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# Show firewall
sudo ufw status verbose

# Open port
Nếu bạn muốn mọi người trên internet truy cập được vào máy chủ của bạn thì bạn cần mở port trong firewall để cho phép họ truy
thông qua port vừa mở.

sudo ufw allow 22/tcp

# List open port

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Kiểm tra model có bị lỗi abc trên thuộc tính xyz trong rails
model.errors.of_kind? :xyz, :abc //true or false

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# Install
# via http://askubuntu.com/questions/510056/how-to-install-google-chrome

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - 
sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt-get update 
sudo apt-get install google-chrome-stable


# Update

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Command to add public key from local to server
ssh-copy-id -i public_key_file_name user@server

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Use cmd: dmesg, 

You can use grep, tail, less
dmesg | tail -n 30

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unzip file.zip -d dir_path

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tar to extract files from a tarball with option directory
tar -zxvf Project4x.tar.gz -C dir_path

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THOR_MERGE="code -d $1 $2" rails new . -d mysql

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JWT Auth + Refresh Tokens in Rails

This is just some code I recently used in my development application in order to add token-based authentication for my api-only rails app. The api-client was to be consumed by a mobile application, so I needed an authentication solution that would keep the user logged in indefinetly and the only way to do this was either using refresh tokens or sliding sessions.

I also needed a way to both blacklist and whitelist tokens based on a unique identifier (jti)

Before trying it out DIY, I considered using:

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https://ruby-doc.org/stdlib-3.1.2/libdoc/English/rdoc/English.html