Kubernetes 101 - GDG Cloud Vancouver

Kubernetes 101 - GDG Cloud Vancouver

Transcript

1. Kubernetes 101 #k8sbday #gdgcv @Vikram_Tiwari @gdgvancouver
2. 2 2 What’s in this for you...
3. 3 3 SlackGuest Slack4U2!
4. 4 The App (Monolith) nginx monolith
5. 5 The App (Microservices) nginx hello auth
6. 6 6 Packaging and Distributing Apps
7. 7 Dependency Matrix Dev 1 Laptop Dev 2 Laptop QA Stage Production OS ? ? ? ? ? Frontend ? ? ? ? ? Services ? ? ? ? ? Database ? ? ? ? ? Logs ? ? ? ? ?
8. 8 Dependency Matrix 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/
9. 9 Virtual Machines Hypervisor OS OS OS
10. ‹#› @kubernetesio
11. 11 Container Host OS Containers
12. 12 Docker Containers FROM alpine:3.1 MAINTAINER Vikram Tiwari <vikram@omniinc.com> ADD monolith /usr/bin/monolith ENTRYPOINT ["monolith"]
13. 13 Dependency Matrix Dev 1 Laptop Dev 2 Laptop QA Stage Production OS Frontend Services Database Logs
14. 14 14 But that's just one machine! Discovery Scaling Security Monitoring Configuration Scheduling Health
15. 15 Kubernetes Manage applications, not machines Open source, open API container orchestrator Supports multiple cloud and bare-metal environments Inspired and informed by Google’s experiences and internal systems
16. 16 16 Kubernetes Concepts Cattle > Pets No grouping Modular Control Loops Network-centric Open > Closed Simple > Complex Legacy compatible
17. 17 17 Cattle vs Pets
18. 18 Cattle vs Pets Cattle • Has a number • One is much like any other • Run as a group • If it gets ill, you make hamburgers Pet • Has a name • Is unique or rare • Personal Attention • If it gets ill, you make it better
19. 19 19 Desired State
20. 20 Desired States ./create_docker_images.sh ./launch_frontend.sh x 3 ./launch_services.sh x 2 ./launch_backend.sh x 1
21. 21 Desired States ./create_docker_images.sh ./launch_frontend.sh x 3 ./launch_services.sh x 2 ./launch_backend.sh x 1
22. 22 Desired States There should be: 3 Frontends 2 Services 1 Backend
23. 23 23 Employees, not Children
24. 24 Children vs Employees Child • Go upstairs • Get undressed • Put on pajamas • Brush your teeth • Pick out 2 stories Employee • Go get some sleep
25. 25 25 Pods
26. 26 Pods Logical Application • One or more containers and volumes • Shared namespaces • One IP per pod Pod nginx monolith NFS iSCSI GCE 10.10.1.100
27. 27 27 Health checks
28. 28 Monitoring and Health Checks Node Kubelet Pod Pod app v1
29. 29 Monitoring and Health Checks Hey, app v1... You alive? Node Kubelet Pod app v1 app v1
30. 30 Monitoring and Health Checks Node Kubelet Nope! Pod app v1 app v1
31. 31 Monitoring and Health Checks OK, then I’m going to restart you... Node Kubelet Pod app v1 app v1
32. 32 Monitoring and Health Checks Node Kubelet Pod
33. 33 Monitoring and Health Checks Node Kubelet Pod app v1
34. 34 Monitoring and Health Checks Node Kubelet Hey, app v1... You alive? Pod app v1
35. 35 Monitoring and Health Checks Node Kubelet Yes! Pod app v1
36. 36 36 Secrets
37. 37 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet secret $ kubectl create secret generic tls-certs --from-file=tls/
38. 38 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet pod $ kubectl create -f pods/secure-monolith.yaml
39. 39 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet API Server Node Kubelet Pod Pod
40. 40 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet API Server Node Kubelet Pod Pod secret
41. 41 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet API Server Node Kubelet Pod Pod /etc/tls secret
42. 42 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet Node Kubelet Pod Pod /etc/tls /etc/tls 10.10.1.100 secret API Server
43. 43 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet API Server Node Kubelet Pod Pod /etc/tls nginx 10.10.1.100 secret
44. 44 44 Services
45. 45 Services Pod hello Service Pod hello Pod hello
46. 46 Services Persistent Endpoint for Pods Pod hello Service Pod hello Pod hello
