Update docs/OnlineInstallationGuide.md

docs/OnlineInstallationGuide.md

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+# Installation
+
+## NodeJS
+```bash
+# Using Ubuntu
+curl -sL https://deb.nodesource.com/setup_13.x | sudo -E bash -
+sudo apt-get install -y nodejs
+```
+
+## ComunicAPI
+1. Clone the repository
+2. Run `npm install`
+3. Install webpack: `npm install webpack webpack-cli`
+
+4. Build the project
+```bash
+node_modules/.bin/webpack
+```
+
+5. Create custom config: `cp config.json config.private.json` & customize it (do not forget to add the `proxy` and `force_clients_https` attributes if you need them!)
+
+6. Adapt the following command to test the server: `/usr/bin/node /home/comunic/comunicapiv2/build/index.js /home/comunic/comunicapiv2/config.private.json`
+
+7. Create Apache configuration, save it & restart Apache:
+```conf
+<VirtualHost *:443>
+    ServerName api.communiquons.org
+
+    ServerAdmin webmaster@localhost
+
+    ErrorLog ${APACHE_LOG_DIR}/error.log
+    CustomLog ${APACHE_LOG_DIR}/access.log combined
+
+    ProxyPreserveHost On
+    ProxyRequests off
+    AllowEncodedSlashes NoDecode
+    ProxyPass / http://localhost:3005/ nocanon
+    ProxyPassReverse / http://localhost:3005/
+
+    SSLEngine on
+    SSLCertificateFile    /etc/letsencrypt/live/communiquons.org-0001/fullchain.pem
+    SSLCertificateKeyFile  /etc/letsencrypt/live/communiquons.org-0001/privkey.pem
+</VirtualHost>
+```
+
+8. Create systemd configuration (in `/etc/systemd/system/comunic.service`):
+```conf
+[Unit]
+Description=Comunic API Server
+After=syslog.target
+After=network.target
+
+[Service]
+# Modify these two values ​​and uncomment them if you have
+# repos with lots of files and get to HTTP error 500 because of that
+###
+# LimitMEMLOCK=infinity
+# LimitNOFILE=65535
+RestartSec=2s
+Type=simple
+User=comunic
+Group=comunic
+WorkingDirectory=/home/comunic
+ExecStart=/usr/bin/node /home/comunic/comunicapiv2/build/index.js /home/comunic/comunicapiv2/config.private.json
+Restart=always
+Environment=USER=comunic 
+HOME=/home/comunic
+
+[Install]
+WantedBy=multi-user.target
+```
+
+9. Enable new configuration:
+```bash
+sudo systemctl enable comunic.service
+sudo systemctl start comunic.service
+```