Infrastructure Management Using Kubernetes

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

Transcript

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. Services
    

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

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

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