Ledger

Ledger allows you to record versions of applications you manage. It gives insights in your team's deployment habits.

flowchart TB
  subgraph ledger [ ]
    ui(server-ui) --> server(server-api)
    admin(admin-cli) --> server
    server --> database[(Database)]
  end
  subgraph external
    client(client-cli) ---> server
    agent(kubernetes-agent) ---> server
    curl([curl]) ---> server
  end

Installation

helm repo add ledger https://stenic.github.io/ledger/
helm install ledger --namespace ledger ledger/ledger

Check the helm chart for more configuration options.

Collecting versions

Ledger lets you choose how you want to record versions.

• Client CLI
• Kubernetes agent
• Direct GraphQL API

Client CLI

The client CLI simplifies the interaction with the API. This requires a TOKEN to be used, you can use an OIDC token or generate a long-lived token using the admin CLI.

curl -o ledger https://[ledger-installation]/download
chmod +x ledger
./ledger client new-version app env version

Kubernetes Agent

It will collect changes to Deployments and Statefulsets. When a change is detected, the agent will use the image name without the repository as the application and the tag as the version. This can be overwritten by using setting one or more of the annotations below.

Aannotation	Description	Default
ledger.stenic.io/location	Overwrite the location	Set by the agent
ledger.stenic.io/environment	Overwrite the environment	Resource namespace
ledger.stenic.io/application	Overwrite the application name	The image without the repository

GraphQL API

Communication between any system is possible using the GraphQL API. This requires a TOKEN to be used, you can use an OIDC token or generate a long-lived token using the admin CLI.

export TOKEN=ey...

export version=1.2.3

curl 'https://ledger.development.tbnlabs.be/query' \
 -H "authorization: Bearer $TOKEN" \
  -H 'content-type: application/json' \
  --data-raw "{\"query\":\"mutation { createVersion( input: { application:\\\"$version\\\", environment:\\\"test\\\", version:\\\"$version\\\" } ) { id } }\"}" \
 --compressed \
 --insecure

Administration

kubectl exec -ti svc/ledger-server /app/ledger admin -h