Ben Klein robobenklein

Looking to create a Software RAID 1 setup for your 2-disk server on Ubuntu Server 20.04?

Let's start with the basics: the official guide by Ubuntu (https://ubuntu.com/server/docs/install/storage) is outdated/wrong. And as of March 2021 it's possible that there's a bug as well with how the bios_grub partitions are created when using multiple disks.

Now on to the solution:

Select "Custom storage layout" when you reach the storage configuration step of the installer.
If the disks have existing partitions, click on each disk under AVAILABLE DEVICES and then select REFORMAT. This will (temporarily) wipe out the partitions.

See imgur / linked pastebin and github mirror for 1-8 → 1-8 balancers. Creator: raynquist, github mirror linked in Balancers Illustrated: 1 through 8 balancers explained, imgur album linked in Balancer Book Update (Summer 2019)

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Problem: When linking to the raw version of a gist, the link changes with each revision.

Solution:

To return the first file from a gist: https://gist.github.com/[gist_user]/[gist_id]/raw/

Example: https://gist.github.com/atenni/5604522/raw/
Works even when you change the filename.

To get a file from multi–file gist: https://gist.github.com/[gist_user]/[gist_id]/raw/[file_name]

	import time
	import psutil
	import multiprocessing as mp
	from multiprocessing import Process

	def f(thread, duty, freq, q):
	p = psutil.Process()
	p.cpu_affinity([thread])

	while True:

	# The Zshell function will display the given message under-prompt (as a kind of notification).
	# It has an optional delay first argument: "@sleep:<secnods with fractions>". If given, then
	# the message will wait in background before showing for the specified time.
	#
	# Usage:
	# deploy-message @msg "Hello world"
	# deploy-message "Hello world"
	# deploy-message @msg 1234 # I.e. the "@msg" is needed for number-only messages, otherwise optional
	# deploy-message @sleep:5.5 "Hello world"

	// Your browser must support ES6 async / await, Promises, and Template Strings for this to work.
	// Do not remove the sleeps to make it faster. They are there to allow time for the Ajax calls that Canvas makes to process.
	// If you are on a slow connection, you might need to increase the length of the sleep calls.
	// I've also made it up to you to click the send button. Be sure to check that you pasted your invite url correctly.
	// To run this:
	// * Go to the page on Canvas where you can see your messages from the class you want to send the invite to.
	// * Open your browser's console using F12 or by right clicking and then selecting "Inspect Element".
	// * Paste the below code into your console window and hit enter.
	// * Then enter add_students("INSERT_INVITE_URL_HERE"); into your console window and hit enter.
	// * The script will run and then all you have to do is proofread and hit send!

	#include <time.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <pthread.h>
	#include <string.h>
	#include <assert.h>

	#define tic() do { struct timespec ts_start, ts_end; clock_gettime(CLOCK_MONOTONIC, &ts_start)
	#define toc() clock_gettime(CLOCK_MONOTONIC, &ts_end); \
	printf("%lfs\n", (ts_end.tv_sec - ts_start.tv_sec) + (double)(ts_end.tv_nsec - ts_start.tv_nsec)/1e9); } \