| With instance EC2 T2.micro 1.0 GiB 1 vCPUs (http://www.ec2instances.info/?cost_duration=monthly&selected=t2.micro) | |
| Here are the steps I took to enable swap space: | |
| dd if=/dev/zero of=/swapfile bs=1M count=512 | |
| mkswap /swapfile | |
| chmod 600 /swapfile | |
| swapon /swapfile | |
| You also have to edit your fstab file so the swap is available after reboot: |
| Optimize webpage speed: | |
| - Tools: Google Pagespeed Insight, Gtmetrix.com, Webpagetest.org, Image Analysis of Webpagetest.org | |
| - Tools mobile: Webpagetest.org, https://testmysite.thinkwithgoogle.com/ | |
| 1. Using sprite CSS for all images | |
| 2. Optimize images using tool Tinypng.com | |
| 3. Eliminate render-blocking JavaScript in above-the-fold content | |
| - Use content_for custom js in Rails |
| Config chung | |
| Initializer | |
| - Để các code khởi tạo trong thư mục config/initializers. Các đoạn code để trong thư mục này sẽ tự động execute khi server khởi động. | |
| - Để các code khởi tạo thành các file riêng theo gem. Ví dụ: carrierwave.rb, devise.rb… | |
| Global variable | |
| - Các biến global như email dùng để gửi mail, hostname, … nên để trong các file config/enviroments/development.rb,config/enviroments/production.rb |
| I. INTRO | |
| - Only valids for TEST env | |
| - All cards below have expiration dates and security codes: | |
| | Expiration Date | CVV2 / CVC3 | CID (American Express) | | |
| | 08/2018 | 737 | 7373 | | |
| | 10/2020 | 737 | 7373 | | |
| II. CARDS | |
| = Mastercard | |
| | Card Number | Card Type | Issuing Country | |
| Restart with Capistrano: | |
| cap production resque:restart | |
| cap production resque:scheduler:restart | |
| If you use resque-scheduler, when you have new job in resque_scheduler.yml, you will need restart redis server to verify it: | |
| sudo /etc/init.d/redis_6379 stop | |
| sudo /etc/init.d/redis_6379 start |
gem 'rack-mini-profiler', require: false, group: :development
Move config.middleware.use Rack::Deflater from config/application.rb to config/environments/production.rb
Edit config/initializers/rack_profiler.rb:
if Rails.env.development?
class ProductPhoto < ActiveRecord::Base
belongs_to :product
has_attached_file :photo, styles: {large: '1024x1024', medium: '300x300', small: '150x150#', item: '150x'}
validates_attachment_content_type :photo, content_type: /\Aimage/
validates :photo, presence: true
end> pry
you will redirected to pry console:
pry(main)
| 1) Create a linux user and set password | |
| sudo adduser read_access | |
| .. then enter your password for this user | |
| 2) Limit permission for the user (option) | |
| .. normally, this user only has root permission on it's directory. (/home/read_access) | |
| 3) Set read-only role for this user to use Postgresql | |