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Accepted
Putnik
Asked: 2017-05-31 14:15:54 +0800 CST

Nginx: could not build map_hash, you should increase map_hash_bucket_size: 64

  • 772

I need to use redirect map with quite a lot rules (2k+ lines, file size is ~200K)

I have the following settings in nginx:

map $uri $new_uri {
        include /etc/nginx/conf.d/redirects.map;
}

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        # redirects
        if ($new_uri) {
                rewrite ^ $new_uri permanent;
        }

as described here and found here. The problem : configtest fails:

nginx: [emerg] could not build map_hash, you should increase map_hash_bucket_size: 64

I tried to increase map_hash_max_size and map_hash_bucket_size to quite crazy values:

map $uri $new_uri {
        map_hash_max_size 262144;
        map_hash_bucket_size 262144;
        include /etc/nginx/conf.d/redirects.map;
}

but still have the same error (ending exactly with '64'). I selected those values so they are bigger than the file size. I made sure I'm editing live config by adding "blabla" and see 'unknown directive'

So, how those values should be set? There's not much details in the official doc, unfortunately.

nginx

3 Answers

  1. Best Answer

    map_hash_max_size and map_hash_bucket_size must be in http context, i.e. outside of map directive.

    map_hash_max_size 262144;
map_hash_bucket_size 262144;
map $uri $new_uri {
    include /etc/nginx/conf.d/redirects.map;
}
    • 17

  2. I put it on the top of the http {} and it worked. Don't put it outside http {}

    • 2

  3. Add to the top of the http block in the main configuration file (/etc/nginx/nginx.conf):

    map_hash_bucket_size 128;
    • 0