[CentOS] backup question

[James B. Byrne]

on: Sun Jun 22 08:00:34 UTC 2008, Gergely Buday gbuday at gmail.com wrote:

> Dear CentOs users,
>
> I have a centos server with nothing important at the moment, but I
> would like to install some web-based project management tool (trac for
> the curious) that would contain important data. And, as my network is
> growing the configuration of the server is becoming complex. I would
> like to have a proper backup so that I can restore the whole system
> easily, should any problem occur. What do you recommend?
>
> I'm not an expert on this, so my first idea is that I could do a per
> application backup and create a tar file of the /etc. The latter
> especially could be too naive. And, a push-the-button method that
> handles all in once, not depending on the app number would be much
> better.
>
> Another thing: how I could do this to be safe across a centos upgrade?

I have recently moved from Trac to Redmine for project management (and I
strongly recommend that you consider this as an alternative to Trac, it is
far more powerful to use and much easier to set up) but I had/have exactly
the same problems that you are facing.  The difficulty is that Trac has a
DBMS backend, usually MySQl but in my case PostgreSQl.  This complicates
the issue since it is not enough to simply tar up the application site.

What I ended up doing was building a hot site spare server to accommodate
all of these types of applications (Trac project management, subversion
repositories, drupal user cms sites, imapd user mailboxes, avantfax fax
archives).  Then, for applications that employed a database backend, I
setup regular cron jobs to dump the backend databases into a ./dbdump
directory that I added to the root of each site's file system. I added an
rsync command to the end of the dump command to then move the entire site
to the backup box at the end of the dump.  On the backup machine I added a
cron job to reload the database from the dump.

This entails some background work to set up.  You must initialize and
configure the appropriate DBMS on the backup server with the requisite
databases and database owners. You must ensure that the application's
users and groups are properly replicated there. You may need to install
and configure the application itself. You may need to configure apache if
the application uses a web frontend, like Trac. You need to setup SSL host
to host root authentication for rsync. And there are no doubt several
other little things that need to be accommodated but that I no doubt have
forgotten.

However, what this gives you is a hot site backup that a simple change to
DNS can enable.

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Re: [CentOS] backup question

[Les Mikesell]

admin wrote:
I think so, at least you do the way I use it because you boot the 
machine off the Clonezilla CD, then mount the device/partition you're 
backing up to and select the device/partition being backed up.


But Clonezilla also has a whole network mode of operation involving a 
Clonezilla server, so I can't rule it out ... maybe someone else can?


Any time you do partition/filesystem image backups you have to make sure 
nothing changes until the copy is complete, so you typically need to run 
from CD to back up.  File based backups (tar, cpio, etc.) aren't quite 
as picky although it is still best if nothing changes. You could use 
some tricks like LVM snapshots, but clonezilla doesn't.   The network 
mode lets you boot via PXE instead of the CD and automatically NFS 
mounts the server so you can save and restore from there, but otherwise 
is about the same.


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Re: [CentOS] backup question

[admin]

I think so, at least you do the way I use it because you boot the 
machine off the Clonezilla CD, then mount the device/partition you're 
backing up to and select the device/partition being backed up.


But Clonezilla also has a whole network mode of operation involving a 
Clonezilla server, so I can't rule it out ... maybe someone else can?




Gary Richardson wrote:
Do you need to shut your machine down to use clonezilla? After a quick 
skim of the site, I can't find anything that says you don't.


On Sun, Jun 22, 2008 at 7:27 AM, Les Mikesell <[EMAIL PROTECTED] 
> wrote:


Anne Wilson wrote:



I've had good results using Clonezilla for complete backup
of OS+data.


Is there any compression?  Does it span multiple CDs if necessary?


It does an image copy and knows enough about most filesystems to
only copy the used portions of the disk.  Yes it compresses, no it
doesn't split - or write CD's directly.  It lets you store the image
in a variety of places (network mount via samba, NFS, or ssh), local
disks which could be USB external, etc.).  After the image is
stored, you can use a command line to convert the image to a
bootable DVD image containing clonezilla and the image. But it
doesn't split and you have to use some other utility to burn the
DVD.   It would probably work pretty well to install clonezilla to
boot from a large USB disk where you could store images directly and
restore from them.

