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+====== NGINX ======
+Setup NGINX as reverse proxy server
+===== Install =====
+Only nginx (or nginx-full) is required. But other tools are likely needed with running NGINX as reverse proxy
+<code bash>
+aptitude install nginx-full apache2-utils certbot python3-certbot-nginx curl ethtool fail2ban git gzip iputils-tracepath nmap openbsd-inetd tcpdump ufw
+</code>
+===== System Config =====
+==== Setting number of open files allowed ====
+Setting NGINX user www-data to have 8192 files open. This should be same (or higher than) ''worker_rlimit_nofile'' setting in NGINX config.\\
+Create and append to file ''/etc/security/limits.d/10-nofile.conf''
+<code>
+www-data soft nofile 8192
+</code>
+=== Related commands ===
+Soft Limit
+<code bash>
+ulimit -S -a
+</code>
+Hard Limit
+<code bash>
+ulimit -H -a
+</code>
+===== NGINX Config =====
+==== SSL ====
+=== Resources ===
+  * [[https://ssl-config.mozilla.org/#server=nginx&version=1.17.7&config=intermediate&openssl=1.1.1k&guideline=5.6|SSL Configuration Generator]]
+  * [[https://medium.com/@mvuksano/how-to-properly-configure-your-nginx-for-tls-564651438fe0|How to properly configure your nginx for TLS]]
+  * [[https://gist.github.com/gavinhungry/7a67174c18085f4a23eb|Nginx SSL/TLS configuration for "A+" Qualys SSL Labs rating]]
+  * Run online test with [[https://www.ssllabs.com/ssltest/|Quarlys SSL Server Test]]
+  * [[https://scaron.info/blog/improve-your-nginx-ssl-configuration.html|Improve your Nginx SSL configuration]]
+  * [[https://blog.qualys.com/product-tech/2017/03/13/caa-mandated-by-cabrowser-forum|CAA Mandated by CA/Browser Forum]]
+Create file ''conf.d/ssl.conf'' with
+<code nginx>
+ssl_prefer_server_ciphers on;
+#ssl_prefer_server_ciphers off;
+ssl_protocols           TLSv1.2 TLSv1.3;
+ssl_ciphers             ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
+# Configure a shared memory cache of 4 MB
+ssl_session_cache       shared:SSL:4m;
+# Expire individual sessions after 2 hours.
+ssl_session_timeout     2h;
+#
+#ssl_certificate         /etc/nginx/ssl/nginx.crt;
+#ssl_certificate_key     /etc/nginx/ssl/nginx.key;
+ssl_dhparam             /etc/nginx/ssl/dhparam.pem;
+#
+# Enable OCSP stapling
+ssl_stapling on;
+ssl_stapling_verify on;
+</code>
+THIS IS NOT REQUIRED! Generate Certificates - Here we are just doing a self-signed cert to get started
+<code bash>
+mkdir /etc/nginx/ssl
+cd /etc/nginx/ssl
+openssl req -x509 -nodes -days 36524 -newkey rsa:2048 -keyout nginx.key -out nginx.crt
+cat nginx.crt nginx.key > nginx.pem
+</code>
+Improve Diffie-Hellman keys
+<code bash>
+openssl dhparam 4096 -out /etc/nginx/ssl/dhparam.pem
+</code>
+===== Harden =====
+Use ufw to restrict connections going out of NGINX server to minimum required.
+<code bash>
+# Reset if needed
+ufw reset
+# Turn on logging
+ufw logging on
+# Allow ALL incoming - Depend on the network to only allow 80, 443.  If network itself is hacked you have bigger problems!
+ufw default allow incoming
+# Deny ALL outgoing - You want to limit outgoing to just what is required
+ufw default deny outgoing
+# Allow server to access DNS servers
+ufw allow out 53
+# Allow server to access Web/Application servers
+ufw allow out to 192.168.1.123 port 8080
+ufw allow out to 192.168.1.234 port 4200
+ufw allow out 80
+ufw allow out 443
+# Allow server to access Mail server
+ufw allow out to 192.168.1.111 port 25
+# Allow Time Sync
+ufw allow out 123
+# Enable and check status
+ufw enable
+ufw status verbose
+# Disable command - in case you need to disable
+# ufw disable
+</code>
+===== Other configuration =====
+==== Syntax highlighting ====
+In order to do syntax highlighting when using ''vim'' while editing NGINX config files, install ''Vim plugin for Nginx''.
+Follow the steps found in: https://github.com/chr4/nginx.vim
+==== Logrotate ====
+Update nginx logrotate ''/etc/logrotate.d/nginx'' to include ''/var/log/nginx/*/*.log'' to existing ''/var/log/nginx/*.log''
+<code>
+/var/log/nginx/*.log
+/var/log/nginx/*/*.log
+{
+    daily
+    ...
+    ...
+}
+</code>
+==== Default ====
+<code nginx>
+server {
+    listen 80 default_server;
+    listen [::]:80 default_server;
+    root /var/www/html;
+    index index.html index.htm index.nginx-debian.html;
+    server_name _;
+    location / {
+        try_files $uri $uri/ =404;
+    }
+server {
+    # SSL configuration
+    #
+    listen 443 ssl default_server;
+    listen [::]:443 ssl default_server;
+    #
+    ssl_certificate     /etc/nginx/ssl/nginx.pem;
+    ssl_certificate_key /etc/nginx/ssl/nginx.key;
+    root /var/www/html;
+    # Add index.php to the list if you are using PHP
+    index index.html index.htm index.nginx-debian.html;
+    server_name _;
+    location / {
+        # First attempt to serve request as file, then
+        # as directory, then fall back to displaying a 404.
+        try_files $uri $uri/ =404;
+    }
+}
+server {
+    # SSL configuration
+    #
+    listen 8443 ssl default_server;
+    listen [::]:8443 ssl default_server;
+    #
+    ssl_certificate     /etc/nginx/ssl/nginx.pem;
+    ssl_certificate_key /etc/nginx/ssl/nginx.key;
+    root /var/www/html;
+    # Add index.php to the list if you are using PHP
+    index index.html index.htm index.nginx-debian.html;
+    server_name _;
+    location / {
+        # First attempt to serve request as file, then
+        # as directory, then fall back to displaying a 404.
+        try_files $uri $uri/ =404;
+    }
+    access_log /var/log/nginx/access_8443.log      apache;
+}
+server {
+    listen 8080 default_server;
+    listen [::]:8080 default_server;
+    root /var/www/html;
+    # Add index.php to the list if you are using PHP
+    index index.html index.htm index.nginx-debian.html;
+    server_name _;
+    location / {
+        # First attempt to serve request as file, then
+        # as directory, then fall back to displaying a 404.
+        try_files $uri $uri/ =404;
+    }
+    access_log /var/log/nginx/access_8080.log      apache;
+}
+</code>
+==== fail2ban ====
+Setup for WordPress filter.
+===== Testing configuration changes =====
+<code bash>
+nginx -t
+</code>
+===== Reload without restarting =====
+<code bash>
+nginx -s reload
+</code>

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