FerryDocs
Concepts

Self-healing

Ferry compares what must run with what runs, and repairs the difference without your help.

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Actual state: DockerDesired state2 instancesReconcilereach 10 secondsInstance 1runsInstance 2runs

The database of Ferry has the desired state: 2 instances must run.

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Ferry keeps the in its database: services, live deploys, numbers of instances and datastores. The compares it with the in Docker.

You do not restart a crashed app. You do not remove old containers.

See the state of a service

Terminal
ferry status api

In this section

What the reconciler doesWhen it runs, and the four steps of one pass.When a container crashesOne crash and its repair, step by step.If ferryd stopsYour apps continue to run. What stops, and what does not.Shut down ferrydThe three steps of a graceful shutdown.

The change feed

The change feed is one stream that tells each change on the server.

What the reconciler does

In each pass, the reconciler makes the containers of a service equal to its live deploy.

On this page

See the state of a serviceIn this section