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This will create a proxy server in whatever your availability zone your VPC is in. For me, that's us-east-1b. For you, that may be something different. Steps 10+ should more or less work regardless of your provider since those steps cover the setup and configuration of TinyProxy.

1. Click the Launch Instance button.
2. Choose Ubuntu Server 14.04 LTS (HVM), SSD Volume Type. This isn't strictly necessary. If you choose another OS, check its documentation for how to install new packages.
3. On the Choose an Instance Type screen, select t2.micro. It's Free Tier eligible.
4. Click the Next: ... buttons until you reach the Configure Security Group screen.
   • You may wish to reduce the amount of storage on the Add Storage screen. This is optional.
   • You may wish to add a tag on the Tag Instance screen. This is also optional.
5. On the Configure Security Group screen:

• Select Create a new security group.

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Handling errors in Rails with ActiveSupport

Rails provide a clean way to rescue exceptions in a controller with a defined method.

Let's suppose that you have a class with method create that could raise ActiveRecord::RecordInvalid exception:

class ExampleController < ApplicationController

    def create

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Organizing lib directory with static services

base_service.rb

    module Core end

    module Core::BaseService
 extend self

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Checking permissions in Rails

What we will use:

• CanCan - Authorization Gem for Ruby on Rails (https://github.com/ryanb/cancan)
• Response module (will be covered later)

Let's just start with an example

Let's suppose that you have a method do_something, which could be preformed only by user who's matching permissions view_payment_info, if options[:some_key] isn't

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wget https://github.com/rancher/convoy/releases/download/v0.5.2/convoy.tar.gz
tar xvzf convoy.tar.gz
sudo cp convoy/convoy convoy/convoy-pdata_tools /usr/local/bin/
sudo mkdir -p /etc/docker/plugins/
sudo bash -c 'echo "unix:///var/run/convoy/convoy.sock" > /etc/docker/plugins/convoy.spec'

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wget https://raw.githubusercontent.com/rancher/convoy/master/tools/dm_dev_partition.sh
bash dm_dev_partition.sh --write-to-disk $DISK_MOUNTPOINT

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convoy daemon --drivers devicemapper --driver-opts dm.datadev=$DISK_MOUNTPOINT\1 --driver-opts dm.metadatadev=$DISK_MOUNTPOINT\2 &

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[Unit]
Description=Convoy volume management service
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=5
ExecStart=convoy daemon --drivers devicemapper --driver-opts dm.datadev=$DISK_MOUNTPOINT\1 --driver-opts dm.metadatadev=$DISK_MOUNTPOINT\2

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docker volume create --driver convoy --opt size=100m test

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# install convoy

wget https://github.com/rancher/convoy/releases/download/v0.5.2/convoy.tar.gz
tar xvzf convoy.tar.gz
sudo cp convoy/convoy convoy/convoy-pdata_tools /usr/local/bin/
sudo mkdir -p /etc/docker/plugins/
sudo bash -c 'echo "unix:///var/run/convoy/convoy.sock" > /etc/docker/plugins/convoy.spec'

# download and execute preparation script