side snapshot cache)
Docker list + stats	5s (stats 3s cache)

Architecture

Client UI (Sidebar Trigger + Monitor Drawer/Fullscreen + 3 Tabs)
        │  RPC: connection.rpc.call('/side-monitor', ...)
        ▼
Host Service (lib/collectors.js + lib/rpc.js)
  ├─ Environment        (mode / systemSource / processSource / dockerSource / hostname)
  ├─ Overview Collector (procRoot/stat|meminfo|loadavg|uptime|cpuinfo|sys/kernel/osrelease + fsRoot/etc/os-release + net/dev|net/route + mounts/statfs)
  ├─ Process Collector  (procRoot/<pid>/stat|status|cmdline, host-side search/sort/pagination, PPID included)
  ├─ Network Collector  (procRoot/net/dev sampled diff + procRoot/net/route default route + fib_trie/if_inet6 interface IPs)
  ├─ Disk Collector     (procRoot/mounts + statfs multi-mount, mountinfo major:minor dedup, 10s cache)
  └─ Docker Collector   (/var/run/docker.sock read-only Engine API, health + structured ports)

Security

• The browser never touches the host filesystem or the Docker socket directly — all collection goes through the Host-side whitelisted RPC.
• The Host exposes only three read-only endpoints under /side-monitor: overview / processes / containers; permissions follow the standard DSH trusted-host role.
• No arbitrary command execution, no generic Docker API proxy, no control operations.
• In Host Mount Mode, /host/proc, /host/sys, and /host/root must be mounted read-only.

Development

npm run check   # syntax check
npm test        # node:test unit tests (test/fixtures/proc are real /proc snapshots)

CI: GitHub Actions (Node 20 / 22) runs check + test automatically.

Known Limitations

• The full host PID view is available via pid: host but is not forced by default; enabling it makes the consistency self-check report that the PID namespace is not isolated.
• Host/container process view switching, a settings page, historical trends, and native DSH Side Card integration are planned for later releases.

Changelog

• v0.2.2 — Reliability: network uses /proc/net/dev as source of truth (interfaces/traffic kept even when IP resolution fails); CPU distinguishes physical cores / logical CPUs; Docker port refinements (loopback locking, hostIp dedup, localized uptime); RPC version handshake; process aggregate view; mobile 100dvh + safe areas; fixture unit tests and CI.
• v0.2.1 — Host metric accuracy: load / uptime / CPU model / kernel / OS read from real host sources; process uptime uses host uptime; network IPs from /proc/net/fib_trie and if_inet6; disk dedup via mountinfo major:minor; source self-check.
• v0.2.0 — Source identification, redesigned CPU/memory cards, actionable Docker ports, Host Mount Mode.
• v0.1.0 — Initial release: responsive monitor panel.

License

MIT