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Modals
AnimationTools.js modals.css animationParams important css classes
Security Group IP addresses
When adding IP addresses or CIDR blocks to VPC security groups - make sure you're using the private IP address and not e.g. a public-facing IP address such as a static one you assigned to a webserver. Only private addresses will work.
March 29
Hi all, hope you're doing well. Been ill with some weird cold/flu-like infection the last week or so, so things have been a little slow, but updates are below as usual. Checkbox design redone, refactoring in progress Since normal HTML checkboxes can't be sty...
Crontabs
Each Deserted Chateau webserver should have the following added to the root crontab: # Add the below lines to your Bitnami LAMP server's root crontab. # These lines should be added to ALL servers, including the primary cronjob server. # Delete temporary s...
Systems Manager / Parameter Store
Example permissions policy This policy grants permission to create, delete and get Parameter Store parameters with the "/Deserted-Chateau/" prefix. { "Version": "2012-10-17", "Statement": [ { "Sid": "VisualEditor0", ...
Lambda
Example permissions policy This policy grants access to create, update, delete and invoke Lambda functions. It only allows executing functions whose names begin with the "Deserted-Chateau-Test" prefix. Note the iam:PassRole permission; when you attach this p...
S3
Example permissions policy This policy allows access to objects within a given bucket. The main use of this is to allow an external CDN provider to authenticate to S3, by creating a user with this policy attached, and allowing the external CDN provider to au...
SES
Example permissions policy { "Version": "2012-10-17", "Statement": [ { "Sid": "VisualEditor0", "Effect": "Allow", "Action": [ "ses:SendEmail", "ses:SendTemplatedEmail"...
April 13
Hi all, hope you're doing well. The illness I had in the last update has persisted; I went to the doctor, and they've told me I have the aftereffects of a nasty sinus infection. Apparently the symptoms will persist for 2-3 months, so I'll just have to deal wit...
Route 53
Homepage https://aws.amazon.com/route53/ What is it? AWS' DNS (domain name system) service. It handles managing DNS records for a domain, and also acts as a domain name registrar, i.e. you can buy/manage your ownership of a domain name with it. Why did we ...
Systems Manager
Homepage https://aws.amazon.com/systems-manager/ What is it? AWS Systems Manager is one of the 'bigger' AWS services: it covers a whole load of things, from analysing incidents, system data analytics and a ton of other stuff. Why did we choose it? Specifi...
SNS (Simple Notification Service)
Homepage https://aws.amazon.com/sns/ What is it? A "pub/sub" (publish/subscribe) service for notifications, basically acting as a place to store application-related notifications. Why did we choose it? It's a necessary part of good practice when using AWS...
SQS (Simple Queue Service)
Homepage https://aws.amazon.com/sqs/ What is it? A service for queuing messages of any kind to be processed later. Why did we choose it? It's a necessary part of good practice when using SES (the email service). What do we use it for? Receiving notifica...
Variable evaluation and race conditions
Suppose we have some code like this: // elementsArray is an array of 10 jQuery objects for (let i = 0; i < elementsArray.length; i++) { let elementID = elementsArray[i].attr("id"); // Fade in the element over 400ms. $(`#${elementID}`).fadeIn(400, fu...
Configuration Values
Deserted Chateau's webservers have various configuration values that are stored in the main database. These values are cached without an expiry time in Redis, with the SITE:::WEBSERVER:::CONFIGURATION key as a JSON-encoded string. The webservers always retrie...
Refreshing cached values
Implementing an animated preview generator
Generating animated previews with ffmpeg The basic command for animated preview generation looks like this: /opt/bin/ffmpeg \ -y \ -i "yourvideo.mp4" \ -ss 00:00:00.100 \ -filter:v scale=trunc(oh*a/2)*2:480,fps=20 \ -c:v libx264 \ -preset ultrafast \ ...
Turnstile
Homepage https://www.cloudflare.com/en-gb/products/turnstile/ What is it? A CAPTCHA alternative, that doesn't require users to solve puzzles. Why did we choose it? It has a solid privacy policy, does not collect personal data, and presents less of a pain ...
The MariaDB Node.js connector
Using the batch query function When using batch queries via conn.batch, be aware that attempting to run a batch with a dataset of exactly one will cause it to fail with a rather unhelpful error message: SqlError: (conn=229016, no: 1295, SQLState: HY000) This...
EventBridge
Homepage https://aws.amazon.com/eventbridge/ What is it? A service for scheduling and triggering events, either for some specific action, or on a schedule. Why did we choose it? It integrates well with AWS Lambda, so we can use it to invoke Lambda functio...