Silvio Vaz 7vs

Setup the Rails project with ActiveAdmin using Webpacker: rails g active_admin:install --use_webpacker
Setup Trix editor for ActiveAdmin:
- Execute: bin/rails action_text:install
- Add Javascript library to app/javascript/packs/active_admin.js:

require("trix")
require("@rails/actiontext")

Add style library to app/javascript/stylesheets/active_admin.scss:

Introductory resources

High level overview https://yogthos.github.io/ClojureDistilled.html
An Animated Introduction to Clojure https://markm208.github.io/cljbook/
Interactive tutorial in a browser https://tryclojure.org/
Interactive exercises http://clojurescriptkoans.com/
Clerk notebooks with introductory examples https://github.clerk.garden/anthonygalea/notes-on-clojure
More interactive exercises https://4clojure.oxal.org/
Lambda Island tutorials https://lambdaisland.com/
Functional Programming with Clojure resources https://practicalli.github.io/

sudo useradd --system --shell /bin/false node_exporter

curl -fsSL https://github.com/prometheus/node_exporter/releases/download/v1.3.1/node_exporter-1.3.1.linux-amd64.tar.gz \
  | sudo tar -zxvf - -C /usr/local/bin --strip-components=1 node_exporter-1.3.1.linux-amd64/node_exporter \
  && sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

Apache Kafka is a highly-scalable publish-subscribe messaging system that can serve as the data backbone in distributed applications. With Kafka’s Producer-Consumer model it becomes easy to implement multiple data consumers that do live monitoring as well persistent data storage for later analysis. You can assume that RabbitMQ is similar to Kafka, You do get an option for message-sending or Broadcasting. The installation process for OSX is as below.

The best way to install the latest version of the Kafka server on OS X and to keep it up to date is via Homebrew.
```
 brew search kafka
 brew install kafka 
```
The above commands will install a dependency called zookeeper which is required to run kafka. Start the zookeeper service.

zkserver start

Preamble

On OS/X Sierra, after recently running a brew update I started receiving the error message Sorry, you can't use byebug without Readline when trying to run some rake tasks in my ruby project folder. I observed this in projects and gems that include byebug or pry in their Gemfile or gem.spec. I've found in my googling that many begin encountering this error message after running a brew update but there are other triggering conditions as well.

>> rake aws:show_config
WARN: Unresolved specs during Gem::Specification.reset:
      mime-types (>= 0)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
 Sorry, you can't use byebug without Readline. To solve this, you need to

First, add pry-rails to your Gemfile:
https://github.com/rweng/pry-rails

gem 'pry-rails', group: :development

Then you'll want to rebuild your Docker container to install the gems

Pipelines

Many Pipelines operations can be performed via the CLI, which requires the Pipelines plugin for the Heroku Toolbelt. To install:

% heroku plugins:install heroku-pipelines
% heroku help pipelines

% heroku apps:create une-pipe-staging

	# non root user example for alpine
	#
	# usage:
	# $ docker build --build-arg "USER=someuser" --tag test .
	# $ docker run --rm test

	FROM alpine

	ARG USER=default
	ENV HOME /home/$USER

	After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
	The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

	Database files have to be updated before starting the server, here are the steps that had to be followed:

	# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
	brew unlink postgresql
	brew install [email protected]
	brew unlink [email protected]
	brew link postgresql

	# `have_attr_reader` matcher for attr_reader
	RSpec::Matchers.define :have_attr_reader do \|field\|
	match do \|object_instance\|
	object_instance.respond_to?(field)
	end

	failure_message do \|object_instance\|
	"expected attr_reader for #{ field } on #{ object_instance }"
	end