Add nginx ansible role blog article

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diff --git a/content/blog/ansible/nginx-ansible-role.md b/content/blog/ansible/nginx-ansible-role.md
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+---
+title: 'Nginx ansible role'
+description: 'The ansible role I use to manage my nginx web servers'
+date: '2024-10-28'
+tags:
+- ansible
+- nginx
+---
+
+## Introduction
+
+Before succumbing to nixos, I had been using an ansible role to manage my nginx web servers. Now that I am in need of it again I refined it a bit: here is the result.
+
+## The role
+
+### Vars
+
+The role has OS specific vars in files named after the operating system. For example in `vars/Debian.yaml` I have:
+
+``` yaml
+---
+nginx:
+  etc_dir: '/etc/nginx'
+  pid_file: '/run/nginx.pid'
+  www_user: 'www-data'
+```
+
+While in `vars/FreeBSD.yaml` I have:
+
+``` yaml
+---
+nginx:
+  etc_dir: '/usr/local/etc/nginx'
+  pid_file: '/var/run/nginx.pid'
+  www_user: 'www'
+```
+
+### Tasks
+
+The main tasks file setups nginx and the global configuration common to all virtual hosts:
+
+``` yaml
+---
+- include_vars: '{{ ansible_distribution }}.yaml'
+
+- name: 'Install nginx'
+  package:
+    name:
+      - 'nginx'
+
+- name: 'Make nginx vhost directory'
+  file:
+    path: '{{ nginx.etc_dir }}/vhost.d'
+    mode: '0755'
+    owner: 'root'
+    state: 'directory'
+
+- name: 'Deploy nginx configuration files'
+  copy:
+    src: '{{ item }}'
+    dest: '{{ nginx.etc_dir }}/{{ item }}'
+  notify: 'reload nginx'
+  loop:
+    - 'headers_base.conf'
+    - 'headers_secure.conf'
+    - 'headers_static.conf'
+    - 'headers_unsafe_inline_csp.conf'
+
+- name: 'Deploy nginx configuration template'
+  template:
+    src: 'nginx.conf'
+    dest: '{{ nginx.etc_dir }}/'
+  notify: 'reload nginx'
+
+- name: 'Deploy nginx certificates'
+  copy:
+    src: '{{ item }}'
+    dest: '{{ nginx.etc_dir }}/'
+  notify: 'reload nginx'
+  loop:
+    - 'adyxax.org.fullchain'
+    - 'adyxax.org.key'
+    - 'dh4096.pem'
+
+- name: 'Start nginx and activate it on boot'
+  service:
+    name: 'nginx'
+    enabled: true
+    state: 'started'
+```
+
+I have a `vhost.yaml` task file which currently simply deploys a file and reload nginx:
+
+``` yaml
+- name: 'Deploy {{ vhost.name }} vhost {{ vhost.path }}'
+  template:
+    src: '{{ vhost.path }}'
+    dest: '{{ nginx.etc_dir }}/vhost.d/{{ vhost.name }}.conf'
+  notify: 'reload nginx'
+```
+
+### Handlers
+
+There is a single `main.yaml` handler:
+
+``` yaml
+---
+- name: 'reload nginx'
+  service:
+    name: 'nginx'
+    state: 'reloaded'
+```
+
+### Files
+
+I deploy four configuration files in this role. These are all variants of the same theme and their purpose is just to prevent duplicating statements in the virtual hosts configuration files.
