Reinstall already installed k0s to reconfigure installFlags

[kke]

Fixes #302

If k0s is already installed, use k0s install --force to reinstall it if installFlags have changed.

Also, reinstall will now be performed during upgrades.

Note that changing the flags on an existing cluster may cause problems.

[kke]

Not yet completely convinced the re-install blindly strategy is a winner. Maybe comparing the flags in ExecStart (or openrc -equivalent) would be better.

[kke]

k0s status has Args:.. 🤔

// k0s status -o json
{
   "Version": "v1.30.4+k0s.0",
   "Pid": 192,
   "PPid": 0,
   "Role": "controller",
   "SysInit": "",
   "StubFile": "",
   "Output": "",
   "Workloads": false,
   "SingleNode": false,
   "Args": [
      "/root/k0s-v1.30.4+k0s.0-amd64",
      "controller",
      "--enable-dynamic-config=true"
   ],

[kke]

New approach: check for changes in installFlags vs status.Args reported by k0s status.

[ry4nz]

@kke Do you known what's the timeline for this to be merged and released?

[kke]

@kke Do you known what's the timeline for this to be merged and released?

Would be great if someone tried it out. I can of course put it in a beta if that makes it easier.

[kke]

Now available in https://github.com/k0sproject/k0sctl/releases/tag/v0.19.0-beta.1

[tppolkow]

I've verified via v0.19.0-beta.1 I am able to update install flags with a second k0sctl apply and it works as expected. Thanks for the fix @kke !