nginx问题之nginx: could not build server_names_hash, you should increase server_names_hash_bucket_size解决方案

昨天在nginx上部署了一个网站后，发现访问不了，再去访问之前部署的网站，发现都访问不了了，去看下下nginx,发现nginx服务停止了，没有在运行，重启了下服务，发现还是一样，就去看了下nginx的日志，发下下面这样的提示：



看到什么server_names_hash_bucket_size之类的，我猜测是部署网站的时候，起的主机名称太长了，改小后果然，重启nginx,马上就好了。

解决方案：

edit the http{} nginx configuration：

http {
server_names_hash_bucket_size 64;
...
}

The default value of

server_names_hash_bucket_size

depends on the size of the processor’s cache line

If a large number of server names are defined, or unusually long server names are defined, tuning the server_names_hash_max_size and server_names_hash_bucket_size directives at the http level may become necessary.

If the default value of server_names_hash_bucket_size used at the server is not enough, means nginx complained with

could not build the server_names_hash, you should increase server_names_hash_bucket_size: 32

, the directive value should be increased to the next power of two (e.g. in this case to 64).

If a large number of server names are defined, and nginx complained with the following error

could not build the server_names_hash, you should increase either server_names_hash_max_size: 512 or server_names_hash_bucket_size: 32

. try to set server_names_hash_max_size to a number close to the number of server names. Only if this does not help, or if nginx’s start time is unacceptably long, try to increase server_names_hash_bucket_size.

The hash bucket size parameter is aligned to the size that is a multiple of the processor’s cache line size