Introduction
What is Kubernetes
Kubernetes (k8s) - popular container orchestrator
Container orchestration - make many servers act like one
Released by Google in 2015, maintained by large community
Runs on top of Docker (usually) as a set of APIs in containers
Provides API / CLI to manage containers across servers
Many clouds provide it for you
Many vendors make a "distribution" of it
Why Kubernetes
Orchestration: Next logical step in journey to a faster DevOps
First, understand why you may need orchestration, as not every solution needs orchestration
Number of servers + change rate = benefits of orchestration
Then, decide which orchestrator
If Kubernetes, decide which distribution
cloud or self-managed (Docker Enterprise, Rancher, OpenShift, Canonical, VMWare PKS)
don't usually need pure upstream version of k8s from Github
Kubernetes or Swarm
Kubernetes and Swarm are both container orchestrators
Boths are solid platforms with vendor backing
Swarm: easier to deploy / manage
Kubernetes: More features and more flexibility
Understand both and know your requirements
Advantages of Swarm
Comes with Docker, single vendor platform
Easiest orchestrator to deploy / manage yourself
Follows 80/20 rules (somewhat), 20% of features compared to k8s cover 80% of use cases
Run anywhere Docker does
local, cloud, datacenter
ARM, Windows, 32-bit, etc
Advantages of Kubernetes
Clouds will deploy / manage Kubernetes for you
Infrastructure vendors are making their own distributions
Widest adoptions and community
Flexible: covers widest set of use cases
"Kubernetes first" vendor support
"No one ever got fired for buying IBM"
picking solutions isn't 100% rational
trendy, will benefit your career
CIO / CTO checkbox
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