Can each container be a different Solaris patch level, so I can test patches in a “test” container before applying them to a “production” container?
There are two parts to the answer: 1) There is only one kernel running on the system, so all zones must be at the same patch level with respect to the kernel and core system components. Such patches can only be applied from the global zone, and they affect the global and all local zones equally. The KU is an example of such a patch. 2) Middleware such as Java Enterprise System can be patched on a per-zone basis. If the software can be installed in the local zone then it must be patchable from the local zone as well, regardless of the zone type, whole-root or sparse-root.
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