Blazer Docker

A Docker image for Blazer

Getting Started

Pull the image:

docker pull ankane/blazer

Create database tables:

docker run -ti -e DATABASE_URL=postgres://user:password@hostname:5432/dbname ankane/blazer rails db:migrate

Run the web server:

docker run -ti -e DATABASE_URL=postgres://user:password@hostname:5432/dbname -p 8080:8080 ankane/blazer

Use URL-encoding for any special characters in the username or password. For databases on the host machine, use host.docker.internal as the hostname (on Linux, this requires Docker 20.04+ and --add-host=host.docker.internal:host-gateway).

Then visit http://localhost:8080.

Authentication

Add basic authentication with:

-e BLAZER_USERNAME=admin -e BLAZER_PASSWORD=secret

Or use a reverse proxy like OAuth2 Proxy.

Checks

TODO: SMTP instructions

Schedule checks to run (with cron, Heroku Scheduler, etc). The default options are every 5 minutes, 1 hour, or 1 day, which you can customize. For each of these options, set up a task to run.

docker run ... rake blazer:run_checks SCHEDULE="5 minutes"
docker run ... rake blazer:run_checks SCHEDULE="1 hour"
docker run ... rake blazer:run_checks SCHEDULE="1 day"

You can also set up failing checks to be sent once a day (or whatever you prefer).

docker run ... rake blazer:send_failing_checks

For Slack notifications, create an incoming webhook and set:

-e BLAZER_SLACK_WEBHOOK_URL=https://hooks.slack.com/...

Name the webhook “Blazer” and add a cool icon.

Customization

Create a blazer.yml file with:

# see https://github.com/ankane/blazer for more info

data_sources:
  main:
    url: <%= ENV["DATABASE_URL"] %>

    # statement timeout, in seconds
    # none by default
    # timeout: 15

    # caching settings
    # can greatly improve speed
    # off by default
    # cache:
    #   mode: slow # or all
    #   expires_in: 60 # min
    #   slow_threshold: 15 # sec, only used in slow mode

    # wrap queries in a transaction for safety
    # not necessary if you use a read-only user
    # true by default
    # use_transaction: false

    smart_variables:
      # zone_id: "SELECT id, name FROM zones ORDER BY name ASC"
      # period: ["day", "week", "month"]
      # status: {0: "Active", 1: "Archived"}

    linked_columns:
      # user_id: "/admin/users/{value}"

    smart_columns:
      # user_id: "SELECT id, name FROM users WHERE id IN {value}"

# create audits
audit: true

# change the time zone
# time_zone: "Pacific Time (US & Canada)"

# email to send checks from
# from_email: blazer@example.org

# webhook for Slack
# slack_webhook_url: <%= ENV["BLAZER_SLACK_WEBHOOK_URL"] %>

check_schedules:
  - "1 day"
  - "1 hour"
  - "5 minutes"

# enable anomaly detection
# note: with trend, time series are sent to https://trendapi.org
# anomaly_checks: prophet / trend / anomaly_detection

# enable forecasting
# note: with trend, time series are sent to https://trendapi.org
# forecasting: prophet / trend

# enable map
# mapbox_access_token: <%= ENV["MAPBOX_ACCESS_TOKEN"] %>

# enable uploads
# uploads:
#   url: <%= ENV["BLAZER_UPLOADS_URL"] %>
#   schema: uploads
#   data_source: main

Create a Dockerfile with:

FROM ankane/blazer

COPY blazer.yml /app/config/blazer.yml

And build your image:

docker build -t my-blazer .

Deployment

Health Checks

Use the /health endpoint for health checks. Status code 200 indicates healthy.

History

View the changelog

Contributing

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features

To get started with development:

git clone https://github.com/ankane/blazer-docker.git
cd blazer-docker
docker build -t ankane/blazer:latest .