nomadboard

README

nomadboard

A read-only status page for Nomad clusters. Groups jobs into logical services, shows health at a glance, and highlights restarts.

Features

• Multi-DC consolidation - Connect to multiple Nomad clusters and see everything in one page.
• Job grouping - Group related jobs via a HUML config file. Groups can span multiple namespaces.
• Restart detection - Shows restart counts within a display window, with a separate shorter alert window for health decisions (avoids false alerts from planned restarts).
• Live updates - Pages refresh automatically via Server-Sent Events (SSE). No manual reload needed.
• Drill-down - Dashboard > Group > Job > Allocations > Task events.
• No IPs exposed - Only shows node names, alloc IDs, and task names. Optional IP masking for node names.
• Read-only - Only uses Nomad read APIs. No write operations.
• Glob patterns - Match job names with * wildcards.
• Single binary - No JS build step, no node_modules. Just Go + embedded templates.

Quick Start

# Copy and edit config
cp config.example.huml config.huml
# Edit clusters and groups...

# Run
go run main.go -config config.huml

# Or build and run
make build
./nomadboard -config config.huml

# Open http://localhost:9999

Configuration

Configuration is in HUML format. See config.example.huml for a minimal setup.

clusters::
  - ::
    name: "dc1"
    address: "http://nomad.internal:4646"
    token_env: "NOMAD_TOKEN"

poll_interval: 30
restart_window: "24h"
restart_alert_window: "30m"
restart_warn: 1
restart_crit: 5
listen: ":9999"

groups::
  - ::
    name: "My Service"
    namespace: "default"
    jobs::
      - "api-server"
      - "worker-*"
  - ::
    name: "Monitoring"
    namespaces::
      - "infra"
      - "platform"
    jobs::
      - "vmagent"

Config Reference

Field	Description	Default
name	Display name shown in UI header and page titles	Nomad Pulse
clusters	List of Nomad cluster endpoints	required
clusters[].name	Short DC name (shown in UI)	required
clusters[].address	Nomad HTTP API address	required
clusters[].token_env	Env var name containing ACL token	optional
poll_interval	Seconds between Nomad API polls	30
per_page	Max jobs per page in group view	20
restart_window	Display window - restarts shown in UI	24h
restart_alert_window	Alert window - restarts affecting health status	30m
restart_warn	Restart count (in alert window) for warning	1
restart_crit	Restart count (in alert window) for critical	5
mask_node_ip	Mask IP-like suffixes in node names (e.g. myapp-10-0-1-5 → myapp-***)	false
timezone	IANA timezone for displaying timestamps (e.g. Asia/Kolkata)	UTC
max_sse_conns	Maximum concurrent SSE connections	128
listen	HTTP listen address	:9999
groups	List of job groups	required
groups[].name	Group display name	required
groups[].namespace	Nomad namespace (single)	optional
groups[].namespaces	Nomad namespaces (multiple)	optional
groups[].priority	Display order (lower first); groups without priority appear after prioritised ones	none
groups[].jobs	List of job name patterns (glob)	required

Pages

• Dashboard (/) - Table of groups with health status per DC, job counts, and restart indicators.
• Group (/group/{slug}) - Table of jobs in the group with type, DC, status, restart count.
• Job (/job/{ns}/{id}?dc=X) - Allocations with task states, restart info, and expandable event log.
• Health (/healthz) - Health check endpoint.

Nomad ACL Policy

Nomadboard only needs read access. Create a minimal read-only ACL policy:

namespace "*" {
  policy = "read"
}

node {
  policy = "read"
}

Apply it and create a token:

# Write the policy
nomad acl policy apply nomadboard-ro -description "Read-only access for nomadboard" nomadboard-policy.hcl

# Create a token with this policy
nomad acl token create -name="nomadboard" -policy="nomadboard-ro" -type="client"

Set the resulting secret ID in the environment variable referenced by token_env in your config.

Building

# Development build
make build

# Linux amd64 release tarball
make dist

# Run tests
make test

Stack

• Go stdlib (net/http, html/template, embed)
• hashicorp/nomad/api - Nomad API client
• go-huml - HUML config parser
• knadh/paginator - SQL-style pagination
• Oat - CSS/JS UI library (~8KB, CDN)