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@RossKukulinski
Kuberentes 101 for Developers
Ross Kukulinski

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Welcome
Ross Kukulinski
Kubernetes/DevOps Consultant
Node.js Evangelism WG / RethinkDB Community
Introduction to CoreOS - O’Reilly Media
@RossKukulinski on Twitter/GitHub

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Welcome
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Today’s Roadmap
• Introduction to Kubernetes
• Ship to production
Just kidding!

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Container Orchestration
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If your architecture looks like this
Manage your containers with Ansible, Docker
Swarm, Amazon ECS, etc.

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If your architecture looks like this
You need orchestration help

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Orchestration Overview
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Container Orchestration
• Schedule containers to physical/virtual machines
• Restart containers if they stop
• Provide private container network
• Scale up and down
• Service discovery

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Kubernetes 101
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Kubernetes 101
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Kubernetes is an open source system for
automating deployment, scaling, and
management of containerized
applications.

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Kubernetes 101
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Kubernetes Orchestration
• Schedules containers to physical machines
• Service discovery & load balancing
• Horizontal application scaling
• Automated rollouts & rollbacks
• Secret and configuration management
• Storage orchestration
• … and a whole lot more!

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Kubernetes Terminology
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Kubernetes 101
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Terminology - Node
• Is a worker machine in Kubernetes that runs your containers
• Node may be a VM or physical machine
• Each Node has the services necessary to run Pods

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Kubernetes 101
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Terminology - Master
• A special Node in Kubernetes that manages the cluster state
• Usually does not run your containers
• Runs necessary services to manage cluster , backed by etcd

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Kubernetes 101
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Terminology - Namespaces
• Provide a virtual cluster backed by the same physical cluster
• Namespaces provide a scope for names. Names of resources
need to be unique within a namespace, but not across
namespaces.
• Divide cluster resources between multiple uses
• If not specified, you’re using the ‘default’ namespace

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Kubernetes 101
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Terminology - Pods
• Smallest deployable unit of computing
• Group of one or more containers
• Containers within a Pod share a cluster-accessible IP address
(and localhost)
• Containers within a Pod of access to shared volumes

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Kubernetes 101
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Terminology - Replica Sets
• Ensures that a specified number of Pod “replicas” are running
at one time
• If there are too many, it will kill some Pods
• If there are too few, it will start more

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Kubernetes 101
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Terminology - Deployments
• Provide declarative updates for Pods/Replica Sets
• Manages one or more Replica Sets
• Primary mechanism for interacting with Pods!
• Automated rollouts and rollbacks :)

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Kubernetes 101
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Terminology - Services
• An abstraction which defines a logical set of Pods
• Provides a mechanism for accessing them
• 3 types: ClusterIP, NodePort, LoadBalancer

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Demo Gods… we salute you!

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Workshop Resources
github.com/rosskukulinski/
kubernetes-101-for-devs

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http://cloudytimemachine.com

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27. Thank you.
Ross Kukulinski
ross@kukulinski.com
@rosskukulinski