Question
How to enable bandwidth control, the number of connections and resources limits for domains?
Answer
Enabling bandwidth and number of connections (Plesk Onyx only)
Warning: The feature is available only if Nginx is disabled on the server
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Install the support for the Bandwidth Limiter for Apache through Tools & Settings > Updates and Upgrades > Add/Remove Components > Web hosting > Apache > mod_bw.
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Go to Tools & Settings > Services Management and disable Reverse Proxy Server (nginx).
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Configure Maximum Bandwidth usage and Connections limit for a domain in Domains > example.com > Bandwidth Limiting.
Enabling resource limiting
Warning: The control of system resources usage is supported only in operating systems no earlier than Debian 9, Ubuntu 16.04, CentOS/RHEL 7.
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Go to Tools & Settings > Updates and Upgrades > Add/Update Components and install Resource Controller (Cgroups) component.
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Customize resources limitation for domains in Service Plans > example_plan > RAM, CPU, Disk I/O tab.
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