Multipass-SSH-Configuration.md

LAB: Multipass-SSH-Configuration (Create Ansible Test Environment)

This scenario shows:

• how to install multipass
• how to create control node, managed nodes
• how to configure ssh between control node and managed nodes

Steps

• "Multipass is a mini-cloud on your workstation using native hypervisors of all the supported plaforms (Windows, macOS and Linux)"
• Fast to install and to use.
• Link: https://multipass.run/
• Install on Linux, Windows and MacOs: https://multipass.run/install
• After installing, we can create VMs on our local machine.

# creating controlnode, managed nodes (node1, node2, etc.)
# -c => cpu, -m => memory, -d => disk space
multipass launch --name controlnode -c 2 -m 2G -d 10G   
multipass launch --name node1 -c 2 -m 2G -d 10G
multipass launch --name node2 -c 2 -m 2G -d 10G
multipass list

• Connect VMs by opening shells

# get shell on controlnode
multipass shell controlnode
# get shell on node1, on different terminal
multipass shell node1
# get shell on node2, on different terminal
multipass shell node2

sudo apt update
sudo apt install net-tools
# to see IPs
ifconfig

• Create ssh public key on control plane
• Copy the public key from control plane

> on controlnode
ssh-keygen (no password, enter 3 times)
cat ~/.ssh/id_rsa.pub (copy the value)

• Paste copied public key (control plane) into the authorized_keys in each managed nodes.

cd .ssh (on each workers)
nano authorized_keys 
> Paste keys from controlnode (hence managed nodes know the controlnode IP and public key, controlnode can connect it)

• List all VMs to get IPs

multipass list

• SSH from controlplane to node1

ssh <IP>
or 
ssh <username>@<IP>

References

• https://techsparx.com/linux/multipass/enable-ssh.html