Image-basierte Installationen

Die Erweiterung opsi-clonezilla nutzt die Software Clonezilla (klont ganze Rechnersysteme und erstellt Abbilder von Festplatten), um eine flexible Lösung zum Umgang mit Partitions- und Platten-Images zu bieten.

Voraussetzungen

Technische Voraussetzungen sind opsi 4.0.3 mit den Paketständen:

Tabelle 1. Benötigte Pakete
opsi-Paket	Version
opsi-linux-bootimage	>= 20130207-1

bzw. opsi 4.0.5 mit den Paketständen:

Tabelle 2. Benötigte Pakete
opsi-Paket	Version
opsi-linux-bootimage	>= 20140805-1
opsi-clonezilla	>= 4.0.5-1

Für das Produk opsi-clonezilla muss der share opsi_images für 'pcpatch' beschreibbar sein. Prüfen Sie Ihre Samba Konfiguration.
Unterstützung für UEFI Maschinen erst ab opsi 4.0.7
Stellen Sie das Property imageshare auf einen share, welcher vom user pcpatch mit dem dem opsi-server bekannten Passwort gemountet werden kann. Das Format für den share ist dabei //server/share (Beachten Sie die Verwendung von slashs statt backslashs). Dieser share ist üblicherweise der share opsi_images des opsi servers.

Einführung

Neben der Paketbasierten (unattended) installation hatte opsi in der Vergangenheit nur eine rudimentäre Unterstützung für Image basierte Installationen. Mit der Integration der Technik des Open Source Produktes clonezilla stellen wir nun eine umfangreiche und flexible Lösung zum Umgang mit Partitions- und Plattenimages vor.

Konzept

Wir haben die clonezilla scripte mit dem opsi-linux-bootimage kombiniert. Dadurch ergeben sich folgende Vorteile:

Integration in die Steuerung durch opsi
Automatischer mount des shares zur Ablage der images
Möglichkeit der Automatisierung der Abläufe

Interaktive Abläufe

Per default läuft opsi-clonezilla im interaktiven Modus. Dieser erlaubt es einfach und bequem die Parameter für einzelne Aktionen zu bestimmen und kann aber auch als Basis für die Automatisierung dienen.

Stellen Sie das Property runcommand auf ocs-live. Dies ist der Interaktive Modus von clonezilla.
Starten Sie das Netbootprodukt.
In der ersten Maske werden Sie gefragt ob nach /home/partimg etwas gemountet werden soll. Wählen Sie Skip da dies vom bootimage schon erledigt worden ist.

Abbildung 1. Skip: Der über das Property 'imageshare’angegebene Ziel- / Quell-share wird vom opsi-bootimage nach /home/partimg gemountet.

Die gemounteten Partitionen werden angezeigt:

Abbildung 2. Gemountete Partitionen.

In der Abfrage Expert oder Beginner bestimmen Sie ob Sie im folgenden die Defaultparameter ungefragt übernehmen (Beginner) oder diese abändern können (Expert).

Ab opsi 4.0.5 können Sie auch den Beginner Modus wählen.

Abbildung 3. Experte oder lieber einfach ?

Nun können Sie wählen welche Operation Sie durchführen wollen. Hier werden die folgenden Operationen behandelt:

save disk
save partition
restore disk
restore partition

Abbildung 4. Operation wählen.

Interaktives savedisk im expert mode

Hier beispielhaft anhand der savedisk Operation die zusätzlichen Masken des Expertmodes.

Abbildung 5. Wahl der Werkzeuge (den default nutzen)

Abbildung 6. Durchmischtes: Hier -c abwählen um für die automation zusätzliche Rückfragen zu vermeiden.

Abbildung 7. Kompressionsmethode vor opsi 4.0.5 also bei bootimages ⇐ 20130207 (opsi-clonezilla_2.01-3) hier -z1 wählen. Ab opsi 4.0.5 ist dies nicht mehr nötig.

