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Multi-master HA Kubernetes using K3Sup on Windows10/Server 2019 (video tutorial in the works)

Software used:

1. Install K3Sup.exe

In this tutorial I created a folder K3sup @ C:\Users\username\k3sup\

With Powershell (change username to you & take notice of version of k3sup 0.9.2)

Invoke-WebRequest -OutFile C:\Users\username\k3sup\K3sup.exe
Open the Search, type in “env”, Click on "Edit Enviroment Variables for **Your Account**"

At Top in "User Varibles" Click on the "Path" Variable line and select Edit.

On right Select "Browse" and select the folder we created that you added K3Sup.exe too.
PS C:\Users\username> k3sup
 _    _____
| | _|___ / ___ _   _ _ __  
| |/ / |_ \/ __| | | | '_ \ 
|   < ___) \__ \ |_| | |_) |
|_|\_\____/|___/\__,_| .__/ 
  k3sup [flags]
  k3sup [command]

Available Commands:
  app         Install Kubernetes apps from helm charts or YAML files
  help        Help about any command
  install     Install k3s on a server via SSH
  join        Install the k3s agent on a remote host and join it to an existing server
  update      Print update instructions
  version     Print the version

  -h, --help   help for k3sup

2. Install/Configure 3 VM's (I have created 3 Ubuntu 18.04 Machines)

  • Configure hosts

nano /etc/hosts

Sample       localhost  master

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes ff02::2 ip6-allrouters - node01 - node02
  • Enable Passwordless Sudo

sudo nano /etc/sudoers
Find the line which contains #includedir /etc/sudoers.d
Below that line add: username ALL=(ALL) NOPASSWD: ALL
  • Disable Swap

swapoff -a
nano /etc/fstab
Comment out line "#/dev/mapper/master--vg-swap_1 none            swap    sw              0       0"
reboot and make sure it's off.
do "free -h" and make sure swap says "0"

3. Install/Configure OpenSSH on Windows Server 2019/Windows 10 1809

A. Install OpenSSH

  • Via Windows GUI

  • Via Powershell

B. Install Git, vscode & Kubectl - (install choco here -

Make sure to run powershell as administrator

choco install git -y
choco install kubernetes-cli -y
choco install vscode -y

Might need to reboot after all that.

C. Generate SSH Key

  • Open Visual Studio Code/Set default shell GitBash

username@Shed-Lappy MINGW64 ~
$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/username/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /c/Users/username/.ssh/id_rsa
Your public key has been saved in /c/Users/username/.ssh/
The key fingerprint is:
SHA256:J3cCEe+05wZ5c0LF+BWCZ2NSnV7NI+2dMNvyzH9q4EY username@Shed-Lappy
The key's randomart image is:
+---[RSA 3072]----+
|        o.  o=+o+|
|         o o.Xo==|
|        . o *.X.=|
|         + + o.=.|
|        S O * *  |
|         + BE+ + |
|           oo.  .|
|           .o . o|
|           . ....|

C. Copy key to all 3 Machines/Also in GitBash

ssh-copy-id username@

Example Output

username@Shed-Lappy MINGW64 ~
$ ssh-copy-id username@
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/c/Users/username/.ssh/"
The authenticity of host ' (' can't be established.
ECDSA key fingerprint is SHA256:GE2bt679dcjb0X+Qo0Z33I54QDE8BVf8crSkhefcRTQ.
Are you sure you want to continue connecting (yes/no/[fingerprint])? Yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
username@'s password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'username@'"
and check to make sure that only the key(s) you wanted were added.

D. Disable Password Authentication on your Server (Optional)

sudo nano /etc/ssh/sshd_config

Change line #PasswordAuthentication Yes to

PasswordAuthentication no

sudo service ssh restart

4. Now all the fun we worked so hard for.

  • Create

Again I created a folder for k3sup for simplicity

username@Shed-Lappy MINGW64 ~
$ cd k3sup

username@Shed-Lappy MINGW64 ~/k3sup
$ touch

Paste into (make sure to change ip's)

set -e

export NODE_1=""
export NODE_2=""
export NODE_3=""
export USER=root

# The first server starts the cluster
k3sup install \
  --cluster \
  --user $USER \
  --ip $NODE_1

# The second node joins
k3sup join \
  --server \
  --ip $NODE_2 \
  --user $USER \
  --server-user $USER \
  --server-ip $NODE_1

# The third node joins
k3sup join \
  --server \
  --ip $NODE_3 \
  --user $USER \
  --server-user $USER \
  --server-ip $NODE_1

Make sure we are remaining in gitbash

username@Shed-Lappy MINGW64 ~/k3sup
$ ./

Once that is complete.

username@Shed-Lappy MINGW64 ~/k3sup
$ export KUBECONFIG=`pwd`/kubeconfig

username@Shed-Lappy MINGW64 ~/k3sup
$ kubectl get node
node01   Ready    master   54s   v1.17.2+k3s1
master   Ready    master   81s   v1.17.2+k3s1
node02   Ready    master   35s   v1.17.2+k3s1

Have Fun :)