The document discusses multi-cluster management using Rancher. It begins with an introduction to Rancher and its features for managing Kubernetes clusters across different platforms. It then demonstrates how to install Rancher, add custom and AKS clusters, and deploy applications like WordPress using Rancher's catalog across different clusters. While Rancher provides a unified interface for multi-cluster management, the document notes some current limitations in integrating with AKS clusters.

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Multi-Cluster Management
with Rancher

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Kyohei Mizumoto(@kyohmizu)
C# Software Engineer
Interests
Docker/Kubernetes
Go
Security
whoami

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Target
People who:
haven't used Rancher
are interested in multi-cluster management

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Preferred
The basic knowledge of:
Docker
Kubernetes
Microsoft Azure

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Agenda
What is Rancher?
Get Started
Manage Clusters
Add Clusters
Deploy WordPress from Catalog

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What is Rancher?

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Container packaging and runtime
standard
Build container images from
Dockerfiles(IaC)
Distribute container images from
Docker registries
Docker

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Container orchestration standard
Manage resources as manifest
files(IaC)
OSS which CNCF hosts
(Graduated)
Kubernetes

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Container management platform
Open source software
Deliver Kubernetes as a
Service(KaaS)
Paid support
Rancher

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Features
GUI based management
Add clusters
Deploy resources using catalogs
Easy to start
No need to have in-depth knowledge of Kubernetes

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Run Kubernetes Everywhere
Create Kubernetes clusters with:
Rancher Kubernetes Engine (RKE)
Cloud Kubernetes services(e.g. GKE, AKS, EKS)
Import & manage existing Kubernetes clusters

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Empower DevOps Teams
Each team deploys their applications on the public/
private clouds they choose

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Architecture

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Get Started

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Installation
Single Node Install
Install by running a single Docker container
For development and testing environments
High Availability (HA) Install
Install in a Kubernetes cluster
For production environments

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Installation
Single Node Install
Install by running a single Docker container
For development and testing environments
High Availability (HA) Install
Install in a Kubernetes cluster
For production environments

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Create VM on Azure

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Install
ssh to the VM
Install Docker with the following command:
$ curl https://releases.rancher.com/install-docker/18.09.sh | sh
Install Rancher with the following command:
$ sudo docker run -d --restart=unless-stopped -p 80:80
-p 443:443 rancher/rancher:v2.2.2

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Access to VM
https://[IP address of VM]

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Settings
Set a password
Save the URL(default)

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Done :)

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Manage Clusters

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Sample
Add Clusters
Custom
AKS
Deploy WordPress from Catalog

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Create Custom Cluster

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Advance Preparation
Create an another VM for node on Azure
name: rancher-node
image: Ubuntu Server 18.04 LTS
OS-disk-type: Standard SSD
auto-shutdown: off
Add inbound port rules
22, 443

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Select Custom

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Set IPs of VM

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Create a Cluster
Run the copied command on VM
$ sudo docker run -d --privileged --restart=unless-stopped --net=host
-v /etc/kubernetes:/etc/kubernetes -v /var/run:/var/run rancher/rancher-agent:v2.2.2
--server https://xx.xx.xxx.xx --token 666ltr6qntjz2xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
--ca-checksum f707d53266d14e03ff3452896dxxxxxxxxxxxxxxxxxxxxxxxxxxx --address xx.xx.xxx.xx
--internal-address 10.x.x.x --etcd --controlplane --worker

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Provisioning...

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Done :)

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View Resources

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Create AKS Cluster

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Advance Preparation(on Azure)
Create a new resource group for AKS
rancher-aks-sample
Create a service principal
$ az ad sp create-for-rbac --skip-assignment -n sp-aks-sample
appId: 03f94503-xxxx-xxxx-xxxx-xxxxxxxxxxxx
displayName: sp-aks-sample
name: http://sp-aks-sample
password: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
tenant: 2bdec7af-xxxx-xxxx-xxxx-xxxxxxxxxxxx
$ az role assignment create --assignee 03f94503-xxxx-xxxx-xxxx-xxxxxxxxxxxx
--role Contributor --resource-group rancher-aks-sample

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Advance Preparation(on Azure)
Register resource providers
$ az provider register -n Microsoft.OperationalInsights
$ az provider register -n Microsoft.OperationsManagement
https://docs.microsoft.com/en-us/azure/azure-resource-
manager/resource-manager-register-provider-errors

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Select AKS

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Set Credentials
Client ID is appId
Client secret is the password value

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Done :)

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But...

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Unsolved Problem

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Issue
AKS
https://github.com/Azure/AKS/issues/173
Rancher
https://github.com/rancher/rancher/issues/11496

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Deploy WordPress from Catalog

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Deploy on Custom Cluster

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Select WordPress

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Settings
Set Password, and change others if necessary

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Launch
Endpoint is created
http://xip.io-wordpress.wordpress.00.000.000.000.xip.io

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Access to Endpoint

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Deploy on AKS Cluster
Deploy WordPress without L7 Load Balancer

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Because...

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Need to deploy LB on Azure
Deploy nginx-ingress with helm(by default)
Deploy wordpress-ingress.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: wordpress-ingress
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- http:
paths:
- path: /
backend:
serviceName: wordpress-wordpress
servicePort: 80

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Access to Public IP

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What I Felt
Good for cluster management
Can deploy many applications on GUI
Can start monitoring & logging on GUI
Not a few things we have to know
But useful to manage multi-clusters on different
platforms

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Thank you!

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Links
マルチクラウド時代の最強コンビ RancherによるKubernetes
活⽤ガイド
https://thinkit.co.jp/series/8740
Official - Rancher 2.x
https://rancher.com/docs/rancher/v2.x/en/

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Actually, everything is here...
Azure with Rancher !!
https://speakerdeck.com/cyberblack28/azure-with-rancher