Linked by Thom Holwerda on Wed 27th May 2009 14:59 UTC, submitted by R_T_F_M
FreeBSD FreeBSD's jails technology received an interesting new feature. "Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings."
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