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Powerlevel10k

You can find the MAC address for LAN1/eth0 (not the BMC MAC) via the SuperMicro IPMI interface by running the following command:

$ ipmitool -U $IPMI_USER -P $IPMI_PASS -H $IPMI_HOST raw 0x30 0x21 | tail -c 18

The eth0 MAC address will be output in this format:

00 25 90 f0 be ef

cloud-init is absolute cancer. Its code is horrible. It has no documentation at all.

It took me 5 fucking hours to figure out how to properly configure networking on recent cloud-init (Ubuntu 16.04 cloud image) with local datasource.

It's not mentioned anywhere you need to provide dsmode: local. (but only if you need network-config, besides that everything is fine; someone below noted that -m flag does the same thing, good to know) Of course nobody needs documentation for network-config format either. (cloudinit/net/__init__.py is a protip, enjoy the feces dive)

Oh, and by the way - no, it's not possible to provide network-config to uvt-kvm without patching shit.

Replication Notes

Assumption: You have two clusters, access to both, and a pool that exists in both clustsers and you wish to replicate some or all images in that pool to the other cluster.

Mirroring in both directions is required for Cinder to properly implement failover and failback.

Make sure you have the rbd-mirror package installed.

Ceph StaticSites Configuration, with HAProxy & SNI

An instructional document by Robin H Johnson [email protected]. I wrote much of the staticsites functionality of Ceph-RGW, during during late 2015 and early 2016, based on an early prototype by Yehuda Sadeh (yehudasa). It was written for usage at Dreamhost, but developed in the open for community improvement.

It is fully functional as of Jewel v10.2.3 plus PR11280 (ceph/ceph#11280). Prior to that, neither the non-CNAME nor CNAME-to-service modes will function correctly.

These configuration files represent how to quickly set up RGW+HAProxy for staticsite serving. I've tried to make them more readable, without leaving out too many details. You are strongly recommended to run a seperate RGW instance for staticsites, on a DIFFERENT outward-faciing IP than your normal instance (and in fact, certain functionality is not supported without it).

In place of using HAProxy, you could run the second rgw instance on port 80,

	#!/usr/bin/python
	"""
	To use this to mimic the EC2 metadata service entirely, run it like:
	# where 'eth0' is some interface. if i used 'lo:0' i got 5 second or so delays on response.
	sudo ifconfig eth0:0 169.254.169.254 netmask 255.255.255.255

	sudo ./mdserv 169.254.169.254:80
	Then:
	wget -q http://169.254.169.254/latest/meta-data/instance-id -O -; echo
	curl --silent http://169.254.169.254/latest/meta-data/instance-id ; echo

	---
	#
	# Important required settings
	#

	# set haproxy to handle ssl offloading
	haproxy_ssl: true

	# configure the SSL certificates for haproxy
	# these file paths are on the deployment host

	---
	- hosts: all
	gather_facts: no
	vars:
	string: "string"
	list:
	- item1
	- item2
	dict:
	key1: value1

	#!/usr/bin/env bash

	# This is a simple script to do bulk operations on all projects we support
	# Operation:
	# The script clones project config from OpenStack infra then parses the gerrit
	# projects for all of our known projects. Known projects are determined by the
	# name using "openstack/openstack-ansible". Once all projects are discovered a
	# string is built with the "<NAME>\|<URL>" and printed. The script then clones
	# all projects into the workspace and runs the ``bulk_function``. When complete
	# the script commits the changes using the message provided and submits

	#!/bin/bash

	# do this on localhost (deployment host)
	# ensure that there's a local ssh private key
	ssh-keygen -t rsa -N '' -f ~/.ssh/id_rsa

	# now make sure that the public key is in the second host's authorized_keys
	# then do a test ssh connection to make sure it works, and to add the host
	# to known hosts