Tectonic Configuration

Here is a running guide on how to implement Rook on Tectonic. A complete guide on how to install Tectonic is out of the scope of the Rook project. More info can be found on the Tectonic website

Prerequisites

• An installed tectonic-installer. These steps are described on the Tectonic website
• A running matchbox node which will do the provisioning (Matchbox is only required if you are running Tectonic on Bare metal)
• You can run through all steps of the GUI installer, but in the last step, choose Boot manually. This way we can make the necessary changes first.

Edit the kubelet.service file

We need to make a few adaptions to the Kubelet systemd service file generated by the Tectonic-installer.

First change to the directory in which you untarred the tectonic installer and find your newly generated cluster configuration files.

cd ~/tectonic/tectonic-installer/LINUX-OR-DARWIN/clusters

Open the file modules/ignition/resources/services/kubelet.service in your favorite editor and after the last line containing ExecStartPre=..., paste the following extra lines:

ExecStartPre=/bin/mkdir -p /var/lib/kubelet/volumeplugins
ExecStartPre=/bin/mkdir -p /var/lib/rook

And after the ExecStart=/usr/lib/coreos/kubelet-wrapper \ line, insert the following flag for the kubelet-wrapper to point to a path reachable outside of the Kubelet rkt container:

--volume-plugin-dir=/var/lib/kubelet/volumeplugins \

Save and close the file.

Boot your Tectonic cluster

All the preparations are ready for Tectonic to boot now. We will use terraform to start the cluster. Visit the official Tectonic manual boot page for the commands to use.

Remark: The Tectonic installer contains the correct terraform binary out of the box. This terraform binary can be found in following directory ~/tectonic/tectonic-installer/linux.

Start Rook

After the Tectonic Installer ran and the Kubernetes cluster is started and ready, you can follow the Rook installation guide. If you want to specify which disks Rook uses, follow the instructions in creating Rook clusters