Is fsck obsolet for journaling FS? - Was: How do I Automount [snip]

Robert Heller heller at deepsoft.com
Sun Nov 29 20:15:37 UTC 2015


At Sun, 29 Nov 2015 20:56:42 +0100 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> 
> 
> hi,
> Am Sonntag, den 29.11.2015, 20:30 +0100 schrieb Petter Adsen:
> > On Sun, 29 Nov 2015 19:46:36 +0100
> > Oliver Grawert <ogra at ubuntu.com> wrote:
> > > also since this is relevant for the thread, please note that
> > > technically /etc/fstab has not been necessary in years in ubuntu
> > > (try
> > > it, move it away and reboot, your system will be fine and properly
> > > have mounted all fileystems) 
> > 
> > Using what mechanism? I now mount several NFS exports with fstab
> > entries, if I were to (re)move fstab, how would they be mounted on
> > the
> > next boot? Even in the case of only local filesystems, how would the
> > system know where to mount them?
> 
> lol, well, indeed if you have nfs mounts you will need fstab, i doubt
> you can specify them any differently in an easy way and wouldnt suggest
> you to remove it in that case ... for local filesystems you do not need
> an fstab in place, i.e. it is fine to boot without one but the file
> gets respected if it exists ...
> (i guess there are some autofs tricks to handle nfs mounts without
> fstab though)

I'm guessing you are thinking that most people only bother to have one file 
system (the root file system).  *Some* of us however have *many* file systems. 
For example my desktop system (currently running CentOS 5 w/ Xen):

/dev/mapper/sauron-c5root /                       ext3    defaults        1 1
#LABEL=/c5               /                       ext3    defaults        1 1
LABEL=/extra            /extra                  ext3    defaults        1 2
LABEL=/home             /home                   ext3    defaults        1 2
LABEL=/dvdisos          /dvdisos                ext3    defaults        1 2
LABEL=/wineC            /wineC                  ext3    defaults        1 2
LABEL=/distrocds        /distrocds              ext3    defaults        1 2
LABEL=/Stuff            /Stuff                  ext3    defaults        1 2
#LABEL=/c5var            /var                    ext3    defaults        1 2
LABEL=/c5usr            /usr                    ext3    defaults        1 2
LABEL=/boot             /boot                   ext2    defaults        1 2
LABEL=C5_SM		/home3/heller/Deepwoods	ext3	defaults	1 2
LABEL=localrepo         /var/www/localrepo      ext3	defaults	1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=Swap              swap                    swap    defaults        0 0
#LABEL=REPOS             /repos                  ext3    noauto,user,rw,exec  0 0
# Centos 5.11 DVDs
/distrocds/CentOS/5/CentOS-5.11-i386-bin-DVD-1of2.iso /centos511i386/1 iso9660 ro,loop=/dev/loop2 0 0
/distrocds/CentOS/5/CentOS-5.11-i386-bin-DVD-2of2.iso /centos511i386/2 iso9660 ro,loop=/dev/loop3 0 0
/distrocds/CentOS/5/CentOS-5.11-x86_64-bin-DVD-1of2.iso /centos511x86_64/1 iso9660 ro,loop=/dev/loop4 0 0
/distrocds/CentOS/5/CentOS-5.11-x86_64-bin-DVD-2of2.iso /centos511x86_64/2 iso9660 ro,loop=/dev/loop5 0 0
# FC 15
#/distrocds/Fedora/Fedora-15-x86_64-DVD.iso /fc15x86_64  iso9660 ro,loop=/dev/loop6 0 0
#/distrocds/Fedora/Fedora-15-i386-DVD.iso /fc15i386  iso9660 ro,loop=/dev/loop7 0 0
# Ubuntu 11.10
#/distrocds/Ubuntu/Oneiric/ubuntu-11.10-desktop-amd64.iso /ub11x86_64  iso9660 ro,loop=/dev/loop8 0 0
# Mint 14 (xfce)
#/distrocds/Mint/linuxmint-14.1-xfce-dvd-32bit.iso /mint14xfcei386  iso9660 ro,loop=/dev/loop9 0 0
# Centos 6.4 DVDs
#/distrocds/CentOS/6/CentOS-6.4-i386-bin-DVD1.iso /centos64i386/1  iso9660 ro,loop=/dev/loop11 0 0
#/distrocds/CentOS/6/CentOS-6.4-i386-bin-DVD2.iso /centos64i386/2  iso9660 ro,loop=/dev/loop12 0 0
#/distrocds/CentOS/6/CentOS-6.4-x86_64-bin-DVD1.iso /centos64x86_64/1  iso9660 ro,loop=/dev/loop13 0 0
#/distrocds/CentOS/6/CentOS-6.4-x86_64-bin-DVD2.iso /centos64x86_64/2  iso9660 ro,loop=/dev/loop14 0 0
# removable media
/dev/dvdrw               /media/cdrom            auto user,noauto,ro     0 0
/dev/dvdrw               /mnt/cdchanger/data     auto user,noauto,ro     0 0
/dvdisos/temp.udf	/mnt/tempudf		 udf  user,noauto,loop,uid=amanda,gid=disk	 0 0





> 
> > 
> > Also, you said (in an earlier message):
> > 
> > > nowadays mtab is (or should be, i dont know if update-manager
> > > already
> > > switches it over on upgrades yet for all releases) a link
> > > to /proc/mounts (until it hopefully goes away within the next year
> > > or
> > > two)
> > 
> > What goes away - mtab or /proc/mounts?
> 
> mtab indeed ... it is an ugly wart (dynamically created file at boot in
> /etc ...)
> 
> ciao
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-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services
http://www.deepsoft.com/  -- Linux Administration Services
heller at deepsoft.com       -- Webhosting Services
                                                                      



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