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Thread: Inconsistent backup of Zimbra

  1. #1
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    Default Inconsistent backup of Zimbra

    Hi all !

    I am using on of the scripts found in the wiki to backup my Zimbra server.
    I have two servers (one in production and one pn my LAN), both are running Centos 5.4 and Zimbra 6.0.5.
    I used the method described in Open Source Edition Backup Procedure : 1.2 More elaborated script, using LVM and rsync
    I just modified the rsync options, because rsync -aAK complained about ACL errors (I don't understand why this "A" option was there, so I removed it and used -aHK).

    The process is :
    • At 01:00, on production server :
      • Stop zimbra
      • Create Snapshot LV of /opt
      • Start zimbra
      • rsync -aHK /opt-snapshot/zimbra to /opt.bak/zimbra.01h00
      • Remove Snapshot LV (process takes less than 10 minutes)
    • At 02:00, on backup server :


    When I checked my local backup today, it was stopped and could not start :
    Code:
            Starting ldap...Done.
    Failed.
    Failed to start slapd.  Attempting debug start to determine error.
    hdb_db_open: database "": db_open(/opt/zimbra/data/ldap/hdb/db/id2entry.bdb) failed: Invalid argument (22).
    backend_startup_one (type=hdb, suffix=""): bi_db_open failed! (22)
    bdb_db_close: database "": alock_close failed
    So I guess my backup is NOT consistent, even though I stopped zimbra before creating the snapshot.

    Any idea of what went wrong here ?
    As a side note, here is the email I received from the latest cron job (indicating that everything ran fine apparently) :
    Code:
    2010-03-08 01:00:01 zimbra backup: backup started
    2010-03-08 01:00:01 zimbra backup: stopping the Zimbra services, this may take some time
    2010-03-08 01:00:32 zimbra backup: creating a LV called LogVolOptSnapshot
      Logical volume "LogVolOptSnapshot" created
    2010-03-08 01:00:33 zimbra backup: starting the Zimbra services in the background.....
    2010-03-08 01:00:33 zimbra backup: creating mountpoint for the LV
    2010-03-08 01:00:33 zimbra backup: mounting the snapshot LogVolOptSnapshot
    2010-03-08 01:00:33 zimbra backup: rsyncing the snapshot to the backup directory 
    2010-03-08 01:01:28 zimbra backup: unmounting the snapshot
    2010-03-08 01:01:28 zimbra backup: pausing 1s and syncing before removing the snapshot from LVM
    2010-03-08 01:01:30 zimbra backup: removing the snapshot
      Logical volume "LogVolOptSnapshot" successfully removed
    2010-03-08 01:01:31 zimbra backup: backup ended
    2010-03-08 01:03:59 zimbra backup: services background startup completed

    I post the complete scripts below :

    Backup script on production server :
    Code:
    #!/bin/bash
    #
    #    Script to backup a Zimbra installation (open source version)
    #    by installing the Zimbra on a separate LVM Logical Volume,
    #    taking a snapshot of that partition after stopping Zimbra,
    #    restarting Zimbra services, then rsyncing the snapshot to a
    #    separate backup point.
    
    #    This script was originally based on a script found on the Zimbra wiki
    #    http://wiki.zimbra.com/index.php?title=Open_Source_Edition_Backup_Procedure
    #    and totally rewritten since then.
    
    #    Copyright (C) 2007 Serge van Ginderachter <svg@ginsys.be>
    #
    #    This program is free software; you can redistribute it and/or modify
    #    it under the terms of the GNU General Public License version 2 as
    #    published by the Free Software Foundation.
    #
    #    This program is distributed in the hope that it will be useful,
    #    but WITHOUT ANY WARRANTY; without even the implied warranty of
    #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    #    GNU General Public License for more details.
    #
    #    You should have received a copy of the GNU General Public License
    #    along with this program; if not, write to the Free Software
    #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    #    Or download it from http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    
    ####################################################################################
    
    # Read config
    source /root/zmbackup/zmbackup_01h00.config
    
    ##########################################
    # Do not change anything beyond this point
    ##########################################
    
    pause() {
            if [ -n "$debug" ]; then
            echo "Press Enter to execute this step..";
            read input;
            fi
            }
    
    say() {
            MESSAGE_PREFIX="zimbra backup:"
            MESSAGE="$1"
            TIMESTAMP=$(date +"%F %T")
            echo -e "$TIMESTAMP $MESSAGE_PREFIX $MESSAGE"
            logger -t $log_tag -p $log_facility.$log_level "$MESSAGE"
            logger -t $log_tag -p $log_facility_mail.$log_level "$MESSAGE"
            pause
            }
    
    error ()  {
            MESSAGE_PREFIX="zimbra backup:"
            MESSAGE="$1"
            TIMESTAMP=$(date +"%F %T")
            echo -e $TIMESTAMP $MESSAGE >&2
            logger -t $log_tag -p $log_facility.$log_level_err "$MESSAGE"
            logger -t $log_tag -p $log_facility_mail.$log_level_err "$MESSAGE"
            echo $TIMESTAMP $MESSAGE | mail -s "Zimbra Backup - Erreur" arnaud.lesauvage@codata.eu
            exit
            }
    
