wip

.gitignore

@@ -11,3 +11,4 @@ __pycache__/
 security/letsencrypt/introduction/certs/**
 kubernetes/shipa/installs/shipa-helm-chart-1.1.1/
 messaging/kafka/data/*
+kubernetes/rancher/volume/*

kubernetes/rancher/README.md

@@ -0,0 +1,230 @@
+# Introduction to Rancher: On-prem Kubernetes
+
+This guide follows the general instructions of running a [manual rancher install](https://rancher.com/docs/rancher/v2.5/en/quick-start-guide/deployment/quickstart-manual-setup/) and running our own infrastructure on Hyper-v
+
+# Hyper-V : Prepare our infrastructure
+
+In this demo, we will use Hyper-V to create our infrastructure.  </br>
+For on-premise, many companies use either Hyper-V, VMWare Vsphere and other technologies to create virtual infrastructure on bare metal. </br>
+
+Few points to note here:
+
+* Benefit of Virtual infrastructure is that it's immutable
+  a) We can add and throw away virtual machines at will.
+  b) This makes maintenance easier as we can roll updated virtual machines instead of 
+     patching existing machines and turning them to long-living snowflakes.
+  c) Reduce lifespan of machines
+
+* Bare Metal provides the compute. 
+  a) We don't want Kubernetes directly on bare metal as we want machines to be immutable.
+  b) This goes back to the previous point on immutability.
+
+* Every virtual machine needs to be able to reach each other on the network
+  a) This is a kubernetes networking requirements that all nodes can communicate with one another
+
+# Hyper-V : Create our network
+
+In order for us to create virtual machines all on the same network, I am going to create a virtual switch in Hyper-v </br>
+Open Powershell in administrator
+
+```
+# get our network adapter where all virtual machines will run on
+# grab the name we want to use
+Get-NetAdapter
+
+Import-Module Hyper-V
+$ethernet = Get-NetAdapter -Name "Ethernet 2"
+New-VMSwitch -Name "virtual-network" -NetAdapterName $ethernet.Name -AllowManagementOS $true -Notes "shared virtual network interface"
+```
+
+# Hyper-V : Create our machines
+
+We firstly need harddrives for every VM. </br>
+Let's create three:
+
+```
+mkdir c:\temp\vms\linux-0\
+mkdir c:\temp\vms\linux-1\
+mkdir c:\temp\vms\linux-2\
+
+New-VHD -Path c:\temp\vms\linux-0\linux-0.vhdx -SizeBytes 20GB
+New-VHD -Path c:\temp\vms\linux-1\linux-1.vhdx -SizeBytes 20GB
+New-VHD -Path c:\temp\vms\linux-2\linux-2.vhdx -SizeBytes 20GB
+```
+
+```
+New-VM `
+-Name "linux-0" `
+-Generation 1 `
+-MemoryStartupBytes 2048MB `
+-SwitchName "virtual-network" `
+-VHDPath "c:\temp\vms\linux-0\linux-0.vhdx" `
+-Path "c:\temp\vms\linux-0\"
+
+New-VM `
+-Name "linux-1" `
+-Generation 1 `
+-MemoryStartupBytes 2048MB `
+-SwitchName "virtual-network" `
+-VHDPath "c:\temp\vms\linux-1\linux-1.vhdx" `
+-Path "c:\temp\vms\linux-1\"
+
+New-VM `
+-Name "linux-2" `
+-Generation 1 `
+-MemoryStartupBytes 2048MB `
+-SwitchName "virtual-network" `
+-VHDPath "c:\temp\vms\linux-2\linux-2.vhdx" `
+-Path "c:\temp\vms\linux-2\"
+
+```
+
+Setup a DVD drive that holds the `iso` file for Ubuntu Server
+
+```
+Set-VMDvdDrive -VMName "linux-0" -ControllerNumber 1 -Path "C:\temp\ubuntu-20.04.3-live-server-amd64.iso"
+Set-VMDvdDrive -VMName "linux-1" -ControllerNumber 1 -Path "C:\temp\ubuntu-20.04.3-live-server-amd64.iso"
+Set-VMDvdDrive -VMName "linux-2" -ControllerNumber 1 -Path "C:\temp\ubuntu-20.04.3-live-server-amd64.iso"
+```
+
+Start our VM's
+
+```
+Start-VM -Name "linux-0"
+Start-VM -Name "linux-1"
+Start-VM -Name "linux-2"
+```
+
+Now we can open up Hyper-v Manager and see our infrastructure. </br>
+In this video we'll connect to each server, and run through the initial ubuntu setup. </br>
+Once finished, select the option to reboot and once it starts, you will notice an `unmount` error on CD-Rom </br>
