Installation Guide

This document explains how to deploy a single node instance of the data registry, suitable for testing or a proof-of-concept.

Setting up the database

Firstly, connect to the database using psql:

$ sudo -u postgres psql
psql (10.12 (Ubuntu 10.12-0ubuntu0.18.04.1))
Type "help" for help.
postgres=#

Create a database:

postgres=# CREATE DATABASE scrc;
CREATE DATABASE

Create a user (replacing password with the password for your user):

postgres=# CREATE USER scrc WITH PASSWORD 'password';
CREATE ROLE

Give the user the required permissions and exit:

postgres=# ALTER ROLE scrc SET client_encoding TO 'utf8';
ALTER ROLE
postgres=# ALTER ROLE scrc SET default_transaction_isolation TO 'read committed';
ALTER ROLE
postgres=# ALTER ROLE scrc SET timezone TO 'UTC';
ALTER ROLE
postgres=# GRANT ALL PRIVILEGES ON DATABASE scrc TO scrc;
GRANT
postgres=# \q

Save the user password in a .pgpass file in the server user home. This should look something like (with password replaced by the database user password used above):

*:*:scrc:scrc:password

The .pgpass file must be only user-readable. The permissions on the file can be set by:

chmod 0600 ~/.pgpass

Installing the server

To install the server you will need Python3 with the virtual environment python package.

git checkout [email protected]:ScottishCovidResponse/data-registry.git
cd data-registry
python -m virtualenv venv
. venv/bin/activate
pip3 install -r requirements.txt

Update the ALLOWED_HOSTS parameter in the settings file drams/settings.py as necessary. This should contain localhost in addition to the external DNS name of the host, e.g.

ALLOWED_HOSTS = ['localhost', 'data.scrc.uk']

Setting up the server:

cd data-registry
. venv/bin/activate
python3 manage.py makemigrations custom_user
python3 manage.py makemigrations data_management
python3 manage.py migrate

Now create a superuser:

python3 manage.py createsuperuser --username admin

The data schema diagrams can be generated using:

python3 manage.py graph_models data_management --arrow-shape crow -X "BaseModel,DataObject,DataObjectVersion" -E -o schema.dot
dot schema.dot -Tsvg -o static/images/schema.svg
dot schema.dot -Tpng -o static/images/schema.png

Running the server with gunicorn and nginx

Setting up the gunicorn service

As root, create the file /etc/systemd/system/gunicorn.socket containing:

[Unit]
Description=gunicorn socket

[Socket]
ListenStream=/run/gunicorn.sock

[Install]
WantedBy=sockets.target

and create the file /etc/systemd/system/gunicorn.service containing:

[Unit]
Description=gunicorn daemon
Requires=gunicorn.socket
After=network.target

[Service]
User=ubuntu
Group=ubuntu
WorkingDirectory=/home/ubuntu/scrc
ExecStart=/home/ubuntu/scrc/dataregistry_env/bin/gunicorn \
          --access-logfile - \
          --workers 3 \
          --bind unix:/run/gunicorn.sock \
          dataregistry.wsgi:application

[Install]
WantedBy=multi-user.target

As root, start the gunicorn socket service. The gunicorn service will automatically be started as necessary.

systemctl start gunicorn.socket
systemctl enable gunicorn.socket

Setting up nginx

Create a server block for your domain in /etc/nginx/sites-available, for example /etc/nginx/sites-available/test.scrc.uk.

Example contents:

server {
    server_name data.scrc.uk;

    listen 80 default_server;
    listen [::]:80 default_server;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/ubuntu/data-registry;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

Create a symbolic link to enable this site in nginx:

ln -s /etc/nginx/sites-available/data.scrc.uk /etc/nginx/sites-enabled/

and start nginx:

systemctl start nginx

Obtain a certificate from Let's Encrypt, e.g.

certbot --nginx -d test.scrc.uk

where the DNS name will have to be adjusted as appropriate. This will update the nginx site config file so it should now look something like:

server {
    server_name data.scrc.uk; # managed by Certbot

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/ubuntu/data-registry;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/data.scrc.uk/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/data.scrc.uk/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server {
    if ($host = data.scrc.uk) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    server_name data.scrc.uk;

    listen 80 ;
    listen [::]:80 ;
    return 404; # managed by Certbot
}