    # load kernel module to enable LVM snapshots
    /sbin/modprobe dm-snapshot || error "Error loading dm-snapshot module"
    
    # Output date
    say "backup started"
    
    # Stop the Zimbra services
    say "stopping the Zimbra services, this may take some time"
    /etc/init.d/zimbra stop || error "error stopping Zimbra"
    [ "$(ps -u zimbra -o "pid=")" ] && kill -9 $(ps -u zimbra -o "pid=") #added as a workaround to zimbra bug 18653
    
    # Create a logical volume called ZimbraBackup
    say "creating a LV called $zm_snapshot"
    $LVCREATE -L $zm_snapshot_size -s -n $zm_snapshot /dev/$zm_vg/$zm_lv  || error "error creating snapshot, exiting"
    
    # Start the Zimbra services
    say "starting the Zimbra services in the background....."
    (/etc/init.d/zimbra start && say "services background startup completed") || error "services background startup FAILED" &
    
    # Create a mountpoint to mount the logical volume to
    say "creating mountpoint for the LV"
    mkdir -p $zm_snapshot_path || error "error creating snapshot mount point $zm_snapshot_path"
    
    # Mount the logical volume snapshot to the mountpoint
    say "mounting the snapshot $zm_snapshot"
    mount /dev/$zm_vg/$zm_snapshot $zm_snapshot_path
    
    # Create the current backup
    say "rsyncing the snapshot to the backup directory $backup_dir"
    rsync -aHK$V --delete --inplace $zm_snapshot_path/$zm_path/ $zm_backup_path || say "error during rsync but continuing the backup script"
    
    # Unmount $zm_snapshot from $zm_snapshot_mnt
    say "unmounting the snapshot"
    umount $zm_snapshot_path || error "error unmounting snapshot"
    
    # Delete the snapshot mount dir
    rmdir $zm_snapshot_path
    
    # Remove the snapshot volume
    # https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/71567
    say "pausing 1s and syncing before removing the snapshot from LVM"
    sleep 1 ; sync
    say "removing the snapshot"
    $LVREMOVE --force /dev/$zm_vg/$zm_snapshot  || say "error removing the snapshot"
    
    # Done!
    say "backup ended"
    date >$zm_backup_path/lastsync
    Backup Script configuration file (/root/zmbackup/zmbackup_01h00.config) :
    Code:
    #!/bin/bash
    #
    #    Copyright (C) 2007 Serge van Ginderachter <svg@ginsys.be>
    #
    #    This program is free software; you can redistribute it and/or modify
    #    it under the terms of the GNU General Public License version 2 as
    #    published by the Free Software Foundation.
    #
    #    This program is distributed in the hope that it will be useful,
    #    but WITHOUT ANY WARRANTY; without even the implied warranty of
    #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    #    GNU General Public License for more details.
    #
    #    You should have received a copy of the GNU General Public License
    #    along with this program; if not, write to the Free Software
    #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    #    Or download it from http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    
    
    #### Modify the following variables according to your installation
    
    # backup_dir - directory to backup to
    zm_backup_path=/opt.bak/zimbra.01h00/
    
    # zm_lv - the Logical Volume that contains /opt/zimbra - /opt mount point expected
    zm_lv=LogVolOpt
    
    # vol_group - the Volume Group that contains $zm_lv
    zm_vg=VolGroupOpt
    
    # zimbra_path - the path beneath the Logical Volume $zm_lv that needs to be synced
    zm_path=zimbra
    
    # zm_lv_fs - the file system type (ext3, xfs, ...) in /opt/zimbra
    zm_lv_fs=ext3
    
    # lvcreate lvremove - path and command for the lvm logical volume creation and deletion command
    LVCREATE=/usr/sbin/lvcreate
    LVREMOVE=/usr/sbin/lvremove
    
