app_deployment_ubuntu_fastapi

1. Get an ubuntu VM, setup authorization, create a new user and add it to sudoers.

   adduser emre
   usermod -aG sudo emre

2. Update the machine via sudo apt update && sudo apt upgrade -y
3. Install python and virtualenv if not available.
4. Install and setup postgresql:
   • sudo apt install postgresql postgres-contrib -y
   • Disable peer authentiacation to access it from other users:

     su - postgres
     psql -U postgres
     \password postgres
     \q

     cd /etc/postgresql/12/main
     sudo vi postgresql.conf # here change listen_addresses = ['*']. This is not best practise. Consider limiting access to certain IP addresses/domains.
     sudo vi pg_hba.conf
     # here change the line [local all postgres peer] to [local all postgres md5]
     # change the line [host all all 127.0.0.1/32 md5] to [host all all 0.0.0.0/0 md5] --> meaning any IP address
     # change the line [host all all ::1/128 md5] to [host all all ::/0 md5]
     systemctl restart postgres # restart postgres app

5. Setup project folder:

   mkdir app_name
   cd app_name
   virtualenv venv
   source venv/bin/activate
   mkdir src
   cd src
   git clone <git_repo.git> . # put dot to prevent new folder with the repo name
   pip install -r requirements.txt # if you get any errors, look for line with #include <libname.h>, then sudo apt install it, and retry

6. Setup environment variables:

   cd ~
   touch .env
   vi .env # then copy paste .env file content from local to VM
   vi .profile # add this line to the end of file (enable env vars at reboot): set -o allexport; source /home/emre/.env; set +o allexport

7. Update alembic tables:

   cd ~/app_name/src/
   alembic upgrade head

8. Setup Gunicorn for automated app running on machine reboot:

   pip install gunicorn httptools uvloop
   # setup service for autostart of api on reboot
   cd /etc/systemd/system
   sudo vi api.service # copy content of ~/app_name/src/gunicorn.service file and modify as needed
   sudo systemctl enable api # this enables starting of service on reboot
   systemctl restart api
   systemctl status api # should look active

To observe the app process in VM:

ps -aef | grep -i gunicorn