TDC2018FLN | Trilha Containers - Kubernetes para usuarios Docker.
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This document discusses Kubernetes and container orchestration. It begins with an introduction to containers and their advantages. It then introduces Kubernetes as a container orchestrator that can manage multiple containers across a cluster. The rest of the document explains key Kubernetes concepts like pods, replication controllers, services, labels, and volumes. It also briefly discusses deployment strategies and provides an overview of a sample application to demonstrate Kubernetes.
TDC2018FLN | Trilha Containers - Kubernetes para usuarios Docker.
- 2. Rafael Benevides Director of Developer Experience at Red Hat Apache DeltaSpike P.M.C benevides@redhat.com @rafabene Java Certifications: SCJA / SCJP / SCWCD / SCBCD / SCEA JBoss Certifications: JBCD / JBCAA Red Hat Certifications: OpenShift / Containers / Ansible Other Certifications: SAP Netweaver / ITIL / IBM Software Quality
- 4. @rafabene Why do you want to run your application inside containers?
- 5. @rafabene ● Lightweight footprint and minimal overhead, ● Portability across machines, ● Simplify DevOps practices, ● Speeds up Continuous Integration, ● Empower Microservices Architectures. ● Isolation Container Advantages Container Engine
- 6. @rafabene A way to run a Linux container: $ docker run -d <image-name> A single and isolated Linux process running in a single machine
- 7. @rafabene DevOps challenges for multiple containers ● How to scale? ● How to avoid port conflicts? ● How to manage them in multiple hosts? ● What happens if a host has a trouble? ● How to keep them running? ● How to update them? ● Where are my containers? Node Node Logger Node Node Node Node
- 8. @rafabene Greek for “Helmsman”; also the root of the word “Governor” (from latin: gubernator) ● Container orchestrator ● Supports multiple cloud and bare-metal environments ● Inspired by Google’s experience with containers ● Open source, written in Go Manage applications, not machines Meet Kubernetes
- 9. @rafabene Version 1.7 Hosted on GitHub 1000+ contributors 52,000+ commits 25,000+ GitHub stars Red Hat HP IBM Mesosphere Microsoft Project Partners CoreOS Pivotal SaltStack VMWare http://kubernetes.io/ https://github.com/kubernetes/kubernetes Open Source community
- 10. Master API Server Service Layer VirtualPhysical Private Public Persistent Storage Node Node Logger Node Node Node Node Dev Ops SCM (Git/Svn) CI/CD Automation Routing Layer Registry SDN Overlay Network Controllers - Scheduler - Replication - Services - Builds - Routes - Deployment Kubernetes OpenShift - Deployments - Builds - ImageStreams
- 11. @rafabene developers.redhat.com Kubernetes Concepts Pod Replication Controller / Deployment Service Label One or More Containers Shared IP Shared Storage Volume Shared Resources Shared Lifecycle Ensures that a specified number of pod replicas are running at any one time Grouping of pods, act as one, has stable virtual IP and DNS name Key/Value pairs associated with Kubernetes objects (e.g. env=production)
- 12. @rafabene Concept: Pod ● Group of containers ● Live and die together ● Share: ○ IP ○ Secrets ○ Labels * ○ Volumes * * we will talk about these concepts later Labels Application Administrative console Log collector IP: 10.x.x.x Volume
- 13. @rafabene Concept: POD Defining a POD as YAML: apiVersion: v1 kind: Pod metadata: name: myPod labels: key: value spec: containers: - name: mysql image: username/image - name: phpMyAdmin image: username/image2 key: value myPOD mysql phpMy..