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Re: [CentOS] backup question

[Theo Band [GreenPeak]]

Gergely Buday wrote:

Dear CentOs users,

I have a centos server with nothing important at the moment, but I
would like to install some web-based project management tool (trac for
the curious) that would contain important data. And, as my network is
growing the configuration of the server is becoming complex. I would
like to have a proper backup so that I can restore the whole system
easily, should any problem occur. What do you recommend?

I'm not an expert on this, so my first idea is that I could do a per
application backup and create a tar file of the /etc. The latter
especially could be too naive. And, a push-the-button method that
handles all in once, not depending on the app number would be much
better.

Another thing: how I could do this to be safe across a centos upgrade?

  

I use dump (and restore). It works nice for ext3 file systems.
First you do a full dump (level 0) then you do an incremental dump (1 or 
higher):


dumplevel=0
or for incremental
dumplevel=1

# To use ssh to connect to the remote host
export RSH=ssh

# then dump
dump -${dumplevel} -u -z -f remote_host:/sda1_dump /dev/sda1

You have to fill in your device and filename of course

See man dump/restore

Cheers,
Theo

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Re: [CentOS] backup question

[Ned Slider]

Gary Richardson wrote:
Do you need to shut your machine down to use clonezilla? After a quick 
skim of the site, I can't find anything that says you don't.




Yes, Clonezilla is a LiveCD which you boot from to clone the disk so 
your machine will be offline during this process.


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Re: [CentOS] backup question

[Gary Richardson]

Do you need to shut your machine down to use clonezilla? After a quick skim
of the site, I can't find anything that says you don't.

On Sun, Jun 22, 2008 at 7:27 AM, Les Mikesell <[EMAIL PROTECTED]> wrote:

> Anne Wilson wrote:
>
>>
>>
>  I've had good results using Clonezilla for complete backup of OS+data.
>>>
>>
>> Is there any compression?  Does it span multiple CDs if necessary?
>>
>
> It does an image copy and knows enough about most filesystems to only copy
> the used portions of the disk.  Yes it compresses, no it doesn't split - or
> write CD's directly.  It lets you store the image in a variety of places
> (network mount via samba, NFS, or ssh), local disks which could be USB
> external, etc.).  After the image is stored, you can use a command line to
> convert the image to a bootable DVD image containing clonezilla and the
> image. But it doesn't split and you have to use some other utility to burn
> the DVD.   It would probably work pretty well to install clonezilla to boot
> from a large USB disk where you could store images directly and restore from
> them.
>
> --
>  Les Mikesell
>   [EMAIL PROTECTED]
>
>
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Re: [CentOS] backup question

[admin]

Yep, and USB external hard drives are even cheaper per GB.

Here in Australia an 8G USB stick retails for around AU$50, while a 250G 
2.5" external HDD is around AU$140 by comparison (about 1/10 the cost 
per GB).


Anne Wilson wrote:

On Sunday 22 June 2008 15:27:34 Les Mikesell wrote:

Anne Wilson wrote:

I've had good results using Clonezilla for complete backup of OS+data.

Is there any compression?  Does it span multiple CDs if necessary?

It does an image copy and knows enough about most filesystems to only
copy the used portions of the disk.  Yes it compresses, no it doesn't
split - or write CD's directly.  It lets you store the image in a
variety of places (network mount via samba, NFS, or ssh), local disks
which could be USB external, etc.).  After the image is stored, you can
use a command line to convert the image to a bootable DVD image
containing clonezilla and the image. But it doesn't split and you have
to use some other utility to burn the DVD.   It would probably work
pretty well to install clonezilla to boot from a large USB disk where
you could store images directly and restore from them.


With usb sticks becoming so cheap that's a viable option, then.  Thanks

Anne


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Re: [CentOS] backup question

[Anne Wilson]

On Sunday 22 June 2008 15:27:34 Les Mikesell wrote:
> Anne Wilson wrote:
> >> I've had good results using Clonezilla for complete backup of OS+data.
> >
> > Is there any compression?  Does it span multiple CDs if necessary?
>
> It does an image copy and knows enough about most filesystems to only
> copy the used portions of the disk.  Yes it compresses, no it doesn't
> split - or write CD's directly.  It lets you store the image in a
> variety of places (network mount via samba, NFS, or ssh), local disks
> which could be USB external, etc.).  After the image is stored, you can
> use a command line to convert the image to a bootable DVD image
> containing clonezilla and the image. But it doesn't split and you have
> to use some other utility to burn the DVD.   It would probably work
> pretty well to install clonezilla to boot from a large USB disk where
> you could store images directly and restore from them.

