Kubernetes-757 Inaugural kickoff meeting Dec 17-2019

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Welcome!
$kubectl apply -f meetup.yaml -n 757
757

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Thanks to our Sponsor

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$ > whoami
● Matthew Bach
● Sr. Specialist Solution Architect @Red Hat
○ Middleware, OpenShift, Ansible
● Gopher / Pythonista
● Favorite Open Source Tool: Ansible
@matthewjbach
@mbach04

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$ > whoami
● Brandon Gulla
● Cloud Solutions Architect @ Booz Allen
○ Does cloudy things for federal customers
● Home Automation Enthusiast
● Spaces > Tabs
● Favorite Open Source tool: Home-Assistant
@gullatec
@bgulla

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What is the CNCF?
Cloud Native Compute Foundation
“The Cloud Native Computing Foundation builds sustainable ecosystems and fosters
communities to support the growth and health of cloud native open source software.”

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K8s history
- v1.0 release July 2015
- Started as an internal project at Google (borg) and is now maintained by the CNCF
- Kubernetes means helmsman or Captain in Greek
- Abbreviated as k8s

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K8s enables
- Container orchestration
- Distributed computing
- Resource scaling
- Infrastructure abstraction
- Modern Devops workflows

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Kubernetes Master Node Components
- etcd
- kube-controller-manager
- kube-scheduler
- kube-apiserver

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Kubernetes Worker Node Components
- kubelet
- kube-proxy
- container runtime

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*an SDN overlay connects all nodes

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Minishift / Container Development Kit
- Single hyperconverged OpenShift 3.11.x node
- Runs on MacOS, Linux, Windows
- Requires a hypervisor: VirtualBox, HyperV, KVM
- Full featured OpenShift / K8s cluster to start developing with
- Based on the CNCF compliant Kubernetes distro: OpenShift
- Includes a container registry, OpenShift Console, templates, S2i, Loggins, Metrics,
RBAC, Jenkins...Many productive abstractions
Download: https://developers.redhat.com/products/cdk/overview

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Installing minishift -
First download the VM from: https://developers.redhat.com/products/cdk/hello-world
$ mkdir -p ~/bin
$ cp ~/Downloads/minishift ~/bin
$ chmod +x ~/bin/minishift
$ echo 'export PATH=$PATH:$HOME/bin' >> ~/.bashrc
$ export PATH=$PATH:$HOME/bin
$ minishift setup-cdk
...
$ minishift start
...
$ minishift console
...
$ minishift stop
$ minishift delete

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Demo time

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K3s - Lightweight Kubernetes
● Single Binary (~50mb)
● Small memory footprint (~300mb)
● Designed for the edge (or your raspberry pi)
● Uses sqlite (multi-master!) instead of etcd
● Uses containerD as default but can use Docker easily
● Fully CNCF certified
● v1.0 GA’ed Nov 19, 2019
○ 10k+ Github Stars
○ 500k+ Downloads
○ 800k+ Installs

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K3s - Architecture
See? It’s just Kubernetes without all the bloat.

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Installing k3s -
> curl -sfL https://get.k3s.io | sh -
# Check for Ready node, takes maybe 30 seconds
> sudo k3s agent --server https://myserver:6443 --token ${NODE_TOKEN}
> k3s kubectl get node
> echo “profit!”

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Installing k3s- k3sup.dev
● Automated installer for k3s
● Pronounced “Ketchup”
● Written by Alex Ellis @alexellisuk
● Bootstraps install process via ssh
● Includes helm chart installer
○ > k3sup app install nginx-ingress
● Makes the easy…. easier.

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k3s - Live Demo
● K3s installation on fresh centos 7 VM (x86)
via k3sup
● Heterogeneous k8s cluster consisting of:
○ 1 x86 VM
○ 2 Raspberry Pi 3b
○ 4 Raspberry Pi 4 (4GB)
● Rancher UI
● Daemonset deployment with node-label
targeting to deploy a UPS-Power
aggregator with InfluxDB/Grafana
integration
●

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Demo time

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Kind
- Ultra lightweight
- Kubernetes in docker (Kind) architecture style
- Appropriate for quick prototyping
- Intended for testing of Kubernetes 1.11+
- Requires docker on your host
https://kind.sigs.k8s.io/

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Installing Kind
#MacOS / Linux
> curl -Lo ./kind
https://github.com/kubernetes-sigs/kind/releases/download/v0.6.1/kind-$(uname)-amd64
> chmod +x ./kind
> mv ./kind /some-dir-in-your-PATH/kind
> kind create cluster
#Windows
> curl.exe -Lo kind-windows-amd64.exe
https://github.com/kubernetes-sigs/kind/releases/download/v0.6.1/kind-windows-amd64
> Move-Item .kind-windows-amd64.exe c:some-dir-in-your-PATHkind.exe
> kind create cluster
# Or with Package managers
# MacOS
> brew install kind
# Windows
> choco install kind

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Demo time

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Other ways to get started
We showed you a few, but there are several options out there:
- Minikube (single VM converged K8s)
- Code Ready Containers (OpenShift 4.2+ on a single VM)
- Deploy a single node cluster locally, and schedule workloads to the master
`kubectl taint nodes $(hostname) node-role.kubernetes.io/master:NoSchedule-`
- Docker Kubernetes desktop
- microk8s