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Infrastructure Management Using Kubernetes

Infrastructure Management Using Kubernetes

Managing Infrastructure using Kubernetes. A brief introduction about Kubernetes, containers and their differences from standard virtualization

Omer Dawelbeit

November 23, 2017
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  1. Infrastructure Management
    Using Kubernetes
    Dr. Omer Dawelbeit | @omerio | +OmerDawelbeit
    Annual Day 2017
    Slides: https://goo.gl/HGgX5V

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  2. About me ‘omerio’
    ● Co-founder GDG Reading, UK. 2015 - 2016
    ● Co organizer GDG Cloud Emirates, UAE. 2017 - Now
    ● Google Developer Expert (Cloud)
    ● Open Source contributor (ecarf.io, cloudex.io)
    Google
    ● 16+ years as Tech Consultant (UK, Middle
    East & South East Asia)
    ● PhD Computer Science, University of
    Reading (Cloud + Big Data)
    ● Blog at omerio.com, Tweets @omerio
    Reading, UK
    Dubai, UAE

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  3. Content
    ● What is Kubernetes?
    ● What is a container?
    ● Virtualization Overview
    ● Where can I run it?
    ● What can Kubernetes do and
    why use it?
    ● Kubernets Cluster Overview

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  4. Kubernetes & Containers

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  5. What is Kubernetes?
    Greek for “Helmsman”; also the root of the words
    “governor” and “cybernetic”
    • An Open Source system that runs and manages
    containers
    • Inspired and informed by Google’s experiences
    and internal systems
    • Supports multiple cloud and bare-metal
    environments
    • Supports multiple container runtimes (Docker,
    Rocket)
    • 100% Open source, written in Go
    Manage applications, not machines

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  6. What is a container?
    ● Lightweight environment
    ● Static application environment
    ● No external dependencies
    ● Application isolation
    ● Reusable, runnable artifacts
    ● Loosely coupled
    ● Portable
    Run containers on bare metal already: https://www.youtube.com/watch?v=coFIEH3vXPw

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  7. Virtualization Overview
    Live migration

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  8. Virtual Infrastructure

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  9. Containers vs. VMs
    Typical VMs
    Containers on bare metal
    Containers on VMs

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  10. Containers Orchestration

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  11. Where can I run it?
    Laptop to high-availability multi-node cluster
    Hosted or self managed
    On-Premise or Cloud (GCP, AWS, Azure, Bluemix, ..)
    Bare Metal or Virtual Machines
    Most OSes (inc. RedHat Atomic, Fedora, CentOS)
    Or just a bunch of Raspberry PIs
    Many options, See Matrix for details
    Kubernetes Cluster Matrix: http://bit.ly/1MmhpMW

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  12. What can Kubernetes do and why use it?
    ● co-locating helper processes,
    ● mounting storage systems (volumes),
    ● application health checking,
    ● replicating application instances,
    ● horizontal auto-scaling,
    ● load balancing,
    ● rolling updates,
    ● and resource monitoring.
    ● manage applications, not machines,
    ● better resource utilisation and scheduling,
    ● better application performance monitoring
    (APM),
    ● consolidated logging and reporting,
    ● ease of deployment management,
    Source:
    Google

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  13. Cluster Overview
    ● Pods
    ● Containers
    ● Labels
    ● Replication Controllers*
    ● Services
    ● Nodes
    ● Kubernetes Master
    http://omerio.com/2015/12/18/learn-the-kubernetes-key-concepts-in-10-minutes/
    A Deployment that configures a ReplicaSet is
    now the recommended way to set up replication

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  14. Pods
    ● Smallest deployable unit
    ● Scheduled to nodes
    ● Hosts containers and volumes
    ● Ephemeral
    ● Each has its own routable IP (no NAT)
    ● Containers in a pod
    ○ Tightly coupled
    ○ Share IP, port and IPC namespaces
    ○ Talk to each other through localhost
    http://blog.kubernetes.io/2015/06/the-distributed-system-toolkit-patterns.html

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  15. Pods Questions
    ● How to persist data across container restarts?
    ● How to create multiple copies of a Pod?
    ● How can containers reference each other reliably?

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  16. Labels
    ● Key/value pairs (tier=frontend,
    app=myapp)
    ● Metadata with semantic meaning
    ● Membership identifier (services & rc)
    ● Queryable by Selectors (grouping)

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  17. Replication Controllers / ReplicaSet
    ● Keeps Pods running
    ● Ensures N copies of Pods are
    running
    ● Provides direct control of Pods
    ● Uses a Pod template
    ● Determines constituent Pods
    using Label Selector

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  18. Replication Controllers

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  19. Services
    ● An abstraction
    ● Logical grouping of Pods
    ● Determines constituent Pods
    using Label Selector
    ● Load balancing between
    constituent Pods
    ● Gets a stable virtual IP, port &
    DNS name

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  20. A few more...
    ● Volumes
    ● Secrets
    ● Namespaces
    ● Resource based scheduling
    ...
    spec:
    containers:
    - name: locust
    image: gcr.io/rabbit-skateboard/guestbook:gdg-rtv
    resources:
    requests:
    memory: "300Mi"
    cpu: "300m"
    limits:
    memory: "300Mi"
    cpu: "300m"

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  21. Kubernetes is Open Source
    We want your help!
    http://kubernetes.io
    https://github.com/kubernetes/kubernetes
    Slack: #kubernetes-users
    @kubernetesio

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  22. Thank you
    Stay in touch
    Google+: +OmerDawelbeit
    Twitter: @omerio
    LinkedIn: OmerDawelbeit
    Blog: omerio.com
    Slides: https://goo.gl/HGgX5V

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