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Docker and Kubernetes
(an intro)
Arnon Rotem-Gal-Oz
What is Docker?
Linux Containers
What’s isolated?
So what is Docker then?
What are the basics of the Docker system?
Source
Code
Repository
Dockerfile
For
A
Docker Engine
Docker
Container
Image
Registry
Build
Docker
Host 2 OS (Linux)
ContainerA
ContainerB
ContainerC
ContainerA
Push
Search
Pull
Run
Host 1 OS (Linux)
http://www.slideshare.net/dotCloud/docker-intro-november
Changes and Updates
Docker Engine
Docker
Container
Image
Registry
Docker Engine
Push
Update
Bins/
Libs
App
A
AppΔ
Bins/
Base
Container
Image
Host is now running A’’
Container
Mod A’’
AppΔ
Bins/
Bins/
Libs
App
A
Bins/
Bins/
Libs
App
A’’
Host running A wants to upgrade to A’’.
Requests update. Gets only diffs
Container
Mod A’
http://www.slideshare.net/dotCloud/docker-intro-november
Work on my machine…
What is Kubernetes?
Is a Distributed Operating System for your code
1. OS as an
extended machine
2. OS as a Resource
Manager
What we get
• Scaling
• Discovery
• Load balancing and routing
• Monitoring
• Configuration
Azure/AWS/Google/AliCloud
all have managed Kubernetes offerings
Pod
• A deployment unit
• one or more containers
• Shared storage volumes
• Shared IP (i.e. access via localhost) and port space
• Deployed together (co-located, co-scheduled)
• Ephemeral (reschedule  new instance, not rerunning an ”old” instance)
network
Init container 2
Init container 1
container 1 container 2
POD
Side-car pattern (edge component)
• Job
• CronJob
• StatefulSet
• DeamonSet
• Deployment
• Replicaset
Service
• Set of Pods
• An access policy (session affinity, port,
external port etc.)
• Provides a stable endpoint for other
services
http://kubernetes.io/docs/user-guide/services/
Declare
desired state
(via yaml)
https://threadreaderapp.com/thread/1067537816324845569.html
Operators:
Deploy Apps
on K8s
And there’s a lot more…

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Docker & Kubernetes intro

Editor's Notes

  1. Platform for managing Linux Containers API for image management Builds on cgroup and namespacing Built in Go Includes an image specification and container specification (namespaces, filesystem resources etc.) (DockerFile)
  2. Container = OS level virtualization - a lightweight VM Not duplicating the whole OS for each ”machine”
  3. Namespaces (mounts, PIDs etc.) Cgroups (CPU, Memory, Disk) Chroot (file system) Seccomp (computation)
  4. Platform for managing Linux Containers API for image management Builds on cgroup and namespacing Built in Go Includes an image specification and container specification (namespaces, filesystem resources etc.) (DockerFile)
  5. Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
  6. Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
  7. Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
  8. Kubelet – Node agent Holds PodSpecs Performs probes on containers ExecAction: Executes a specified command inside the Container. The diagnostic is considered successful if the command exits with a status code of 0. TCPSocketAction: Performs a TCP check against the Container’s IP address on a specified port. The diagnostic is considered successful if the port is open. HTTPGetAction: Performs an HTTP Get request against the Container’s IP address on a specified port and path. The diagnostic is considered successful if the response has a status code greater than or equal to 200 and less than 400. Kube controller Node controller: Responsible for noticing and responding when nodes go down. Replication controller: Responsible for maintaining the correct number of pods for every replication controller object in the system. Endpoints controller: Populates the Endpoints object (that is, joins Services & Pods). Service Account & Token controllers: Create default accounts and API access tokens for new namespaces. Cloud controller – api to specific clouds
  9. Init containers run in a chain to completion (must end) one after the other Can be used to ensure pre-requisites are met Can have different permissions that the containers that run in the pod Lifecycle, livenessProbe, readinessProbe,startupProbe
  10. Extend the event loop