[ale] changes to fstab in fedora 20

Scott Castaline skotchman at gmail.com
Tue Mar 11 23:34:28 EDT 2014


Okay, so now I have noticed an error message which indicates to use 
systemctl status pub-Downloads.mount, to see more info. It's complaining 
about the ext4 fs and the superblock is bad. I've done this about 6 
times and get the same results. I have always just created the fs by 
"mkfs.ext4 </path/to/device>" which for this one would be 
/dev/mapper/ncc1701_02-pub_dnlds. I always thought that fs type was 
specified in the .ext4 part of mkfs. I've never used any other options 
except on occasion I used -L for labeling the fs for whatever reasons. I 
did notice that it seemed to do the fs rather quick, other than that I 
didn't notice any problems with the initialization process.

Below is excerpt of system log:

Mar 11 22:53:51 ncc1701 mount: mount: wrong fs type, bad option, bad 
superblock on /dev/mapper/ncc1701_02-pub_dnlds,
Mar 11 22:53:51 ncc1701 mount: missing codepage or helper program, or 
other error
Mar 11 22:53:51 ncc1701 mount: In some cases useful info is found in 
syslog - try
Mar 11 22:53:51 ncc1701 mount: dmesg | tail or so.

Mar 11 22:53:51 ncc1701 systemd: pub-Downloads.mount mount process 
exited, code=exited status=32
Mar 11 22:53:51 ncc1701 systemd: Failed to mount /pub/Downloads.
Mar 11 22:53:51 ncc1701 systemd: Dependency failed for Local File Systems.
Mar 11 22:53:51 ncc1701 systemd: Dependency failed for Mark the need to 
relabel after reboot.

the gap between the mount and the systemd entries had stuff not related 
to the problem.

Aside from scrapping the system and doing a full re-install anything 
else that I should try? Are their new options that I should be using 
that I'm not seeing in the man pages? I don't want to re-install as what 
will I do when I replace the drive that lead to this mess, re-install again?

Scott C.