    #### Modify the following variables according to your taste and needs
    
    # zmsnapshot - the snapshot volume name for $zm_lv
    zm_snapshot=LogVolOptSnapshot
    
    # zmsnapshot_size - size avalable for growing the snapshot
    zm_snapshot_size=20GB
    
    # zm_snapshot_mnt - zimbra snapshot mount point
    zm_snapshot_path=/tmp/opt.snapshot
    
    # rsync verbose set to "v"
    # V=v
    V=
    
    #  pause at each step if $debug is set to a non-zero string
    debug=
    
    #### Following parameters probably shouldn't need to be changed
    
    log_facility=daemon
    log_facility_mail=mail
    log_level=notice
    log_level_err=error
    log_tag="$0"
    Local script to sync backup server :
    Code:
    #!/bin/bash
    
    /etc/init.d/zimbra stop
    [ "$(ps -u zimbra -o "pid=")" ] && kill -9 $(ps -u zimbra -o "pid=")
    rsync -avzHK --delete -e "ssh -i <my_private_key>" root@<production_server_ip_address>:/opt.bak/zimbra.01h00/ /opt/zimbra/
    /etc/init.d/zimbra start
    Any help would be greatly appreciated !
    Thanks a lot !

  2. #2
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    NB : I just synced the local backup server with the live "/opt/zimbra" folder, and zimbra started just fine.
    Something must be wrong with the backup script I guess !

  3. #3
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    You may wish to add some debugging around
    Code:
    [ "$(ps -u zimbra -o "pid=")" ] && kill -9 $(ps -u zimbra -o "pid=")
    It is possible that by the time the split occurred some processes were still active. Using -9 to kill still running processes may have zapped a LDAP one. It would be safer to just use kill -SIGHUP. After the zmcontrol stop run a ps that dumps any zimbra processes to a file and see what is happening.

  4. #4
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    Quote Originally Posted by uxbod View Post
    You may wish to add some debugging around
    Code:
    [ "$(ps -u zimbra -o "pid=")" ] && kill -9 $(ps -u zimbra -o "pid=")
    It is possible that by the time the split occurred some processes were still active. Using -9 to kill still running processes may have zapped a LDAP one. It would be safer to just use kill -SIGHUP. After the zmcontrol stop run a ps that dumps any zimbra processes to a file and see what is happening.
    Am I right to asssume that "kill -9" really kills the process whereas kill -SIGHUP sends a stop signal to it ? (sorry I am not very linux savvy)

    Outputting ps to a file is a good idea,
    I'll add "ps -aux > ps_zmcontrol.txt" after the zmcontrol stop AND "ps -aux > ps_kill.txt" after the kill to see what the differences are and whether there are sole suspicious processes still running.

    Thanks for the advice !

  5. #5
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    Still the same error trying to start the backup server this morning !

    Output of ps_zmcontrol.txt looks very clean to me ! I am not surprised though : since I upgraded to 6.0.5, I never had any more process running after a "zmcontrol stop".

