JoshuaGross

Freeing up extra disk space inside a Docker container

Sometimes while running a command inside of a docker container, the container itself will run out of disk space and things can fail (sometimes in strange ways). This is not a guide on how to allocate resources, but a quick cookbook on how to free up disk space inside a container. See below for links to more resources and reading.

If at all possible, just run Docker with increased disk space

See Limit disk size and bandwidth of a Docker container.

Resize an aufs volume

JoshuaGross

Keybase proof

I hereby claim:

• I am joshuagross on github.
• I am joshuagross (https://keybase.io/joshuagross) on keybase.
• I have a public key whose fingerprint is DC5B 28F6 29F9 D09B BFB9 7FC3 ABF0 5BA3 4B8D 6DFD

To claim this, I am signing this object:

JoshuaGross

A list of interesting URLs

... and a short description of interesting things learned within:

• 2015-12-25: Beautiful Decay of AOL: someone going over old AOL CDs and "reviewing" the contents of AOL pages.
• 2015-12-25: Specialising Dynamic Techniques for Implementing The Ruby Programming Language: Chris Seaton's PhD thesis - embracing metaprogramming in Ruby to optimize Ruby VMs.
• 2015-12-25: People around the world are eating banana peels because they know something that Westerners do not: basically eating banana peels is better for you and the environment.
• 2015-12-26: Amateur Hour: a guide to how training for beating amateur cycling records works. tl;dr: excruciating, requires intense focus. Train things at 90% of maximum for shorter intervals.
• 2015-12-26: [Attritional Interfaces](https://samgentle.com

JoshuaGross

# Copyright (c) 2016, Swift Navigation, All Rights Reserved.
# Released under MIT License.
#
# Find documentation of parameters here:
# http://aprs.gids.nl/nmea/#gga
#
# time_t is a `time_struct` (https://docs.python.org/2/library/time.html)
# alt_m, geoidal_sep_m are in meters
import time
from math import floor

JoshuaGross

Python "image not found" error resolution

This is an error that seems to occur on OS X El Capitan. You may see errors like this that did not occur before:

$ ./my_python_script.py
Traceback (most recent call last):
  File "./my_python_script.py", line 17, in <module>
    import psycopg2
 File "/Users/joshuagross/miniconda2/envs/my_env/lib/python2.7/site-packages/psycopg2/__init__.py", line 50, in 

JoshuaGross

-- can be used in ghci
import qualified Data.ByteString as B
import Numeric (showHex)
import qualified Data.ByteString.Lazy as LBS
import qualified Data.Binary               as B

-- encode some object to a binary ByteString
let s = (B.encode someObjectThatHasBinaryInstance)

let prettyPrint = P.concatMap ((\x -> "0x"++x++" ") . flip showHex "") . B.unpack :: B.ByteString -> String

JoshuaGross

Installing

Add this line to a Dockerfile to install and configure DogStatsD in the container. Requires that apt-get is available on the system.

This script will install curl in your environment but not remove it; you should uninstall it if you don't want it available in the container.

These script uses md5sum to validate all external scripts that are

JoshuaGross

/**
 * Copyright 2017, Joshua Gross, All Rights Reserved.
 * Released under the MIT license.
 */

/**
 * Each BST is represented as its own root.
 * BSTs have no rebalancing, so tree shape can get gnarly real quick!
 */
function BST (key, value, left, right) {

JoshuaGross

#!/usr/bin/env node

const mode = process.argv[2];
const startDate = process.argv[3];
const endDate = process.argv[4];
const vacationDays = parseInt(process.argv[5], 10);
const sugar = require('sugar-date');
const moment = require('moment');

const parsedStartDate = moment(sugar.Date.create(startDate));

JoshuaGross

function transposeMatrix (m) {
  return m.map((_, c) => m.map(r => r[c]));
}

console.log(transpose([[1,2,3],[4,5,6],[7,8,9]]));