jferris

apiVersion: v1
kind: ConfigMap
metadata:
  name: example
  namespace: default
data:
  APPLICATION_HOST: example.com
  LANG: en_US.UTF-8
  PIDFILE: /tmp/server.pid
  PORT: "3000"

blackjid

Abort if pending migrations with data

We use the awesome gem data-migrate with comes with a handy rake task to check if you have migrations pending. The task is really and extention to the task built in on rails but that also check for pending data migrations.

That rake task is available since version 6.3.0 of data-migrate. If you are stuck in an older version like I was here is a version of the rake task you can put in your project.

rake db:abort_if_pending_migrations:with_data

ProGM

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

giampaolotrapasso

List of links from Designing Event-Driven Systems by Ben Stopford

Designing Event-Driven Systems book by Ben Stopford contains a lot of useful links to papers, books, documentation and definitions related to event driven design and Kafka. I just extracted them as reference for the future and added some groups to show them better.

You can read the book for free

• A Crystal Ball to Prioritise Technical Debt in Monoliths or Microservices: Adam Tornhill's Thoughts
• Brewer's CAP Theorem <= :julianbrowne

mberlanda

require 'bundler'

lockfile = Bundler::LockfileParser.new(Bundler.read_file('Gemfile.lock'))

specs = lockfile.specs
gems_hash = Hash.new.tap do |h|
  specs.each do |s|
    h[s.name] = {
      spec: s,
      dependencies: s.dependencies.map(&:name)

Luzifer

Running docker-compose as a systemd service

Files

File	Purpose
/etc/compose/docker-compose.yml	Compose file describing what to deploy
/etc/systemd/system/docker-compose-reload.service	Executing unit to trigger reload on docker-compose.service
/etc/systemd/system/docker-compose-reload.timer	Timer unit to plan the reloads
/etc/systemd/system/docker-compose.service	Service unit to start and manage docker compose

mgoellnitz

#!/bin/bash
# 
# Copyright 2017-2021 Martin Goellnitz
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,

xbb

Use this as an example on how to start the virtual console without the need of Java Web Start or accessing it from the web interface.
You can use the user and password that you use for the web interface.

You need an old JRE... I used 1.7.0_80 from the Server JRE package, also I have tested successfully 1.7.0_79 with MacOS.
You don't need to install it, just extract it or copy the files in "jre" folder.

Open the viewer.jnlp file that you get by launching the virtual console from the web interface with a text editor.
Note the urls to the jar files. Download the main jar file avctKVM.jar and the libs for your operating system and architecture.
Extract the dlls (.so Linux, .jnilib MacOS) from the jar libs.

alChaCC

Install HomeBrew first

brew update
brew tap caskroom/cask
brew install brew-cask

If you get the error "already installed", follow the instructions to unlink it, then install again:

beepony

require 'net/ftp'
 
def scan(ftp, dir)
  ftp.chdir(dir)
  puts ftp.pwd + "/."
  entries = ftp.list('*')
  entries.each do |entry|
    if entry.split(/\s+/)[0][0,1] == "d" then
      scan(ftp, entry.split.last)
    else