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Tag Archives: server load spike
How to Stop High Server Load from Distributed Botnets, Scrapers, and Database Queue Locks
When a server load spikes to 30, 50, or 100+, most sysadmins panic and start haphazardly restarting services or blocking random IP addresses. However, modern attacks are rarely as simple as a single bad IP.
Today’s botnets use distributed Layer 7 (HTTP) floods, rotating through hundreds of unique IPs with only 1 connection each, exploiting web server application queues, fake WordPress scanners, background AJAX polling scripts, and WordPress admin-ajax.php endpoints that lock up MySQL.
This comprehensive guide covers how to diagnose,
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Posted in Coding, Server Admin & Security
Tagged .htaccess, 127.0.0.1, 403 Forbidden errors, 404 errors, ajax, ajax polling, ajax requests, apache, apache rate limiting, automated system tasks, bingbot, botnets, cache, caching, cpu, cpu load, cron jobs, csf, csf whitelist, CT_BLOCK_TIME, CT_LIMIT, CT_PORTS, database polling, database queue locks, ddos attacks, distributed attack, Googlebot, high server load, http, ip address, Jeypack, layer 7, linux, load averages, mibew messenger, mod_evasive, mysql, operator refresh time, php, processes, RAM, scrapers, script, server attack, server load, server load spike, subnet attack, sysadmin commands, whitelist, whm, xmlrpc.php
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