47. 47 Persistent Endpoint for Pods • Use Labels to Select Pods Services Pod hello Service Pod hello Pod hello
48. 48 Labels Arbitrary meta-data attached to Kubernetes object Pod hello Pod hello labels: version: v1 track: stable labels: version: v1 track: test
49. 49 Labels selector: “version=v1” Pod hello Pod hello labels: version: v1 track: stable labels: version: v1 track: test
50. 50 Labels selector: “track=stable” Pod hello Pod hello labels: version: v1 track: stable labels: version: v1 track: test
51. 51 Services Persistent Endpoint for Pods • Use Labels to Select Pods • Internal or External IPs Pod hello Service Pod hello Pod hello
52. 52 52 Deployments
53. 53 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 1
54. 54 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 3
55. 55 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 3 Pod hello Pod hello
56. 56 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 3 Pod hello
57. 57 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 3 Pod hello Pod hello
58. 58 58 Rolling Updates
59. 59 Rolling Update Node1 Node3 Node2 ghost Pod app v1 Service ghost Pod app v1 Pod app v1
60. 60 Rolling Update Node1 Node3 Node2 ghost Pod app v1 Service ghost Pod app v1 Pod app v1 Pod app v2
61. 61 Rolling Update Node1 Node3 Node2 ghost Pod app v1 Service ghost Pod app v1 Pod app v1 Pod app v2
62. 62 Rolling Update Node1 Node3 Node2 ghost Pod app v1 Service ghost Pod app v1 Pod app v1 Pod app v2
63. 63 Rolling Update Node1 Node3 Node2 Service ghost Pod app v1 Pod app v1 Pod app v2
64. 64 Rolling Update Node1 Node3 Node2 Service ghost Pod app v1 Pod app v1 Pod app v2 Pod app v2
65. 65 Rolling Update Node1 Node3 Node2 Service ghost Pod app v1 Pod app v1 Pod app v2 Pod app v2
66. 66 Rolling Update Node1 Node3 Node2 Service ghost Pod app v1 Pod app v1 Pod app v2 Pod app v2
67. 67 Rolling Update Node1 Node3 Node2 Service Pod app v1 Pod app v2 Pod app v2
68. 68 Rolling Update Node1 Node3 Node2 Service Pod app v1 Pod app v2 Pod app v2 Pod app v2
69. 69 Rolling Update Node1 Node3 Node2 Service Pod app v1 Pod app v2 Pod app v2 Pod app v2
70. 70 Rolling Update Node1 Node3 Node2 Service Pod app v1 Pod app v2 Pod app v2 Pod app v2
71. 71 Rolling Update Node1 Node3 Node2 Service Pod app v2 Pod app v2 Pod app v2
72. 72 72 Recap
73. 73 Kubernetes Manage applications, not machines Open source, Open API container orchestrator Supports multiple cloud and bare-metal environments Inspired and informed by Google’s experiences and internal systems
74. 74 Container • Subatomic unit in Kubernetes • Can use Dockerfile just like you’re used to
75. 75 Pods Logical Application • One or more containers and volumes • Shared namespaces • One IP per pod Pod nginx monolith NFS iSCSI GCE 10.10.1.100
76. 76 Monitoring and Health Checks Hey, app v1... You alive? Node Kubelet Pod app v1 app v1
77. 77 Secrets and Configmaps Kubernetes Master etcd API Server Node Kubelet secret $ kubectl create secret generic tls-certs --from-file=tls/
78. 78 Services Persistent Endpoint for Pods • Use Labels to Select Pods • Internal or External IPs Pod hello Service Pod hello Pod hello
79. 79 Labels Arbitrary meta-data attached to Kubernetes object Pod hello Pod hello labels: version: v1 track: stable labels: version: v1 track: test
80. 80 Drive current state towards desired state Deployments Node1 Node2 Node3 Pod hello app: hello replicas: 3 Pod hello Pod hello
81. 81 Rolling Update Node1 Node3 Node2 ghost Pod app v1 Service ghost Pod app v1 Pod app v1 Pod app v2
82. 82 But wait there’s more. • Persistent disks • Logging & Monitoring • Node & Pod Autoscaling • Web UI • Jobs & Daemon Sets • Cluster Federation • Ingress
83. 83 Scalable Microservices with Kubernetes https://www.udacity.com/course/scalable-microservices-with-kubernetes--ud615
84. Thank you! (Additional resources in the slide notes below) Transition to CodeLab