- 14. SCM (Git/Svn) Master API Server Service Layer VirtualPhysical Private Public Persistent Storage Node Node Logger Node Node Node Node Dev Ops CI/CD Automation Routing Layer Registry SDN Overlay Network Controllers - Scheduler - Replication - Services - Builds - Routes - Deployment Kubernetes OpenShift - Deployments - Builds - ImageStreams
- 15. SCM (Git/Svn) Master API Server Service Layer VirtualPhysical Private Public Persistent Storage Node Node Logger Node Node Node Node Dev Ops CI/CD Automation Routing Layer Registry SDN Overlay Network Controllers - Scheduler - Replication - Services - Builds - Routes - Deployment Kubernetes OpenShift - Deployments - Builds - ImageStreams
- 16. SCM (Git/Svn) Master API Server Service Layer VirtualPhysical Private Public Persistent Storage Node Node Logger Node Node Node Node Dev Ops CI/CD Automation Routing Layer Registry SDN Overlay Network Controllers - Scheduler - Replication - Services - Builds - Routes - Deployment Kubernetes OpenShift - Deployments - Builds - ImageStreams
- 17. @rafabene Concept: Replication Controllers / Deployment Defining a Deployment as YAML: apiVersion: v1 kind: Pod metadata: name: myPod labels: key: value spec: containers: - name: myPod image: username/image ports: - name: http containerPort: 8080 apiVersion: extensions/v1beta1 kind: Deployment metadata: name: myDeployment spec: replicas: 4 template: metadata: spec:
- 18. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 2.0 Everything in Kubernetes can have a label Node Logger Node NodeNode
- 19. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 2.0 Node Logger Node NodeNode
- 20. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 2.0 Node Logger Node NodeNode
- 21. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 2.0 Node Logger Node NodeNode
- 22. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 2.0 Node Logger Node NodeNode
- 23. @rafabene Concept: Labels App: Cool Env: Dev Version: 1.0 App: Cool Env: Dev Version: 2.0 App: Cool Env: Prod Version: 1.0 App: Cool Env: Prod Version: 2.0 Node Logger Node NodeNode
- 24. @rafabene Concept: Labels metadata: name: objectName labels: App: Cool Env: Dev Version: 1.0 Defining Labels as YAML: (can be placed in any object metadata) App: Cool Env: Dev Version: 1.0
- 25. @rafabene Node 2 POD App: Cool Env: Prod Version: 1.0 POD Service Labels selector: ● App=Cool ● Env=Prod IP: 172.x.x.x App: Nice Env: Prod Version: 1.0 Concept: Services Node 1 POD
- 26. @rafabene Concept: Services apiVersion: v1 kind: Service metadata: name: myService labels: ... spec: ports: - port: 80 targetPort: 80 selector: App: Cool Env: Prod Defining a Service as YAML: myService Labels selector: ● App=Cool ● Env=Prod IP: 172.x.x.x
- 27. @rafabene Using Environment variables: Using internal DNS: $ ping mysql Service discovery inside Kubernetes
- 29. @rafabene Admin Owned Users Owned Persistent Volume GCE PD AWS LB NFS GlusterFS Persistent Volume Claim POD Volume ● Admin provisions them, Users claim them ● High-level abstraction ● Pods can mount PVCs as Volumes Concept: Persistent Volumes
- 30. @rafabene Deployment Concept: Rolling Updates Pod Replication Controller Pod Pod Pod App: Cool Version: 1.0 Version: 1.0 Replicas: 4 Service Replication Controller Version: 2.0 Replicas: 1 PodPod Pod Pod App: Cool Version: 2.0 Version: 1.0 Replicas: 3 Version: 2.0 Replicas: 2 Version: 1.0 Replicas: 2 Version: 2.0 Replicas: 3 Version: 1.0 Replicas: 1 Version: 2.0 Replicas: 4
- 33. @rafabene
- 34. @rafabene Hello World Service - Greet Guestbook Service - Create Guestbook Service - Retrieve
- 35. @rafabene Lab infrastructure Hypervisor RHEL VM Image ● OpenShift ● Kubernetes ● Docker Container Development Kit http://developers.redhat.com/products/cdk/download/
- 36. @rafabene Kubernetes lab VERY IMPORTANT http://bit.ly/kubernetes-lab Follow me on the Setup environment section!
- 38. @RAFABENE