Comment on Questions regarind k8s ingress
Hercules@lemmy.world 2 weeks agoCeph is really cool, i also wanna use it in the future but i need way more disks for that :). Are those 25 worker nodes virtual machines? How did you attatch the disks to the ceph nodes?
one_knight_scripting@lemmy.world 2 weeks ago
Heads up, this is going to be an incredibly detailed comment, sorry. So, at the time I stood up that cluster, it was not in Ceph. I had setup the host to run Ubuntu 24.04 with Root on ZFS and the host was simply connected to itself via NFS.
Here is the Github I created for the Root on ZFS installation, I’m not sure if you are familiar with ZFS but it is an incredibly feature rich filesystem. Similar to BTRFS, you can take snapshots of the server so basically if your host goes down you have a backup at least. On top of that, you get L2ARC caching. Basically, any time it reads or writes to my zpool, that is handled in the background by my NVMe SSD. It also caches the most frequently used files so that it doesn’t have to read from a HDD everytime. I will admit that ZFS does use a lot of memory, but the L2ARC kinda saved me from that on this server.
Ultimately that cluster was not connected to CEPH, but simply NFS. Still, I created a Github repository which is basically just one command to get Ubuntu 24.04 installed with Root on ZFS. Its not prefect, if it seems like it is frozen, just hit enter a couple times, I don’t know where it is getting hung up and I’m too lazy to figure it out. After that, I followed this guide for turning it into a Cloudstack Host: rohityadav.cloud/blog/cloudstack-kvm/.
That was my initial setup. But now I have it setup significantly differently. I rebuilt my host, installed Ubuntu 24.04 to my NVMe drive this time. Did some fairly basic setup with Cephadm to deploy the osds. After the OSD’s were deployed, I followed this guide for getting it setup with cloudstack: www.shapeblue.com/ceph-and-cloudstack-part-1/. The only other issue is that you do need a secondary storage server as well. I’ve personally decided to use NFS for that similar to my original setup. Now Ceph does use a LOT of memory. It is currently the only thing running on my host and I’ve attached a screenshot. Image 77GB!!! OoooWeee… A bit high. Admittedly, this is likely because I am not running just the Rados image store, but also an *arr stack in cephfs on it.
I do potentially see some issues, with ceph, the data is supposed to be redundant, but I’ve only provided one ip for it for the moment until I figure out the issues I’m having with my other server. That is some exploration that I’ve not done yet.
Finally takes a breath Anyways, the reason I choose Cloudstack was to delve into the DevOps space a little bit except home built and self-hosted. It is meant to be quite large, and be used by actual cloud providers. Not only can you set up linux servers with cloud-init user data, but Terraform works by default.
The thing that is interesting about K8S deployments is that it is just the click of a single button. Sure, first you have to download the iso, or build your own with the built-in script, but Cloudstack manipulates the cloud-init user data of each node in the cluster to set it up automatically whether it is a control node, or a worker node.