Groups > linux.debian.user > #195444

Re: Backup problem using "cp"

From	Jude DaShiell <jdashiel@panix.com>
Newsgroups	linux.debian.user
Subject	Re: Backup problem using "cp"
Date	2018-05-07 20:00 +0200
Message-ID	<vMSAx-4nz-5@gated-at.bofh.it> (permalink)
References	<vMMEP-BP-51@gated-at.bofh.it> <vMN7R-11n-31@gated-at.bofh.it> <vMO3U-1Cc-9@gated-at.bofh.it> <vMRXQ-487-13@gated-at.bofh.it>
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On Mon, 7 May 2018, Kushal Kumaran wrote:

> Date: Mon, 7 May 2018 13:15:48
> From: Kushal Kumaran <kushal@locationd.net>
> To: debian-user@lists.debian.org
> Subject: Re: Backup problem using "cp"
> Resent-Date: Mon,  7 May 2018 17:16:09 +0000 (UTC)
> Resent-From: debian-user@lists.debian.org
> 
> Richard Owlett <rowlett@cloud85.net> writes:
>
>> On 05/07/2018 07:01 AM, Thomas Schmitt wrote:
>>> Hi,
>>>
>>> Richard Owlett wrote:
>>>> richard@debian-jan13:~$ stat / | fgrep Device
>>>> Device: 80eh/2062d      Inode: 2           Links: 22
>>>> richard@debian-jan13:~$ stat /media | fgrep Device
>>>> Device: 80eh/2062d      Inode: 131073      Links: 5
>>>
>>> "/media" was not the directory to examine.
>>> You need to examine the directory which you gave as second argument to cp.
>>> In your initial post of this thread the cp command is quoted as
>>>
>>>    cp -ax /  "/media/richard/MISC
>>>    backups/dev_sda14/"
>>>
>>> (Dunno whether the line break in that mail is significant.)
>>
>> No the _apparent_ line break was an artifact of email quoting process.
>> I can't rerun the diagnostic at the moment - hardware fully occupied
>> with testing my proposed workaround, which works so far but progress
>> resembles molasses running uphill on Pluto in winter ;/
>>
>>
>>>
>>>
>>>> I gather that "cp" is then an inappropriate tool.
>>>
>>> That's not decided yet.
>>>
>>> If your cp target directory had a different device number, then cp option -x
>>> did not what it is supposed to do.
>>>
>>> But if your target directory was not the mount point of the USB disk and
>>> not inside the filesystem of the USB disk, then you made a mistake by
>>> giving that directory as target.
>>
>> Understood.
>>
>>>
>>>
>>>> "tar" is inappropriate for my preferences - I was attempting to use "cp" as
>>>> there would be multiple files &/or directories as input *and* output.
>>>
>>> You could use multiple tar commands.
>>> (I doubt that you can talk cp into addressing more than one target.)
>>
>> Communication confusion.
>> My goal was to copy root and its sub-directory to a directory on
>> another physical device.
>>
>
> Are you using an LVM volume as your root?  Then mounting a snapshot at
> some location and copying from there is a good option.  This is what I
> do for my own backups.
>
> If you're not using LVM volumes, you could still use bind mounts for
> this.  Run:
>
>  # mkdir -p /mnt/source
>  # mount --bind -o ro / /mnt/source
>
> (The -o ro option is to make the /mnt/source mount read only.  I
> understand you intend to use this as a backup source, so read-only
> access should be sufficient.  If you change it to not be read-only, be
> cautious when changing things in /mnt/source, because it is the same
> filesystem as /)
>
> Now /mnt/source is exactly the root filesystem.  Other filesystems
> mounted (such as /dev or /proc) would only be present as empty
> directories in /mnt/source.  After you're done copying, remove the bind
> by running:
>
>  # umount /mnt/source
>
> This way, you do not have to figure out an exclude list or instruct
> tools to stop at filesystem boundaries.
>
> Make sure you do verify the files and directories you need are included.
> If some of the required files are not part of the root filesystem, then
> bind-mount them at the proper location under /mnt/source as well.  For
> example, if your /home is a different filesystem, and you need it to be
> part of your copying:
>
>  # mkdir -p /mnt/source
>  # mount --bind -o ro / /mnt/source
>  # mount --bind -o ro /home /mnt/source/home
>
> Then unmounting after you finish copying will be in the reverse order:
>
>  # umount /mnt/source/home
>  # umount /mnt/source
>
Tar has a -T file and an -X file set of options too.  Of course files 
with includes and excludes will have to exist before the copying for that 
to work.