Abbildung 8. Check filesystem (den default 'skip' nutzen)

Abbildung 9. Check the saved image (den default 'yes' nutzen)

Abbildung 10. Action after cloning (den default '-p true' nutzen, der reboot wird vom opsi bootimage ausgelöst.)

Interaktives savedisk

Abbildung 11. Name unter dem das image der disk abgespeichert werden soll.

Abbildung 12. Wahl der disk von welcher das image erzeugt werden soll

Abbildung 13. Das resultierende Kommando. Dieses kann auch im Produktproperty 'runcommand' verwendet werden

Abbildung 14. Fortschrittsanzeige

Interaktives savepart

Abbildung 15. Name unter dem das image der partition abgespeichert werden soll.

Abbildung 16. Wahl der partition von welcher das image erzeugt werden soll

Abbildung 17. Das resultierende Kommando. Dieses kann auch im Produktproperty 'runcommand' verwendet werden

Abbildung 18. Fortschrittsanzeige

Interaktives restoredisk

Abbildung 19. Wahl des diskimage welches restored werden soll

Abbildung 20. Wahl der disk auf die das image restored werden soll

Abbildung 21. Das resultierende Kommando. Dieses kann auch im Produktproperty 'runcommand' verwendet werden

Abbildung 22. Rückfrage vor dem Beginn des Überschreibens der disk. Kann durch entfernen der Option -c aus dem Kommando unterdrückt werden

Abbildung 23. Fortschrittsanzeige

Interaktives restorepart

Abbildung 24. Wahl des partimage welches restored werden soll

Abbildung 25. Wahl der partition auf die das image restored werden soll

Abbildung 26. Das resultierende Kommando. Dieses kann auch im Produktproperty 'runcommand' verwendet werden

Abbildung 27. Rückfrage vor dem Beginn des Überschreibens der disk. Kann durch Entfernen der Option -c aus dem Kommando unterdrückt werden.

Abbildung 28. Fortschrittsanzeige

Nichtinteraktive Abläufe

Durch Angabe des entsprechenden Kommandos im Property runcommand wird opsi-clonezilla in den nichtinteraktiven Modus versetzt.

Stellen Sie das Property imageshare auf einen share, welcher vom user pcpatch mit dem, dem opsi-server bekannten Passwort gemountet werden kann. Das Format für den share ist dabei //server/share (Beachten Sie die Verwendung von slashs statt backslashs).
Stellen Sie das Property runcommand auf ein entsprechendes nicht-interaktives Kommando. Dabei empfohlene Schalter:
- Immer: '--batch'
- Beim Restore: '--skip-check-restorable-r'
- Weglassen: '-c'

Beispiele aus den bisher gezeigten Vorgängen (ohne -c und mit --batch). Ab opsi 4.0.5 können Sie den Parameter -z1 weglassen. Dies beschleunigt die Kompression bei mehreren Prozessor-Kernen:

/opt/drbl/sbin/ocs-sr --batch -q2 -j2 -rm-win-swap-hib -z1 -i 2000 -p true savedisk 2014-06-11-12-img sda
/opt/drbl/sbin/ocs-sr --batch -q2 -j2 -rm-win-swap-hib -z1 -i 2000 -p true saveparts partimg sda1
/opt/drbl/sbin/ocs-sr --batch -g auto -e1 auto -e2 -r -j2 -p true restoredisk 2014-06-11-12-img sda
/opt/drbl/sbin/ocs-sr --batch -g auto -e1 auto -e2 -r -j2 -k -p true restoreparts partimg sda1

Wenn man nun bei diesen Beispielen die imagenamen 2014-06-11-12-img bzw. partimg durch den String 'imagefile' ersetzt, so wird dieser String jeweils durch den Wert des Properties imagefile ersetzt.

