Re: Relocating many homes in subfolders of a dedicated internal HDD

From	Soviet_Mario <SovietMario@CCCP.MIR>
Newsgroups	alt.os.linux
Subject	Re: Relocating many homes in subfolders of a dedicated internal HDD
Date	2019-06-17 02:05 +0200
Organization	A noiseless patient Spider
Message-ID	<qe6lfp$tka$1@dont-email.me> (permalink)
References	<qdu5oe$kkp$1@dont-email.me> <qe3avf$1s7c$1@saria.nerim.net>

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Il 15/06/19 19:47, Pascal Hambourg ha scritto:
> Le 13/06/2019 à 20:47, Soviet_Mario a écrit :
>>
>> scenario : install 2 more OS to test on dedicated separate 
>> disks (each in just one boot+root partition and one for 
>> swap_#1).
> (...)
>> Meanwhile, as I have a big NEW and certified hdd (non ssd, 
>> a WD-red 2 TB), I'd also be willing to move the actual 
>> data of every HOME of any distro, each in a separate 
>> subtree of "\homes" shared folder. I say shared as the 
>> device has to be mounted, but each distro will write in 
>> its own branch by default, letting me decide if not.
>>
>> So this I think is not a home sharing, just DATA sharing : 
>> just home relocation in a shared drive.
> 
> May I ask why you want to do this ?
> Why don't you simply want to create separate filesystems for 
> each OS /home ?

for record : I'm reading this AFTER my reply in the other 
thread. So, well, I did not actually forget or paid little 
attention : I hadn't read it already when I opened the other 
thread.

> 
>> I have thought of SYMLINKING.
>>
>> So the question : is it there a question to associate 
>> every home/user of one distro with the specific 
>> corresponding subfolder on another drive ?
>>
>> Is it possible ? safe ? What risks I should be aware of 
>> before trying ?
> 
> Possible ? yes. Safe ? probably not as safe as using per-OS 
> /home.
> 
> Symlinks can be used as part of one solution. For example on 
> OS "foo" after installing it :
> - Mount the big drive on, say, /data (and update fstab 
> accordingly)
> - move /home to /data/foo
> - create a symlink /home pointing to /data/foo

where do I have to put this symlink ? Directly in /
or in /home ?

For me it would be fine to move every user at the same time

> 
> Do the same on each other OS.
> 
> This solution has a disadvantage : all OSes can see all home 
> directories of all other OSes. Some users on different OSes 
> will probably have the same numerical User ID (many 
> distributions use UID=1000 for the first user). A user in 
> any OS can access the home directory of any other user which 
> has the same UID in any other OS.

this would be highly appreciated as my need is right to 
SHARE all data among distros. The various users are just 
myself, nobody else.
I would have had to take care to sync the UID and GID to the 
same values manually anyway (if I got what Carlos suggested).
The only different among the users is they must have their 
config files, nothing else

> 
> Other valuable solutions have been suggested :
> - bind mounts
> - Btrfs subvolumes
> 
> Most distributions will not allow to set up bind mounts 
> during the installation. 

the moment is not essential. The best solution is the 
simplest in this case.

> Not sure about Btrfs subvolumes. So 
> you probably will have to set this up after the installation.
> 
> I mention two other solutions for completeness :
> 
> 1) Change the default path where home directories are 
> created. If using adduser to create users, edit DHOME in 
> /etc/adduser.conf. If using useradd, edit HOME in 
> /etc/default/useradd.

is this method applicable also to just existing "principal" 
user account ? I just need one per each Distro actually

> Of course if a first user is created during the 
> installation, its home directory will not be created in the 
> alternate path. You can move its home directory with usermod 
> -d -m, or just delete this user.

ah, here it is !

I'm reading some man for usermode, saying the user to be 
relocated must not be login and, more over, none of its 
files opened (this last is obscure to me)

> 
> 2) Use LVM on the big drive and create a logical volume for 
> each OS home directory. This way they are much more isolated 
> than with other solutions.

but I'm not looking for isolatio, but sharing of everithing 
not strictly regarding the system itself.

> If you are concerned about disk 
> space allocation, note that you can easily resize logical 
> volume, much more easily than partitions.

§§§§§

Oh, this has nothing to do with the original question, but 
maybe with BTRF

I have put all .VDI (virtual box image files) on a BTRF 
partition on SSD

They are extremely fast to load (read) and even slower than 
on normal spinning disk on save (write).
What did I misconfigure for such a result ?


