This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.
Step 1 - Enable NBD on the Host
modprobe nbd max_part=8
# LICENSE: public domain | |
def calculate_initial_compass_bearing(pointA, pointB): | |
""" | |
Calculates the bearing between two points. | |
The formulae used is the following: | |
θ = atan2(sin(Δlong).cos(lat2), | |
cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong)) |
/* | |
d8888 .d8888b. 888b 888 | |
d88888 d88P Y88b 8888b 888 | |
d88P888 888 888 88888b 888 | |
.d8888b d88P 888 888 888Y88b 888 | |
88K d88P 888 888 888 Y88b888 | |
"Y8888b. d88P 888 888 888 888 Y88888 | |
X88 d8888888888 Y88b d88P 888 Y8888 | |
88888P' d88P 888 "Y8888P" 888 Y888 | |
#!/usr/bin/env bash | |
# Installs/Configures: | |
# - Docker | |
# - Docker Registy Container with self-signed cert | |
# | |
# Tested on Ubuntu 14.04.1 | |
# Must be executed with elevated privilages | |
if [ "$(id -u)" != "0" ]; then |
#!/bin/bash | |
################################################################################## | |
# Author: Gagandeep Arora | |
# Date: 01-Oct-2014 | |
# Purpose: To sync the rbds using incremenatl snapshots from production ceph cluster | |
# to backup ceph cluster | |
################################################################################## | |
mirrorPool() { | |
#list all images in the pool | |
IMAGES=`$SOURCERBDCMD ls $SOURCEPOOL` |
Server 2 sockets,6 cores each, 2.4ghz | |
# Set ixgbe options | |
# Limit RSS queues to the number of physical cores per cpu | |
# Disable offload | |
# When you change this, you need to run the command and reboot for it to take. | |
echo "options ixgbe LRO=0,0 MQ=1,1 RSS=6,6 VMDQ=0,0 vxlan_rx=0,0" > /etc/modprobe.d/ixgbe.conf | |
# Shut down HT cores | |
for i in $(seq 1 2 23); do |
#!/usr/bin/python | |
import os | |
import sys | |
import time | |
from pprint import pprint | |
from concurrent import futures | |
from keystoneclient.v2_0 import client as ks_client | |
from novaclient import client as nova_client | |
from neutronclient.neutron import client as neutron_client |
This assumes you have GTX980 cards in your system (PCI id 10de:13c0
& 10de:0fbb
per card). Just add more IDs for other cards in order to make this more generic. This also assumes nova uses qemu-kvm
as the virtualization hypervisor (qemu-system-x86_64
). This seems to be the default on OpenStack Newton when installed using openstack-ansible
.
We assume OpenStack Newton is pre-installed and that we are working on a Nova compute node. This has been tested on an Ubuntu 16.04 system where I installed OpenStack AIO version 14.0.0 (different from the git tag used in the instructions!): http://docs.openstack.org/developer/openstack-ansible/developer-docs/quickstart-aio.html
Note: This is heavily based on information from https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#Enabling_IOMMU adapted for Ubuntu 16.04
#!/usr/bin/env python3 | |
""" | |
License: MIT License | |
Copyright (c) 2023 Miel Donkers | |
Very simple HTTP server in python for logging requests | |
Usage:: | |
./server.py [<port>] | |
""" | |
from http.server import BaseHTTPRequestHandler, HTTPServer |