>

--

Thread

Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-06 16:30 +0200
  Re: Backup problem using "cp" "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-06 16:40 +0200
    Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-06 16:50 +0200
      Re: Backup problem using "cp" "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-06 17:20 +0200
        Re: Backup problem using "cp" Cindy-Sue Causey <butterflybytes@gmail.com> - 2018-05-06 17:30 +0200
        Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 13:40 +0200
          Re: Backup problem using "cp" "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-07 14:10 +0200
            Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 15:10 +0200
              Re: Backup problem using "cp" "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-07 15:30 +0200
                Re: Backup problem using "cp" Bob Weber <bobrweber@gmail.com> - 2018-05-07 16:00 +0200
                Re: Backup problem using "cp" Dan Norton <dnorton@mindspring.com> - 2018-05-07 16:50 +0200
                Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 16:10 +0200
                Re: Backup problem using "cp" David Wright <deblis@lionunicorn.co.uk> - 2018-05-08 03:10 +0200
              Re: Backup problem using "cp" Kushal Kumaran <kushal@locationd.net> - 2018-05-07 19:20 +0200
                Re: Backup problem using "cp" Jude DaShiell <jdashiel@panix.com> - 2018-05-07 20:00 +0200
            Running of rrequested tests - [was Re: Backup problem using "cp"] Richard Owlett <rowlett@cloud85.net> - 2018-05-08 17:20 +0200
              Re: Running of rrequested tests - [was Backup problem using "cp"] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-08 17:50 +0200
                Re: Running of rrequested tests - [was Backup problem using "cp"] Richard Owlett <rowlett@cloud85.net> - 2018-05-08 19:40 +0200
                Re: Running of rrequested tests - [was Backup problem using "cp"] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-08 22:30 +0200
                Re: Running of rrequested tests - [was Backup problem using "cp"] Richard Owlett <rowlett@cloud85.net> - 2018-05-09 14:00 +0200
                Re: Running of rrequested tests - [was Backup problem using "cp"] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-09 15:00 +0200
              Re: Running of rrequested tests - [was Re: Backup problem using "cp"] The Wanderer <wanderer@fastmail.fm> - 2018-05-08 17:50 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] Richard Owlett <rowlett@cloud85.net> - 2018-05-08 19:50 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] The Wanderer <wanderer@fastmail.fm> - 2018-05-09 04:50 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] Richard Owlett <rowlett@cloud85.net> - 2018-05-09 14:30 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] The Wanderer <wanderer@fastmail.fm> - 2018-05-09 14:50 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] Richard Hector <richard@walnut.gen.nz> - 2018-05-09 15:00 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] David Wright <deblis@lionunicorn.co.uk> - 2018-05-09 22:30 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] Greg Wooledge <wooledg@eeg.ccf.org> - 2018-05-09 22:40 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] David Wright <deblis@lionunicorn.co.uk> - 2018-05-10 16:00 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] The Wanderer <wanderer@fastmail.fm> - 2018-05-10 05:00 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] David Wright <deblis@lionunicorn.co.uk> - 2018-05-10 16:20 +0200
                Re: Running of rrequested tests - [was Re: Backup problem using "cp"] David Wright <deblis@lionunicorn.co.uk> - 2018-05-08 21:50 +0200
          Re: Backup problem using "cp" Dan Purgert <dan@djph.net> - 2018-05-07 14:10 +0200
            Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 15:00 +0200
              Re: Backup problem using "cp" Dan Purgert <dan@djph.net> - 2018-05-07 15:20 +0200
              Re: Backup problem using "cp" Andy Smith <andy@strugglers.net> - 2018-05-07 15:30 +0200
                Re: Backup problem using "cp" "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-07 16:00 +0200
                Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 16:20 +0200
                Re: Backup problem using "cp" David Wright <deblis@lionunicorn.co.uk> - 2018-05-08 03:20 +0200
                Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 16:10 +0200
          Re: Backup problem using "cp" David Griffith <dave@661.org> - 2018-05-07 15:00 +0200
            Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 15:50 +0200
            Re: Backup problem using "cp" Richard Hector <richard@walnut.gen.nz> - 2018-05-07 16:00 +0200
              Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-07 16:40 +0200
          Re: Backup problem using "cp" Charlie Gibbs <cgibbs@surfnaked.ca> - 2018-05-07 20:30 +0200
          Re: Backup problem using "cp" David Wright <deblis@lionunicorn.co.uk> - 2018-05-08 03:00 +0200
  Re: Backup problem using "cp" Dan Purgert <dan@djph.net> - 2018-05-06 16:50 +0200
  Re: Backup problem using "cp" Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-06 17:40 +0200
    Re: Backup problem using "cp" Richard Owlett <rowlett@cloud85.net> - 2018-05-06 21:00 +0200
      Re: Backup problem using "cp" David Wright <deblis@lionunicorn.co.uk> - 2018-05-07 00:00 +0200
      Re: Backup problem using "cp" Jonathan Dowland <jmtd@debian.org> - 2018-05-10 10:30 +0200
        Re: Running of rrequested tests - [was Backup problem using "cp"] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-10 11:30 +0200
        Re: Backup problem using "cp" David Wright <deblis@lionunicorn.co.uk> - 2018-05-10 15:40 +0200
  SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 15:10 +0200
    Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} <tomas@tuxteam.de> - 2018-05-11 15:20 +0200
      Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 15:30 +0200
        Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} <tomas@tuxteam.de> - 2018-05-11 17:30 +0200
        Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Curt <curty@free.fr> - 2018-05-11 17:40 +0200
          Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 19:30 +0200
          Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Gene Heskett <gheskett@shentel.net> - 2018-05-11 19:50 +0200
            Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 22:30 +0200
    Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-11 16:50 +0200
      Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 20:00 +0200
        Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-11 21:50 +0200
          Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} Richard Owlett <rowlett@cloud85.net> - 2018-05-11 22:40 +0200
    Re: SUCCESS!!!! - was {Re: Backup problem using "cp"} David Wright <deblis@lionunicorn.co.uk> - 2018-05-11 17:30 +0200

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