Probably the server computer or the Apache server has crushed.
Check if the server is running by running the command
ps auxw | grep httpd
If the server is not running, restart it by the command
Sometimes the Apache server crashes in such a way that it appears to be running and stops responding to the command
/etc/init.d/httpd stopIn this case, do the following:
killall httpd2 /etc/init.d/httpd stop /etc/init.d/httpd start
There may be an error message, for example "Cannot connect to the search daemon".
Look into spider log file in the directory /var/locust/log. It may have a message indicating what happened. Restart the spider.
The simplest way is to restart all spiders by the commands
/etc/init.d/httpd startThe first command may have to be repeated twice to take effect.
Sometimes the spider simply stops. For large indexes we have two alternate databases, for example llib_a and llib_b for the Links Library. If spider stopped, it is best to erase the database and start spidering anew. For large indexes use alternate database for spidering. When spidering is finished, switch the search engine to the alternative database by editing the search daemon start-up file /etc/init.d/locust.