Forecastle

Table of Contents:

• Introduction
  • Problem
  • Solution
• Features
• Admin Guide
  • Vanilla Manifests
  • Helm Charts
  • Configuration
    • NamespaceSelector
    • Custom Apps
    • Example Config
  • Scaling with Multiple Instances
• User Guide
  • Ingresses
  • ForecastleApp CRD
  • Automatically discover URL's from Kubernetes Resources
• Developer Guide
  • Bug Reports & Feature Requests
  • Developing
• Help
  • Talk to us on Slack
• Changelog
• License
• About
  • Why name Forecastle

Introduction

Problem

• Finding and accessing applications on Kubernetes can be challenging without a central hub.
• It's essential to have a dynamic way to discover and list applications that are actively running on Kubernetes.
• Developers often need a streamlined portal to access essential tools like Jenkins, Nexus, Kibana, Grafana, and others.

Solution

Forecastle gives you access to a control panel where you can see your running applications and access them on Kubernetes.

Forecastle provides a unified control panel, serving as a convenient gateway to view and access your applications deployed on Kubernetes. Whether it's monitoring tools, CI/CD pipelines, or other applications, Forecastle brings them all to your fingertips in one central location.

Features

Forecastle boasts a range of functionalities designed to streamline the management and accessibility of applications in Kubernetes environments. Key features include:

1. Comprehensive App Listing: Forecastle aggregates and displays apps from all namespaces specified in the ConfigMap, providing a centralized view of your resources.

2. Search Functionality: Quickly locate specific applications with an intuitive search feature, enhancing user experience and efficiency.

3. Namespace Grouping: Apps are neatly organized and grouped by their respective namespaces, making navigation and management more straightforward.

4. Customizable Header: Tailor the look and feel of your Forecastle dashboard with configurable header options, including title customization and color schemes.

5. Support for Multiple Instances: Forecastle is designed to support multiple instances, accommodating varied and complex deployment scenarios.

6. Custom Apps Integration: Easily add non-Kubernetes or external applications to your dashboard for a more comprehensive overview of your tools and resources.

7. ForecastleApp CRD: Utilize the ForecastleApp Custom Resource Definition to dynamically add custom applications, further enhancing the dashboard’s flexibility.

8. Custom Grouping and URLs: Organize your applications into custom groups and assign specific URLs for tailored navigation and accessibility.

9. Detailed App Information: Each application comes with detailed information, offering insights and essential details at a glance.

Admin Guide

This section is intended for Administrators aiming to deploy Forecastle on their clusters. Forecastle offers flexible deployment options, accommodating both Kubernetes and OpenShift platforms with ease.

You have the choice of deploying Forecastle using traditional manifests or through Helm charts. Detailed instructions for both methods are provided below to guide you through the deployment process.

Vanilla Manifests

Step 1: Apply manifests

You can get Forecastle by running the following command on your cluster:

for Kubernetes:

kubectl apply -f https://raw.githubusercontent.com/stakater/Forecastle/master/deployments/kubernetes/forecastle.yaml

for OpenShift:

kubectl apply -f https://raw.githubusercontent.com/stakater/Forecastle/master/deployments/openshift/forecastle.yaml

Accessing the Dashboard

For Kubernetes environments, you can use the following port-foward command to access the Forecastle dashboard:

kubectl port-forward svc/forecastle 8080:8080

Please note that you would need to configure ingress to to access Forecastle from outside the cluster based on your cluster's ingress configuration.

For OpenShift environments, a default route is created for the Forecastle service. You can access the dashboard using the route URL.

oc get route forecastle

Step 2: Update configmap

Modify the namespaceSelector key in the Forecastle ConfigMap to list the namespaces you want Forecastle to monitor. For detailed instructions, see namespace selector configuration for instructions.

Helm Charts

You can use Helm to deploy Forecastle. Head over to the values.yaml to find configuration options.

helm repo add stakater-charts https://stakater.github.io/stakater-charts/
helm install forecastle stakater-charts/forecastle

Configuration

Forecastle simplifies the discovery and management of applications on Kubernetes and OpenShift. It utilizes specific annotations on ingresses and offers various configuration options for customization.

