Kubernetes Intro

Kuberentes 101 from Montreal Kuberentes Meetup. Kubernetes Birthday.

Transcript

1. cloudops.com @cloudops_ K8s Meetup #1 & Birthday Party July 26, 2016
2. • Kubernetes Meetup Manifesto • Kubernetes 101 • User story Agenda
3. Page Thanks to our Sponsors 3 Contact us if you would like to be a sponsor!
4. K8s Meetup #1 Manifesto
5. Page Kubernetes Montréal - Plans for 2016 • Collaborate with Docker Montreal & other related meetups • Quarterly meetups • Looking for sponsors, organizers, speakers (reach us via meetup.com) • Create a logo, social media #kubernetes • Planning hands-on workshops and hackathons 5
6. Page Kubernetes Montréal - Topics • Kubernetes and ecosystem • Container ecosystem: Docker and Rkt • Networking, storage and scheduling for K8s • Using Kubernetes with CM, CI/CD • Unique use cases and how Kubernetes helped your team/company • Deploying and using Kubernetes in production in the enterprise • Containerized App Development • PaaS, IaaS integrations • Cool new tech and how it can be used with Kubernetes • Kubernetes + IoT • Day 2 Operations (monitoring, troubleshooting, upgrades) of K8s cluster • Orchestrating multi-host, multi-container, distributed applications • Using Kubernetes to manage and secure your application infrastructure
7. Page Major Container Events in 2016 7 • ContainerCon 2016: August 22-24 (Toronto) • OpenStack Summit 2016: October 25-28 (Barcelona) ◦ Vote for our talk on Container Orchestration ◦ https://lnkd.in/euCHUnT (search for Ayrat) • KubeCon 2016: November 8-9 (Seattle)
8. A little data from the K8s Maker
9. Page 9
10. 1.2 • Deployments • DaemonSets • New UI • Simplified Deployments • Automated Cluster Management • Improved Scale 1.3 • Legacy application support • Cluster Federation • More nodes • In-cluster IAM • Scheduled jobs • Cluster autoscaling • Public cloud dashboard
11. Page 11 v1.3
12. Page
13. Page 13
14. Page 14
15. Kubernetes 101 History, Architecture
16. cloudops.com @cloudops_ Page Who am I? 16 Ayrat Khayretdinov • OpenStack Engineer at CloudOps • Part of SIG-Openstack Kubernetes community • Organizing OpenStack and K8s Meetup in Montreal
17. Page 17 Why containers?
18. Page Dependency Matrix Hell 18 Dev 1 Laptop Dev 2 Laptop QA Stage Production OS OS X Windows Debian Debian Debian Frontend nginx (homebrew) nginx (download) nginx (apt-get) nginx (apt-get) nginx (apt-get) Services php (homebrew) php (download) php (apt-get) php (apt-get) php (apt-get) Database mysql (download) mysql (download) mysql (apt-get) mysql (apt-get) mysql (apt-get) Logs /usr/local/etc/nginx/logs/ C:\nginx-1.9.5\logs /var/log/nginx/ /var/log/nginx/ /var/log/nginx/
19. Page 19
20. Page 20 Docker
21. Page What is Docker again? 21 • • • •
22. Page 22 Dependency Matrix Hell Solved Dev 1 Laptop Dev 2 Laptop QA Stage Production OS Frontend Services Database Logs
23. Page I’m “Dockerized”, Now What? 23
24. Page 24 Kubernetes • • • •
25. Page Kubernetes Origin 25 … • • • • • • • •
26. Page A Toolkit for Running Containerized Distributed Systems in Production 26 Co-locating helper processes Mounting storage systems Distributing secrets Application health checking Replicating application instances horizontal auto-scaling Naming and discovery Load balancing Rolling updates resource Monitoring Log access and ingestion support for debugging
27. Page Container Runtime 27 Not all containers are Docker containers Kubernetes support rkt containers runtime start from v 1.3 In devel: hyper_ (Hyper.sh), LXC AVOID LOCK-IN
28. Page 28 Architecture
29. Page 29 Architecture
30. Page 30
31. Page Storage 31
32. Page How to consume Kubernetes ? 32 • From Scratch - anywhere • Public Cloud ◦ GCE, Amazon, Azure • Private Cloud ◦ OpenStack (Murano, Magnum) ◦ CloudStack • Hosted • On premises VMs ◦ VMware • Local-machine Solutions ◦ MiniKube
33. Page 33
34. Demo 1 • MiniKube • Kubectl • K8s Dashboard
35. Page Storage 35
