Re: Making a full backup with DAR

On 08/07/2021 10:24, Сергей Цаболов wrote:
> Hello Denis,

Hello,

> 
> I found the file /etc/drrc on the attach
> 
> If I use the command :
> 
> dar -v -m 256  -s 1000M -D -R / -c `date -I`_data -Z "*.gz" -Z "*.bz2"
> -Z "*.zip" -Z "*.png" -P srv -P dev -P proc -P sys -P tmp -P run -P mnt
> -P media par2
> 
> give the output
> 
> Arguments read from /etc/darrc :
>  "/srv/back-rsync/viavi/archive"  I add the path to backups

OK, there is something wrong in the par2 target found in /etc/darrc,
according the file you attached in your email, "par2" target is replaced
by the following:

 -B "/usr/share/doc/dar/examples/dar_par.dcf"

If this file is the one provided with dar, it should trigger the
following options (creation context):

-E '/usr/share/doc/share/examples/dar_par_create.duc "%p" "%b" %N %e %c 2'

%p is substitued by the backup path: here the backup is `date -I` which
does not contain any '/' thus dar assumes the backup to be stored in the
current directory.
%b by the result of `date -I`
%N by the slice number
%e by 'dar' (the backup extension)
%c by the context

Only %p is unknown to me. Can you confirm that you run dar from the
"/srv/back-rsync/viavi/archive" directory?

> 
> User target found on command line or included file(s):
>     par2
>     /srv/back-rsync/viavi/archive
> Parse error: Given user target(s) could not be found:
> /srv/back-rsync/viavi/archive
> 
> After if remove the -v error is
> 
> Parse error: Given user target(s) could not be found:
> /srv/back-rsync/viavi/archive
> 
> After this i user the command
> 
> dar -v -m 256  -s 1000M -D -R / -c `date -I`_data  -Z "*.gz" -Z "*.bz2"
> -Z "*.zip" -Z "*.png" -P srv -P dev -P proc -P sys -P tmp -P run -P mnt
> -P media
> 
> output is :
> 
> Arguments read from /etc/darrc :
> 
> -Y and -Z are only useful with compression (-z option), ignoring any -Y
> and -Z option
> -m is only useful with compression (-z option), ignoring -m

This message in independent from the initial problem: yes, you need to
add compression if you want to use -m, -Z and -Y option.

> Creating low layer: Writing archive into a sar object (Segmentation and
> Reassembly) for slicing...
> Writing down the archive header...
> Adding a new layer on top: Caching layer for better performances...
> Adding a new layer on top: Escape layer to allow sequential reading...
> All layers have been created successfully
> Building the catalog object...
> Processing files for backup...

OK thus the backup is working when you removed par2, this confirms the
problem to be releated to

> 
> I see is working now but the problem is backup files maked in the
> directory stay now /etc/

Not sure to understand, you gave -R / thus dar should not save only
what's in /etc except if there is nothing else outside /srv /dev /proc
/sys /tmp /run /mnt and /media (as you have excluded all these by mean
of -P option)

> 
> Is working if I go to cd /srv/back-rsync/viavi/archive
> 
> But I not found how witout add path of backup

you can specify the backup path like this:

dar -c /srv/backup-rsync/viavi/archive/`date -I` ...

> 
> In
> http://dar.linux.free.fr/doc/mini-howto/dar-differential-backup-mini-howto.en.html#id5 
> not have  path of the backup (the full command line)

can you rather refer to the tutorial: the mini-howto has not been
updated by its author for long time and may suffer from obsolete syntaxes!

> 
> In the scripts demo the DIR is added
> 
> -------------------------------------------------------------------------------
> 
> #!/bin/bash
> 
> *DIR=/var/backups/system*
> FILE=${DIR}/`/bin/date -I`_diff
> PREV=`/bin/ls $DIR/*.dar|/usr/bin/tail -n 1`
> /usr/local/bin/dar -m 256 -y -s 600M -D -R / -c $FILE -Z "*.gz" \
>    -Z "*.bz2" -Z "*.zip" -Z "*.png" -P home/gradha -P tmp -P mnt \
>    -P dev/pts -P proc -P floppy -P burner -P cdrom \
>    -P var/backups -A ${PREV%%.*} > /dev/null
> /usr/local/bin/dar -t $FILE > /dev/null
> /usr/bin/find $DIR -type f -exec chown .gradha \{\} \;
> /usr/bin/find $DIR -type f -exec chmod 440 \{\} \;
> -----------------------------------------------------------------
> 
> /usr/local/bin/dar is not right path
> In my case is  /usr/bin/dar 

this depends on the way dar has been installed, most distro install in
/usr tree but if you install dar yourself, and use the default
installation path, dar will end in the /usr/local directory tree.

> 
> In command :
> 
> /usr/bin/dar -m 256 -y -s 600M -D -R / -c $FILE -Z "*.gz" -Z "*.bz2" -Z "*.zip" -Z "*.png" -P proc -P tmp -P mnt -P dev -P sys -P srv -P mnt -P media -P  -A ${PREV%%.*} > /dev/null 
> 
> We can add the path to backup?

first there is -Q and -q options if you want less output (better than
redirecting to /dev/null so you can still see the error messages)

second to answer your question, you can add path to backup as explained
above:

/usr/bin/dar/ -m 256 -t -s 600M -D -R / -c $PATH_TO_BACKUP/$FILE ...


> 
>[...]

Cheers,
Denis