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Orbiter and how to extend Docker Swarm


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Gianluca has been working on a project called Orbiter, an open source tool designed to be an easy to maintain autoscaler for Docker Swarm. He will present an overview about Docker Swarm & demo this project and take your questions and suggestions.

Published in: Technology
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Orbiter and how to extend Docker Swarm

  1. 1.
  2. 2. Gianluca Arbezzano @gianarb Building clouds at InfluxDB (SRE)
  3. 3. Why? ● To create a use case around metrics, InfluxDB and Docker. ● Docker Swarm at the moment doesn’t provider autoscale capabilities. ● To design an application easy to manage and well integrated in Docker Swarm.
  4. 4. Orbiter is a general-purpose multi vendor autoscaler
  5. 5. Orbiter is a general-purpose multi vendor autoscaler Orbiter is a Docker Swarm autoscaler
  6. 6. swarm cluster manager get metrics: ● cadvidor ● telegraf ● …. alert: ● custom ● kapacitor ● alert manager
  7. 7. Why Docker Swarm doesn’t have autoscaling? ● I don’t know. ● As you can see the architecture required is not small. ● Probably it will have autoscaling at some point.
  8. 8. Orbiter is designed to be Only-Swarm ● To make it easy to start ● To remove abstractions ● Because less is more! cit unknown but for sure a lazy person
  9. 9. What does it? ● It lists all your services and it gets only who has label orbiter=true ● Expose and HTTP API to trigger up and down scale event ○ curl -X POST -v http://$(IP):8081/v1/orbiter/handle/autoswarm/stack_micro/up ○ curl -X POST -v http://$(IP):8081/v1/orbiter/handle/autoswarm/stack_micro/down ● It uses Docker Swarm Api to keep in sync the managed services ● You can configure a service via label orbiter.up=3, orbiter.donw=2, orbiter.cooldown = 2
  10. 10. Requirement: ● Deploy it in a manager.
  11. 11. Deploy it as service in Docker Swarm version: '3' services: orbiter: image: gianarb/orbiter command: daemon ports: - 8081:8000 volumes: - /var/run/docker.sock:/var/run/docker.sock deploy: placement: constraints: - node.role == manager mode: replicated replicas: 1
  12. 12. How Orbiter communicate with Swarm func NewSwarmProvider(c map[string]string) (autoscaler.Provider, error) { var p autoscaler.Provider client, err := docker.NewEnvClient() if err != nil { logrus.WithField("error", err).Warn("problem to communicate with docker") return p, err } else { logrus.Info("Successfully connected to a Docker daemon") } p = SwarmProvider{ dockerClient: client, } return p, nil }
  13. 13. Scale a service - 1.Find the service service, _, err := p.dockerClient.ServiceInspectWithRaw(ctx, serviceId, types.ServiceInspectOptions{ InsertDefaults: true, }) if err != nil { logrus.WithFields(logrus.Fields{ "error": err.Error(), "provider": "swarm", }).Debugf("Service %s didn't scale. We didn't get it from docker.", serviceId) return err } filters := filters.NewArgs() filters.Add("service", serviceId) tasks, err := p.dockerClient.TaskList(ctx, types.TaskListOptions{Filters: filters}) if err != nil { … } err = p.isAcceptable(tasks, target, direction)
  14. 14. Scale a service - 2.Update the Spec spec := service.Spec var ptrFromSystem uint64 base := p.calculateActiveTasks(tasks) if direction == true { ptrFromSystem = uint64(base + target) } else { ptrFromSystem = uint64(base - target) } spec.Mode.Replicated.Replicas = &ptrFromSystem _, err = p.dockerClient.ServiceUpdate(ctx, serviceId, service.Version, spec, types.ServiceUpdateOptions{}) if err != nil {...}
  15. 15. Background job to sync services with Docker services, err := dockerClient.ServiceList(ctx, types.ServiceListOptions{}) if err != nil { logrus.WithField("error", err).Debug("Bad communication with Docker.") return } prov, _ := provider.NewSwarmProvider(map[string]string{}) for _, service := range services { s, err := getAutoscalerByService(prov, service.Spec.Annotations) if err != nil { continue } c.Autoscalers[fmt.Sprintf("autoswarm/%s", service.Spec.Annotations.Name)] = s }
  16. 16. Is orbiter just a wrapper on Docker Swarm API? Let’s put that in a cooler way. Orbiter provides easy to use rest API to scale your services up and down.
  17. 17. T-shirt time
  18. 18. Demo
  19. 19. Thanks a lot