Wenn man nun bei diesen Beispielen die Devicenamen sda bzw. sda1 durch den string 'diskdevice' bzw. 'partdevice' ersetzt, so wird dieser String jeweils durch einen für diese Maschine korrekten Wert gemäß der der Properties disk_number bzw. 'part_number' ersetzt.
Beispiele für disk_number=1 und part_number=1:
sda / sda1
cciss/c0d0 / cciss/c0d0p1

Daraus ergeben sich dann folgende Beispiele:

ocs-sr -g auto -e1 auto -e2 --skip-check-restorable-r --batch -r -j2 -p true restoredisk imagefile diskdevice
ocs-sr -q2 --batch -j2 -rm-win-swap-hib -i 2000 -p true savedisk imagefile diskdevice
ocs-sr -q2 -c -j2 -z1 -i 2000 -sc -p true saveparts imagefile partdevice

opsi-clonezilla properties

askbeforeinst
- description: Should there be a confirmation dialog before start installing ? / Faut-il y avoir une confirmation avant de démarrer l’installation ?
- default: False
mount_image_share
- description: Should there be a confirmation dialog before start installing ? / Faut-il y avoir une confirmation avant de démarrer l’installation ?
- default: True
imageshare
- editable: True
- description: normally auto or empty: Defaults to the opsi_images share of the depot server; if not auto or empty: smb/cifs share in the format //server/share
- values: ["", "//opsiserver/opsi_images", "auto"]
- default: ["auto"]
runcommand
- editable: True
- description: Clonezilla command to be executed
- values: ["", "ocs-live", "ocs-sr -g auto -e1 auto -e2 --skip-check-restorable-r --batch -r -j2 -p true restoredisk imagefile diskdevice", "ocs-sr -q2 --skip-check-restorable-s --batch -j2 -rm-win-swap-hib -i 2000 -p true savedisk imagefile diskdevice", "ocs-sr -q2 -c -j2 -z1 -i 2000 -sc -p true saveparts imagefile partdevice"]
- default: ["ocs-live"]
disk_number
- editable: True
- description: Number (first=1) of the disk ; if string 'diskdevice' in the runcommand it will be replaced by valid device path (eg sda)
- values: ["1", "2"]
- default: ["1"]
part_number
- editable: True
- description: Number (first=1) of the partition of 'disk_number' ; if string 'partdevice' in the runcommand it will be replaced by valid device path (eg sda1)
- values: ["1", "2", "3", "4", "5"]
- default: ["1"]
imagefile
- editable: True
- description: name of the imagefile ; will replace the string 'imagefile' in the runcommand
- values: ["myimagefile"]
- default: ["myimagefile"]
drbl_ocs_conf
- editable: True
- description: Directory for post run scripts (Entries in /etc/drbl/drbl-ocs.conf)
- values: ["", "OCS_POSTRUN_DIR=\"/home/partimag/postrun\"", "OCS_PRERUN_DIR=\"/home/partimag/prerun\""]
rebootflag
- editable: False
- description: Should the Client reboot after running the script
- values: ["keepalive", "reboot", "shutdown"]
- default: ["reboot"]
setup_after_install
- multivalue: True
- editable: True
- description: Which opsi product(s) should we switch to setup after clonezilla work is finished ?
- values: [""]
- default: [""]
architecture
- editable: False
- description: Architektur Auswahl, beeinflusst die Auswahl des bootimages und die Installationsarchitektur.
- values: ["32bit", "64bit"]
- default: ["32bit"]

opsi-clonezilla known bugs

Keine

Clonezilla Kommando Referenz

Sichern oder Wiederherstellen von Images

Clonezilla live doc

Clonezilla ocs-sr options

/usr/sbin/ocs-sr:
Usage:
To save or restore image
ocs-sr [OPTION] {savedisk|saveparts|restoredisk|restoreparts} IMAGE_NAME DEVICE

Options for saving:

