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Kener Kener

Stack

Monitoring

Status page with built-in monitoring: it checks your sites, APIs, ports and DNS on a schedule and shows uptime, response times, incidents and planned maintenance on a public page. Source: https://github.com/rajnandan1/kener

Source details

Repo: rajnandan1/kener
Stars: 5k
Forks: 309
Language: TypeScript
License: MIT
Latest: v4.1.7 · 13 days ago
Updated: 16 hours ago
Website: kener.ing/

Configuration

Type
Compose
Platform
linux
Env vars
KENER_URL=''KENER_SECRET=''KENER_PORT=3700
Restart
unless-stopped
Source
Repo

Template by NotAFlightRisk·Source

Report issue

Notes

Fill in the address and secret key before you deploy, since the stack won't start without them. The address has to be exactly what you'll type in the browser, like http://192.168.1.20:3700: the port you're using, and no slash at the end. Kener refuses any form sent from another address, so if it's wrong the status page still shows but signing in or saving anything gives you Cross-site POST form submissions are forbidden. To fix it, change the address in the stack's environment variables and redeploy. Then go to /account/signin straight away, as the first person there sets up the admin account. New monitors need a type under Configuration (the service URL on its own is just a link), and only show on the public status page once you add them to it under Pages. The two sample monitors check kener.ing and load their icons from there for every visitor, so delete them when you've added your own. Settings, monitors and their history live in the kener-data volume. Docs: kener.ing/docs

Services

kener

Configuration

Image
rajnandan1/kener:latest
Ports
${KENER_PORT:-3700}:3000
Volumes
/app/database : kener-data
Env vars
ORIGIN=${KENER_URL:?Set the address you'll open it on}KENER_SECRET_KEY=${KENER_SECRET:?Set a secret key}REDIS_URL=redis://redis:6379
Restart
unless-stopped

Image details

Pulls: 406k
User: rajnandan1
Created: Jan 24, 2024
Updated: 15 hours ago
Status: active

redis

Configuration

Image
redis:7-alpine
Volumes
/data : redis-data
Restart
unless-stopped

Image details

Pulls: 11.5B
User: stackbrew
Created: Jun 05, 2014
Updated: 13 days ago
Status: active

Standalone Install

Select an install method, to see config/commands for deploying Kener

Installation method

Install on Portainer

Import all app templates into your Portainer instance, for easy 1-click deploys

  1. Ensure both Docker and Portainer are installed, and up-to-date
  2. Log into your Portainer web UI
  3. Under Settings → App Templates, paste the below URL
  4. Head to Home → App Templates, and the list of apps will show up
  5. Select Kener, fill in any config options, and hit Deploy

Template Import URL

https://raw.githubusercontent.com/Lissy93/portainer-templates/main/templates.json
Show Me demo
Original stackfile

The compose file this template deploys, straight from its repo:

services:
  kener:
    image: rajnandan1/kener:latest
    restart: unless-stopped
    ports:
      - "${KENER_PORT:-3700}:3000"
    environment:
      ORIGIN: ${KENER_URL:?Set the address you'll open it on}
      KENER_SECRET_KEY: ${KENER_SECRET:?Set a secret key}
      REDIS_URL: redis://redis:6379
    volumes:
      - kener-data:/app/database
    depends_on:
      redis:
        condition: service_healthy

  redis:
    image: redis:7-alpine
    restart: unless-stopped
    volumes:
      - redis-data:/data
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5

volumes:
  kener-data:
  redis-data:

Or deploy it directly from the source:

git clone https://github.com/NotAFlightRisk/portainer-templates-extras
cd portainer-templates-extras
docker compose -f apps/kener/compose.yml up -d

More install options in our documentation, or see rajnandan1/kener for app-specific guidance.

Container Documentation

kener Documentation

Kener: Open-source Node.js status page system, batteries included

redis Documentation

Redis is the world’s fastest data platform for caching, vector search, and NoSQL databases.

Check the logs first

Nine times out of ten the logs tell you exactly what went wrong.

  • In Portainer, go to Containers, click the container, then Logs. Or run docker logs <container>
  • Exit codes help too: 137 means killed, usually out of memory. 126 or 127 means the command inside the image is broken.

Image won't pull

Test the pull directly on the host: docker pull rajnandan1/kener:latest

  • "manifest unknown" means the tag no longer exists. This template uses latest, so try pinning a specific version instead.
  • "toomanyrequests" is the Docker Hub rate limit. Log in with docker login to raise it.
  • "no space left on device" means a full disk. Reclaim space with docker system prune

"exec format error"

This means the image was built for a different CPU architecture than your server.

  • Check yours with uname -m: x86_64 is amd64, aarch64 is arm64. Raspberry Pi and other ARM boards are the usual culprits.

Container keeps restarting

The unless-stopped restart policy relaunches the app after every crash, so the real error can scroll past.

  • Check the logs right after a restart, the last few lines before it died are the useful ones.
  • Get the exit code with docker inspect <container> --format '{{.State.ExitCode}}'
  • Still stuck? Redeploy once with the restart policy set to no so the failure stays visible.

Stack won't deploy

Compose stacks fail fast on small mistakes, and Portainer shows the reason just above the editor.

  • YAML only accepts spaces for indentation, a single tab breaks the whole file.

Raise an issue

Found something which isn't working as it should? Here's how to report it.

A Compose stack

Kener is a Compose stack, a set of containers (2 of them) defined in one file and brought up together by Portainer, then started and stopped as a single app.

The services

This stack is built from 2 containers that run side by side. Here's each one, with the image it runs and anything it waits for first:

  • kener runs rajnandan1/kener:latest, starts after redis
  • redis runs redis:7-alpine

Volumes

A volume is where Kener keeps its files so they survive an update or a restart. Without one, anything it saves would sit inside the container and vanish the moment it's recreated. This template mounts:

  • /app/database kept in the kener-data volume Docker manages
  • /data kept in the redis-data volume Docker manages

Environment variables

Environment variables are the settings you hand over when you deploy, things like a password or a timezone. Kener takes 3 of them, and 2 need a value before it'll start properly:

  • ORIGIN, needs a value
  • KENER_SECRET_KEY, needs a value
  • REDIS_URL, defaults to redis://redis:6379

Restart policy

The restart policy here is unless-stopped, so Docker restarts Kener after a crash or reboot, but leaves it off when you stop it on purpose. You can change this on the deploy screen. The choices are no (never restart), on-failure (only after a crash), unless-stopped (restart unless you stop it), and always (bring it back no matter what).

Networking

Portainer puts these services on one shared private network, so they can find each other by name (like kener) while only the ports above are open to you.

Platform

The platform is linux, the kind of system the container is built to run on. Docker and Portainer handle this on a normal Linux server.

Open source license

Kener is open source, released under the MIT license. In plain terms the code is out in the open, so you're free to run it and change it to fit what you need.

Portainer app templates

Zooming out, this whole page comes from a Portainer app template: a short recipe telling Portainer how to set Kener up. Add the template list to Portainer once, then deploying Kener is a click rather than a wall of config.