Sentinel is an open-source, cloud-agnostic, self-hosted Platform-as-a-Service that can easily deploy and manage multiple database-backed applications and update those applications via canary deployments.

Sentinel is installed as an NPM package and controlled via a custom Command Line Interface. It uses Terraform and Ansible to provision and manage infrastructure in the cloud, Docker Swarm Mode for container orchestration, and Traefik for request routing, load balancing, and sticky sessions.

Sentinel uses canary deployments to safely update existing applications, and provides monitoring via Prometheus, Node Exporter, and Grafana for analyzing the health and performance of the hosted applications.