Will my reconstructed fstab work?
A few days ago using vim I added to my desktop fstab file a line for a
new portable storage device. in the process I somehow managed to screw
up fstab. Unfortunately I saved the screwed up version of fstab before
I noticed the damage done to it.
As I had no fstab backup -- to correct later -- I had to reconstruct
fstab using the information produced by blkid for the missing UUIDs. I
think the reconstruction is correct, but I have since been afraid to
close the computer if because of a faulty fstab I would be unable to
reopen it
I would consequently appreciate help in verifying the essential fstab
lines, numbered 11-20 in the reconstructed fstab quoted below and
thereby assuage my reopening fears. (Lines 26-40 relating to portable
storage devices I checked myself; they all work.)
Basic Information: two internal hard drives, /dev/sda and /dev/sdb,
each divided into two small partitions of equal size. Sda1 is used for
/boot/efi, lines 13 and 15. Partition sdb1, line 17, is currently
unused; in time I will copy to it what is in sda1. Partitions sda2 and
sdb2 form a RAID1, with the five LVM partitions listed in lines 11, 18,
19 and 20. Operating system is Debian Bullseye.
If anybody in interested, following the reconstructed fstab quoted
below is quoted further below how the fsab looked right after the screw
up.
01 # /etc/fstab: static file system information.
02 #
03 # Use 'blkid' to print the universally unique identifier for a
04 # device; this may be used with UUID= as a more robust way to name
devices
05 # that works even if disks are added and removed. See fstab(5).
06 #
07 # Systemd generates mount units based on this file, see systemd.mount(5).
08 # Please run 'systemctl daemon-reload' after making changes here.
09 #
10 # <file system> <mount point> <type> <options> <dump> <pass>
11 /dev/mapper/Morcom-ROOT / ext4 errors=remount-ro 0 1
12 # /boot/efi was on /dev/sda1 during installation
13 UUID=3020-1029 /boot/efi vfat umask=0077 0 1
14 # /dos was on /dev/sda1 during installation
15 UUID=3020-1029 /dos vfat utf8 0 0
16 # /dos2 was on /dev/sdb1 during installation
17 UUID=2AF2-0A16 /dos2 vfat utf8 0 0
18 /dev/mapper/Morcom-HOME_crypt /home ext4 defaults 0 2
19 /dev/mapper/Morcom-VAR /var ext4 defaults 0 2
20 /dev/mapper/Morcom-SWAP_crypt none swap swap 0 0
21 /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0
22 tmpfs /tmp tmpfs nodev,nosuid,size=20% 0 0
23 UUID=c5444477-7f18-4443-a77b-c5827f977449 /media/fdr ext2
user,noauto,noatime 0 0
24 UUID=33cebfb3-b568-493f-853b-e1b7ca5cc3a2 /media/fde ext2
user,noauto,noatime 0 0
25 # -e8b57fb2ac09/media/ssda ext4 user,npauto,noatime 0 0
26 UUID=la449167-8497-4471-ae0c-e8b57fb2ac09 /media/phda ext4
user,noauto,noatime 0 0
27 UUID=0fee2d01-2441-4699-a4ae-bb45c417b8ee /media/ssda ext4
user,noauto,noatime 0 0
28 UUID=e26255ab-e6c5-4bcd-941c-7378b7cf4083 /media/ssdb ext4
user,noauto,noatime 0 0
29 UUID=3DB1-1700 /media/fdg vfat user,noauto,noatime 0 0
30 UUID=5966-5502 /media/fdp vfat user,noauto,noatime 0 0
31 UUID=1170-1657 /media/hca vfat user,noauto,noatime 0 0
32 UUID=0E0A-0F26 /media/hcb vfat user,noauto,noatime 0 0
33 UUID=1E82-122E /media/hcc vfat user,noauto,noatime 0 0
34 UUID=1D1F-1032 /media/xca exfat user,noauto,noatime 0 0
35 UUID=1909-1458 /media.xcb exfat user,noauto,noatime 0 0
36 UUID=6238-3434 /media/xcc exfat user,noauto,noatime 0 0
37 UUID=206F-163F /media/xcd exfat user,noauto,noatime 0 0
38 UUID=3630-6530 /media/xce exfat user,noauto,noatime 0 0
39 UUID=3065-6630 /media/xcf exfat user,noauto,noatime 0 0
40 LABEL=ostree /media/phdc ext4 user,noauto,noatime 0 0
Right after the screw up the fstab looked like this.
