this post was submitted on 09 Jun 2023
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Can you elaborate on what you mean when you say the fs gets broken? What are the symptoms, what have you tried, and what are any errors or log messages?
Eh, I will have to find my notes on the issue with the pihole, I can see if I can dig them out this weekend and send it to you (I wonder if you can send PM in Lemmy ^^).
To stay on the point of this discussion: just, and I am not joking, this afternoon I got hit by this: https://longhorn.io/kb/troubleshooting-volume-with-multipath/ The pod (in this case wireguard) was crashing because it could not mount the drive and the error was something like "already mounted or mount point busy". I had to dig and dig but I found out the problem was the one above and I fixed it. I will now add that setting in my ansible and configure all three the PIs. However this should not happen for a mature-ish system like longhorn which may cater a userbase which may not know enough to dig into /dev . I think there should be a better way to alert the users for such an issue. Just to be clear, longorn UI and logs were nice and dandy, all good on the western front, but all was broken. Longorn reconciler could have a check that is something should be mounted, and is not, and the error is "already mounted", but is not "already mounted", check for known bugs. However I think the issue is what I said above. It is too fragmented and working with a miriad of other microservices, so longhorn is like "I gave the order, now whatever". I will share what is in my longhorn-system ns, there is no secret in here but I want to give an idea (ps: I do nothing fancy with longhorn at home - obvs some are ds so you see 3 pods because I have 3 nodes):
Dependency on the csi-* ecosystem sort of allows the errors to get lost in translation.
I definitely dont have the expertise or experience digging around device tree, nor the inclination 😅. I’m really not sure what I even want the distributed FS for. I guess I wanted to have redundancy on the pod long term storage, but I have other ways to achieve that. I’ve ran Docker containers in production and in the lab but I’m trying to dip my toes into the k3s waters and see what I can do.
Please do not use my bad experience stop you! Longhorn is a nice tool and as you can read online and in other posts it works very well. I may have unlucky, have a bad configuration or had my PIs under too much pressure. Who knows! My advice is try something new: k3s, longhorn, etc. That is what I use the PIs for. I would not use Longhorn at work :D
I am not using replicas :) I use longhorn for the clean/integrated backup mechanism instead of using something external. Maybe one day when I have the same-ish disk speed on all 3 PIs I will enable replicas but for now I am good like this.
For backups of important stuff maybe use something else or ALSO something else. I was personally thinking to use another backup too for longhorn devices like https://github.com/backube/volsync or velero to have a secondary source in case something happen. Also longhorn is always getting better. This is just out of the press https://github.com/longhorn/longhorn/releases/tag/v1.5.0
My advice? Try it out! If not, it will still be a source of learning and fun (but I am strange, I like to debug stuff).
I’m having enough trouble trying to get k3s running. I keep getting apiserver unavailable, connection refused, etc. kubectl works about 1/10th of the times I call it. I loaded the OS on external HDD to see if that was the problem but no dice.
Sorry to hear. If you had NO connection with kubectl, I would have adviced you to check the ports; but if sometimes it replies and most of the time not, it must be something else. Good luck with the debug and if you have any specific problem you could also try to create a post on any of the self-hosted communities here on lemmy. From my experience people is more friendly and more technical than what we used to have on reddit.
Doing this fixed it
sudo apt install linux-modules-extra-raspi && reboot