+
+`headers_base.conf`:
+
+``` nginx
+###############################################################################
+#     \_o<     WARNING : This file is being managed by ansible!      >o_/     #
+#     ~~~~                                                           ~~~~     #
+###############################################################################
+
+add_header X-Frame-Options deny;
+add_header X-XSS-Protection "1; mode=block";
+add_header X-Content-Type-Options nosniff;
+add_header Referrer-Policy strict-origin;
+add_header Cache-Control no-transform;
+add_header Permissions-Policy "accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()";
+# 6 months HSTS pinning
+add_header Strict-Transport-Security max-age=16000000;
+```
+
+`headers_secure.conf`:
+
+``` nginx
+###############################################################################
+#     \_o<     WARNING : This file is being managed by ansible!      >o_/     #
+#     ~~~~                                                           ~~~~     #
+###############################################################################
+
+include headers_base.conf;
+add_header Content-Security-Policy "script-src 'self'";
+```
+
+`headers_static.conf`:
+
+``` nginx
+###############################################################################
+#     \_o<     WARNING : This file is being managed by ansible!      >o_/     #
+#     ~~~~                                                           ~~~~     #
+###############################################################################
+
+include headers_secure.conf;
+# Infinite caching
+add_header Cache-Control "public, max-age=31536000, immutable";
+```
+
+`headers_unsafe_inline_csp.conf`:
+
+``` nginx
+###############################################################################
+#     \_o<     WARNING : This file is being managed by ansible!      >o_/     #
+#     ~~~~                                                           ~~~~     #
+###############################################################################
+
+include headers_base.conf;
+add_header Content-Security-Policy "script-src 'self' 'unsafe-inline'";
+```
+
+### Templates
+
+I have a single template for `nginx.conf`:
+
+``` nginx
+###############################################################################
+#     \_o<     WARNING : This file is being managed by ansible!      >o_/     #
+#     ~~~~                                                           ~~~~     #
+###############################################################################
+
+user {{ nginx.www_user }};
+worker_processes  auto;
+pid {{ nginx.pid_file }};
+error_log /var/log/nginx/error.log;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include              mime.types;
+    types_hash_max_size  4096;
+    sendfile             on;
+    tcp_nopush           on;
+    tcp_nodelay          on;
+    keepalive_timeout    65;
+
+    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;
+    ssl_prefer_server_ciphers on;
+
+    gzip             on;
+    gzip_static      on;
+    gzip_vary        on;
+    gzip_comp_level  5;
+    gzip_min_length  256;
+    gzip_proxied     expired  no-cache  no-store  private  auth;
+    gzip_types  application/atom+xml  application/geo+json  application/javascript  application/json  application/ld+json  application/manifest+json  application/rdf+xml  application/vnd.ms-fontobject  application/wasm  application/x-rss+xml  application/x-web-app-manifest+json  application/xhtml+xml  application/xliff+xml  application/xml  font/collection  font/otf  font/ttf  image/bmp  image/svg+xml  image/vnd.microsoft.icon  text/cache-manifest  text/calendar  text/css  text/csv  text/javascript  text/markdown  text/plain  text/vcard  text/vnd.rim.location.xloc  text/vtt  text/x-component  text/xml;
+
+    proxy_redirect         off;
+    proxy_connect_timeout  60s;
+    proxy_send_timeout     60s;
+    proxy_read_timeout     60s;
+    proxy_http_version     1.1;
+    proxy_set_header       "Connection"        "";
+    proxy_set_header       Host                $host;
+    proxy_set_header       X-Real-IP           $remote_addr;
+    proxy_set_header       X-Forwarded-For     $proxy_add_x_forwarded_for;
+    proxy_set_header       X-Forwarded-Proto   $scheme;