+This is ok, just shut down the server and start it up again.
+
+# Hyper-V : Setup SSH for our machines
+
+Now in this demo, because I need to copy rancher bootstrap commands to each VM, it would be easier to do so
+using SSH. So let's connect to each VM in Hyper-V and setup SSH. </br>
+This is because `copy+paste` does not work without `Enhanced Session` mode in Ubuntu Server. </br>
+
+Let's temporarily turn on SSH on each server:
+
+```
+sudo apt update
+sudo apt install -y nano net-tools openssh-server
+sudo systemctl enable ssh
+sudo ufw allow ssh
+sudo systemctl start ssh
+```
+
+Record the IP address of each VM so we can SSH to it:
+
+```
+sudo ifconfig
+# record eth0
+linux-0 IP=192.168.0.22
+linux-1 IP=192.168.0.23
+linux-2 IP=192.168.0.24
+```
+
+In new Powershell windows, let's SSH to our VMs
+
+```
+ssh linux-0@192.168.0.22
+ssh linux-1@192.168.0.23
+ssh linux-2@192.168.0.24
+```
+
+# Setup Docker
+
+It is required that every machine that needs to join our cluster, has docker running on it. </br>
+Firstly, rancher will use docker to run it's agent as well as bootstrap the cluster.</br>
+
+Install docker on each VM:
+```
+curl -sSL https://get.docker.com/ | sh
+sudo usermod -aG docker $(whoami)
+sudo service docker start
+```
+
+# Running Rancher in Docker
+
+So Rancher can be [deployed](https://rancher.com/docs/rancher/v2.5/en/quick-start-guide/deployment/) almost anywhere. </br>
+We can run it in Kubernetes on-prem or the cloud.  </br>
+
+Now because we want Rancher to manage kubernetes clusters, we dont want it running in the clusters we are managing. </br>
+So I would like to keep my Rancher server outside and separate from my Kubernetes clusters.</br>
+
+So let's setup a single server with [docker](https://rancher.com/docs/rancher/v2.5/en/quick-start-guide/deployment/quickstart-manual-setup/)
+
+## Persist data
+
+We will want to persist ranchers data across reboots. </br>
+Rancher stores its data under `/var/lib/rancher` 
+
+Let's create some space to save data:
+
+```
+cd kubernetes/rancher
+mkdir volume
+
+```
+
+## Run Rancher
+
+```
+docker run -d --name rancher-server  -v ${PWD}/volume:/var/lib/rancher --restart=unless-stopped -p 80:80 -p 443:443 --privileged rancher/rancher
+```
+
+## Unlock Rancher
+
+Once its up and running we can extract the Rancher initial boostrap password from the logs 
+
+```
+docker logs rancher-server > rancher.log
+```
+
+## Get Rancher IP
+
+It's important that our servers can reach the Rancher server. </br>
+As all the VMs and my machine are on the same network, we can use my machine IP as the server IP so the VM's can reach it. </br>
+let's grab the IP:
+
+```
+ipconfig
+```
+
+We can now access Rancher on [localhost](https://localhost)
+
+## Deploy Sample Workloads
+
+To deploy some sample basic workloads, let's get the `kubeconfig` for our cluster </br>
+
+Set kubeconfig:
+
+```
+$ENV:KUBECONFIG="<path-to-kubeconfig>"
+```
+
+Deploy 2 pods, and a service:
+
+```
+kubectl create ns marcel
+kubectl -n marcel apply -f .\kubernetes\configmaps\configmap.yaml
+kubectl -n marcel apply -f .\kubernetes\secrets\secret.yaml
+kubectl -n marcel apply -f .\kubernetes\deployments\deployment.yaml
+kubectl -n marcel apply -f .\kubernetes\services\service.yaml
+```
+
+One caveat is because we are not a cloud provider, Kubernetes does not support our service `type=LoadBalancer`. </br>
+For that, we need something like `metallb`. </br>
+However - we can `port-forward`
+
+```
+kubectl -n marcel get svc 
+NAME              TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
+example-service   LoadBalancer   10.43.235.240   <pending>     80:31310/TCP   13s
+
+kubectl -n marcel port-forward svc/example-service 81:80
+```
+
+We can access our example-app on port 81