sometimescasey

convert -delay 20 -loop 0 -dispose previous *.png myimage.gif

sometimescasey

Django Heroku setup notes

How to do normal Django manage commands?

I.e. create superuser, check migrations, run migrations...

Also, don't make migrations on the Heroku machine. Make them locally and commit to version control.

heroku run python manage.py showmigrations --app myapp
heroku run python manage.py migrate --app myapp
heroku run python manage.py createsuperuser --app myapp

sometimescasey

Renewing SSL certificates for https loading in Bitnami AWS Lightsail Ghost blog

Regenerate server.crt and server.key

Once you've already set up your certs using bncert-tool, the thing you actually need to replace every 30 days is the base certificates which you created by following https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-using-lets-encrypt-certificates-with-nginx.

You'll need to do the DNS challenges again using TXT records in Lightsail.

Make a note of the expiry date.

Replace symlinks (example below is for my Ghost blog, ymmv):

sometimescasey

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch localhost",
            "type": "chrome",
            "request": "launch",

sometimescasey

Note

This is a note to self of setup steps when purchasing a new domain on Namecheap, pointing its DNS to Route 53, requesting an SSL certificate, and setting up a CloudFront distribution for it to point to an S3 bucket.

1. Point NameCheap domain Custom DNS to Route 53

Create a new hosted zone for the new domain in Route 53. Will be given the correct nameservers to use under record type 'NS'. Add these values in NameCheap under 'Custom DNS'.

2. Request new SSL certificate for example.com and *.example.com

sometimescasey

I always forget the basics of screen:

See what's currently running

screen -ls

Make a new named screen session, do stuff, detach

screen -S nameofsession

sometimescasey

I always forget how to do this on a new system:

export CUDA_PATH=/usr/local/cuda-9.2
export CUDA_HOME=/usr/local/cuda-9.2
export LD_LIBRARY_PATH=/usr/local/cuda-9.2/lib64

sometimescasey

/* 
Summer 2018
CSC263 Assignment 4 Question 7
CLRS Problem 21-1, Offline-Minimum
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "disjoint.h"

sometimescasey

/*
CLRS 21.3-4
Suppose that we wish to add the operation PRINT-SET(x), which is given a node x
and prints all the members of x’s set, in any order. Show how we can add just
a single attribute to each node in a disjoint-set forest so that PRINT-SET(x) takes
time linear in the number of members of x’s set and the asymptotic running times
of the other operations are unchanged. Assume that we can print each member of
the set in O(1) time.
*/

sometimescasey

/* 
Summer 2018
CSC263 Assignment 4 Question 2
CLRS 22-4

Let G = (V,E) be a directed graph in which each vertex u in V is labeled with
a unique integer L(u) from the set {1, 2, ...|V|}. For each vertex u in V , let
R(u) = {v in V: u has a path to v} be the set of vertices that are reachable from u. 

Define min(u) to be the vertex in R(u) whose label is minimum, i.e., min(u) is the vertex v such that L(v) = min{L(w): w in R(u)}. Give an O(V+E) algorithm that