    ps_zmcontrol.txt :
    Code:
    USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
    root         1  0.0  0.0   2072   628 ?        Ss   Feb26   0:02 init [3]
    root         2  0.0  0.0      0     0 ?        S<   Feb26   0:00 [migration/0]
    root         3  0.0  0.0      0     0 ?        SN   Feb26   0:00 [ksoftirqd/0]
    root         4  0.0  0.0      0     0 ?        S<   Feb26   0:00 [watchdog/0]
    root         5  0.0  0.0      0     0 ?        S<   Feb26   0:00 [events/0]
    root         6  0.0  0.0      0     0 ?        S<   Feb26   0:00 [khelper]
    root         7  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kthread]
    root        10  0.0  0.0      0     0 ?        S<   Feb26   0:04 [kblockd/0]
    root        11  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kacpid]
    root       137  0.0  0.0      0     0 ?        S<   Feb26   0:00 [cqueue/0]
    root       140  0.0  0.0      0     0 ?        S<   Feb26   0:00 [khubd]
    root       142  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kseriod]
    root       205  0.0  0.0      0     0 ?        S    Feb26   0:23 [pdflush]
    root       206  0.0  0.0      0     0 ?        S    Feb26   0:24 [pdflush]
    root       207  0.0  0.0      0     0 ?        S<   Feb26   0:08 [kswapd0]
    root       208  0.0  0.0      0     0 ?        S<   Feb26   0:00 [aio/0]
    root       363  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kpsmoused]
    root       388  0.0  0.0      0     0 ?        S<   Feb26   0:00 [ata/0]
    root       389  0.0  0.0      0     0 ?        S<   Feb26   0:00 [ata_aux]
    root       392  0.0  0.0      0     0 ?        S<   Feb26   0:00 [scsi_eh_0]
    root       393  0.0  0.0      0     0 ?        S<   Feb26   0:00 [scsi_eh_1]
    root       394  0.0  0.0      0     0 ?        S<   Feb26   0:00 [scsi_eh_2]
    root       395  0.0  0.0      0     0 ?        S<   Feb26   0:00 [scsi_eh_3]
    root       398  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kstriped]
    root       407  0.0  0.0      0     0 ?        S<   Feb26   0:00 [ksnapd]
    root       418  1.5  0.0      0     0 ?        S<   Feb26 251:48 [md2_raid1]
    root       421  0.0  0.0      0     0 ?        S<   Feb26   0:28 [md1_raid1]
    root       424  0.0  0.0      0     0 ?        S<   Feb26   3:52 [md0_raid1]
    root       425  0.0  0.0      0     0 ?        S<   Feb26   1:00 [kjournald]
    root       446  0.0  0.0      0     0 ?        S<   Feb26   0:01 [kauditd]
    root       474  0.0  0.0   2276   672 ?        S<s  Feb26   0:00 /sbin/udevd -d
    root       738  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kedac]
    root      1322  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kmpathd/0]
    root      1323  0.0  0.0      0     0 ?        S<   Feb26   0:00 [kmpath_handlerd]
    root      1355  0.0  0.0      0     0 ?        S<   Feb26   1:07 [kjournald]
    root      1495  0.0  0.0      0     0 ?        S<   Feb26   0:34 [kondemand/0]
    root      1659  0.0  0.0  12548   812 ?        S<sl Feb26   0:39 auditd
    root      1661  0.0  0.0  13108   776 ?        S<sl Feb26   0:08 /sbin/audispd
    root      1681  0.0  0.0   1728   580 ?        Ss   Feb26   1:32 syslogd -m 0
    root      1684  0.0  0.0   1680   392 ?        Ss   Feb26   0:00 klogd -x
    named     1724  0.0  0.1  42828  6432 ?        Ssl  Feb26   5:30 /usr/sbin/named -u named -t /var/named/chroot
    rpc       1772  0.0  0.0   1816   548 ?        Ss   Feb26   0:00 portmap
    root      1797  0.0  0.0      0     0 ?        S<   Feb26   0:00 [rpciod/0]
    root      1803  0.0  0.0   1868   740 ?        Ss   Feb26   0:00 rpc.statd
    root      1840  0.0  0.0   1964   396 ?        Ss   Feb26   0:00 mdadm --monitor --scan -f --pid-file=/var/run/mdadm/mdadm.pid
    root      1858  0.0  0.0   5520   580 ?        Ss   Feb26   0:00 rpc.idmapd
    dbus      1871  0.0  0.0   2756   924 ?        Ss   Feb26   0:00 dbus-daemon --system
    root      1904  0.0  0.0  12736  1268 ?        Ssl  Feb26   0:04 pcscd
    root      1913  0.0  0.0   1676   532 ?        Ss   Feb26   0:00 /usr/sbin/acpid
    68        1924  0.0  0.1   5664  3768 ?        Ss   Feb26   0:01 hald
    root      1925  0.0  0.0   3164   988 ?        S    Feb26   0:00 hald-runner
    68        1933  0.0  0.0   2020   812 ?        S    Feb26   0:00 hald-addon-acpi: listening on acpid socket /var/run/acpid.socket
    root      1941  0.0  0.0   1976   636 ?        S    Feb26   1:36 hald-addon-storage: polling /dev/hda
    root      1970  0.0  0.0  27248  1364 ?        Ssl  Feb26   0:00 automount
    root      1989  0.0  0.0   7076  1068 ?        Ss   Feb26   0:12 /usr/sbin/sshd
    root      2000  0.0  0.0   1908   368 ?        Ss   Feb26   0:00 gpm -m /dev/input/mice -t exps2
    root      2008  0.0  0.0   3248  1104 ?        Ss   Feb26   0:02 crond
    root      2023  0.0  0.0   2276   428 ?        Ss   Feb26   0:00 /usr/sbin/atd
    avahi     2039  0.0  0.0   2600  1356 ?        Ss   Feb26   0:03 avahi-daemon: running [serveurmail01.local]
    avahi     2040  0.0  0.0   2600   320 ?        Ss   Feb26   0:00 avahi-daemon: chroot helper
    root      2052  0.0  0.0   3516   528 ?        S    Feb26   0:00 /usr/sbin/smartd -q never
    root      2104  0.0  0.2  23760 10588 ?        SN   Feb26   0:01 /usr/bin/python -tt /usr/sbin/yum-updatesd
    root      2118  0.0  0.0   2564  1124 ?        SN   Feb26   0:04 /usr/libexec/gam_server
    root      9421  0.0  0.0   1664   424 tty1     Ss+  Feb26   0:00 /sbin/mingetty tty1
    root      9422  0.0  0.0   1664   420 tty2     Ss+  Feb26   0:00 /sbin/mingetty tty2
    root      9423  0.0  0.0   1664   424 tty3     Ss+  Feb26   0:00 /sbin/mingetty tty3
    root      9427  0.0  0.0   1664   424 tty4     Ss+  Feb26   0:00 /sbin/mingetty tty4
    root      9429  0.0  0.0   1664   420 tty5     Ss+  Feb26   0:00 /sbin/mingetty tty5
    root      9430  0.0  0.0   1664   420 tty6     Ss+  Feb26   0:00 /sbin/mingetty tty6
    ntp      10876  0.0  0.1   4400  4396 ?        SLs  Mar02   0:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g
    root     13036  0.0  0.0      0     0 ?        S<   Mar02   0:11 [kjournald]
    root     15030  0.0  0.0   3800  1468 ?        S    01:00   0:00 crond
    root     15042  0.0  0.0   2416   948 ?        Ss   01:00   0:00 /bin/bash /root/zmbackup/zmbackup_01h00.sh
    smmsp    15074  0.0  0.0   8144  2888 ?        S    01:00   0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
    root     16131  0.0  0.0   2184   820 ?        R    01:00   0:00 ps -aux
    root     30127  0.0  0.1   5356  5348 ?        S<s  Feb26   0:00 [dmeventd]
    Isn't it something with the options I use for rsync ? Like symlinks or hardlinks not going where they should ?

