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pyfedi/INSTALL.md
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Contents

Setup Database

Install postgresql

PieFed should work on version 13.x or newer. If you have errors running flask init-db, check your postrgesql version.

Install postgresql 16:

For installation environments that use apt as a package manager:

sudo apt install ca-certificates pkg-config
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'
sudo apt update
sudo apt install libpq-dev postgresql

Create new DB user

Choose a username and password. To use 'pyfedi' for both:

sudo -iu postgres psql -c "CREATE USER pyfedi WITH PASSWORD 'pyfedi';"

Create new database

Choose a database name, owned by your new user. For a database called and owned by 'pyfedi':

sudo -iu postgres psql -c "CREATE DATABASE pyfedi WITH OWNER pyfedi;"

Install Python Libraries

Pre-requisites for Mac OS
Notes for Windows (WSL2)

For installation environments that use apt as a package manager:

sudo apt install python3-pip python3-venv python3-dev python3-psycopg2

Install additional requirements

For installation environments that use 'apt' as a package manager:

sudo apt install redis-server
sudo apt install git
sudo apt install tesseract-ocr

Setup PyFedi

  • Clone PyFedi
git clone https://codeberg.org/rimu/pyfedi.git
  • cd into pyfedi, set up and enter virtual environment
cd pyfedi
python3 -m venv ./venv
source venv/bin/activate
  • Use pip to install requirements
pip install wheel
pip install -r requirements.txt

(see Notes for Windows (WSL2) if appropriate)

Setup .env file

  • Copy env.sample to .env
  • Edit .env to suit your server.
  • Using the same username, password, and database name as used when setting up database, set the connection up, something like this: 
    DATABASE_URL=postgresql+psycopg2://username:password@localhost/database_name

Extra info

  • SERVER_NAME should be the domain of the site/instance. Use 127.0.0.1:5000 during development unless using ngrok.

  • CACHE_TYPE can be FileSystemCache or RedisCache. FileSystemCache is fine during development (set CACHE_DIR to /tmp/piefed or /dev/shm/piefed) while RedisCache should be used in production. If using RedisCache, set CACHE_REDIS_URL to redis://localhost:6379/1

  • CELERY_BROKER_URL is similar to CACHE_REDIS_URL but with a different number on the end: redis://localhost:6379/0

  • MAIL_* is for sending email using a SMTP server. Leave MAIL_SERVER empty to send email using AWS SES instead.

  • AWS_REGION is the name of the AWS region where you chose to set up SES, if using SES. SES credentials are stored in ~/.aws/credentials. That file has a format like

    [default]
aws_access_key_id = JKJHER*#KJFFF
aws_secret_access_key = /jkhejhkrejhkre
region=ap-southeast-2

    You can also use environment variables if you prefer.

  • Test email sending by going to https://yourdomain/test_email. It will try to send an email to the current user's email address. If it does not work check the log file at logs/pyfedi.log for clues.

Initialise database, and set up admin account

export FLASK_APP=pyfedi.py
flask db upgrade
flask init-db

(choose a new username, email address, and password for your PyFedi admin account)

If you see an error message ModuleNotFoundError: No module named 'flask_babel' then use venv/bin/flask instead of flask for all flask commands.

Run the app

flask run

(open web browser at http://127.0.0.1:5000)
(log in with username and password from admin account)

Database Management

In future if you use git pull and notice some new files in migrations/versions/*, you need to do:

source venv/bin/activate #if not already in virtual environment
flask db upgrade

For Database changes:

create a migration based on recent changes to app/models.py:

flask db migrate -m "users table"

run migrations:

flask db upgrade

Keeping your local instance up to date

In a development environment, all you need to do is

git pull
flask db upgrade

In production, celery and flask run as background services so they need to be restarted manually. Run the ./deploy.sh script to easily restart services at the same time as pulling down changes from git, etc.

Federation during development

Federation doesn't work without SSL, without a domain name or without your server being accessible from outside your network. So, when running on http://127.0.0.1:5000 you have none of those.

The site will still run without federation. You can create local communities and post in them...

