November 14, 2008 by CharlyBr | http in nginx

Fix nginx increase server_names_hash_bucket_size error

When adding new virtual hosts in your nginx configuration file, you can experience this error message:

# nginx -t
2008/11/13 09:37:03 [emerg] 12299#0: could not build the server_names_hash, you should increase server_names_hash_bucket_size: 32
2008/11/13 09:37:03 [emerg] 12299#0: the configuration file /etc/nginx/nginx.conf test failed

server_names_hash_bucket_size controls the maximum length of a virtual host entry (ie the length of the domain name).

In other words, if your domain names are long, increase this parameter.

You need to add this flag in the http context:

http {
    server_names_hash_bucket_size 64;
    ...
}

After increasing the value, test your configuration file and reload nginx:

# nginx -t
2008/11/13 09:48:06 [info] 12315#0: the configuration file /etc/nginx/nginx.conf syntax is ok
2008/11/13 09:48:06 [info] 12315#0: the configuration file /etc/nginx/nginx.conf was tested successfully
# kill -HUP `cat /var/run/nginx.pid`

Mihnea Simian

That’s true, I do have a long virtual host (24 chars).
Thanks, it worked!
Paul Klinkenberg

Hey, thanks a lot for posting!
Robert Reiz

Thanks. That worked for me, too.
I just don’t understand why we default value is so low the many people are running in this issue.
Doug

Thanks so much for posting this, worked like a charm!
Chet King

Fixed a problem I was stumped on for over a week. Thanks so much!
NSpirit

Thanks a lot, it worked 🙂
Lau

Thanks a lot
Pingback: increase server_names_hash_bucket_size()
Josvic Zammit

Thanks! Worked beautifully!
Bumida

It should specify in the very first line. Thanks for Info,
DaveQB

Thanks!
Odd that the default is so small.

I guess that’s nginx being lean as always.
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Dan Smart

Thanks, much appreciated.
cool

Thanks
bernard robert

Hi
Where can I find the http?
bernard robert

I can’t allocate the folder .
Charles

you can find it in the nginx configuration file!
bernard robert

I tried to fix but still doesnt but still doesnt work
Daniel Sam

thank you for the informations
Raaz kumar

its worked
Marcos Viviane

Ok, thx

MrBrown blob

random bits.

Fix nginx increase server_names_hash_bucket_size error