01 -e8b57fb2ac09static file system information.
02 -e8b57fb2ac09
03 -e8b57fb2ac09lkid' to print the universally unique identifier for a
04 -e8b57fb2ac09vice; this may be used with UUID= as a more robust way
to name devices
05 -e8b57fb2ac09at works even if disks are added and removed. See fstab(5).
06-e8b57fb2ac09
07 -e8b57fb2ac09d generates mount units based on this file, see
systemd.mount(5).
08 -e8b57fb2ac09n 'systemctl daemon-reload' after making changes here.
09 -e8b57fb2ac09
10 -e8b57fb2ac09ile system> <mount point> <type> <options> <dump> <pass>
11 -e8b57fb2ac09ev/mapper/Morcom-ROOT / ext4
errors=remount-ro 0 1
12 -e8b57fb2ac09fi was on /dev/sda1 during installation
13 -e8b57fb2ac09020-1029 /boot/efi vfat umask=0077 0 1
14-e8b57fb2ac09ot was on /dev/sda1 during installation
15 -e8b57fb2ac09020-1029 /dos vfat utf8 0 0
16 -e8b57fb2ac09os2 was on /dev/sdb1 during installation
17-e8b57fb2ac09AF2-0A16 /dos2 vfat utf8 0 0
18 -e8b57fb2ac09mapper/Morcom-HOME_crypt /home ext4 defaults
0 2
19 -e8b57fb2ac09mapper/Morcom-VAR /var ext4 defaults 0 2
20 -e8b57fb2ac09mapper/Morcom-SWAP_crypt none swap swap 0
0
21 -e8b57fb2ac09r0 /media/cdrom0 udf,iso9660 user,noauto 0 0
22 -e8b57fb2ac09tmpfs nodev,nosuid,size=20% 0 0
23 -e8b57fb2ac0944477-7f18-4443-a77b-c5827f977449 /media/fdr ext2
user,noauto,noatime 0 0
24 -e8b57fb2ac09cebfb3-b568-493f-853b-e1b7ca5cc3a2 /media/fde ext2
user,noauto,noatime 0 0
25 -e8b57fb2ac09/media/ssda ext4 user,noauto,noatime 0 0
26 -e8b57fb2ac099167-8497-4471-ae0c-e8b57fb2ac09 /media/phda ext4
user,noauto,noatime 0 0
27 UUID=0fee2d01-2441-4699-a4ae-bb45c417b8ee /media/ssda ext4
user,noauto,noatime 0 0
28 UUID=e26255ab-e6c5-4bcd-941c-7378b7cf4083 /media/ssdb ext4
user,noauto,noatime 0 0
29 UUID=3DB1-1700 /media/fdg vfat user,noauto,noatime 0 0
30 UUID=5966-5502 /media/fdp vfat user,noauto,noatime 0 0
31 UUID=1170-1657 /media/hca vfat user,noauto,noatime 0 0
32 UUID=0E0A-0F26 /media/hcb vfat user,noauto,noatime 0 0
33 UUID=1E82-122E /media/hcc vfat user,noauto,noatime 0 0
34 UUID=1D1F-1032 /media/xca exfat user,noauto,noatime 0 0
35 UUID=1909-1458 /media.xcb exfat user,noauto,noatime 0 0
36 UUID=6238-3434 /media.xcc exfat usr,noauto,nonatime 0 0
37 UUID=206F-163F /media/xcd exfat user,noauto,noatime 0 0
38 UUID=3630-6530 /media/xce exfat user,noauto,noatime 0 0
39 UUID=3065-6630 /media/xcf exfat user,noauto,noatime 0 0
40 LABEL=ostree /media/phdc ext4 user,noauto,noatime 0 0
The screw up started a few days ago when I entered into the file a new
portable storage device, line 26 above. That entry itself was
successful. In addition however the beginning of the text of all lines
1-26 was overwritten by -e8b57fb2ac09, which happens to be the last 12
digits, plus the preceding hyphen, of the UUID of the added storage
device on line 26. Lines 27-40 were spared the overwrites. I have no
idea how these overwrites happened; it certainly was not the result of
any conscious action on my part.
Regards, Ken Heard
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