-enc, --enc-ocs-img: To encrypt the image with passphrase.
-fsck-src-part, --fsck-src-part: Run fsck interactively on the source file system before saving it.
-fsck-src-part-y, --fsck-src-part-y: Run fsck automatically on the source file system before saving it. This option will always attempt to fix any detected filesystem corruption automatically. //NOTE// Use this option in caution.
-gm, --gen-md5sum: Generate the MD5 checksum for the image. Later you can use -cm|--check-md5sum option to check the image when restoring the image. Note! It might take a lot of time to generate if the image size is large.
-gs, --gen-sha1sum: Generate the SHA1 checksum for the image. Later you can use -cs|--check-sha1sum option to check the image when restoring the image. Note! It might take a lot of time to generate if the image size is large.
-gmf, --gen-chksum-for-files-in-dev: Generate the checksum for files in the source device. Later you can use -cmf|--chk-chksum-for-files-in-dev to check the files in the destination device after they are restored. Note! It might take a lot of time to inspect the checksum if there are many files in the destination device.
-i, --image-size SIZE: Set the size in MB to split the partition image file into multiple volumes files. For the FAT32 image repository, the SIZE should not be larger than 4096.
-j2, --clone-hidden-data: Use dd to clone the image of the data between MBR (1st sector, i.e. 512 bytes) and 1st partition, which might be useful for some recovery tool.
-ntfs-ok, --ntfs-ok: Assume the NTFS integrity is OK, do NOT check again (for ntfsclone only)
-rm-win-swap-hib, --rm-win-swap-hib: Try to remove the MS windows swap file in the source partition.
-q, --use-ntfsclone: If the partition to be saved is NTFS, use program ntfsclone instead of partimage (i.e. Priority: ntfsclone > partimage > dd)
-q1, --force-to-use-dd: Force to use dd to save partition(s) (inefficient method, very slow, but works for all the file system).
-q2, --use-partclone: Use partclone to save partition(s) (i.e. partclone > partimage > dd).
-rescue, --rescue: Turn on rescue mode, i.e. try to skip bad sectors.
-sc, -scs, --skip-check-restorable, --skip-check-restorable-s: By default Clonezilla will check the image if restorable after it is created. This option allows you to skip that.
-z0, --no-compress: Don’t compress when saving: very fast but very big image file (NOT compatible with multicast restoring!!!)
-z1, --gzip-compress: Compress using gzip when saving: fast and small image file (default)
-z1p, --smp-gzip-compress: Compress using parallel gzip program (pigz) when saving: fast and small image file, good for multi-core or multi-CPU machine
-z2, --bz2-compress: Compress using bzip2 when saving: slow but smallest image file
-z2p, --smp-bzip2-compress: Compress using parallel bzip2 program (lbzip2) when saving: faster and smallest image file, good for multi-core or multi-CPU machine
-z3, --lzo-compress: Compress using lzop when saving: similar to the size by gzip, but faster than gzip.
-z4, --lzma-compress: Compress using lzma when saving: slow but smallest image file, faster decompression than bzip2.
-z5, --xz-compress: Compress using xz when saving: slow but smallest image file, faster decompression than bzip2.
-z5p, --smp-xz-compress: Compress using parallel xz when saving: slow but smallest image file, faster decompression than bzip2.
-z6, --lzip-compress: Compress using lzip when saving: slow but smallest image file, faster decompression than bzip2.
-z6p, --smp-lzip-compress: Compress using parallel lzip when saving: slow but smallest image file, faster decompression than bzip2.
-z7, --lrzip-compress: Compress using lrzip when saving.
-i, --image-size SIZE: Set the split image file volume size SIZE (MB). When ocs-sr is run with -x, the default SIZE is set as 4096, if without -x, we will not split it. Some words are reserved for IMAGE_NAME, "ask_user" is used to let user to input a name when saving an image. "autoname" is used to automatically generate the image name based on network card MAC address and time. "autohostname" is used to automatically generate the image name based on hostname. "autoproductname" is used to automatically generate the image name based on hardware product model gotten from dmidecode. A word is reserved for DEVICE, "ask_user" could be used to let user to select the source device when saving an image.

