split php upstream settings into its own configuration file and assign to $upstream variable

README.md

@@ -13,6 +13,26 @@ Looking for a modern hosting environment provisioned using Ansible? Check out [W
 
 ## Usage
 
+### PHP configuration
+
+The php-fpm pool configuration is located in `global/php-pool.conf` and defaults to PHP 7.1.  It will need modified if you want the default php-fpm pool service to be a different PHP version.  Additional PHP version upstream definitions can be added to the `/upstreams` folder (a PHP 7.0 sample is provided there).  You can either use the default pool using `$upstream` in your nginx configurations or the specific upstream definition (i.e. php71, php70) setup by your custom upstream definitions.
+
+For example, currently the nginx configuration for `singlesite.com` has the following set for php requests:
+
+```
+fastcgi_pass    $upstream
+```
+
+You could change that to the following to use the php 7.0 php service instead (assuming that php7.0-fpm service is running).
+
+```
+fastcgi_pass    php70
+```
+
+This effectively allows you to have different server blocks execute different versions of PHP if needed.
+
+### Site configuration
+
 You can use these sample configurations as reference or directly by replacing your existing nginx directory. Follow the steps below to replace your existing nginx configuration.
 
 Backup any existing config:

global/php-pool.conf

@@ -0,0 +1,12 @@
+# Upstream to abstract backend connection(s) for PHP.
+# Additional upstreams can be added to /etc/nginx/upstreams/*.conf and then you just
+# change `default php71` to whatever the new upstream is (could be php70 for example).
+upstream php71 {
+    server unix:/run/php/php7.1-fpm.sock;
+}
+
+include /etc/nginx/upstreams/*.conf;
+
+map '' $upstream {
+    default php71;
+}

nginx.conf

@@ -33,7 +33,7 @@ http {
 	include global/limits.conf;
 
     # Some WP plugins that push large amounts of data via cookies
-    # can cause 500 HTTP erros if these values aren't increased.
+    # can cause 500 HTTP errors if these values aren't increased.
     fastcgi_buffers 16 16k;
     fastcgi_buffer_size 32k;
 
@@ -44,6 +44,9 @@ http {
 	# Gzip
 	include global/gzip.conf;
 
+	# exposes configured php pool on $upstream variable
+	include global/php-pool.conf;
+
 	# Modules
 	include /etc/nginx/conf.d/*.conf;
 

sites-available/fastcgi-cache.com

@@ -35,10 +35,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-		fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-		#fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-		#fastcgi_pass unix:/var/run/php5-fpm.sock;
+		# Use the php pool defined in the upstream variable.
+		# See global/php-pool.conf for definition.
+        fastcgi_pass   $upstream;
 
 		# Skip cache based on rules in global/server/fastcgi-cache.conf.
 		fastcgi_cache_bypass $skip_cache;

sites-available/multisite-subdirectory.com

@@ -30,10 +30,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-        fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-        #fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-        #fastcgi_pass unix:/var/run/php5-fpm.sock;
+		# Use the php pool defined in the upstream variable.
+        # See global/php-pool.conf for definition.
+        fastcgi_pass   $upstream;
 	}
 
     # Rewrite robots.txt

sites-available/multisite-subdomain.com

@@ -27,10 +27,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-        fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-        #fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-        #fastcgi_pass unix:/var/run/php5-fpm.sock;
+		# Use the php pool defined in the upstream variable.
+        # See global/php-pool.conf for definition.
+        fastcgi_pass   $upstream;
 	}
 
     # Rewrite robots.txt

sites-available/singlesite.com

@@ -27,10 +27,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-        fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-        #fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-        #fastcgi_pass unix:/var/run/php5-fpm.sock;
+		# Use the php pool defined in the upstream variable.
+        # See global/php-pool.conf for definition.
+        fastcgi_pass   $upstream;
 	}
 
     # Rewrite robots.txt

sites-available/ssl-fastcgi-cache.com

@@ -42,10 +42,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-        fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-        #fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-        #fastcgi_pass unix:/var/run/php5-fpm.sock;
+        # Use the php pool defined in the upstream variable.
+        # See global/php-pool.conf for definition.
+        fastcgi_pass   $upstream;
 
 		# Skip cache based on rules in global/server/fastcgi-cache.conf.
 		fastcgi_cache_bypass $skip_cache;

sites-available/ssl.com

@@ -34,10 +34,9 @@ server {
 		try_files $uri =404;
 		include global/fastcgi-params.conf;
 
-		# Change socket if using PHP pools or different PHP version
-        fastcgi_pass unix:/run/php/php7.1-fpm.sock;
-        #fastcgi_pass unix:/run/php/php7.0-fpm.sock;
-        #fastcgi_pass unix:/var/run/php5-fpm.sock;
+		# Use the php pool defined in the upstream variable.
+		# See global/php-pool.conf for definition.
+		fastcgi_pass   $upstream;
 	}
 
 	# Rewrite robots.txt

upstreams/php70.conf

@@ -0,0 +1,4 @@
+# Defines the upstream for PHP 7.0
+upstream php70 {
+    server unix:/run/php/php7.0-fpm.sock;
+}