Is there any free alternative for Cloudlinux? I mean for jailing particular accounts to increase WHM/Cpanel server stability.


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Option # 1 - CSF (free)

Config Server Firewall (CSF) can be used for limitting overload by killing excessive processes
values:
PT_USERMEM
PT_USERTIME
PT_USERKILL

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source: http://www.techhelpblog.com/2010/11/12/limit-processes-memory-usage-user-based-time-memory-cpanel-csf/
CSF readme: http://configserver.com/free/csf/readme.txt

CSF works on almost any linux server, so its not limitted to just cPanel.

Option # 2 - (Paid $9)

http://www.betterlinux.com/ (no OpenVZ support, same as Cloudlinux)

Option # 3 - Hive (Paid $14)

http://www.1h.com/products/hive