With usb sticks becoming so cheap that's a viable option, then.  Thanks

Anne


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Re: [CentOS] backup question

[Les Mikesell]

Anne Wilson wrote:





I've had good results using Clonezilla for complete backup of OS+data.


Is there any compression?  Does it span multiple CDs if necessary?


It does an image copy and knows enough about most filesystems to only 
copy the used portions of the disk.  Yes it compresses, no it doesn't 
split - or write CD's directly.  It lets you store the image in a 
variety of places (network mount via samba, NFS, or ssh), local disks 
which could be USB external, etc.).  After the image is stored, you can 
use a command line to convert the image to a bootable DVD image 
containing clonezilla and the image. But it doesn't split and you have 
to use some other utility to burn the DVD.   It would probably work 
pretty well to install clonezilla to boot from a large USB disk where 
you could store images directly and restore from them.


--
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   [EMAIL PROTECTED]

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Re: [CentOS] backup question

[nightduke]

http://www.rsnapshot.org/

2008/6/22 Anne Wilson <[EMAIL PROTECTED]>:
> On Sunday 22 June 2008 09:37:38 admin wrote:
>> I've had good results using Clonezilla for complete backup of OS+data.
>
> Is there any compression?  Does it span multiple CDs if necessary?
>
> Anne
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Re: [CentOS] backup question

[Anne Wilson]

On Sunday 22 June 2008 09:37:38 admin wrote:
> I've had good results using Clonezilla for complete backup of OS+data.

Is there any compression?  Does it span multiple CDs if necessary?

Anne
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Re: [CentOS] backup question

[admin]

I've had good results using Clonezilla for complete backup of OS+data. 
It backs up entire disks/partitions, so includes everything including 
configuration files, tweaks etc. It is fast compared to something like 
Ghost, and can backup to devices (USB stick or external HDD) or a 
network location. Restores are also fast and have been flawless to date 
(restoring to identical hardware).


If you want to restore an entire system in all its detail in one quick 
operation, something like Clonezilla is worth investigating.


http://www.clonezilla.org/

or Google "Gparted-clonezilla" as many versions of Clonezilla are 
packaged on a Live CD with Gparted.



Gergely Buday wrote:

Dear CentOs users,

I have a centos server with nothing important at the moment, but I
would like to install some web-based project management tool (trac for
the curious) that would contain important data. And, as my network is
growing the configuration of the server is becoming complex. I would
like to have a proper backup so that I can restore the whole system
easily, should any problem occur. What do you recommend?

I'm not an expert on this, so my first idea is that I could do a per
application backup and create a tar file of the /etc. The latter
especially could be too naive. And, a push-the-button method that
handles all in once, not depending on the app number would be much
better.

Another thing: how I could do this to be safe across a centos upgrade?

- Gergely
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[CentOS] backup question

[Gergely Buday]

Dear CentOs users,

I have a centos server with nothing important at the moment, but I
would like to install some web-based project management tool (trac for
the curious) that would contain important data. And, as my network is
growing the configuration of the server is becoming complex. I would
like to have a proper backup so that I can restore the whole system
easily, should any problem occur. What do you recommend?

I'm not an expert on this, so my first idea is that I could do a per
application backup and create a tar file of the /etc. The latter
especially could be too naive. And, a push-the-button method that
handles all in once, not depending on the app number would be much
better.

Another thing: how I could do this to be safe across a centos upgrade?

- Gergely
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Re: [CentOS] Backup Question

[Craig White]

On Sun, 2008-03-16 at 14:15 -0600, Joseph L. Casale wrote:
> We are migrating an LTO2 library off Veritas and NTBackup on a Windows
> Server to a Linux Server with either Bacula or Amanda. Originally, the
> Windows server used scripts to sync changes from various other Windows
> servers using Robocopy to a locally attached set of volumes, then ran
> the backup nightly (Full’s were always done).
> 
>  
> 
> I now had hoped to rsync the Samba shares to a local replica on the
> Linux Server and then start the backup every night after it finishes.
> Would this be the most efficient way to do this, or are there better
> tools for this? I need an additional replica of the data, so using the
> Windows Bacula client doesn’t help, and I must be able to only
> replicate the changes or I’ll miss my backup window based on the
> volume of data.

I think bacula has the ability to execute a script at start and thus you should 
be able to tell the Windows Server to execute the same robocopy script.

