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# How to Install and Configure Monit on Ubuntu

Monit is a powerful tool for monitoring and managing Unix systems. This guide will walk you through the steps to install and configure Monit on an Ubuntu machine.

## Step 1: Update Your System

Before installing Monit, update your package list and upgrade existing packages:

bash
sudo apt update

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ActiveRecord cheat sheet / EXAMPLES

INSTALL 
=======  
$ gem install activerecord
in GEMFILE: gem ‘activerecord’

REQUIRE 
=======  
require ‘active_record’

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img_paths = ["/Users/workspace/ARVIND/2.jpeg", "/Users/workspace/ARVIND/2.jpeg", "/Users/workspace/ARVIND/REDCAPTIN/2.jpeg"]
Prawn::Document.generate("/Users/workspace/ARVIND/red_captain/my-file.pdf") do |pdf|
  img_paths.each do |img_path|
    # PDF regions involve bounding boxes.
    # The default bounding box is simply the page itself.
    # The :fit option tells Prawn to scale the image to the current
    # bounding box (in other words, the current page)
    pdf.image img_path, :fit => [pdf.bounds.right, pdf.bounds.top]
    # Insert a page break, unless this is the last page

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There are few things to remember 
1) Before upgrading datbase for safer side create backup or current database.
2) Start manatance on so that in middle there should not save any other record which may loss due to databse upgradation 
3) Look into the heroku plans according to your need you can find it here https://devcenter.heroku.com/articles/heroku-postgres-plans

I am sharing example to upgrade my database from Hobby-basic to Standard0	
heroku maintenance:on
heroku addons:create heroku-postgresql:standard-0

heroku pg:copy DATABASE_URL HEROKU_POSTGRESQL_RED_URL --app sushi

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You can kill it using:

sudo fuser -k 80/tcp

service nginx start

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/Users/Topform/.rvm/gems/ruby-2.2.1@bodyboss/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `initialize': could not connect to server: No such file or directory (PG::ConnectionBad)
	Is the server running locally and accepting
	connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

solve by 
   rm /usr/local/var/postgres/postmaster.pid

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Updates and add user

sudo apt-get update && sudo apt-get upgrade -y
adduser passenger
sudo usermod -aG sudo passenger
sudo apt-get install curl nano git libmysqlclient-dev coffeescript gawk g++ gcc make libreadline6-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 autoconf libgmp-dev libgdbm-dev libncurses5-dev automake libtool bison pkg-config libffi-dev -y
login as passenger user, install application
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
\curl -sSL https://get.rvm.io | bash -s stable
source /home/passenger/.rvm/scripts/rvm

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namespace :elasticsearch do
  desc "Install elasticsearch"
  task :install do
    on roles(:app) do
      execute "sudo apt-get update"
      execute "sudo apt-get install openjdk-7-jre-headless -y"
      execute "cd /tmp"
      execute "wget https://download.elasticsearch.org/elasticsearch\
/elasticsearch/elasticsearch-2.3.2.deb"
      execute "sudo dpkg -i elasticsearch-2.3.2.deb"

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$ rake refinery:override view=refinery/pages/*
$ rake refinery:override view=layouts/*
$ rake refinery:override view=refinery/blog/shared/*
$ rake refinery:override view=refinery/blog/posts/*
$ rake refinery:override view=refinery/*
$ rake refinery:override controller=refinery/blog/*
$ rake refinery:override controller=refinery/*
$ rake refinery:override view=refinery/pages/show

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What is the class of Object ?

2.1.0 :013 > Object.class
 => Class 

What is superclass of Module?

2.1.0 :014 > Module.superclass
 => Object