Date: Sun, 18 Dec 2016 13:20:31 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Alexander Leidinger <Alexander@leidinger.net>, SK <fbstable@cps-intl.org> Cc: freebsd-jail <freebsd-jail@freebsd.org> Subject: Re: ZFS and Jail :: nullfs mount :: nothing visible from host :: solved [partial] Message-ID: <58567F0F.4010404@quip.cz> In-Reply-To: <20161217195949.Horde.PTQ3AH5YpaT79dVSxM5UvNr@webmail.leidinger.net> References: <aa078173-e9f1-3f09-41d4-6613014b1119@cps-intl.org> <584986D0.3040109@quip.cz> <2b6346f8-ed02-0e6d-bd89-106098e7eb2d@cps-intl.org> <58499446.3050403@quip.cz> <eed9efad-9bac-9d36-b75e-c41f9ea72a8b@cps-intl.org> <5849C5BF.7020005@quip.cz> <fb56ab21-026b-408d-f712-ed7479e1f269@cps-intl.org> <584A9179.9060508@quip.cz> <b53fba06-bb7d-06d8-34a4-4677805fb175@cps-intl.org> <584A9D89.4040003@quip.cz> <3851c5d9-7646-b670-357e-ae937fcc7e8f@cps-intl.org> <584AB345.4080307@quip.cz> <33473585-3cb9-10d3-acf9-0a917c5a0079@cps-intl.org> <20161216141540.Horde.zfu3fokeVx7FuFkk7_s-nbW@webmail.leidinger.net> <d606c9ee-f5f6-55c5-0c99-01fd47a4a378@cps-intl.org> <20161217195949.Horde.PTQ3AH5YpaT79dVSxM5UvNr@webmail.leidinger.net>
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Alexander Leidinger wrote on 2016/12/17 19:59: > Quoting SK <fbstable@cps-intl.org> (from Fri, 16 Dec 2016 14:02:20 +0000): >> If I understand you correctly, what you are suggesting is, the dataset >> used by the jail itself for its root/base cannot be "worked on" from >> within the jail, but if I define a different dataset (under the same >> branch below the jail dataset), and attribute it to the jail, then I >> can manipulate that "other" dataset. Could you please confirm if I >> understood it correctly? > > Correct. > > You need the data in the root of the jail to boot, if you then attribute > this dataset to the jail, it will vanish until "zfs mount -a" is run (rc > script inside the jail). As it will vanish during the boot of the jail > (if added automatically), the rc script to mount all datasets can not be > found. [...] >> I think what you are trying to tell here is, unless and until that >> "vanished" dataset is put to use (mounted) from inside the jail, it >> will remain vanished/unusable from the host itself; however, once that >> dataset is put to use, the host system should be able to "see" and >> maybe even work on that dataset. Could you please confirm if I >> understood you correctly? > > Correct. > > A sub-dataset which is not needed to boot, or a dataset not within the > subtree of the jail (and not needed to boot) can be used. Thank you for this information! If it is somewhere in the docs it is well hidden to me :) Miroslav Lachman
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