-- 
1) Resistere, resistere, resistere.
2) Se tutti pagano le tasse, le tasse le pagano tutti
Soviet_Mario - (aka Gatto_Vizzato)

Thread

Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-13 20:47 +0200
  Re: Relocating many homes in subfolders of a dedicated internal HDD "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-06-13 17:35 -0400
    Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-14 00:01 +0200
      Re: Relocating many homes in subfolders of a dedicated internal HDD "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-06-13 19:28 -0400
        Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-13 19:23 -0500
      Re: Relocating many homes in subfolders of a dedicated internal HDD "Carlos E.R." <robin_listas@es.invalid> - 2019-06-14 10:29 +0200
    Re: Relocating many homes in subfolders of a dedicated internal HDD marrgol <marrgol@address.invalid> - 2019-06-14 02:13 +0200
      Re: Relocating many homes in subfolders of a dedicated internal HDD "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-06-13 23:45 -0400
        Re: Relocating many homes in subfolders of a dedicated internal HDD Paul <nospam@needed.invalid> - 2019-06-14 07:34 -0400
          Re: Relocating many homes in subfolders of a dedicated internal HDD "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-06-14 09:59 -0400
            Re: Relocating many homes in subfolders of a dedicated internal HDD "Carlos E.R." <robin_listas@es.invalid> - 2019-06-15 13:08 +0200
              Re: Relocating many homes in subfolders of a dedicated internal HDD Paul <nospam@needed.invalid> - 2019-06-15 11:58 -0400
                Re: Relocating many homes in subfolders of a dedicated internal HDD "Carlos E.R." <robin_listas@es.invalid> - 2019-06-15 23:10 +0200
  Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-13 18:49 -0500
  Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 07:05 +0200
    Re: Relocating many homes in subfolders of a dedicated internal HDD "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-06-14 04:17 -0400
      Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-14 17:41 +0200
        Re: Relocating many homes in subfolders of a dedicated internal HDD William Unruh <unruh@invalid.ca> - 2019-06-14 15:58 +0000
        Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 18:04 +0200
      Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 17:58 +0200
        Re: Relocating many homes in subfolders of a dedicated internal HDD Aragorn <thorongil@telenet.be> - 2019-06-14 18:36 +0200
          Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-14 12:01 -0500
          Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 19:18 +0200
            Re: Relocating many homes in subfolders of a dedicated internal HDD Aragorn <thorongil@telenet.be> - 2019-06-14 20:11 +0200
              Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 21:44 +0200
              Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-18 12:50 +0200
                Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-18 21:50 +0200
                Re: Relocating many homes in subfolders of a dedicated internal HDD Aragorn <thorongil@telenet.be> - 2019-06-19 13:10 +0200
                Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-19 21:57 +0200
          Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-14 19:22 +0200
            Re: Relocating many homes in subfolders of a dedicated internal HDD Aragorn <thorongil@telenet.be> - 2019-06-14 20:02 +0200
    Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-14 17:36 +0200
      Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-14 10:50 -0500
      Re: Relocating many homes in subfolders of a dedicated internal HDD William Unruh <unruh@invalid.ca> - 2019-06-14 15:55 +0000
        Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-14 22:29 +0200
          Re: Relocating many homes in subfolders of a dedicated internal HDD William Unruh <unruh@invalid.ca> - 2019-06-14 20:52 +0000
            Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-15 02:07 +0200
              Re: Relocating many homes in subfolders of a dedicated internal HDD William Unruh <unruh@invalid.ca> - 2019-06-15 01:30 +0000
          Re: Relocating many homes in subfolders of a dedicated internal HDD Aragorn <thorongil@telenet.be> - 2019-06-15 08:59 +0200
            Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-17 19:43 +0200
  Re: Relocating many homes in subfolders of a dedicated internal HDD Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-15 19:47 +0200
    Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-17 02:05 +0200
      Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-16 20:23 -0500
      Re: Relocating many homes in subfolders of a dedicated internal HDD Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-18 13:52 +0200
        Re: Relocating many homes in subfolders of a dedicated internal HDD Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-18 18:36 +0200
          Re: Relocating many homes in subfolders of a dedicated internal HDD Bit Twister <BitTwister@mouse-potato.com> - 2019-06-18 12:04 -0500
          Re: Relocating many homes in subfolders of a dedicated internal HDD William Unruh <unruh@invalid.ca> - 2019-06-18 21:37 +0000
          Re: Relocating many homes in subfolders of a dedicated internal HDD Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-20 23:31 +0200
            Re: Relocating many homes in subfolders of a dedicated internal HDD "J.O. Aho" <user@example.net> - 2019-06-21 10:25 +0200

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