add config validation

defaults/main.yml

@@ -1,6 +1,7 @@
 ---
 nginx_user: nginx
 nginx_group: nginx
+nginx_worker_processes: 1
 nginx_open_ports:
   - 80
   - 443

tasks/install.yml

@@ -57,6 +57,7 @@
       owner: root
       group: root
       mode: 0640
+      validate: /sbin/nginx -t -c %s
     notify:
       - nginx_reload
 
@@ -67,6 +68,7 @@
       owner: root
       group: root
       mode: 0640
+      validate: bash -c 'nginx -t -c /dev/stdin <<< "events {worker_connections 1;} http { include %s; }"'
     with_items:
       - header.conf
       - tls.conf

templates/etc/nginx/nginx.conf.j2

@@ -1,6 +1,6 @@
 # {{ ansible_managed }}
 user {{ nginx_user }} {{ nginx_group }};
-worker_processes 1;
+worker_processes {{ nginx_worker_processes }};
 
 error_log /var/log/nginx/error.log;
 pid /run/nginx.pid;