    I am quite sure that restoring from the backup works. What seems to fail is restoring the backup on another server.
    Weird thing is that restoring the backup from the live /opt/zimbra/ folder works perfectly.
    Paradoxical to have a consistent backup from the live folder and an inconsistent one from the "snapshot" folder, right ?

  6. #6
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    My problem is very similar to http://www.zimbra.com/forums/adminis...re-backup.html

    The suggested fix does not work for me though (db_recover on /opt/zimbra/data/ldap/hdb/db/).
    db_recover finds and fixes errors, but trying to start zimbra still gives me the same error.

  7. #7
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    This may sound irrelevant, but what are the hostnames of both machines?

  8. #8
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    Same hostname on both machines.
    They both have a Split DNS configuration that allows them to have the exact same Zimbra configuration. They just have different IP addresses because they are on different networks.

    That's a very convenient way to have a backup server always ready.
    If the production server fails for whatever reason, I just have to change the IP address of my backup server (in resolv.conf, /etc/hosts and in BIND), remove the failed server and plug the backup one in...
    Well, at least that would work if the backup did not fail !

  9. #9
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    Well, things were not OK after all.

    I decided to remove all the LVM snapshot stuff. As I said before, downtime is less than 5 minutes without the snapshot, so that is fine.

    I changed kill -9 for kill -15.
    Right after that, I added "sleep 30 ; sync"
    Then I rsync.
    Command is :
    rsync -aHK --delete --exclude='*.pid' --link-dest=/opt.bak/zimbra.current/ /opt/zimbra/ /opt.bak/zimbra.$date/
    Then I do :
    rm -f /opt.bak/zimbra.current/
    ln -s /opt.bak/zimbra.$date/ /opt.bak/zimbra.current

    /opt.bak and /opt are on a different LV, I don't know if this matters.

    Then stop the zimbra on the local backup server and I rsync the /opt.bak/zimbra.current/ directory to my local backup server :
    rsync -aHK --delete root@myserver:/opt.bak/zimbra.current/ /opt/zimbra/

    I restart zimbra and get the dreaded error :
    Starting ldap...Done.
    Failed.
    Failed to start slapd. Attempting debug start to determine error.

    hdb_db_open: database "": db_open(/opt/zimbra/data/ldap/hdb/db/id2entry.bdb) failed: Invalid argument (22).
    backend_startup_one (type=hdb, suffix=""): bi_db_open failed! (22)
    bdb_db_close: database "": alock_close failed

    Now, what really puzzles me :
    This file (/opt/zimbra/data/ldap/hdb/db/id2entry.bdb) has not change for more than 1 hour !
    It has the same modification time in my backup and in the /opt/zimbra folder.
    The backup was done almost an hour after this modification time !

    I really don't get it here...
    Do these clarifications give an idea to someone ?

    Thanks in advance !

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    By Rick Baker in forum Installation
    Replies: 8
    Last Post: 01-17-2006, 03:33 PM

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