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Prerequisites for server

  1. Install node and npm.
  2. Install headless chrome and it's dependecies. For example:
# Install required packages. 
# Example for ubuntu 20.04 (should also work for other debian-based distributions ):
sudo apt-get install -y libappindicator1 fonts-liberation
sudo apt-get install -f
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo dpkg -i google-chrome*.deb

# Check google chrome version:
google-chrome-stable -version

If checking google chrome version gives you an error, then try:

  • sudo apt --fix-broken install
  • sudo apt install libnss3
  • or restart server
  • or install different node version.
  1. optional Make sure the prerenderer's service keeps working even after reboot. One option is to use supervisor. Example (assuming your server has supervisor already installed):
    • In /etc/supervisor/conf.d create new conf file with following content:
    [program:prerender_worker]
command=/usr/bin/npm start --prefix PATH_TO_DIRECTORY/prerenderer
numprocs=1
autostart=true
autorestart=true
user=NON_ROOT_USERNAME
stdout_logfile=PATH_TO_DIRECTORY/log-prerender-worker.log
    • run supervisorctl stop all && supervisorctl reread && supervisorctl start all as root user
    • Node must be installed globally to run it with supervisor.
    • If process fails to start, try updating npm: npm install -g npm

Install dependencies

npm install

Start server

Run the server node server.js or ALLOWED_DOMAINS="yoursite.com,yoursite.org" node server.js to enable requests for specific domains only. Make sure to restart the service if server reboots.

Check if prerenderer is working

  • Run command curl http://yourdomain.com:3000/render?url=https://www.example.com/
  • or visit the same url on browser.

Links

Prerender documentation