Bakta-Web backend

Backend to schedule Bakta jobs on a Kubernetes cluster.

  

Concept

The Bakta-Web backend implements a simple job scheduling system for the Bakta-Web UI. It requires an S3 compatible object storage, a MongoDB and a Kubernetes cluster to run the jobs. Jobs can be submitted via an API. The API is defined using gRPC and pregenerated builds are available for Golang. In addition the API can be queried using a JSON-over-REST API that is generated from the gRPC definitions using grpc-gateway. The corresponding repositories can be found here:

• Bakta
• UI
• API
• Go-API
• JSON-over-REST Gateway

Deployment

Requirements

• S3-compatible object storage
• MongoDB
• Kubernetes-Cluster

Configuration

The backend is configured mainly via a config file that needs to be mounted into the running pod of the application using a config map. The secrets for accessing the MongoDB and the object storage are mounted as environment variables via Kubernetes secrets. In addition a properly configured service-account is required. An example configuration file can be found in config/config.yaml, kubernetes deployments files for the deployment can be found in the kube directory. The service-account requires basic CRUD rights on the batch/Job resource.

Configuration file

Parameter	Description
Objectstorage.S3.UserBucket	Bucket to store the input and output data
Objectstorage.S3.DBBucket	Bucket to store the bakta database
Objectstorage.S3.BaseKey	Key prefix to store the input and output data
Database.MongoHost	Hostname of the used MongoDB
Database.MongoDBName	Name of the used database inside MongoDB
Database.MongoUser	Username for MongoDB authentication
Database.MongoAuthSource	Authentication database
Database.MongoPort	Port of the MongoDB
UpdateService.Name	Servicename that handles the job status updates
UpdateService.Port	Serviceport that handles the job status updates
ExpiryTime	Defines how long a job should be kept around
JobContainer	Registry link to the job container
InCluster	Indicates if the app is running inside a cluster
Testing	Indicates if the bakta test db should be used

Environment variables

Parameter	Description
MongoPassword	Password for the MongoDB user
AWS_ACCESS_KEY_ID	S3 access key
AWS_SECRET_ACCESS_KEY	S3 secret key