+    proxy_set_header       X-Forwarded-Host    $host;
+    proxy_set_header       X-Forwarded-Server  $host;
+
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+
+    client_max_body_size  40M;
+    server_tokens         off;
+    default_type          application/octet-stream;
+    access_log            /var/log/nginx/access.log;
+
+    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
+    fastcgi_param  QUERY_STRING     $query_string;
+    fastcgi_param  REQUEST_METHOD   $request_method;
+    fastcgi_param  CONTENT_TYPE     $content_type;
+    fastcgi_param  CONTENT_LENGTH   $content_length;
+
+    fastcgi_param  SCRIPT_NAME      $fastcgi_script_name;
+    fastcgi_param  REQUEST_URI      $request_uri;
+    fastcgi_param  DOCUMENT_URI     $document_uri;
+    fastcgi_param  DOCUMENT_ROOT    $document_root;
+    fastcgi_param  SERVER_PROTOCOL  $server_protocol;
+    fastcgi_param  REQUEST_SCHEME   $scheme;
+    fastcgi_param  HTTPS            $https                 if_not_empty;
+
+    fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
+    fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;
+
+    fastcgi_param  REMOTE_ADDR  $remote_addr;
+    fastcgi_param  REMOTE_PORT  $remote_port;
+    fastcgi_param  REMOTE_USER  $remote_user;
+    fastcgi_param  SERVER_ADDR  $server_addr;
+    fastcgi_param  SERVER_PORT  $server_port;
+    fastcgi_param  SERVER_NAME  $server_name;
+
+    # PHP only, required if PHP was built with --enable-force-cgi-redirect
+    fastcgi_param  REDIRECT_STATUS  200;
+
+    uwsgi_param  QUERY_STRING    $query_string;
+    uwsgi_param  REQUEST_METHOD  $request_method;
+    uwsgi_param  CONTENT_TYPE    $content_type;
+    uwsgi_param  CONTENT_LENGTH  $content_length;
+
+    uwsgi_param  REQUEST_URI      $request_uri;
+    uwsgi_param  PATH_INFO        $document_uri;
+    uwsgi_param  DOCUMENT_ROOT    $document_root;
+    uwsgi_param  SERVER_PROTOCOL  $server_protocol;
+    uwsgi_param  REQUEST_SCHEME   $scheme;
+    uwsgi_param  HTTPS            $https             if_not_empty;
+
+    uwsgi_param  REMOTE_ADDR  $remote_addr;
+    uwsgi_param  REMOTE_PORT  $remote_port;
+    uwsgi_param  SERVER_PORT  $server_port;
+    uwsgi_param  SERVER_NAME  $server_name;
+
+    ssl_dhparam          dh4096.pem;
+    ssl_session_cache    shared:SSL:2m;
+    ssl_session_timeout  1h;
+    ssl_session_tickets  off;
+
+    server {
+        listen                   80       default_server;
+        listen                   [::]:80  default_server;
+        server_name              _;
+        access_log               off;
+        server_name_in_redirect  off;
+        return                   444;
+    }
+
+    server {
+        listen                   443       ssl;
+        listen                   [::]:443  ssl;
+        server_name              _;
+        access_log               off;
+        server_name_in_redirect  off;
+        return                   444;
+        ssl_certificate      adyxax.org.fullchain;
+        ssl_certificate_key  adyxax.org.key;
+    }
+
+    include vhost.d/*.conf;
+}
+```
+
+## Usage example
+
+I do not call the role from a playbook, I prefer running the setup from an application's role that relies on nginx using a `meta/main.yaml` containing something like:
+
+``` yaml
+---
+dependencies:
+  - role: 'borg'
+  - role: 'nginx'
+  - role: 'postgresql'
+```
+
+Then from a tasks file:
+
+``` yaml
+- include_role:
+    name: 'nginx'
+    tasks_from: 'vhost'
+  vars:
+    vhost:
+      name: 'www'
+      path: 'roles/www.adyxax.org/files/nginx-vhost.conf'
+```
+
+I did not find an elegant way to pass a file path local to one role to another. Because of that, here I just specify the full vhost file path complete with the `roles/` prefix.
+
+### Conclusion
+
+I you have an elegant idea for passing the local file path from one role to another do not hesitate to ping me!
diff --git a/content/blog/ansible/postgresql-ansible-role.md b/content/blog/ansible/postgresql-ansible-role.md
index 848e206..02614c0 100644
--- a/content/blog/ansible/postgresql-ansible-role.md
+++ b/content/blog/ansible/postgresql-ansible-role.md
@@ -224,7 +224,7 @@ I do not call the role from a playbook, I prefer running the setup from an appli
 ``` yaml
 ---
 dependencies:
-  - role: 'borg
+  - role: 'borg'
   - role: 'postgresql'
 ```