You can customize Forecastle using either a ConfigMap or the values.yaml file when deploying with Helm. Below are the configurable fields:

Field	Description	Default	Type
namespaceSelector	A fine grained namespace selector which uses a combination of hardcoded namespaces well as label selectors	any: true	NamespaceSelector
headerBackground	Background color of the header (Specified in the CSS way)	null	string
headerForeground	Foreground color of the header (Specified in the CSS way)	null	string
title	Title for the forecastle dashboard	"Forecastle - Stakater"	string
instanceName	Name of the forecastle instance	""	string
customApps	A list of custom apps that you would like to add to the forecastle instance	{}	[]CustomApp
crdEnabled	Enables or disables ForecastleApp CRD	true	bool

Detailed Configurations

NamespaceSelector

Selects namespaces for Forecastle to monitor, either by listing specific namespaces or using label selectors.

Field	Description	Default	Type
any	Boolean describing whether all namespaces are selected in contrast to a list restricting them	false	bool
labelSelector	Filter namespaces based on kubernetes metav1.LabelSelector type	null	metav1.LabelSelector
matchNames	List of namespace names	null	[]string

Note: If you specify both labelSelector and matchNames, Forecastle will take a union of all namespaces matched and use them.

Custom Apps

Allows adding non-Kubernetes or external apps to Forecastle. This is an extremely useful feature especially when your apps are distributed both on kubernetes and off it. You can pass an array of custom apps inside the config.

Field	Description	Type
name	Name of the custom app	String
icon	URL of the icon for the custom app	String
url	URL of the custom app	String
group	Group for the custom app	String
properties	Additional Properties of the app as a map	map[string]string
networkRestricted	Whether app is network restricted or not	bool

Example Configuration

Below is an example of how you might configure Forecastle using a combination of namespace selectors and custom apps:

namespaceSelector:
  labelSelector:
    matchLabels:
      component: redis
    matchExpressions:
      - {key: tier, operator: In, values: [cache]}
  matchNames:
  - test
title:
headerBackground:
headerForeground: "#ffffff"
instanceName: "Hello"
crdEnabled: false
customApps:
- name: Hello
  icon: http://hello
  url: http://helloicon
  group: Test
  properties:
    Version: 1.0

This configuration demonstrates how to set namespace selectors, customize the header's appearance, enable or disable the CRD feature, and add a custom app with specific properties.

Scaling with Multiple Instances

Forecastle's design allows for running multiple instances, providing scalability and flexibility in diverse environments. Here's how you can effectively scale Forecastle.

Deploying Multiple Instances

Basic Deployment: To run multiple Forecastle instances, deploy each instance in a separate namespace. Specify a list of namespaces for each instance to monitor ingresses.

Configuring Named Instances for Enhanced Flexibility

Named Instance Configuration: For greater control over which applications are displayed in specific instances (irrespective of their namespaces), configure each Forecastle instance with a unique name using the instanceName setting in the Forecastle configuration.

Controlling Application Display Across Instances

Application-Specific Instance Display: After naming your instances, use the forecastle.stakater.com/instance annotation on your ingresses. This annotation dictates which application appears in which Forecastle instance.

Multiple Instance Display: It's possible for a single application (ingress) to appear in multiple Forecastle dashboards. For instance, if you have two instances named dev-dashboard and prod-dashboard, adding dev-dashboard,prod-dashboard in the ingress's instance annotation will ensure the application is visible on both dashboards.

Helm Deployment Considerations

Unique Naming in Helm: When deploying Forecastle instances via Helm, ensure each instance has a unique nameOverride value (default is forecastle). This step is crucial to avoid conflicts between global resources like ClusterRole and ClusterRoleBinding.

User Guide

This section is intended for Users aiming to use Forecastle in their Kubernetes environments.

