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Docker Local Scheduler

New

Subcommands introduced in 0.12.12

scheduler-docker-local:report [<app>] [<flag>]              # Displays a scheduler-docker-local report for one or more apps
scheduler-docker-local:set <app> <key> (<value>)            # Set or clear a scheduler-docker-local property for an app

New

Introduced in 0.12.0

Dokku natively includes functionality to manage application lifecycles for a single server using the scheduler-docker-local plugin. It is the default scheduler, but as with all schedulers, it is set on a per-application basis. The scheduler can currently be overridden by running the following command:

dokku config:set node-js-app DOCKER_SCHEDULER=docker-local

As it is the default, unsetting the DOCKER_SCHEDULER config variable is also a valid way to reset the scheduler.

dokku config:unset node-js-app DOCKER_SCHEDULER

Usage

Disabling chown of persistent storage

The scheduler-docker-local plugin will ensure your storage mounts are owned by either herokuishuser or the overridden value you have set in DOKKU_APP_USER. You may disable this by running the following scheduler-docker-local:set command for your application:

dokku scheduler-docker-local:set node-js-app disable-chown true

Once set, you may re-enable it by setting a blank value for disable-chown:

dokku scheduler-docker-local:set node-js-app disable-chown

Implemented Triggers

This plugin implements various functionality through plugn triggers to integrate with Docker for running apps on a single server. The following functionality is supported by the scheduler-docker-local plugin.

  • check-deploy
  • core-post-deploy
  • post-app-clone-setup
  • post-create
  • post-delete
  • pre-deploy
  • pre-restore
  • scheduler-deploy
  • scheduler-docker-cleanup
  • scheduler-inspect
  • scheduler-logs-failed
  • scheduler-logs
  • scheduler-retire
  • scheduler-run
  • scheduler-stop
  • scheduler-tags-create
  • scheduler-tags-destroy

Supported Resource Management Properties

The docker-local scheduler supports a minimal list of resource limits and reservations. The following properties are supported:

Resource Limits

  • cpu: (docker option: --cpus), and is specified in number of CPUs a process can access.
  • memory: (docker option: --memory) and should be specified with a suffix of b (bytes), k (kilobytes), m (megabytes), g (gigabytes)
  • memory-swap: (docker option: --memory-swap) and should be specified with a suffix of b (bytes), k (kilobytes), m (megabytes), g (gigabytes)

Resource Reservations

  • memory: (docker option: --memory-reservation) and should be specified with a suffix of b (bytes), k (kilobytes), m (megabytes), g (gigabytes)