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# yum update
# yum install gcc make kernel-devel bzip2

# reboot

# mkdir -p /media/cdrom
# mount /dev/sr0 /media/cdrom
# sh /media/cdrom/VBoxLinuxAdditions.run

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CentOS 7

1. Disable SE Linux

sudo vi /etc/sysconfig/selinux

Then change the directive SELinux=enforcing to SELinux=disabled
Reboot server.

2. Create deploy user

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wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
echo deb https://pkg.jenkins.io/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list
sudo apt-get update
sudo apt-get install jenkins

sudo service jenkins start

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sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker

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class MyController < ApplicationController
  def options
    options = {}
    available_option_keys = [:first_option, :second_option, :third_option]
    all_keys = params.keys.map(&:to_sym)
    set_option_keys = all_keys & available_option_keys
    set_option_keys.each do |key|
      options[key] = params[key]
    end
    options

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CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; GRANT ALL PRIVILEGES ON . TO 'root'@'localhost' WITH GRANT OPTION;

Stop mysqld and restart it with the --skip-grant-tables option.
Connect to the mysqld server with just: mysql (i.e. no -p option, and username may not be required).

Issue the following commands in the mysql client:

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# Backup
docker exec CONTAINER /usr/bin/mysqldump -u root --password=root DATABASE > backup.sql

# Restore
cat backup.sql | docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE

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defaults write .GlobalPreferences com.apple.mouse.scaling -1

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require 'active_record/connection_adapters/abstract_mysql_adapter'

module ActiveRecord
  module ConnectionAdapters
    class AbstractMysqlAdapter
      NATIVE_DATABASE_TYPES[:string] = { :name => "varchar", :limit => 191 }
    end
  end
end

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def dirReduc(arr)
  dir = {"NORTH" => "SOUTH", "SOUTH" => "NORTH", "WEST" => "EAST", "EAST" => "WEST"}
  length = arr.length
  result = []
  arr.each do |w|
    if result.last != dir[w]
      result << w
    else
      result.pop
    end