Docker: Error response from daemon: path / is mounted on / but it is not a shared or slave mount

Hi everyone,I’m fairly new to Docker & Linux, despite being in I.T for over a decade.

I am trying to setup Grafana + Prometheus + Prometheus node exported using this script -

Grafana Prometheus Install · GitHub .

After running the 2nd line ““docker run -d --net=“host” --pid=“host” -v “/:/host:ro,rslave” Quay --path.rootfs=/host”” , I get the following error:

“docker: Error response from daemon: path / is mounted on / but it is not a shared or slave mount.”

I found a Kube page about fixing the issue, but it doesn’t make sense to me, and looks to be Kube specific.

Over SSH I’ve run the following to rule out any simple issues.
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apt-get update && apt-get upgrade -y && sudo apt full-upgrade -y
apt-get update && apt-get dist-upgrade
reboot
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Any help would be greatly appreciated!
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Setup:
Proxmox v7.2.4

Container - Ubuntu LTS 22.04

Docker Compose v2.6.0

Docker:
Client: Docker Engine - Community
Version: 20.10.17
API version: 1.41
Go version: go1.17.11
Git commit: 100c701
Built: Mon Jun 6 23:02:46 2022
OS/Arch: linux/amd64
Context: default
Experimental: trueServer: Docker Engine - Community
Engine:
Version: 20.10.17
API version: 1.41 (minimum version 1.12)
Go version: go1.17.11
Git commit: a89b842
Built: Mon Jun 6 23:00:51 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.6