My way around this is to use ngrok.com, which is a quick and simple way to create a temporary VPN with a domain and SSL. The free plan comes with ephermeral domain names that change every few days, which will break federation, or one randomly-named static domain that will need re-launching every few days. $10 per month will get you https://yourwhatever.ngrok.app which won't change.

Once you have ngrok working, edit the .env file and change the SERVER_NAME variable to your new domain name.

Running PieFed in production

Copy celery_worker.default.py to celery_worker.py. Edit DATABASE_URL and SERVER_NAME to have the same values as in .env.

Edit gunicorn.conf.py and change worker_tmp_dir if needed.

You will want to tune PostgreSQL. More on this. If you have more than 4 GB of RAM, consider turning on 'huge pages' also see this.

PgBouncer can be helpful in a high traffic situation.

Background services

Gunicorn and Celery need to run as background services:

Gunicorn

Create a new file:

sudo nano /etc/systemd/system/pyfedi.service

Add the following to the new file, altering paths as appropriate for your install location

[Unit]
Description=Gunicorn instance to serve PieFed application
After=network.target

[Service]
User=rimu
Group=rimu
WorkingDirectory=/home/rimu/pyfedi/
Environment="PATH=/home/rimu/pyfedi/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin"
ExecStart=/home/rimu/pyfedi/venv/bin/gunicorn --config gunicorn.conf.py --preload pyfedi:app
ExecReload=/bin/kill -HUP $MAINPID
Restart=always


[Install]
WantedBy=multi-user.target

Celery

Create another file:

sudo nano /etc/systemd/system/celery.service

Add the following, altering as appropriate

[Unit]
Description=Celery Service
After=network.target

[Service]
Type=forking
User=rimu
Group=rimu
EnvironmentFile=/etc/default/celeryd
WorkingDirectory=/home/rimu/pyfedi
ExecStart=/bin/sh -c '${CELERY_BIN} multi start -A ${CELERY_APP} ${CELERYD_NODES} --pidfile=${CELERYD_PID_FILE} \
  --logfile=${CELERYD_LOG_FILE} ${CELERYD_OPTS}'
ExecStop=/bin/sh -c '${CELERY_BIN} multi stopwait ${CELERYD_NODES} --pidfile=${CELERYD_PID_FILE}'
ExecReload=/bin/sh -c '${CELERY_BIN} multi restart -A ${CELERY_APP} ${CELERYD_NODES} --pidfile=${CELERYD_PID_FILE} \
  --logfile=${CELERYD_LOG_FILE} ${CELERYD_OPTS}'

[Install]
WantedBy=multi-user.target

Create another file:

sudo nano /etc/default/celeryd

Contents (change paths to suit):

# The names of the workers. This example creates one workers
CELERYD_NODES="worker1"

# The name of the Celery App, should be the same as the python file
# where the Celery tasks are defined
CELERY_APP="celery_worker.celery"

# Log and PID directories
CELERYD_LOG_FILE="/var/log/celery/%n%I.log"
CELERYD_PID_FILE="/dev/shm/celery/%n.pid"

# Log level
CELERYD_LOG_LEVEL=INFO

# Path to celery binary, that is in your virtual environment
CELERY_BIN=/home/rimu/pyfedi/venv/bin/celery
CELERYD_OPTS="--autoscale=5,1"

Enable and start background services

sudo systemctl enable pyfedi.service
sudo systemctl enable celery.service

sudo systemctl start pyfedi.service
sudo systemctl start celery.service

Check status of services:

sudo systemctl status pyfedi.service
sudo systemctl status celery.service

Inspect log files at:

  • /var/log/celery/*
  • /var/log/nginx/*
  • /your_piefed_installation/logs/pyfedi.log

Nginx

You need a reverse proxy that sends all traffic to port 5000. Something like:

upstream app_server {
    # fail_timeout=0 means we always retry an upstream even if it failed
    # to return a good HTTP response

