HA Kubernetes on Mesos / Marathon

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    21-Jan-2018
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Transcript of HA Kubernetes on Mesos / Marathon

  1. 1. Docker on Kubernetes
  2. 2. Thank you @planet for the snacks 22seven for the venue Blue Battleship for the drinks (^^^ shameless self promotion)
  3. 3. Actually Docker on Kubernetes on Mesos via Marathon in VirtualBox via Vagrant Provisioned with Chef
  4. 4. Relax and listen All the code and commands will be available online after the talk
  5. 5. What is Docker? According to Google: person employed in a port to load and unload ships.
  6. 6. Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in.
  7. 7. Why is this important? Creates a standard way to ship build artifacts Ships the exact binary the developer had
  8. 8.
  9. 9. So you have containers Now what? Lets deploy!
  10. 10. Where do you host them? Docker Hub (public, security) AWS ECR Private Docker registry
  11. 11. How do you deploy? Command line
  12. 12. High hardware utilization Idling systems wastes money
  13. 13. Ok, so lets spin up more Use each server for multiple services Forward the ports to the same on host Put a loadbalancer in front Pat back, just scaled horizontally
  14. 14. Issues How do the nodes in a service discover other ones to allow them to cluster?
  15. 15. Chef! (My new koolaid driven tool) Ansible is also cool, ask Tom
  16. 16. Erm, riiiiiiight Ive heard Mesos/Marathon can help with that
  17. 17. Are we there yet? I thought this talk was about Kubernetes
  18. 18. Kubernetes Good for spinning up pods Registering services Etcd event -> Update DNS
  19. 19. Pods Collection of Docker images that work together nginx + memcached Independent, no shared state Port inside container is mapped to host port
  20. 20. Pods Mortal, when they die, they are gone Sounds like something should watch them
  21. 21. Replication controller Monitors the pods Spins up or kills pods depending on replication count required Should be used for single pods
  22. 22. Pods If the run on some host somewhere, how do we find them?
  23. 23. Services Higher level abstraction Website doesnt care which instance, just looking for image processing service Has a port to pod port mapping
  24. 24. Port mapping Service registers with Etcd -> DNS Service port -> Pod port -> Container port Starting to get complicated myservice.etcd.local
  25. 25. Mesos / Marathon Good with scheduling tasks on nodes Monitors and restarts processes Assigns random ports to containers Allows resource constraints
  26. 26. Consul + nginx Consul raises events when service is registerd Consul-template -> generate nginx config Load balance 2x nginx for *.mydomain.com
  27. 27. Mesos + Kubernetes Easy, right?
  28. 28. What now? Vagrant + Virtualbox Chef them Sounds do-able
  29. 29. Vagrant Spin up 3 Ubuntu machines Provision with Chef
  30. 30. Eth0 vs Eth1 Chef Ohai reads eth0 Needs to be eth1 Vagrant Ohai plugin! Then it broke
  31. 31. Zookeeper Mesos Marathon Not too much pain
  32. 32. Kubernetes Lots of pain Build from source Build from source using Docker image Download binary
  33. 33. Kubernetes Specifically didnt choose to do single master example, you wouldnt run it like this in production
  34. 34. Kubernetes Watch Kelsey Hightowers youtubes
  35. 35. Kubernetes Really not so easy to set up as HA
  36. 36. Thank you @planet for the snacks 22seven for the venue Blue Battleship for the drinks (^^^ shameless self promotion)