digitalronin

Theory: LB sends pods traffic after they've moved off a node

This would explain a few errors when the node recycler replaces a node which happens to have an ingress controller pod running on it.

Test

In a test cluster (3 worker nodes)

• deploy a "hello world" ruby app

digitalronin

# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem "aws-sdk-route53", "~> 1.40"

digitalronin

Deploy a Golang web application to Heroku

The [Go programming language], often referred to as "golang", has a lot of well-deserved traction in the devops community. Many of the most popular tools such as [docker], [kubernetes], and [terraform] are written in go, but it can also be a great choice for building web applications and APIs.

In this post, I'm going to show you how to develop a simple web application in go, package it as a lightweight docker image, and deploy it to [Heroku].

Go Modules

I'm going to use go's built in module support for this article.

digitalronin

package main

cost_centers := [
  "marketing",
  "hr"
]

array_contains(arr, elem) {
  arr[_] = elem
}

digitalronin

apiVersion: v1
kind: Namespace
metadata:
  name: hello-world-test
  annotations:
    awesome-company/cost-center: non-existent-cost-center

digitalronin

package main

cost_centers := [
  "marketing",
  "hr"
]

array_contains(arr, elem) {
  arr[_] = elem
}

digitalronin

Automated testing tools for Infrastructure as Code

In software development, automated testing has long been accepted as best practice.

Test-driven development (TDD) or behavior-driven development (BDD) approaches often go as far as writing tests for functionality before it is implemented, and continuous integration and continuous delivery (CI/CD) pipelines are commonplace, automatically running tests against your codebase whenever a change is pushed to version control.

digitalronin

Build a GraphQL-powered blog wth Dgraph and Slash GraphQL

In this article, I'm going to walk you through building a proof of concept blog powered by Slash GraphQL.

Graph databases are a fascinating way to model the information in a system where the relationships (edges) between pieces of data (nodes) are first-class entities of the system. This is a different approach to the more common relational database (RDBMS) model, where the relationships between records are implied. For example, "this user owns this post because `user.id ==

digitalronin

apiVersion: cert-manager.io/v1alpha3
kind: Certificate
metadata:
  name: helloworld-dstest.live-1.cloud-platform.service.justice.gov.uk
  namespace: dstest
spec:
  secretName: dstest-ssl-cert
  issuerRef:
    name: letsencrypt-production
    kind: ClusterIssuer

digitalronin

#!/bin/bash

# Erase the current working copy and start again from a fresh one.

# WARNING: Very destructive, with no undo.

REPO=$(basename $(git rev-parse --show-toplevel))
CHECKOUT_URL=$(cat .git/config | grep url | sed 's/.*= //')

cd ..