App22

The most useful web application to perform labs and tests in a container environment!

Features

With App22 you can do the following:

• Get container system information /sys
• Get environment variables /env
• Get request headers /headers
• Simulate custom response delay and status code /response
• Simulate system failure /crash
• Experiment with various deployment strategies by setting custom version /version
• Experiment with Kubernetes probes /healthz /healthz/toggle
• Test SQL database failover and replication /database
• Test Kubernetes PersistentVolume, ConfigMap, and Secret /cat
• Test Prometheus scraping and alerts /metrics
• Test API Gateway and Service Mesh with ToDo List API /tasks

... and much more. Take a look at the Swagger documentation on /doc.

Run

$ docker run --rm --name app22 -p 5000:5000 teymurgahramanov/app22:latest

Configuration

Default configuration config.py can be overwritten using environment variables:

• APP22_VERSION
  Custom version string. Useful for testing various deployment strategies.
• APP22_DEBUG
  Enable debug mode using 1. Disabled by default.
• APP22_DB_URL
  Set database connection string. Example:
  postgresql://app22:app22@localhost:5432/app22
  https://docs.sqlalchemy.org/en/20/core/engines.html#engine-configuration.
• APP22_DB_OPTIONS
  A dict of arguments to pass to database engine. Example:
  '{"pool_timeout": 5,"connect_args": {"sslmode": "require"}}' https://docs.sqlalchemy.org/en/20/core/engines.html#engine-creation-api.