yorickdowne

Overview

Ubuntu Desktop 20.04 supports a single ZFS boot drive out of the box. I wanted a ZFS mirror, without going through an entirely manual setup of Ubuntu as described by OpenZFS in their instructions for Ubuntu 20.04 and instructions for Ubuntu 22.04

This adds a mirror to an existing Ubuntu ZFS boot drive after the fact. It's been tested on Ubuntu 20.04 by me and all the way up to Ubuntu 22.10 by users in comments.

ZFS requires native encryption to be added at pool / dataset creation. Ubuntu 22.04 supports this during installation. Whether these instructions are suitable for mirroring such a setup has not been tested. For Ubuntu 20.04, these instructions are not suitable for creating an encrypted ZFS boot disk, please use the full instructions linked above for that. You can, however, add an en

yorickdowne

Use ufw for some, but not all, Docker traffic

This is a slight tweak to https://github.com/chaifeng/ufw-docker by way of https://p1ngouin.com/posts/how-to-manage-iptables-rules-with-ufw-and-docker

For an automated way of handling ufw rules via docker-compose, see https://github.com/shinebayar-g/ufw-docker-automated

Use case

I wanted Docker to keep managing its own iptables rules, including automatically opening port forwards, with the option of stepping in and restricting a port that I did not want open to "world". Container-to-container traffic should flow unimpeded,

yorickdowne

Medalla non-finality mid October

What is happening with the Medalla eth2 testnet currently, Oct 17th 2020? Here's an ELI5. (Not exactly 5. Maybe 10. You get the idea.)

1. A bunch of validators turned off (maybe zinken, maybe bored, who knows)
2. We entered non-finality. This means we don't have enough validators online to agree to what the state of the network is. We need 2/3rds.
3. Some sync bugs reared their heads, in Prysm and Nimbus. We lost more validators to the bugs, not everyone has updated since
4. Non-finality increases memory and CPU requirements, we likely lost more validators because their nodes couldn't handle it
5. Either people come back in and we regain finality or
6. They don't and offline validators lose eth faster and faster, until we regain finality. Some may be ejected if their balance falls too low.

yorickdowne

Emergency procedure

Only do this in emergencies, such as when eth2 is not syncing or RAM/CPU use is spiking. This procedure can be used for Prysm or Lighthouse.

The specific client versions mentioned here are for RocketPool 0.0.8. They will not work in prior versions of RP.

Edit config.yml:

cd ~/.rocketpool