Kubernetes for Docker Developers
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The document discusses the transition of developers to Kubernetes and containerization, highlighting the benefits of using containers for microservices, such as portability and faster development environments. It also outlines key Kubernetes concepts and capabilities, including self-healing, scaling, and load balancing. Additionally, practical Docker commands and resources for further learning about Kubernetes are provided.
Kubernetes for Docker Developers
- 2. Change History 1.0 - Great Indian Developer Summit
- 5. Our IT World Morphs @burrsutter developers.redhat.com
- 6. Your Journey to Microservices :-) Self-Service On-Demand Elastic Infrastructure (Cloud) Re-Org to DevOps Automation Puppet, Chef, Ansible CI & CD Deployment Pipeline & Containers One Microservice Silicon Valley DotCom Startup
- 8. Containers bring Big Wins for developers ● Highly Portable Packaging solution - for microservices, web apps ● Lightweight, Encapsulated OS abstraction - carry your OS with you ● Getting Started (docker run -it centos/wildfly) Instantly ● Dev Environments that more closely match Prod Environments ● Dev Environments that match OTHER Dev Environments (no more...but it works on my machine) ● No more waiting 3+ weeks for a VM to be provisioned by Ops just so you can run a series of tests @burrsutter developers.redhat.com
- 10. Docker High-Level architecture https://docs.docker.com/v1.9/engine/introduction/understanding-docker/ @burrsutter developers.redhat.com
- 11. Computer - Processor, RAM, Disk Operating System JVM, CRuby, V8, CLR Your Code .java/.class .py .js .rb .cs @burrsutter developers.redhat.com
- 12. Computer - Processor, RAM, Disk Host Operating System JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Virtual Machine - Guest OS Virtual Machine - Guest OS @burrsutter developers.redhat.com
- 13. Computer - Processor, RAM, Disk Host Operating System JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Virtual Machine - Guest OS Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Virtual Machine - Guest OS Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container JVM, CRuby, V8, CLR Your Code .java .py .js .rb .cs Container @burrsutter developers.redhat.com
- 14. For a Java Developer Have you ever had “/” vs “” break your app? (Unix to Windows) Or perhaps your app needed a unique version of a JDBC driver? Or had a datasource with a slightly misspelled JNDI name? Or received a patch for the JVM or app server that broke your code? @burrsutter developers.redhat.com
- 15. Your Stack Matters Server Hardware Operating System Application Server your.war Java Virtual Machine Custom Configuration Linux Kernel Version & Distribution Java 1.6.6_45 or Java 1.7.0_67 Weblogic 10.x.y, Tomcat 6.x.y, JBoss EAP 6.x.y JDBC driver, datasource, JMS queue, users @burrsutter developers.redhat.com
- 16. Email Requirements MyApp.war has been tested with the following On my Windows 7 desktop JDK 1.8.43 Tomcat 7.10 Configuration: Datasource: MySQLDS Tested with: mysql-connector-java-5.1.31-bin.jar @burrsutter developers.redhat.com
- 17. Email Requirements MyApp.war has been tested with the following On my Windows 7 desktop JDK 1.8.43 Tomcat 7.10 Configuration: Datasource: MySQLDS Tested with: mysql-connector-java-5.1.31-bin.jar Production Environment Red Hat Enterprise Linux 6.2 JRE 1.7.3 WebSphere 8.5.5 Oracle 9 @burrsutter developers.redhat.com
- 18. Container Guest OS Java App Server custom configuration FROM centos/wildfly COPY standalone.xml /opt/wildfly/standalone/configuration/ COPY mysql-connector-java-5.1.31-bin.jar /opt/wildfly/standalone/deployments/ COPY mysql-sample-ds.xml /opt/wildfly/standalone/deployments/ COPY myapp/target/your.war /opt/wildfly/standalone/deployments/ your.war dependencies @burrsutter developers.redhat.com Docker Magic
- 19. docker run is like magic docker run -it centos /bin/bash Or Via the CDK (http://developers.redhat.com/products/cdk/overview/) docker run -it rhel7 /bin/bash @burrsutter developers.redhat.com
- 20. docker pull mysql @burrsutter developers.redhat.com
- 22. ● High Availability ● Load-balancing ● Scaling ● Staying Up ● Persistent Storage Making Docker Ready @burrsutter developers.redhat.com
- 24. @burrsutter developers.redhat.com Master Node Node Logger Node Node Node Node Dev Ops api etcd scheduler controllers Kubernetes Cluster
- 25. @burrsutter developers.redhat.com Kubernetes Concepts Pod Replication Controller 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)
- 26. @burrsutter developers.redhat.com Pods A group of whales is commonly referred to as a pod and a pod usually consists a group of whales that have bonded together either because of biological reasons (i.e. a mother baring offspring and raising her child) or through friendships developed between two or more whales. In many cases a typical whale pod consists of anywhere from 2 to 30 whales or more. http://www.whalefacts.org/what-is-a-group-of-whales-called/
- 27. @burrsutter developers.redhat.com Key Kubernetes Capabilities ● Self-healing ● Horizontal Manual & Auto Scaling ● Automatic Restarting ● Scheduled across hosts ● Built-in load-balancer ● Rolling upgrades
- 28. 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
- 29. 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
- 30. 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
- 31. 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
- 32. kubectl get nodes kubectl get pods kubectl run mynode --image=burr/mynode:v1 --port=8000 kubectl logs mynode-kk605 kubectl expose rc mynode --type="LoadBalancer" kubectl scale rc mynode --replicas=3 kubectl rolling-update mynode --image=mynode --update-period=2s Kubernetes Commands @burrsutter developers.redhat.com