Background workers

A background worker is a process that runs all the time and has no port.

A background worker has no port. The proxy sends no traffic to it.

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A background worker does work that no request waits for. Examples are queue consumers, bots and stream processors.

Ferry does not give a PORT variable to a worker.

When a worker is healthy

A new instance is healthy when it runs for 5 seconds after its start. See Health checks.

Terminal

ferry create mailer --type worker --repo https://github.com/you/app --start-cmd "node worker.js"

--start-cmd is the command that starts the process. See Start command.

Private services

A private service has a port but no public URL. Only the private network reaches it.

Cron jobs

A cron job is a command that runs on a schedule, then exits.