Ingresses

Forecastle identifies applications through annotations added to Kubernetes ingresses. Here’s how you would add the necessary annotations:

Annotation	Description	Required
forecastle.stakater.com/expose	Add this with value true to the ingress of the app you want to show in Forecastle	true
forecastle.stakater.com/icon	Icon/Image URL of the application; An icons/logos/images collection repo Icons	false
forecastle.stakater.com/appName	A custom name for your application. Use if you don't want to use name of the ingress	false
forecastle.stakater.com/group	A custom group name. Use if you want the application to show in a different group than the namespace it is running in	false
forecastle.stakater.com/instance	A comma separated list of name/s of the forecastle instance/s where you want this application to appear. Use when you have multiple forecastle dashboards	false
forecastle.stakater.com/url	A URL for the forecastle app (This will override the ingress URL). It MUST begin with a scheme i.e., http:// or https://	false
forecastle.stakater.com/properties	A comma separate list of key:value pairs for the properties. This will appear as an expandable list for the app	false
forecastle.stakater.com/network-restricted	Specify whether the app is network restricted or not (true or false)	false

ForecastleApp CRD

Another way Forecastle enhances your ability to dynamically integrate applications is by using ForecastleApp Custom Resource Definition (CRD). This feature adds a layer of flexibility, allowing you to separate the application configuration from the Ingress settings and Forecastle's own configuration.

Creating a ForecastleApp:

To create a ForecastleApp, use the following template as a guide. This configuration allows you to specify the app name, group, icon, URL, and additional properties:

apiVersion: forecastle.stakater.com/v1alpha1
kind: ForecastleApp
metadata:
  name: app-name
spec:
  name: My Awesome App
  group: dev
  icon: https://icon-url
  url: http://app-url
  networkRestricted: false
  properties:
    Version: "1.0"
  instance: "" # Optional

Automatically discover URL's from Kubernetes Resources

ForecastleApp CRD supports automatic URL discovery from certain Kubernetes resources, such as:

• Ingress: Ensures the application's URL is automatically retrieved from the Ingress resource in the same namespace.

To utilize this feature, add the urlFrom field to your ForecastleApp specification like so: Please note that the type of resource that you want to discover has to be in the same namespace as the ForecastleApp CR.

apiVersion: forecastle.stakater.com/v1alpha1
kind: ForecastleApp
metadata:
  name: app-name
spec:
  name: My Awesome App
  group: dev
  icon: https://icon-url
  urlFrom: # This is new
    ingressRef:
      name: my-app-ingress

This configuration instructs Forecastle to fetch the app URL directly from the specified Ingress resource, simplifying deployment and configuration.

Note: To use the CRD feature, ensure it's enabled by setting crdEnabled: true in the Forecastle configuration or by enabling it in the Helm chart.

Developer Guide

Bug Reports & Feature Requests

Please use the issue tracker to report any bugs or file feature requests.

Developing

PRs are most welcome. In general, we follow the "fork-and-pull" Git workflow.

1. Fork the repo on GitHub.
2. Clone the project to your own machine.
3. Commit changes to your own branch.
4. Push your work back up to your fork.
5. Submit a Pull request so that we can review your changes.

NOTE: Be sure to merge the latest from "upstream" before making a pull request!

Help

Got a question? File a GitHub issue.

Talk to us on Slack

Join and talk to us on the #tools-imc channel for discussing Forecastle

Changelog

View our closed Pull Requests.

License

Apache2 © Stakater

About

Why the name "Forecastle"?

The term "Forecastle" originates from maritime vocabulary, referring to the upper deck of a ship situated at the bow, just in front of the foremast. Historically, it's a place from where sailors navigate and observe the vast sea ahead.

In the context of our project, we've adopted this name as a metaphor for the role Forecastle plays in the world of Kubernetes. Just like the ship's forecastle, our Forecastle acts as a central observation and control panel. It gives users a comprehensive view of all their running applications on Kubernetes, specifically those marked with a designated annotation. Forecastle is designed to be your Kubernetes dashboard, providing a clear view and easy access to your deployed applications, much like a sailor surveying the sea from the ship's bow.

Forecastle is maintained by Stakater. Like it? Please let us know at [email protected]

See our other projects or contact us in case of professional services and queries on [email protected]