Nginx位置或地图禁用特定GET参数的访问日志

Question

I've been trying to filter out a bunch of lines from the nginx access log. These lines contain a specific parameter, so I thought it would be easy to filter them out. Examples of the requests:

/index.php?cmd=thumb&#####
/index.php?cmd=preview&#####

where ##### can be anything. /index.php without this 'cmd' parameter (but possibly with other parameters) SHOULD be logged however.

I have tried the following

server {
    location ~ /index\.php\?cmd.* {
        access_log off;
    }
}

My guess is that location only looks at the file on the server you need, not any of the reuqest parameters. That could, for example, explain why location ~* \\.(?:css|js)$ {access_log off;} (notice the $ ) also blocks logging request like /something.js?v=blahblah . As such, my first option would be invalid for sure. This is confirmed below (with source ).

or

server {
    location /index.php {
        if ($arg_cmd) {
            access_log off;
        }
    }
}

or

http {
    map $request_uri $log {
        ~ /index\.php\?cmd.* 0;
        default 1;
    }

    access_log /var/log/nginx/access.log combined if=$log;
}

So far, all of the above do not have the desired result. I'm still convinced this should be possible and that I did something wrong in all of these implementations. Could someone please help me out?

Answer 1

1. First option was never going to work (see directly below it).
2. Second option will only work if the value of the argument evaluates to TRUE. I had no control over the value itself (it was a hash) in my case, so this could not work for me. In my case, another option would be if ($args ~ ^cmd=.+) {access_log off;} if cmd is always the first argument, or just if ($args ~ cmd) {access_log off;} . (thx Richard Smith)
3. I found out that the third option WILL work by removing the space between ~ and /index\\.php\\?cmd.* 0; This one allows me to globally set some more conditions to ignore, so I'm sticking with this one.