SUMMARY: zfs rollback issue

I asked:

> I am sure this is a trivial issue, but I am not finding the answer.
>
> I am experimenting with zfs and in particularly backing out patches or
other
> changes that go south.  With ufs we would break the mirror so that we could
> reboot from the mirror if we needed to back out the change.  With zfs we
would
> like to take a snapshot of the volume and then revert back to that snapshot
if
> necessary
>
> The pool on my test box is egate-pool.  It contains a mirror of two 146g
> drives.
>
> I took a zfs snapshot:
> zfs snapshot egate-pool@feb24
>
> root on cbar-test1:/# zfs list
> NAME                                  USED  AVAIL  REFER  MOUNTPOINT
> egate-pool                           6.46G   127G   106K  /egate-pool
> egate-pool@feb24                        1K      -   106K  -
> egate-pool/ROOT                      2.96G   127G    31K  legacy
> egate-pool/ROOT/s10s_u10wos_17b      2.96G   127G  2.93G  /
> egate-pool/ROOT/s10s_u10wos_17b/var  36.1M   127G  36.1M  /var
> egate-pool/dump                      1.50G   127G  1.50G  -
> egate-pool/export                      63K   127G    32K  /export
> egate-pool/export/home                 31K   127G    31K  /export/home
> egate-pool/swap                      2.00G   129G    16K  -
> root on cbar-test1:/#
>
> I then made a bunch of changes on the system (added users, changed shells,
> added directories, etc) and then attempted to back it out:
> zfs rollback egate-pool@feb24
>
> even after a reboot there is no rollback.  There also is no error, so I do
not
> know what it does not like.

The answer:

A very minor but important flag.  -r.  I did not do a recursivee snapshot of
the pool, so I was in effect only preserving changes to the contents of /.  I
needed to do "zfs snapshot -r yadda yadda yadda

I mentioned that I was looking into snapshots to integrate into patching.
Several individuals recommended that I look into  Live Update.  Thanks for the
suggestion.  I will do so.


Christopher L. Barnard
-------------------
comment your code as if the maintainer is a homicidal maniac who knows where
you live.
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