PLDWWW: Docs/Vserver

[arekm]

Author: arekm   Date: Wed Nov  4 09:43:58 2009 GMT
Module: PLDWWW   URL: http://www.pld-linux.org/Docs/Vserver?action=diff&rev2=137&rev1=136
---- Log message:
special dedication for blues

---- Page affected: Docs/Vserver

---- Diffs:

================================================================
The comment on the change is:
special dedication for blues

  
  Almost all kernels (including 2.6.27.x and 2.6.30/31) with vserver patch have a bug that causes oopses in pick_next_task_fair when using `sched_hard' in vserver/xyz/flags.
  
- Temporary solution is to avoid using sched_hard. Issue is worked on.
+ Temporary solution is to avoid using sched_hard. Latest 2.6.31 patches contain different way to get behaviour similar to sched_hard - it's called CFS hard limit and is explained in kernel documentation (in vserver patch).
  
+ === When using nice and su (for example, in the updatedb cron job), I get: su: Permission denied. ===
+ 
+ A guest cannot lower its nice value - and that's what 'su' does through pam_limits which sets a nice value of 0. 
+ 
+ Solution: set SYS_NICE bcapability for guest to allow it to lower it's nice value.
  
  == Debian or Ubuntu guest installation ==