Install pgAdmin 4 in Server Mode

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apt install libgmp3-dev libpq-dev libapache2-mod-wsgi-py3
mkdir ~/environments
apt install python3-venv
python3 -m venv ~/environments/pgadmin4
source ~/environments/pgadmin4/bin/activate
run as administrator
1. Press ⊞ + R
2. Type in cmd
3. Press Ctrl + Shift + Enter
4. Choose Yes and Press Enter
D:
python -m pip install virtualenv
python -m venv D:\var\lib\venv\pgadmin4
D:\var\lib\venv\pgadmin4\Scripts\activate

Wheel

python -m pip install -U pip
python -m pip install  wheel
python -m pip install https://ftp.postgresql.org/pub/pgadmin/pgadmin4/v5.4/pip/pgadmin4-5.4-py3-none-any.whl
python -m pip install https://ftp.postgresql.org/pub/pgadmin/pgadmin4/v4.29/pip/pgadmin4-4.29-py3-none-any.whl

Config

mkdir /var/log/pgadmin4
mkdir -p /var/lib/pgadmin4/{sessions,storage}

chown -R pi:pi /var/lib/pgadmin4
chown -R pi:pi /var/log/pgadmin4
cat <<EOF >> ~/environments/pgadmin4/lib/python3.7/site-packages/pgadmin4/config_local.py
LOG_FILE = '/var/log/pgadmin4/pgadmin4.log'
SQLITE_PATH = '/var/lib/pgadmin4/pgadmin4.db'
SESSION_DB_PATH = '/var/lib/pgadmin4/sessions'
STORAGE_DIR = '/var/lib/pgadmin4/storage'
UPGRADE_CHECK_ENABLED = False
SERVER_MODE = True
EOF
cat <<EOF >> /d/var/lib/venv/pgadmin4/Lib/site-packages/pgadmin4/config_local.py
LOG_FILE = 'D:/var/log/pgadmin4/pgadmin4.log'
SQLITE_PATH = 'D:/var/lib/pgadmin4/pgadmin4.db'
SESSION_DB_PATH = 'D:/var/lib/pgadmin4/sessions'
STORAGE_DIR = 'D:/var/lib/pgadmin4/storage'
UPGRADE_CHECK_ENABLED = False
SERVER_MODE = True
EOF

Setup

python ~/environments/pgadmin4/lib/python3.7/site-packages/pgadmin4/setup.py
: <<'END_COMMENT'
NOTE: Configuring authentication for SERVER mode.

Enter the email address and password to use for the initial pgAdmin user account:

Email address: [email protected]
Password: 
Retype password:
pgAdmin 4 - Application Initialisation
======================================
END_COMMENT
deactivate
(pgadmin4) D:\>python D:\var\lib\venv\pgadmin4\Lib\site-packages\pgadmin4\setup.py
(pgadmin4) D:\>set MOD_WSGI_APACHE_ROOTDIR=C:/xampp/apache

(pgadmin4) D:\>pip install mod-wsgi
(pgadmin4) D:\>mod_wsgi-express module-config
deactivate

Apache2

chown -R www-data:www-data /var/lib/pgadmin4
chown -R www-data:www-data /var/log/pgadmin4
nano /etc/apache2/sites-enabled/000-default.conf
<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    ServerName pi4.dev.shahed.biz

    ServerAdmin [email protected]
    DocumentRoot /var/www/html

    WSGIDaemonProcess pgadmin processes=1 threads=25 python-home=/home/pi/environments/pgadmin4
    WSGIScriptAlias /pgadmin4 "/home/pi/environments/pgadmin4/lib/python3.7/site-packages/pgadmin4/pgAdmin4.wsgi"
    <Directory "/home/pi/environments/pgadmin4/lib/python3.7/site-packages/pgadmin4/">
        WSGIProcessGroup pgadmin
        WSGIApplicationGroup %{GLOBAL}
        Require all granted
    </Directory>

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>
apache2ctl -t
systemctl status apache2
systemctl restart apache2
WSGIDaemonProcess pgadmin processes=1 threads=25 python-home=D:/var/lib/venv/pgadmin4
WSGIScriptAlias /pgadmin4 "D:/var/lib/venv/pgadmin4/Lib/site-packages/pgadmin4/pgAdmin4.wsgi"
<Directory "D:/var/lib/venv/pgadmin4/Lib/site-packages/pgadmin4/">
    WSGIProcessGroup pgadmin
    WSGIApplicationGroup %{GLOBAL}
    Require all granted
</Directory>

Knowledge

cd /usr/share/apache2/icons/
unzip /home/pi/icons.zip
python -m pip install --upgrade pip
python -m pip install -U pip

References