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==========================================          ==========================================
             TMUX COMMAND                                        WINDOW (TAB)
==========================================          ==========================================

List    tmux ls                                     List         ^b w
New          -s <session>                           Create       ^b c
Attach       att -t <session>                       Rename       ^b , <name>
Rename       rename-session -t <old> <new>          Last         ^b l               (lower-L)
Kill         kill-session -t <session>              Close        ^b &

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require 'fileutils'

start_time = Time.now


SOURCE_DB = {
  :name => 'db_name',
  :user => 'db_user',
  :password => 'db_pass',
  :host => 'localhost'

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#!/usr/bin/env ruby

require 'yaml'

PLAYS_DIR = '.'
ROLES_DIR = './roles'

def deps_of(role)
  dep_path = File.join(ROLES_DIR, "#{role}/meta/main.yml")
  File.exists?(dep_path) ? (YAML.load_file(dep_path)['dependencies'] || []) : []

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#!/usr/bin/env ruby
period = ARGV[0]
while true
  f = File.open("access.log", "a")
  value = ["GET", "POST"].sample
  output = "#{Time.now.strftime("%T")} #{value} /test/test/test.html"
  f.puts output
  puts output
  f.close
  sleep(period.to_f)

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  def self.group_by_month_total_chart
    project = {"$project" => 
      {
        "total" => 1,
        "new_created" => 
          { 
            "mo" => {"$month" => "$invoice_date"}
          }
      }
    },

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Setting up a SSL Cert from Comodo

I use Namecheap.com as a registrar, and they resale SSL Certs from a number of other companies, including Comodo.

These are the steps I went through to set up an SSL cert.

Purchase the cert

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WAL-E needs to be installed on all machines, masters and slaves.

How to install WAL-E

Only one machine, the master, writes WAL segments via continuous archiving. The configuration for the master postgresql.conf is:

archive_mode = on
archive_command = 'envdir /etc/wal-e.d/env wal-e wal-push %p'
archive_timeout = 60

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Note: I'm using RVM as my ruby version manager, also yo could use rbenv

• Check ruby version

ruby -v

• To update ruby

rvm install ruby --latest OR rvm install ruby 2.5.0

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#!/bin/bash
GARBAGE="/var/lib/docker/aufs/diff"
du -hd 1 $GARBAGE | sort -hrk 1 | head -25
find $GARBAGE -maxdepth 1 -name *-removing -exec rm -rf '{}' \;

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Google Cloud SDK

Add new config

gcloud init

List configs

gcloud config configurations list