fine-tune logging parameters

Author: pothi

conf.d/common.conf

@@ -27,3 +27,12 @@ server_names_hash_bucket_size 64;
 map $scheme $wpsc_https { default ''; https '-https'; }
 
 # -------------------------------------------------------------------
+
+### Fine-tune logging
+# ref: https://nginx.org/r/access_log
+map $status $loggable {
+    ~^[23]  0;
+    default 1;
+}
+
+# -------------------------------------------------------------------

sites-available/admin-over-ssl.conf

@@ -46,7 +46,7 @@ server {
     ssl_certificate_key /path/to/server.key;
 
     # Logs
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     # Process requests to wp-admin/* and wp-login.php

sites-available/domainname.com.conf

@@ -17,7 +17,7 @@ server {
     root /home/username/sites/domainname.com/wordpress;
 
     # Logs - do check these, if sth goes wrong
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     # Optional configurations

sites-available/ip.conf

@@ -5,7 +5,7 @@ server {
 
     root /home/username/others;
 
-    access_log /var/log/nginx/ip-access.log;
+    access_log /var/log/nginx/ip-access.log combined buffer=64k flush=5m if=$loggable;
     error_log  /var/log/nginx/ip-error.log;
 
     location ~* \.php$ {

sites-available/login-over-ssl.conf

@@ -42,7 +42,7 @@ server {
     ssl_certificate /path/to/combined.crt;
     ssl_certificate_key /path/to/server.key;
 
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     location ~ /wp-login\.php$ {

sites-available/mu-dir-dir-domainname.com.conf

@@ -26,7 +26,7 @@ server {
     root /home/username/sites/domainname.com;
 
     # Logs
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     ### modified version of globals/mu-files.conf;

sites-available/mu-dir-domainname.com.conf

@@ -17,7 +17,7 @@ server {
     index index.php;
 
     # logs
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     include "globals/mu-files.conf";

sites-available/mu-dom-domainname.com.conf

@@ -17,7 +17,7 @@ server {
     index index.php;
 
     # logs
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/domainname.com-error.log;
 
     include "globals/mu-files.conf";

sites-available/multiple-vhosts.conf

@@ -17,7 +17,7 @@ server {
 
 	# Let's have a common log for all the sites
 	# individual logs are not possible to create for each site
-    access_log /var/log/nginx/common-vhost-access.log;
+    access_log /var/log/nginx/common-vhost-access.log combined buffer=64k flush=5m if=$loggable;
     error_log /var/log/nginx/common-vhost-error.log error;
 
     include "globals/restrictions.conf";

sites-available/nginx-varnish-apache.conf

@@ -13,7 +13,7 @@ server {
     root /home/username/sites/domainname.com/wordpress;
 
     error_log /var/log/nginx/domainname.com-error.log;
-    access_log /var/log/nginx/domainname.com-access.log;
+    access_log /var/log/nginx/domainname.com-access.log combined buffer=64k flush=5m if=$loggable;
 
     location ~* \.(?:css|js|ico|svg)$ {
         add_header Cache-Control max-age=2678400;