36. Page Concept: Pods 36 Pod Git Synchronizer Node.js App Container Volume Consumers git Repo Logical Application Can be used to group multiple containers & shared volumes Containers within a pod are tightly coupled Shared namespaces • Containers in a pod share IP, port and IPC namespaces • Containers in a pod talk to each other through localhost Ephemeral
37. Page Pod Networking (across nodes) 37 Pods have IPs which are routable Pods can reach each other without NAT Even across nodes No Brokering of Port Numbers Many solutions Flannel, Weave, OpenVSwitch, Cloud Provider, Calico 10.1.2.0/24 10.1.1.2 10.1.2.106 10.1.3.0/24 10.1.3.45 10.1.3.17 10.1.3.0/24
38. Demo 2 Creating Pod
39. Page Working with configuration files Kubernetes supports two different file formats YAML and JSON. Each format can describe the same function of K8s: • YAML The YAML format is very simple with less syntax rules. Refer to http://www.yaml.org/spec/1.2/spec.html The following example uses the YAML format to set up the nginx pod: • JSON The JSON format is also simple and easy to read by humans, but more program-friendly. Because it has data types (number, string, Boolean, and object), it is popular to exchange the data between systems. Refer to http: //json.org/ • SWAGGER There is an alternative way, because Kubernetes is also using swagger (http://swagger.io/) to generate the REST API; therefore, you can access swagger-ui via http://<kubernetes-master>:8080/swagger-ui/. Example of configs: https://github.com/kubernetes/kubernetes/tree/master/examples 39
40. Page Concept: Labels 40 • Arbitrary metadata • Attached to any API object • Generally represent identity • Queryable by selectors – think SQL ‘select ... where ...’ • The only grouping mechanism – pods under a ReplicationController – pods in a Service – capabilities of a node (constraints) Example: “phase: Dev”
41. Page Concept: Selectors 41
42. Page Selectors 42
43. Page Selectors
44. Page Concept: Services 44 • A group of pods that act as one == Service – group == selector • Defines access policy – load balanced (from CloudProvider) – NodePort (Minikube) – ClusterIP (interal only) - - - -
45. Page Services - - - -
46. Page Concept: Deployments 46 ... Deployment drives current state towards desired state. E.g: I want 3 replicas of my pod Deployment manages replica changes for you • stable object name • updates are configurable, done server-side • kubectl edit or kubectl apply Aggregates stats Can have multiple updates in flight
47. Page Replication Controllers 47 Replication Controller - Name = “nifty-rc” - Selector = {“App”: “Nifty”, "Phase": "Dev", "Role": "FE"} - PodTemplate = { ... } - NumReplicas = 4
48. Page Replication Controllers 48 - -
49. Page Replication Controllers 49 - -
50. Page Replication Controllers 50 - -
51. Page Replication Controllers 51 - -
52. Feature: Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Pod hello Node Pod hello Service
53. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Pod hello Node Pod hello Service Pod goodbye
54. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Pod hello Node Pod hello Service Pod goodbye
55. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Pod hello Node Pod hello Service Pod goodbye
56. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Pod hello Service Pod goodbye Pod goodbye
57. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Pod hello Service Pod goodbye Pod goodbye
58. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Pod hello Service Pod goodbye Pod goodbye
59. Rollout Node 1 Pod hello Pod hello Node Pod hello Node Node Service Pod goodbye Pod goodbye
60. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Service Pod goodbye Pod goodbye Pod goodbye
61. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Service Pod goodbye Pod goodbye Pod goodbye
62. Rolling Update Node 1 Pod hello Pod hello Node Pod hello Node Node Service Pod goodbye Pod goodbye Pod goodbye
63. Rolling Update Node 1 Pod hello Pod hello Node Node Node Service Pod goodbye Pod goodbye Pod goodbye
64. Demo 3 (All together) • Pods • Services • Deployments
65. User Stories: CRIM Ericsson Mnubo
66. Page User Story 66
67. Page Referenence 67 1. Container clusters with Kubernetes -Tim Hockin (Container Camp 2015)