CloudLinux allows restricting customers who use too much resources. You can set the limits in Cluster settings → CloudLinux limits.
LVE
Note:
LVE limits apply only to Apache processes when executing PHP or CGI scripts. Dovecot/Exim processes are not subject to limits.
LVE limits will be applied to users if individual settings are not specified. You can set individual limits when adding or editing a user.
CPU load limit — in %. 100% indicates CPU speed relative to one core;
Total number of processes per user;
Physical memory — the maximum amount of physical memory that can be allocated to a user, in Mib. It includes shared memory used by the customer, as well as disk cache.
I/O limit — the maximum data throughput per user in Kbit/sec. It includes read and write operations;
LVE concurrent connections — the maximum number of entries into LVE per user.
Details
The limits are specified in /etc/container/ve.cfg.