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This past month I've been bored and thought I'd play around with repurposing some of my 3 B+ I have. I have been running Pi-Holes on 2, and then had another one that was just sitting around as a little sandbox to play around with. This is a perfectly fine setup, but is incredibly wasteful in terms of resources used on a 3 B+, so I decided I could waste a lot of time and put everything on a kubernetes cluster. At my work, all our services are deployed on kubernetes, so I'm pretty familiar with building all the deployment/service stuff, but not very familiar with setup and actual management of a cluster. So this would be a good learning exercise for me. I started out with a couple goals: get a pi hole onto the cluster, get a plex media server running on it, and get some metrics gathered so I can see all my other devices. When searching around, I found plenty of tutorials on things here and there, many of which ended up only working part of the way requiring a good bit of hacking to get working in the end. I found this a fun little project. I've compiled a lot of links and stuff to get everything put together, and I thought maybe someone else might appreciate them together, or even just to get some inspiration.

First up, the hardware. I had 3 3B+, and I wanted a 1 master + 4 worker node cluster. Looking around I found a very nice setup which suited my needs and looked decent. If you are interested in the original inspiration (and some list of parts) here is what I based mine on. I did change a few things:

1. I used this 6-port usb charger. I tried the one listed and it did not provide enough power to all the ports. Maybe just a bad one, but I already had another one and it worked fine.
   
2. Instead of the mSATA expansion board, I ended up using a mSATA enclosure. I tried the expansion board and it gave me nothing but problems. Constantly dropped mounts and general instability. Took me at least a week to really narrow it down to the board.
   
   Cluster setup:
   For the kubernetes setup I followed this guide. Probably one of the more straight forward parts of this entire build.
   
   Exposing a service:
   I wanted to be able to expose services via their own IP address, so I went with a load balancer instead of an ingress. Metallb was straight forward to install, and gave me everything I wanted. I shrunk the subnet my DHCP would hand out, and gave a set of 10 IPs for it to use. The one catch I've noticed is when redeploying some services the IP can get stuck routing to a recycled pod. Effectively black holing the IP. At first I would just pick a different IP for that specific service, but that is not fun when you need to update references everywhere. I eventually found that recycling the metallb pod would get everything straightened out. I made this small script to run anytime I found a dead IP after a redeploy:
   
   kubectl get pods --no-headers -o custom-columns=:metadata.name -n metallb-system | while read pod; do
   kubectl delete pod "$pod" -n metallb-system
   done
   
   Metrics and Monitoring:
   I first wanted to get the kubernetes dashboard working. It seemed simple enough, just installing https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta1/aio/deploy/recommended.yaml, but found that some of the images were not arm compatible. The main issue was https://github.com/kubernetes/dashboard/issues/4029 which eventually got fixed. I am not sure if any new images were pushed to docker.io. I ended up setting up a local docker repo, building the fixed image locally, and then using the verson on my local docker.
   
   I also found some nice use cases for using telegraf+influxdb+grafana. I could use this to aggregate node data, but also some services. The original monitoring sets that I followed is found here, while the steps to setup a influxdb+grafana I took from here.
   
   Storage:
   Persistant storage would be needed for just about everything. I started with Heketi and glusterfs, but just couldn't get it to work. I ended up just setting up a NFS provisioner. To prepare the drive I followed this and then followed the storage section of this guide.
   
   Pi Hole:
   I used this nice guide to getting started. It basically worked out of the box. The main caveats were changing the PV to use my NFS shares, use a load balancer instead of ingress, and pass in a password so it wouldn't auto generate each time the pod was recreated.
   
   Plex:
   I found a decent starting point using this guide. That project does a little more than I wanted as well, so I specifically turned off the kubePlex option to farm off transcoding jobs onto the cluster. Then I had to switch the plex image to jaymoulin/plex and set node selectors to arm. To keep the configuration set after restarts I also had to add a volume mount to /root/Library.
   
   The end result is I have a secondary pi hole, plex server, and monitoring stack running across 4 worker nodes. Still plenty of room for other things, I just haven't decided yet what else to add.

Anker power supply - not a USB hub, but a six port USB power supply. If you would rather use a USB hub, I.e. Use the hub to both power some RPis and serve as a USB hub use this.

Looks shady, also:

> Additional Notes: HUB can't be used as a Charger.

It's unlikely you'd be able to run enough current through that thing to run a keyboard, mouse, and 14 flash drives; There's no way you can charge 10 GoPros and 6 phones without frying it.

6 device charging stations exist, but they're designed to be connected to mains, not 12v vehicle electrical systems - see, e.g. this one from Anker, or this one from RAVPower.

The only way you'll be able to set something like this up without an inverter is if you design and build your own, with a heavy-duty buck converter or a bank of smaller buck converters wired to the battery, with their outputs wired to USB ports. It's not a terribly expensive proposition, as the components themselves are cheap, but you're going to need to be handy with a soldering iron, and it's going to be time consuming.

Do-hickey

Your Nokia supports QC 3.0 but others don't. Better to stick with the adaptor that comes in the box.

This one is costly but doesn't come with quick charge. Normal fast charging is available though at 2.4amps/port. https://www.amazon.in/dp/B00P933OJC/

I have that same grip. I’ve charged it using the cables that came with to pro controller as well as these for cables. In terms of things I’ve plugged the cables into: the dock, and this Anker charger as well as the 10 port version (I have both).