Compass

Compass is a release management tool (specific to SOON__) that handles managing namerd finagle delegation tables, mapping logical names to Kubernetets services deployed via Helm.

Goals

• Manage HTTP/1.1 and gRPC services - these live in specific namerd namespaces
• Easy management of mapping service logical names (Host name for example) to Kubernetets services
• A UI appropriate for Humans to use (potentially interactive)
• Ability to run as part of automation for CI/CD
• gRPC Client / Server model - allowing for other UI's to be created

CLI

Below are some initial CLI thoughts:

Managing Apps

To manage an application we would create on using the upsert command:

compass manage --logical-name frontend --namespace http --description "Frontend application"

This would take 3 arguments:

• --logical-name: A unique logical name for the application
• --namespace: The namerd namespace the delegation table entry should be managed for this app
• --description: An optional app description

Routing to a Kubernetets service

To update a services delegation table entry to map the logical name to a Kubernetes service we would use the route command. This would instantly update the the applications delegation table entry to route requests for the logical name to a Kubernetes service.

The labels on Kubernetes services are key to aid in this management, a logical-name label must exist on the service, for version support a version label must also exist on the service.

apiVersion: v1
kind: Service
metadata:
  name: frontend-v1-2-3
  labels:
    app: helm-name
    logical-name: frontend
    version: v1.2.3
spec:
  type: NodePort
  selector:
    app: helm-name
    version: v1.2.3
  ports:
    - name: http
      port: 4010

This would take the following arguments:

• --logical-name: The application logical name e.g frontend
• --version: Optional version used to lookup the kubernetets service name
• --service: Optional specific kubernetets service name if known upfront

If neither --service or --version are provided an interactive UI will be displayed showing the availible servies to route too.

compass route --logical-name frontend --version v1.2.3
compass route --logical-name frontend --service frontend-v1-2-3
compass route --logical-name frontend # spawns an interactive ui

Development

Dependencies

protoc is required to generate go code from .proto files.

Download the latest protoc release for your OS from https://github.com/google/protobuf/releases and follow the readme.txt.

make targets

• make protoc: runs protoc against the _proto directory
• make migrations: builds migrations into the application code
• make ensure: runs dep esnure
• make test: runs the test suite
• make compass: builds a compass binary in the _bin directory - CGO dynamically linked
• make needle: builds a needle binary in the _bin directory - CGO dynamically linked
• APP=needle|compass make static: builds a static binary for needle or compass in the _bin directory
• APP=needle|compass make image builds a docker image for needle or compass