    # for UNIX domain socket setups
    # server unix:/tmp/gunicorn.sock fail_timeout=0;

    # for a TCP configuration
    server 127.0.0.1:5000 fail_timeout=0;
    keepalive 4;
}

server {
    server_name piefed.social
    root /whatever

    keepalive_timeout 5;
    ssi off;

    location / {
        # Proxy all requests to Gunicorn
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_pass http://app_server;
        ssi off;
    }
}

The above is not a complete configuration - you will want to add more settings for SSL, etc. See also https://codeberg.org/rimu/pyfedi/issues/136#issuecomment-1726739

Cron tasks

To send email reminders about unread notifications, put this in a new file under /etc/cron.d

1 */6 * * * rimu cd /home/rimu/pyfedi && /home/rimu/pyfedi/email_notifs.sh

Change /home/rimu/pyfedi to the location of your installation and change rimu to the user that piefed runs as.

Once a week or so it's good to run remove_orphan_files.sh to save disk space:

5 4 * * 1 rimu cd /home/rimu/pyfedi && /home/rimu/pyfedi/remove_orphan_files.sh

Email

Email can be sent either through SMTP or Amazon web services (SES). SES is faster but PieFed does not send much email so it probably doesn't matter which method you choose.

AWS SES

PieFed uses Amazon's boto3 module to connect to SES. Boto3 needs to log into AWS and that can be set up using a file at ~/.aws/credentials or environment variables. Details at https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html.

In your .env you need to set the AWS region you're using for SES. Something like AWS_REGION = 'ap-southeast-2'.

CDN

A CDN like Cloudflare is recommended for instances with more than a handful of users. Recommended caching settings.

PieFed has the capability to automatically remove file copies from the Cloudflare cache whenever those files are deleted from the server. To enable this, set these variables in your .env file:

SMTP

To use SMTP you need to set all the MAIL_* environment variables in you .env file. See env.sample for a list of them.

Testing email

You need to set MAIL_FROM in .env to some email address.

Log into Piefed then go to https://yourdomain/test_email to trigger a test email. It will use SES or SMTP depending on which environment variables you defined in .env. If MAIL_SERVER is empty it will try SES. Then if AWS_REGION is empty it'll silently do nothing.

Pre-requisites for Mac OS

Install Python Version Manager (pyenv)

see this site: https://opensource.com/article/19/5/python-3-default-mac

brew install pyenv

Install Python3 version and set as default (with pyenv)

pyenv install 3.8.6
pyenv global 3.7.3

Note.. You may see this error when running pip install -r requirements.txt in regards to psycopg2:

ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command 'clang' failed with exit status 1

If this happens try installing openssl... Install openssl with brew install openssl if you don't have it already.

brew install openssl

Add openssl path to LIBRARY_PATH :

export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/

Notes for Windows (WSL 2 - Ubuntu 22.04 LTS - Python 3.9.16)

Important: Python 3.10+ or 3.11+ may cause some package or compatibility errors. If you are having issues installing packages from requirements.txt, try using Python 3.8 or 3.9 instead with pyenv (https://github.com/pyenv/pyenv). Follow all the setup instructions in the pyenv documentation and setup any version of either Python 3.8 or 3.9. If you are getting installation errors or missing packages with pyenv, run

sudo apt-update
sudo apt install build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev curl libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev llvm

Install Python 3, pip, and venv

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install python3 python3-pip ipython3 libpq-dev python3-psycopg2 python3-dev build-essential redis-server
sudo apt-get install python3-venv

Setup venv first before installing other packages

**Note: ** (Replace <3.9> with your version number if you are using another version of Python, e.g. 'sudo apt-get install python3.10-venv' for Python 3.10. Repeat for the rest of the instructions below.)

python3.9 -m venv ./venv
source venv/bin/activate

Make sure that your venv is also running the correct version of pyenv. You may need to re-setup venv if you setup venv before pyenv.

Follow the package installation instructions above to get the packages

python3.9 -m pip install --upgrade pip setuptools wheel
pip install -r requirements.txt

Notes for Pip Package Management:

make sure you have wheel installed:

pip install wheel

install packages from a file:

pip install -r requirements.txt

dump currently installed packages to file:

pip freeze > requirements.txt

upgrade a package:

pip install --upgrade <package_name>