Craig

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Re: [CentOS] Backup Question

[Shawn Everett]

After a moment or two of digging:
http://www.bacula.org/en/dev-manual/Tips_Suggestions.html#19274

Run Before Job = ShellScriptShownBelow

Shawn


On Sunday 16 March 2008, Shawn Everett wrote:
> > I can't install cygwin or a daemon for that matter on the Windows
> > Server, but I could execute a scheduled job to run a Widows port of
> > rsync on the file server which I am not opposed to at all. My only
> > problem with that is how do I then trigger the Bacula server to begin
> > the dump to tape once the sync is complete?
>
> Use a batch file and schedule that. :)
>
> @echo off
> del /place/you/sync/to/done.txt
> robocopy/rsync files (whatever)
> echo > /place/you/sync/to/done.txt
>
> Schedule the batch file for say 11:00pm
>
> At some reasonable time schedule a bash script in Linux via cron:
>
> #!/bin/bash
> while test ! -e done.txt; do
>   sleep 1m
> done
> tar -czf /dev/tape /sync/path
>
> Simple. :)  The above script will wait until done.txt exists and then
> backs up the repository.  If you're really lucky Bacula has a post
> backup script that can be run.  I'm rather traditional and use tar. :)
>
> Shawn
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Re: [CentOS] Backup Question

[Shawn Everett]

> I can't install cygwin or a daemon for that matter on the Windows
> Server, but I could execute a scheduled job to run a Widows port of
> rsync on the file server which I am not opposed to at all. My only
> problem with that is how do I then trigger the Bacula server to begin
> the dump to tape once the sync is complete?

Use a batch file and schedule that. :)

@echo off
del /place/you/sync/to/done.txt
robocopy/rsync files (whatever)
echo > /place/you/sync/to/done.txt

Schedule the batch file for say 11:00pm

At some reasonable time schedule a bash script in Linux via cron:

#!/bin/bash
while test ! -e done.txt; do
sleep 1m
done
tar -czf /dev/tape /sync/path

Simple. :)  The above script will wait until done.txt exists and then backs 
up the repository.  If you're really lucky Bacula has a post backup script 
that can be run.  I'm rather traditional and use tar. :)

Shawn
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Re: [CentOS] Backup Question

[Les Mikesell]

Joseph L. Casale wrote:

Rsync directly from the target would be more efficient. I've never been
able to make this work using cygwin sshd on the windows side to accept
the connection and run rsync, but that could be a bug that is fixed now.
  It will work using rsync in daemon mode on the windows side, or
initiating the connection from windows to a Linux target via ssh.

If you don't want the whole cygwin setup on your machines, there is a
minimal install for rsync here:
http://sourceforge.net/project/showfiles.php?group_id=34854


I can't install cygwin or a daemon for that matter on the Windows Server, but I 
could execute a scheduled job to run a Widows port of rsync on the file server 
which I am not opposed to at all. My only problem with that is how do I then 
trigger the Bacula server to begin the dump to tape once the sync is complete?


I think I missed the distinction, but I'd expect it to be best to do the 
initial copy from the system that actually holds the data, and rsync 
will know to copy only the changed parts. If you run it with the source 
on a network drive it will still have to read entire files over the 
network to find the changed blocks.



I need an additional replica of the data, so using the Windows Bacula client

doesn't help,

I thought bacula could be configured to keep both an on-line and tape copy.


Possible, but I wouldn't have time for it to dump all the data if it simply 
accessed the CIFS share to copy all the data.


Why wouldn't you run the agent on the machine holding the data?


and I must be able to only replicate the changes or I'll miss my backup

window based on the volume of data.

I use backuppc to keep an online and easily accessible history and
amanda for tapes that go offsite (and I hope to never have to recover
from the amanda tapes because it is much more difficult) and I just let
them run independently.  If your backup window is tight, you might have
to run both (or bacula) against your rsync-mirrored snapshot instead of
the actual target.  This works well for data files but you'll need some
extra contortions if you expect to do bare metal restores of the windows
targets.


Yea, bare metal is handled elsewhere, I just need file level protection. Not 
sure about Backuppc, it still doesn't help me trigger Bacula as soon as the 
sync is complete.


Does that have to be precisely timed?  I'd just allow for worst-case 
timing before letting the backup server's scheduler start.  Backuppc has 
a 'blackout window' for times you don't want backups running.  With 
amanda you schedule when the runs start.  Bacula probably has something 
similar.


