Explicitly state the systemd requirement for the remote Linux host

[mark-benge]

Why do you need this?

At the end of this paragraph
This tool uses ssh to install k3s to a remote Linux host. A requirement is that systemd must be running on the remote Linux host or the install will fail. You can also use it to join existing Linux hosts into a k3s cluster as agents. First, k3s is installed using the utility script from Rancher, along with a flag for your host's public IP so that TLS works properly. The kubeconfig file on the server is then fetched and updated so that you can connect from your laptop using kubectl.
Add the following Note:
Note: A requirement is that systemd must be running on the remote Linux host or the install will fail.

Avoid unnecessary dev installs unless the environment is up-to-par, Ubuntu on Windows as an example.

Readme clarification

Expected Behaviour

Notify developers of the systemd requirement for the Linux remote host

Current Behaviour

k3s Installs will fail if the remote Linux host is not running systemd.

Possible Solution

Add the Note as suggested above.

Steps to Reproduce

1. Not and issue with k3sup ... Readme update request

Your Environment

• k3sup version: Latest

k3sup version

• What Kubernetes distribution, client and server version are you using?

kubectl version

• What OS or type or VM are you using for your cluster? Where is it hosted? (for k3sup install/join):

• Operating System and version (e.g. Linux, Windows, MacOS):

uname -a

cat /etc/os-release

Do you want to work on this?

Subject to design approval, are you willing to work on a Pull Request for this issue or feature request?

• Yes
• No

[alexellis]

Hi,

Perhaps what we will do instead is link to K3s, if we haven't already. K3sup doesn't require systemd. Kubernetes does and that's a k3s requirement.

Thanks for your interest

Alex