jeanfbrito

Ubuntu with Nginx + Ruby 2.0.0 + PostgreSQL 9.1 + Passenger + Papistrano

Update the system

sudo apt-get update

Install some dependencies

foosel

First experiments with NodeMCU to publish the current settings of my adjustable height working desk to MQTT.

NodeMCU can be found here: https://github.com/nodemcu/nodemcu-firmware

Note that you'll need a current version with support for floats (which the ultrasonic sensor library utilizes), I'm using 0.9.5 2015-03-18 with float support myself.

Support for the HC-SR04 sensor in NodeMCU can be found here: https://github.com/sza2/node_hcsr04

I provided my slightly adjusted version which makes measuring a non-blocking afair, allowing for callbacks when the measurement completes.

rock3m

--- Config
SSID       = "YOUR_WIFI_NAME"
PASSWORD   = "YOUR_WIFI_PASSWORD"
TIMEOUT    = 30000000 -- 30s

--- Station modes
STAMODE = {
  STATION_IDLE             = 0,
  STATION_CONNECTING       = 1,
  STATION_WRONG_PASSWORD   = 2,

fernandosavio

{
  	"Acre": ["Acrel\u00e2ndia","Assis Brasil","Brasil\u00e9ia","Bujari","Capixaba","Cruzeiro do Sul","Epitaciol\u00e2ndia","Feij\u00f3","Jord\u00e3o","M\u00e2ncio Lima","Manoel Urbano","Marechal Thaumaturgo","Pl\u00e1cido de Castro","Porto Acre","Porto Walter","Rio Branco","Rodrigues Alves","Santa Rosa do Purus","Sena Madureira","Senador Guiomard","Tarauac\u00e1","Xapuri"],
	"Alagoas": ["\u00c1gua Branca","Anadia","Arapiraca","Atalaia","Barra de Santo Ant\u00f4nio","Barra de S\u00e3o Miguel","Batalha","Bel\u00e9m","Belo Monte","Boca da Mata","Branquinha","Cacimbinhas","Cajueiro","Campestre","Campo Alegre","Campo Grande","Canapi","Capela","Carneiros","Ch\u00e3 Preta","Coit\u00e9 do N\u00f3ia","Col\u00f4nia Leopoldina","Coqueiro Seco","Coruripe","Cra\u00edbas","Delmiro Gouveia","Dois Riachos","Estrela de Alagoas","Feira Grande","Feliz Deserto","Flexeiras","Girau do Ponciano","Ibateguara","Igaci","Igreja Nova","Inhapi","Jacar\u00e9 dos Homens","Jacu\u00edpe","Japaratinga","Jaramataia","Jequi\u00e1 da Praia","Jo

andywer

2018-08-20: Postgres failure

What happened

The PostgreSQL container stopped unexpectedly, was automatically restarted, but suddenly didn't accept any connections anymore. Neither from the API service containers nor from the Macbook over the internet.

Error in logs:

FATAL:  pg_hba.conf rejects connection for host "10.0.1.2", user "postgres", database "******", SSL off

chunlea

Finally, Simple Form support Boostrap 3. 👏

But I found it still dosen't support some components in Bootstrap 3. Or may be in the future. But I can't wait, so I find a solution to support them. It was inspired by heartcombo/simple_form#531 (comment) .

This is a final solution and I used in my project.

christopher-hopper

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where:

telbiyski

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev -y
sudo apt-get install libfreetype6 libfreetype6-dev -y
sudo apt-get install libfontconfig1 libfontconfig1-dev -y
cd ~
export PHANTOM_JS="phantomjs-2.1.1-linux-x86_64"
wget https://github.com/Medium/phantomjs/releases/download/v2.1.1/$PHANTOM_JS.tar.bz2
sudo tar xvjf $PHANTOM_JS.tar.bz2
sudo mv $PHANTOM_JS /usr/local/share
sudo ln -sf /usr/local/share/$PHANTOM_JS/bin/phantomjs /usr/local/bin

iksose

###Creating a REST API using Node.js, Express, and MongoDB

####Installing Node.js

Go to http://nodejs.org, and click the Install button. Run the installer that you just downloaded. When the installer completes, a message indicates that Node was installed at /usr/local/bin/node and npm was installed at /usr/local/bin/npm. At this point node.js is ready to use. Let’s implement the webserver application from the nodejs.org home page. We will use it as a starting point for our project: a RESTful API to access data (retrieve, create, update, delete) in a wine cellar database.

Create a folder named nodecellar anywhere on your file system. In the wincellar folder, create a file named server.js.

rob-murray

columns_that_make_record_distinct = [:some_id, :another_name]
distinct_ids = Model.select("MIN(id) as id").group(columns_that_make_record_distinct).map(&:id)

duplicate_records = Model.where.not(id: distinct_ids)