Media Wiki CirrusSearch
External
- https://www.mediawiki.org/wiki/Extension:CirrusSearch
- https://www.mediawiki.org/wiki/Help:CirrusSearch
Internal
Installation
Install elasticsearch. Use the latest recommended major version elasticsearch. Do not use 7.x if they recommend 6.x.
Install Elastica extension:
Download the correct CirrusSearch version from https://www.mediawiki.org/wiki/Special:ExtensionDistributor/CirrusSearch
Unzip it in the extensions directory:
tar -xzf CirrusSearch-REL1_35-95b958b.tar.gz -C /var/www/mediawiki-x.y.z/extensions
Add the following statement to LocalSettings.php:
wfLoadExtension( 'CirrusSearch' );
Smoke test: go to Special:Version and verify that the extension is successfully installed.
Follow the installation instructions delivered with /var/www/mediawiki-1.35.0/extensions/CirrusSearch/README.
wfLoadExtension( 'Elastica' );
wfLoadExtension( 'CirrusSearch' );
$wgDisableSearchUpdate = true;
As root:
php /var/www/mediawiki-.../extensions/CirrusSearch/maintenance/UpdateSearchIndexConfig.php
Remove
$wgDisableSearchUpdate = true;
from LocalSettings.php.
php /var/www/mediawiki-.../extensions/CirrusSearch/maintenance/maintenance/ForceSearchIndex.php --skipLinks --indexOnSkip
php /var/www/mediawiki-.../extensions/CirrusSearch/maintenance/maintenance/ForceSearchIndex.php --skipParse
$wgSearchType = 'CirrusSearch';
SELinux Setup
If SELinux is enabled on the host, the httpd process may not be able to invoke into the elasticsearch server, with the following symptoms:
[CirrusSearch] Search backend error during near_match search for 'test' after 5: unknown: Couldn't connect to host, Elasticsearch down?
/var/log/audit/audit.log will contain something similar to:
type=AVC msg=audit(1637546254.160:75): avc: denied { name_connect } for pid=1216 comm="httpd" dest=9200 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:wap_wsp_port_t:s0 tclass=tcp_socket permissive=0
Use audit2allow to generate the SELinux policy to allow the denied operation. Follow: Template:SELinux Operations
Troubleshooting
Enable debugging as shown in:
[CirrusSearchRequests] near_match search for 'test' against {index} took 5 millis. Requested via web for 5b7883dcb7cd761f62397caa67819012 by executor 2078481799
[CirrusSearch] Search backend error during near_match search for 'test' after 5: unknown: Couldn't connect to host, Elasticsearch down?