This is a nginx module to use Groonga via HTTP.

This was formerly distributed with Groonga and provided as groonga-httpd with bundled nginx.

Debian GNU/Linux bookworm or later:

$ sudo apt install -y -V ca-certificates lsb-release wget
$ wget https://apache.jfrog.io/artifactory/arrow/$(lsb_release --id --short | tr 'A-Z' 'a-z')/apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
$ sudo apt install -y -V ./apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
$ rm -f apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
$ wget https://packages.groonga.org/debian/groonga-apt-source-latest-$(lsb_release --codename --short).deb
$ sudo apt install -y -V ./groonga-apt-source-latest-$(lsb_release --codename --short).deb
$ rm -f groonga-apt-source-latest-$(lsb_release --codename --short).deb
$ sudo apt update
$ sudo apt install -y -V libnginx-mod-http-groonga
$ sudo cp /etc/nginx/groonga.conf /etc/nginx/conf.d/
$ sudo editor /etc/nginx/conf.d/groonga.conf
$ sudo systemctl restart nginx

Ubuntu 23.10 or later:

$ sudo apt -y -V install software-properties-common
$ sudo add-apt-repository -y universe
$ sudo add-apt-repository -y ppa:groonga/ppa
$ sudo apt install -y -V libnginx-mod-http-groonga
$ sudo cp /etc/nginx/groonga.conf /etc/nginx/conf.d/
$ sudo editor /etc/nginx/conf.d/groonga.conf
$ sudo systemctl restart nginx

You need to configure your /etc/nginx/conf.d/groonga.conf to use this module.

Syntax: groonga on | off;

Default: groonga off

Context: location

Specifies whether Groonga is enabled in the location block. The default is off. You need to specify on to enable groonga.

Examples:

location /d/ {
  groonga on;  # Enables groonga under /d/... path
}

location /d/ {
  groonga off; # Disables groonga under /d/... path
}

Syntax: groonga_database /path/to/groonga/database;

Default: None

Context: main, http, server, location

Specifies the path to a Groonga database. This is the required directive.

Syntax: groonga_database_auto_create on | off;

Default: groonga_database_auto_create on;

Context: main, http, server, location

Specifies whether Groonga database is created automatically or not. If the value is on and the Groonga database specified by groonga-httpd-groonga-database doesn't exist, the Groonga database is created automatically. If the Groonga database exists, this module does nothing.

If parent directory doesn't exist, parent directory is also created recursively.

The default value is on. Normally, the value doesn't need to be changed.

Syntax: groonga_base_path /d/;

Default: The same value as location name.

Context: location

Specifies the base path in URI. Groonga uses /d/command?parameter1=value1&... path to run command. The form of path in used in groonga-nginx but groonga-nginx also supports /other-prefix/command?parameter1=value1&... form. To support the form, groonga-nginx removes the base path from the head of request URI and prepend /d/ to the processed request URI. By the path conversion, users can use custom path prefix and Groonga can always uses /d/command?parameter1=value1&... form.

Nomally, this directive isn't needed. It is needed for per command configuration.

Here is an example configuration to add authorization to shutdown command:

groonga_database /var/lib/groonga/db/db;

location /d/shutdown {
  groonga on;
  # groonga_base_path is needed.
  # Because /d/shutdown is handled as the base path.
  # Without this configuration, /d/shutdown/shutdown path is required
  # to run shutdown command.
  groonga_base_path /d/;
  auth_basic           "manager is required!";
  auth_basic_user_file "/etc/managers.htpasswd";
}

location /d/ {
  groonga on;
  # groonga_base_path doesn't needed.
  # Because location name is the base path.
}

Syntax: groonga_log_path path | off;

Default:

• groonga_log_path /var/log/nginx/groonga.log; for deb packages.
• groonga_log_path logs/groonga.log; for source build.

Context: main, http, server, location

Specifies Groonga log path in the main, http, server or location block. The default is /var/log/nginx/groonga.log for deb packages. You can disable logging by specifing off.

Examples:

location /d/ {
  groonga on;
  # You can disable log for groonga.
  groonga_log_path off;
}

Syntax: groonga_log_level none | emergency | alert | ciritical | error | warning | notice | info | debug | dump;

Default: notice

Context: main, http, server, ``location`

Specifies Groonga log level in the main, http, server or location block. The default is notice. You can disable logging by specifying none as log level.

Examples:

location /d/ {
  groonga on;
  # You can customize log level for groonga.
  groonga_log_level notice;
}

Syntax: groonga_query_log_path path | off;

Default:

• groonga_query_log_path /var/log/nginx/groonga-query.log; for deb packages.
• groonga_query_log_path logs/groonga-query.log; for source build.

Context: main, http, server, location

Specifies Groonga's query log path in the main, http, server or location block. The default is /var/log/nginx/groonga-query.log for deb packages and logs/groonga-query.log for source build. You can disable logging to specify off.

Examples:

location /d/ {
  groonga on;
  # You can disable query log for groonga.
  groonga_query_log_path off;
}

Query log is useful for the following cases:

• Detecting slow query.
• Debugging.

You can analyze your query log by groonga-query-log package. The package provides useful tools.

For example, there is a tool that analyzing your query log. It can detect slow queries from your query log. There is a tool that replaying same queries in your query log. It can test the new Groonga before updating production environment.

The following directives are related to the performance of groonga-nginx.

For optimum performance, set this to be equal to the number of CPUs or cores. In many cases, Groonga queries may be CPU-intensive work, so to fully utilize multi-CPU/core systems, it's essential to set this accordingly.

This isn't a groonga-nginx specific directive, but an nginx's one. For details, see https://nginx.org/en/docs/ngx_core_module.html#worker_processes .

By default, this is set to 1. It is nginx's default.

Syntax: groonga_cache_limit limit;

Default: groonga_cache_limit 100;

Context: main, http, server, location

Specifies Groonga's limit of query cache in the main, http, server or location block. The default value is 100. You can disable query cache to specify 0 to groonga_cache_limit explicitly.

Examples:

location /d/ {
  groonga on;
  # You can customize query cache limit for groonga.
  groonga_cache_limit 100;
}

Syntax: groonga_cache_base_path path | off;

Default: groonga_cache_base_path off;

Context: main, http, server, location

Specifies the base path of query cache in the main, http, server or location block.

It's recommended that you specify this configuration when you use multi-workers configuration.

If the base path is specified, you can use persistent cache instead of on memory cache. If you use persistent cache, workers share query cache. It's efficient for multi-workers configuration because the same response is cached only once in multiple workers.

There is one more merit for persistent cache. You don't need to warm up cache after groonga-httpd is restarted. Persistent cache isn't cleared when groonga-httpd is down. groonga-httpd can use existing persistent cache again.

The default value is off. It means that persistent cache is disabled. On memory cache is used. On memory cache is independent in each worker. It's not efficient for multi-workers configuration because two or more workers may keeps the same response separately.

Persistent cache is a bit slower than on memory cache. Normally, the difference has little influence on performance.

You must specify the base path on memory file system. If you specify the base path on disk, your cache will be slow. It's not make sense.

Examples:

location /d/ {
  groonga on;
  # You can customize query cache limit for groonga.
  groonga_cache_base_path /dev/shm/groonga-httpd-cache;
}

LGPLv2.1 only.

See COPYING for details.