Liveness and readiness checks for Flask running in a container. Useful when running flask in a Kubernetes environment.

flask_checks.py

@app.route('/healthz/live', methods=['GET'])
def healthz_live():
    return 'ok\n'

@app.route('/healthz/ready', methods=['GET'])
def healthz_ready():
    if ready:
        return 'ok\n'
    else:
        return 'not ready\n', 503