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RE: [CentOS] Backup Question

[Joseph L. Casale]

> Rsync directly from the target would be more efficient. I've never been
> able to make this work using cygwin sshd on the windows side to accept
> the connection and run rsync, but that could be a bug that is fixed now.
>   It will work using rsync in daemon mode on the windows side, or
> initiating the connection from windows to a Linux target via ssh.
>
> If you don't want the whole cygwin setup on your machines, there is a
> minimal install for rsync here:
> http://sourceforge.net/project/showfiles.php?group_id=34854

I can't install cygwin or a daemon for that matter on the Windows Server, but I 
could execute a scheduled job to run a Widows port of rsync on the file server 
which I am not opposed to at all. My only problem with that is how do I then 
trigger the Bacula server to begin the dump to tape once the sync is complete?

> > I need an additional replica of the data, so using the Windows Bacula client
> doesn't help,
>
> I thought bacula could be configured to keep both an on-line and tape copy.

Possible, but I wouldn't have time for it to dump all the data if it simply 
accessed the CIFS share to copy all the data.

> > and I must be able to only replicate the changes or I'll miss my backup
> window based on the volume of data.
>
> I use backuppc to keep an online and easily accessible history and
> amanda for tapes that go offsite (and I hope to never have to recover
> from the amanda tapes because it is much more difficult) and I just let
> them run independently.  If your backup window is tight, you might have
> to run both (or bacula) against your rsync-mirrored snapshot instead of
> the actual target.  This works well for data files but you'll need some
> extra contortions if you expect to do bare metal restores of the windows
> targets.

Yea, bare metal is handled elsewhere, I just need file level protection. Not 
sure about Backuppc, it still doesn't help me trigger Bacula as soon as the 
sync is complete.

Thanks for the help!
jlc
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Re: [CentOS] Backup Question

[Les Mikesell]

Joseph L. Casale wrote:

We are migrating an LTO2 library off Veritas and NTBackup on a Windows Server 
to a Linux Server with either Bacula or Amanda. Originally, the Windows server 
used scripts to sync changes from various other Windows servers using Robocopy 
to a locally attached set of volumes, then ran the backup nightly (Full's were 
always done).


If this sync script runs on the target machine, you could simply change 
it to use cygwin rsync instead with the destination on a linux box.



I now had hoped to rsync the Samba shares to a local replica on the Linux 
Server and then start the backup every night after it finishes.
 Would this be the most efficient way to do this, or are there better 
tools for this?


Rsync directly from the target would be more efficient. I've never been 
able to make this work using cygwin sshd on the windows side to accept 
the connection and run rsync, but that could be a bug that is fixed now. 
 It will work using rsync in daemon mode on the windows side, or 
initiating the connection from windows to a Linux target via ssh.


If you don't want the whole cygwin setup on your machines, there is a 
minimal install for rsync here: 
http://sourceforge.net/project/showfiles.php?group_id=34854



I need an additional replica of the data, so using the Windows Bacula client 
doesn't help,


I thought bacula could be configured to keep both an on-line and tape copy.


and I must be able to only replicate the changes or I'll miss my backup window 
based on the volume of data.


I use backuppc to keep an online and easily accessible history and 
amanda for tapes that go offsite (and I hope to never have to recover 
from the amanda tapes because it is much more difficult) and I just let 
them run independently.  If your backup window is tight, you might have 
to run both (or bacula) against your rsync-mirrored snapshot instead of 
the actual target.  This works well for data files but you'll need some 
extra contortions if you expect to do bare metal restores of the windows 
targets.


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[CentOS] Backup Question

[Joseph L. Casale]

We are migrating an LTO2 library off Veritas and NTBackup on a Windows Server 
to a Linux Server with either Bacula or Amanda. Originally, the Windows server 
used scripts to sync changes from various other Windows servers using Robocopy 
to a locally attached set of volumes, then ran the backup nightly (Full's were 
always done).

I now had hoped to rsync the Samba shares to a local replica on the Linux 
Server and then start the backup every night after it finishes. Would this be 
the most efficient way to do this, or are there better tools for this? I need 
an additional replica of the data, so using the Windows Bacula client doesn't 
help, and I must be able to only replicate the changes or I'll miss my backup 
window based on the volume of data.

Thanks for any suggestions,
jlc

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