Date: Thu, 20 Mar 2014 09:30:33 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: Can ZFS boot from other than the root of a pool? Message-ID: <532AFB89.6060203@denninger.net> In-Reply-To: <CAPS9%2BSti9F0waFjgCfXtkxz5zW8sDp8=rv=HZujovpp_wg4cmQ@mail.gmail.com> References: <532AF77A.9010204@denninger.net> <CAOjFWZ7xy01UXkPrB2wfN3=YMn9ToHL81a4SHzToa5sDV0YUqA@mail.gmail.com> <CAOjFWZ7=ZczHsjrLo2cLjQYAdwhD7wc3kz37GXarbMLeciMySA@mail.gmail.com> <CAPS9%2BSti9F0waFjgCfXtkxz5zW8sDp8=rv=HZujovpp_wg4cmQ@mail.gmail.com>
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This is a cryptographically signed message in MIME format. --------------ms050905090305040909060601 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 3/20/2014 9:27 AM, Andreas Nilsson wrote: > On Thu, Mar 20, 2014 at 3:19 PM, Freddie Cash <fjwcash@gmail.com> wrote= : > >> Forgot to include the list in the original reply. >> >> Typos and terseness brought to you by the LG G2 running SlimKat. >> ---------- Forwarded message ---------- >> From: "Freddie Cash" <fjwcash@gmail.com> >> Date: Mar 20, 2014 7:17 AM >> Subject: Re: Can ZFS boot from other than the root of a pool? >> To: "Karl Denninger" <karl@denninger.net> >> Cc: >> >> >> On Mar 20, 2014 7:13 AM, "Karl Denninger" <karl@denninger.net> wrote: >>> For a number of reasons having to do with backup strategy I want to m= ount >> a ZFS root from "poolname/root" instead just "poolname." >>> That works ok; I can set in /boot/loader.conf: >>> vfs.root.mountfrom=3D"zfs:zroot/root" >>> >>> But -- I cannot actually boot from there. Unless the /boot directory= is >> in zfs:/zroot the system cannot find it, and I see no obvious way to >> "teach" the loader that I want it to look in the filesystem under the = top >> level. >>> This isn't a terrible pain as I can simply mount zroot on /mnt and th= en >> copy zroot/root/boot over to zroot/boot whenever I make changes to the= >> kernel or boot environment (which is infrequent) but I'm wondering if = I'm >> missing something that would make booting directly from the filesystem= >> where root is specified to be possible. >>> (Obviously until the loader.conf file is found the system doesn't kno= w >> where root is either, so this does look at first blush to be a "chicke= n and >> egg" problem.) >> >> Read up on Boot Environments, install the beadm port, set the bootfs >> property on the pool itself, and you'll be off to the races. >> > Yes. For quite some time. It is a bit easier on 9.2 and 10.0 and newer > where there is no strict need for /boot/zfs/zpool.cache for the mount o= f / > to succeed. > > I'm booting from tank/ROOT/10-STABLE-140310 om my workstation for examp= le. > To set it up (given the pool tank exists) > zfs create -o mountpoint=3Dnone tank/ROOT > zfs create tank/ROOT/yourpreferedname > zpool set bootfs tank/ROOT/yourpreferedname tank > make sure tank/ROOT/yourpreferedname has a "complete" install. > > Best regards > Andreas It LOOKS to me like this will work too: zpool set bootfs tank/bootfs =2E.. and in loader.conf (in /boot/loader.conf on tank/bootfs) set the=20 root SOMEWHERE ELSE. That has certain advantages, particularly if you want a GELI-encrypted ro= ot. I'll play with this a bit.... (the ability to make upgrades much less=20 dangerous in that an immediate-revert becomes pretty easy helps too) --=20 -- Karl karl@denninger.net --------------ms050905090305040909060601 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIFTzCC BUswggQzoAMCAQICAQgwDQYJKoZIhvcNAQEFBQAwgZ0xCzAJBgNVBAYTAlVTMRAwDgYDVQQI EwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkqhkiG9w0BCQEWIGN1c3Rv bWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0MB4XDTEzMDgyNDE5MDM0NFoXDTE4MDgyMzE5 MDM0NFowWzELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExFzAVBgNVBAMTDkthcmwg RGVubmluZ2VyMSEwHwYJKoZIhvcNAQkBFhJrYXJsQGRlbm5pbmdlci5uZXQwggIiMA0GCSqG SIb3DQEBAQUAA4ICDwAwggIKAoICAQC5n2KBrBmG22nVntVdvgKCB9UcnapNThrW1L+dq6th d9l4mj+qYMUpJ+8I0rTbY1dn21IXQBoBQmy8t1doKwmTdQ59F0FwZEPt/fGbRgBKVt3Quf6W 6n7kRk9MG6gdD7V9vPpFV41e+5MWYtqGWY3ScDP8SyYLjL/Xgr+5KFKkDfuubK8DeNqdLniV jHo/vqmIgO+6NgzPGPgmbutzFQXlxUqjiNAAKzF2+Tkddi+WKABrcc/EqnBb0X8GdqcIamO5 SyVmuM+7Zdns7D9pcV16zMMQ8LfNFQCDvbCuuQKMDg2F22x5ekYXpwjqTyfjcHBkWC8vFNoY 5aFMdyiN/Kkz0/kduP2ekYOgkRqcShfLEcG9SQ4LQZgqjMpTjSOGzBr3tOvVn5LkSJSHW2Z8 Q0dxSkvFG2/lsOWFbwQeeZSaBi5vRZCYCOf5tRd1+E93FyQfpt4vsrXshIAk7IK7f0qXvxP4 GDli5PKIEubD2Bn+gp3vB/DkfKySh5NBHVB+OPCoXRUWBkQxme65wBO02OZZt0k8Iq0i4Rci WV6z+lQHqDKtaVGgMsHn6PoeYhjf5Al5SP+U3imTjF2aCca1iDB5JOccX04MNljvifXgcbJN nkMgrzmm1ZgJ1PLur/ADWPlnz45quOhHg1TfUCLfI/DzgG7Z6u+oy4siQuFr9QT0MQIDAQAB o4HWMIHTMAkGA1UdEwQCMAAwEQYJYIZIAYb4QgEBBAQDAgWgMAsGA1UdDwQEAwIF4DAsBglg hkgBhvhCAQ0EHxYdT3BlblNTTCBHZW5lcmF0ZWQgQ2VydGlmaWNhdGUwHQYDVR0OBBYEFHw4 +LnuALyLA5Cgy7T5ZAX1WzKPMB8GA1UdIwQYMBaAFF3U3hpBZq40HB5VM7B44/gmXiI0MDgG CWCGSAGG+EIBAwQrFilodHRwczovL2N1ZGFzeXN0ZW1zLm5ldDoxMTQ0My9yZXZva2VkLmNy bDANBgkqhkiG9w0BAQUFAAOCAQEAZ0L4tQbBd0hd4wuw/YVqEBDDXJ54q2AoqQAmsOlnoxLO 31ehM/LvrTIP4yK2u1VmXtUumQ4Ao15JFM+xmwqtEGsh70RRrfVBAGd7KOZ3GB39FP2TgN/c L5fJKVxOqvEnW6cL9QtvUlcM3hXg8kDv60OB+LIcSE/P3/s+0tEpWPjxm3LHVE7JmPbZIcJ1 YMoZvHh0NSjY5D0HZlwtbDO7pDz9sZf1QEOgjH828fhtborkaHaUI46pmrMjiBnY6ujXMcWD pxtikki0zY22nrxfTs5xDWGxyrc/cmucjxClJF6+OYVUSaZhiiHfa9Pr+41okLgsRB0AmNwE f6ItY3TI8DGCBQowggUGAgEBMIGjMIGdMQswCQYDVQQGEwJVUzEQMA4GA1UECBMHRmxvcmlk YTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExDMRwwGgYD VQQDExNDdWRhIFN5c3RlbXMgTExDIENBMS8wLQYJKoZIhvcNAQkBFiBjdXN0b21lci1zZXJ2 aWNlQGN1ZGFzeXN0ZW1zLm5ldAIBCDAJBgUrDgMCGgUAoIICOzAYBgkqhkiG9w0BCQMxCwYJ KoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNDAzMjAxNDMwMzNaMCMGCSqGSIb3DQEJBDEW BBRz1dm0hps2maCg4nim0j96x5x1TzBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIG0BgkrBgEEAYI3EAQxgaYwgaMwgZ0xCzAJBgNV BAYTAlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoT EEN1ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkq hkiG9w0BCQEWIGN1c3RvbWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0AgEIMIG2BgsqhkiG 9w0BCRACCzGBpqCBozCBnTELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExEjAQBgNV BAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1zIExMQzEcMBoGA1UEAxMTQ3Vk YSBTeXN0ZW1zIExMQyBDQTEvMC0GCSqGSIb3DQEJARYgY3VzdG9tZXItc2VydmljZUBjdWRh c3lzdGVtcy5uZXQCAQgwDQYJKoZIhvcNAQEBBQAEggIADYbGCeEqrNeF8lGBc/2HQ25vNhMZ RKNaR9916URGK4FSc2QM5Q79mpNbEOa4fB/Q6360/AENcZdAzJtSi5Ks3p9fCQgCKhF+QiG/ cJ75cJJg51Bax5ZA+DPSk7d6KnL0BYM/Wx013pqEtgeZNwmeVxZuf2J4GdQPkhrHr3BFcEt9 EQiqX6jH2H2t1/7Kjd2CsPFKoZ2AYsMMeD9NrfOTwAZ8jGEdrdB2w76BNKHQxtrzxan8SE4b cKstz0qdi7oXXA8Q2QNo2CTTTfOS9uSMfxp7QtsE42tsjxW8maJG0TuarW+uQeoA11D73pob sDh7ATg01IqPy3tAYl3uU+IKyN3d+7Ylx4PYOyFDsHeSYo9qrgdsdbRcjtswpvwA948cA03c nO56tdzjzQjx3sOAQdfMBFMJ/5OeSdHokk2wmH2svbQqnAQ/zXK2njGLlThucG/bvQcwBprH wSFwUnF3hkblR4JUKcE/OqZ0par85XHCr7hWjYv5k4YDJkPOW5QVArJYbCYz5660vo4zGXd3 0WwKItR4qCbOL3m8DuZd0PJ5m5FnrD3S90yauiFKz+w3OeIpwgcUFGU2boVjWQdFKx4u4rxL 990Oa11qmQIUby3mykE5S7MtIBcQsFQ4DYBmZ/s627CJy2ouKszdL9PNDcBDiT7lIiBi13i1 tXdUHIoAAAAAAAA= --------------ms050905090305040909060601--
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