Settign up Ceph on Cloudnium

Here's a step-by-step guide to setting up a Ceph cluster on Cloudnium:

Prerequisites:

You have an account on Cloudnium and have created a new instance.
Your instance is running Ubuntu 16.04 (or later) with at least 4 CPU cores, 8 GB RAM, and 30 GB of disk space.
You have the necessary credentials to access your instance via SSH.

Step 1: Prepare the instances

Log in to your Cloudnium instance using SSH.
Create three new instances with the same configuration as your original instance. You can use the "Create Instance" button on the Cloudnium dashboard or run the command cloudnium create --name --size --image ubuntu (replace and with your desired values).
Wait for all instances to be created and available.

Step 2: Configure the first node

Connect to the first instance using SSH.
Install Ceph on the first node by running the command sudo apt-get update && sudo apt-get install -y ceph
Configure the first node as a Ceph mon (monitor) by running the command sudo ceph-mon --mkfs
Create a Ceph configuration file (ceph.conf) on the first node by running the command sudo tee /etc/ceph/ceph.conf <


Start the Ceph monitor service on the first node by running the command sudo systemctl start ceph-mon


Step 3: Configure the remaining nodes

Connect to each of the remaining two instances using SSH.
Install Ceph on each node by running the command sudo apt-get update && sudo apt-get install -y ceph
Configure each node as a Ceph osd (object storage device) by running the command sudo ceph-osd --mkfs
On each node, create a Ceph configuration file (ceph.conf) similar to the one created on the first node.
Start the Ceph OSD service on each node by running the command sudo systemctl start ceph-osd

Step 4: Form the Ceph cluster

On the first node (the mon), run the command sudo ceph-mon --join , replacing  with the IP address of the first node.
On each of the remaining two nodes, run the command sudo ceph-osd --mkfs --mon-host=, replacing  with the IP address of the first node.

Step 5: Verify the Ceph cluster

Run the command ceph -s on any node in the cluster to verify that it's up and running.
You can also run the command ceph -w to check the health of the cluster.

That's it! You now have a basic Ceph cluster set up on Cloudnium. You can use this as a foundation for building more complex storage solutions or experimenting with different Ceph configurations.
Note: This is just a basic guide and you may need to perform additional steps or configure your Ceph cluster further depending on your specific requirements.