bitsandbooks

Ubuntu 20.04 + Autoinstall + VirtualBox

Intro

This guide will explain how to set up a [VirtualBox][] VM running [Ubuntu 20.04][] and, using the new [autoinstall][] tool and cloud-init, install OpenSSH server, add a group and a user, who can then connect to the machine via SSH. This was done on a 2016 MacBook Pro running macOS 10.15 "Catalina" and VirtualBox 6.1.6 (with the VirtualBox Guest Additions installed).

You will also need a group name, a username, a password hash and an SSH key pair.

How Autoinstall Works

koshatul

gpg-agent setup

Need to setup gpg-agent first, on OSX I use keychain (it also does ssh-agent)

$ brew info keychain
keychain: stable 2.8.5
User-friendly front-end to ssh-agent(1)
https://www.funtoo.org/Keychain
/usr/local/Cellar/keychain/2.8.5 (7 files, 108.5KB) *

benbonnet

# Source : https://mherman.org/blog/setting-up-a-kubernetes-cluster-on-ubuntu/

# on all nodes
sudo apt-get update && sudo apt-get install -y apt-transport-https
curl -s https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
sudo apt update && sudo apt install -qy docker-ce
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update && sudo apt-get install -y kubeadm kubelet kubectl

levidyrek

"""
Django ORM Optimization Tips

Caveats:
* Only use optimizations that obfuscate the code if you need to.
* Not all of these tips are hard and fast rules.
* Use your judgement to determine what improvements are appropriate for your code.
"""

# ---------------------------------------------------------------------------

koop

#!/bin/bash
# Usage
# $ ./install-cert-macos.sh "/path/to/cert"
CERT_PATH="$1"

# First, grab the SHA-1 from the provided SSL cert.
CERT_SHA1=$(openssl x509 -in "$CERT_PATH" -sha1 -noout -fingerprint | cut -d "=" -f2 | sed "s/://g")

# Next, grab the SHA-1s of any standard.dev certs in the keychain.
# Don't return an error code if nothing is found.

pydevops

• 0.1. References
• 0.2. Other cheatsheets
• 0.3. Manage multiple gcloud config configurations
  • 0.3.1. Switch gcloud context with gcloud config
• 0.4. Credentials
• 0.5. info
• 0.6. projects
• 0.7. zones & regions
• 0.8. Organization
• 0.9. billing

girst

#!/bin/bash

# Load balance multiple internet connections. Requires iproute2, awk and grep.
# (C) 2016 Tobias Girstmair, isticktoit.net, GPLv2
# Also useful: speedometer -l  -r eth1 -t eth1 -m $(( 1024 * 1024 * 3 / 2 ))
# Not much user error checking is done - only pass working network connections

# script needs root to work and at least two interfaces to be useful
[ $EUID -eq 0 -a $# -ge 2 ] || {
	echo "Usage (as root): $0 iface1[:weight1] iface2[:weight2] ..." >&2

luhn

"""
Code adapted from and inspired by http://blog.ranman.org/cleaning-up-aws-with-boto3/.

"""
import os
import re
from datetime import datetime, timedelta
import boto3

crearo

from flask import Flask, jsonify, request, make_response
from flask.ext.httpauth import HTTPBasicAuth
from flask_sqlalchemy import SQLAlchemy
from flask import render_template, redirect, url_for
from sqlalchemy import UniqueConstraint, exc

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///memes.db'
app.config['SECRET_KEY'] = 'HALO'

olih

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq