#DOCKER KUBERNETES TUTORIAL SOFTWARE#

Kubernetes provides scripts to create a cluster with several operating systems and cloud/virtual providers: Vagrant (useful for local testing), Google Compute Engine, Azure, Rackspace, etc. The configuration files used in the example are available in GitHub, and the Docker images are available as csanchez/jenkins-swarm, for the master Jenkins, extending the official Jenkins image with the swarm plugin, and csanchez/jenkins-swarm-slave, for each of the slaves, just running the slave service on a JVM container. The swarm slaves connect to the Jenkins master on startup and become available to run Jenkins jobs. Jenkins is configured with the Jenkins swarm plugin to run a Jenkins master and multiple Jenkins slaves, all of them running as Docker containers across multiple hosts. The example app used in this article is the Jenkins CI server, in a typical master-slaves setup to distribute the jobs. If a replication controller is defined with 3 replicas, Kubernetes will try to always run that number, starting and stopping containers as necessary. If a container is killed, it will try to start a new one. When you define a pod, Kubernetes tries to ensure that it is always running. Kubernetes is defined by states, not processes. kubecfg: The command line client that connects to the master to administer Kubernetes.A service maps the ports of the containers running on pods across multiple minions to externally accesible ports. Service: A definition that allows discovery of services/ports published by containers, and external proxy communications.The containers are scheduled across multiple minions. Replication controller: Defines how many pods or containers need to be running.Pod: Defines a collection of containers tied together that are deployed in the same minion, for example a database and a web server container.Minion: Each of the multiple Docker hosts with the Kubelet service that receive orders from the master, and manages the host running containers.Multi master configuration is on the roadmap. Master: Server with the Kubernetes API service.The command line tools connect to the API endpoint in the master, which manages and orchestrates all the minions, Docker hosts that receive the instructions from the master and run the containers. The Kubernetes architecture is defined by a master server and multiple minions. Kubernetes is still at a very early stage, which translates to lots of changes going into the project, some fragile examples, and some cases for new features that need to be fleshed out, but the pace of development, and the support by other big companies in the space, is highly promising.

#DOCKER KUBERNETES TUTORIAL SOFTWARE#

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Docker kubernetes tutorial