chrisroos

Debugging nginx config

• Use the debug log level to the error_log directive

  • I think this writes to the log for all requests, not just errors.

• Use return 302 http://localhost to force a redirect to localhost.

• Use add_header to write debug info to HTTP headers for later inspection

chrisroos

Comparing performance of different serving mechanisms

Instructions for setting up Asset Manager on EC2 are in https://gist.github.com/chrisroos/bf9e60642395c84e76cb0ecc1cd1272d.

Set-up

# Create 1MB file
$ dd if=/dev/zero of=1MB.dat  bs=1M count=1

chrisroos

• I noticed for the first time this morning that the buttons on the left and right of the screen are to move forward through the book. I'd previously assumed they were for moving backward and forward through the book.

• I plugged the device into my laptop and copied a PDF (printed from Pocket) to the documents folder. This showed up on the homescreen and I was able to read it.

• I changed the email address for my device to something more friendly and emailed a PDF (printed from Pocket) to it. It showed up on the homescreen of my Kindle in no time. And shows up in "My Content" at Amazon.com.

chrisroos

ubuntu@ip-172-30-0-184:~/asset-manager$ ab -n1000 "http://asset-manager.ec2.gov.uk/media/597a14f18456ae0dfd5ad8b8/1MB.dat"
This is ApacheBench, Version 2.3 <$Revision: 1528965 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking asset-manager.ec2.gov.uk (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests

chrisroos

• AMI: ubuntu/images/hvm-ssd/ubuntu-trusty-14.04-amd64-server-20170727 (ami-1e749f67)
• t2.large instance

$ sudo apt-get update
$ sudo apt-get install -y git

$ sudo apt-get install -y gcc build-essential
$ sudo apt-get install -y libssl-dev libreadline-dev zlib1g-dev

chrisroos

Creating files of n size

dd if=/dev/zero of=1MB.dat  bs=1m count=1

---

Upload file to Asset Manager

chrisroos

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'liquid'
end

require 'date'
require 'liquid'

chrisroos

"Moving" files between Google Drive accounts

The way to do it seems to be to share the files from the source account to the destination account, copy the files in the destination account and then remove the files from the source account.

Sharing the files with the destination account and then removing them from the source account results in them being removed from the destination account.

Sharing the files with the destination account, adding them to My Drive in the destination account and then removing them from the source account results in them being removed from the destination account.

chrisroos

This demonstrates the difference in behaviour when using the public|protected|private_methods methods to check for the presence of a module method defined on Kernel or Object versus those defined in another Module.

chrisroos

Using IFTTT to handle future and recurring tasks

• Store the tasks in our "GFR Tasks" Google calendar.

  • Relatively fine grained control over dates of tasks (e.g. second Wednesday of each month)

• IFTTT applet turns these events into cards in Trello

  • Our applets
  • "If any event starts on GFR Tasks, then create a card in - Go Free Range board"
  • Fires 15 minutes before the start date of a task, i.e. 23:45 for all day tasks