On 03/11/2014 11:00 PM, Jim Kinney wrote:
>
> I do believe you are correct. A F20 encrypted laptop shows a pair of 
> partitions, one is boot the other is a type 83 . Pvscan shows the 
> source as being inside a container called luks-<long string UUID type> 
> with lvms inside it. Fstab shows / as type ext4 with options default, 
> x-systemd.device-timeout=0
>
> The /dev/mapper/ luks-* links to ../dm0. The lvms links to dm1,dm2, etc.
>
> It would not make sense to force lvm to understand encryption so it 
> must be the lvm container. Um. Duh.
>
> On Mar 11, 2014 5:49 PM, "Derek Atkins" <derek at ihtfp.com 
> <mailto:derek at ihtfp.com>> wrote:
>
>     Sorry, your thinking is faulty.
>
>     When you install a system with encrypted disk the installer
>     creates a /boot partition and a crypt partition. Then creates /
>     and swap inside an lvm inside the crypt.  When I get back to my
>     laptop I can show you all the partition info that shows this.
>
>     -derek
>
>     Sent from my HTC smartphone
>
>
>     ----- Reply message -----
>     From: "Jim Kinney" <jim.kinney at gmail.com
>     <mailto:jim.kinney at gmail.com>>
>     To: "Atlanta Linux Enthusiasts" <ale at ale.org <mailto:ale at ale.org>>
>     Subject: [ale] changes to fstab in fedora 20
>     Date: Tue, Mar 11, 2014 5:37 PM
>
>
>     I'll have to double check my laptop at home. I know the installer
>     will do the RightThing automagically so that's the easiest way to
>     fix it.
>
>     Seems like the PV has to be outside the crypt container at the
>     least as individual LVs can be crypted. Usuall routine is to crypt
>     everything but /boot so even swap get protected. In Fedora,
>     default setup is a /boot, a PV with a single LV that contains /
>     and swap and /home partitions. Thus my (probably faulty) thinking
>     that the encryption occurs inside the LV itself.
>
>
>     On Tue, Mar 11, 2014 at 5:19 PM, Derek Atkins <derek at ihtfp.com
>     <mailto:derek at ihtfp.com>> wrote:
>
>         I think you have those commands backwards. If you want to
>         create an encrypted drive ala the installer I think you need
>         to cryptsetup, then pvcreate, then lvcreate, then mkfs.  This
>         mirrors what my encrypted system looks like.  The lvm is
>         inside the crypto.
>
>         -derek
>
>         Sent from my HTC smartphone
>
>
>
>         ----- Reply message -----
>         From: "Jim Kinney" <jim.kinney at gmail.com
>         <mailto:jim.kinney at gmail.com>>
>         To: "Atlanta Linux Enthusiasts" <ale at ale.org <mailto:ale at ale.org>>
>         Subject: [ale] changes to fstab in fedora 20
>         Date: Tue, Mar 11, 2014 5:03 PM
>
>
>         I know the encrypt drives process JustWorks during
>         _installation_ of F20. I'm 90% certain it encrypts the
>         contents of an LVM and not the other way around. If you
>         encrypt a container that holds PVM/LVM IDs, the kernel will
>         not know how to use it (I think - still digging in systemd as
>         well). Also, F20 is using grub2 which is also a vertical
>         learning curve.
>
>         I think you need to go the following order:
>
>         pvcreate
>         lvcreate
>         cryptsetup
>         mkfs
>
>
>         On Tue, Mar 11, 2014 at 4:36 PM, Scott Castaline
>         <skotchman at gmail.com <mailto:skotchman at gmail.com>> wrote:
>
>             Anyone understand the changes made to filesystem mounting
>             at boot-time in Fedora 20? Apparently systemd now controls
>             it all? The reason i ask is that when I had originally
>             upgraded to F 20 I had setup all 5 drives in the
>             installer. Since then everytime the door leading to the
>             garage, under the room my systems are in, slams shut it
>             causes the floor to pop up and my system will sometimes
>             jump. Normally everyone is careful about opening and
>             closing this door and I had also moved the computers over
>             to the other side of the room the last time I went through
>             the hassle of crashed drives. This one day was
>             exceptionally windy and the door really slammed hard.
>             Immediately I started getting warnings of read/write
>             errors, bad sectors, etc., etc. on one drive then 2 more
>             drives suddenly unmounted. The system then rebooted itself
>             and never came back up.
>
>             Since it was toast I went ahead and ran smartctl tests
>             followed by badblocks which pointed to my 4th drive (hmm
>             not the 5th or 3rd drives). I then ran dd if=/dev/urandom
>             of=/dev/sd? on the remaining 4 drives. I did the boot
>             drive seperately so that I could get my system at least
>             partially back up. I reinstalled F 20 with just the one
>             hdd figuring that the remaining 3 drive I could manually
>             add back in. By the way I don't use raid so that is not to
>             be figured into my problem, I do however setup LUKS on the
>             raw device followed by LVM. My steps are:
>
>             1. cryptsetup luksFormat /dev/sd? (exact syntax maybe
>             wrong as I'm doing this by memory which admittedly has
>             gone downhill lately).
>
>             2. blkid /dev/sd? (to get the luks UUID of the drive for
>             the next 2 steps)
>
>             3. cryptsetup luksOpen /dev/sd? luks-<Block UUID >
>
>             4. pvcreate /dev/mapper/luks-<Block UUID >
>
>             5. vgcreate <name used for vg> /dev/mapper/luks-<Block UUID >
>
>             6. lvcreate -L <size of lv> -n <name of lv> <name of vg>
>
>             7. mkfs.ext4 /dev/mapper/vg-name/lv-name
>
>             8. I'll go ahead and mount it where I plan to mount it in
>             fstab and verify that all is well.
>
>             9. Add the luks UUID in /etc/crypttab and enter the
>             mounting info of the lv in fstab. (This is where it is
>             different. I noticed that the mount options part is
>             different from the past in that it'll have
>             "defaults;x-systemd.device-timeout=0 1 2" on lvs that were
>             created by the installer. So I duplicated this for the lvs
>             that I added.
>
>             10. Unmount lvs, close luks volume and reboot.
>
>             The system will then either hang on boot or dump out to
>             maintenance mode when trying to mount my lv. I can however
>             manually mount the lv and the boot will continue. So
>             what's the deal? Anyone know? This is the way I've done it
>             in the past with NFP. I found the docs on this very
>             confusing in that it keeps on referring to something else
>             which will refer to something else again, so on & so on,
>             eventually it goes around in a circle.
>
>             Hellllppp Meeeeeeeeeeee (in my best human-fly imitation
>             from the spider web).
>
>             Scott C.
>             _______________________________________________
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>             Ale at ale.org <mailto:Ale at ale.org>
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>
>
>
>         -- 
>         -- 
>         James P. Kinney III
>         ////
>         ////Every time you stop a school, you will have to build a
>         jail. What you gain at one end you lose at the other. It's
>         like feeding a dog on his own tail. It won't fatten the dog.
>         - Speech 11/23/1900 Mark Twain
>         ////
>         http://heretothereideas.blogspot.com/
>         ////
>
>         _______________________________________________
>         Ale mailing list
>         Ale at ale.org <mailto:Ale at ale.org>
>         http://mail.ale.org/mailman/listinfo/ale
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>
>
>
>
>     -- 
>     -- 
>     James P. Kinney III
>     ////
>     ////Every time you stop a school, you will have to build a jail.
>     What you gain at one end you lose at the other. It's like feeding
>     a dog on his own tail. It won't fatten the dog.
>     - Speech 11/23/1900 Mark Twain
>     ////
>     http://heretothereideas.blogspot.com/
>     ////
>
>     _______________________________________________
>     Ale mailing list
>     Ale at ale.org <mailto:Ale at ale.org>
>     http://mail.ale.org/mailman/listinfo/ale
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>     http://mail.ale.org/mailman/listinfo
>
>
>
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