From pets to cattle, the way of Kubernetes

Containers are the past, orchestration of containers is the future. In this talk you are going to learn the basic definitions that you will find in a Kubernetes cluster and how to deploy your applications there.

You are going to move your app from running it in a simple container to do a rolling-update in several machines and with 0 downtime.

Don't be scared, there will be loads of examples that will help to understand the abstractions that people from Kubernetes came up with.

Transcript

1. From pets to cattle The way of Kubernetes
2. @agonzalezro
3. 1. Why the title? 2. Containers 3. Kubernetes concepts 4. Kubernetes architecture 5. Questions
6. ContainerS
8. chroot Jails 1982 2000 2001 2006 2008 2009 2013 2014 Linux VServer Generic Process Containers cgroups LXC Kernel namespaces Mesos Docker Kubernetes Rocket
9. “Former” architecture Infrastructure Host Operating System Hypervisor Guest OS Guest OS Guest OS Bin/Libs Bin/Libs Bin/Libs App #1 App #2 App #3
10. Docker architecture Infrastructure Host Operating System Hypervisor Guest OS Guest OS Guest OS Bin/Libs Bin/Libs Bin/Libs App #1 App #2 App #3 Docker engine
11. Dockerfile FROM ubuntu:16.04 MAINTAINER Docker RUN apt-key adv --keyserver ... RUN echo "deb http://repo.mongodb.org/... RUN apt-get update && apt-get install -y mongodb-org RUN mkdir -p /data/db EXPOSE 27017 ENTRYPOINT ["/usr/bin/mongod"]
12. ExamplE
13. NGINX MySQL Ghost
14. NGINX MySQL Ghost Containers
15. NGINX MySQL Ghost Containers Registry
16. Nodes
17. Nodes NGINX MySQL Ghost
18. Nodes NGINX MySQL Ghost NGINX MySQL Ghost
20. OrchestratioN
21. OrchestratioN with Kubernetes
22. –k8s documentation “Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.”
23. Orchestration • Schedule containers in physicals machines • Control lifecycle of those containers • Private network & load balancing • Horizontal scaling • Rollouts & rollbacks • Extras: service discovery, storage, secrets…
24. NGINX MySQL Ghost Pods
25. NGINX MySQL Ghost Pods Secret
26. ++ • Volumes (persistent and not)! • ConfigMaps • LivenessProbe and ReadinessProbe
27. NGINX MySQL Ghost • layer=web • env=production • v=v1_final_this_works_final2 • layer=db • backend=mysql Labels
28. NGINX MySQL Ghost Replica Sets
29. NGINX MySQL Ghost NGINX Ghost Replica Sets
30. Replica Set++ • Autoscalable!
 (based on Heapster)
31. NGINX MySQL Ghost NGINX Ghost Deployment
33. NGINX Ghost NGINX Ghost Service
34. NGINX NGINX Service Ingress Service Service
35. Deployments
36. Namespaces
38. Special pets/cases • DaemonSet • PetSet
39. Kubernetes master Node #1 Node #1 Kubernetes master Node #1 Container engine Container #1 Container #2 … Kube proxy Kubelet etcd
41. YAMLs apiVersion: extensions/v1beta1 kind: Deployment metadata: name: ghost labels: k8s-app: "ghost" spec: replicas: 1 template: metadata: labels: k8s-app: "ghost" spec: containers: - name: “nginx” ...
42. Sweet End Jobs &
 Scheduled jobs
43. Thanks! @agonzalezro