Options for restoring:

-f, --from-part-in-img PARTITION: Restore the partition from image. This is especially for "restoreparts" to restore the image of partition (only works for one) to different partition, e.g. sda1 of image to sdb6.
-g, --grub-install GRUB_PARTITION: Install grub in the MBR of the disk containing partition GRUB_PARTITION with root grub directory in the same GRUB_PARTITION when restoration finishs, GRUB_PARTITION can be one of "/dev/hda1", "/dev/hda2"… or "auto" ("auto" will let clonezilla detect the grub root partition automatically). If "auto" is assigned, it will work if grub partition and root partition are not in the same partition.
-r, --resize-partition: Resize the partition when restoration finishes, this will resize the file system size to fit the partition size. It is normally used when when a small partition image is restored to a larger partition.
-k, --no-fdisk, --no-create-partition: Do NOT create partition in target harddisk. If this option is set, you must make sure there is an existing partition table in the current restored harddisk. Default is to create the partition table.
-icrc, --icrc: Skip Partclone CRC checking.
-irhr, --irhr: Skip removing the Linux udev hardware records on the restored GNU/Linux.
-irvd, --irvd: Skip removing the NTFS volume dirty flag after the file system is restored.
-ius, --ius: Skip updating syslinux-related files on the restored GNU/Linux.
-icds, --ignore-chk-dsk-size-pt: Skip checking destination disk size before creating the partition table on it. By default it will be checked and if the size is smaller than the source disk, quit.
iefi, --ignore-update-efi-nvram: Skip updating boot entries in EFI NVRAM after restoring.
-k1,: Create partition table in the target disk proportionally.
-k2,: Enter command line prompt to create partition table manually before restoring image.
-scr, --skip-check-restorable-r: By default Clonezilla will check the image if restorable before restoring. This option allows you to skip that.
-t, --no-restore-mbr: Do NOT restore the MBR (Mater Boot Record) when restoring image. If this option is set, you must make sure there is an existing MBR in the current restored harddisk. Default is Yes
-u, --select-img-in-client: Input the image name in clients
-e, --load-geometry: Force to use the saved CHS (cylinders, heads, sectors) when using sfdisk
-e1, --change-geometry NTFS-BOOT-PARTITION: Force to change the CHS (cylinders, heads, sectors) value of NTFS boot partitoin after image is restored. NTFS-BOOT-PARTITION can be one of "/dev/hda1", "/dev/hda2"… or "auto" ("auto" will let clonezilla detect the NTFS boot partition automatically)
-e2, --load-geometry-from-edd: Force to use the CHS (cylinders, heads, sectors) from EDD (Enhanced Disk Device) when creating partition table by sfdisk
-y, -y0, --always-restore, --always-restore-default-local: Let Clonezilla server as restore server, i.e. client will always has restore mode to choose (However default mode in PXE menu is local boot)
-y1, --always-restore-default-clone: Let Clonezilla server as restore server, i.e. client will always has restore mode to choose (The default mode in PXE menu is clone, so if client boots, it will enter clone always, i.e. clone forever)
-j, --create-part-by-sfdisk: Use sfdisk to create partition table instead of using dd to dump the partition table from saved image (This is default)
-j0, --create-part-by-dd: Use dd to dump the partition table from saved image instead of sfdisk. ///Note/// This does NOT work when logical drives exist.
-j1, --dump-mbr-in-the-end: Use dd to dump the MBR (total 512 bytes, i.e. 446 bytes (executable code area) + 64 bytes (table of primary partitions) + 2 bytes (MBR signature; # 0xAA55) = 512 bytes) after disk image was restored. This is an insurance for some hard drive has different numbers of cylinder, head and sector between image was saved and restored.
-j2, --clone-hidden-data: Use dd to clone the image of the data between MBR (1st sector, i.e. 512 bytes) and 1st partition, which might be useful for some recovery tool.
-hn0 PREFIX: Change the hostname of M$ Windows based on the combination of hostname prefix and IP address, i.e. PREFIX-IP
-hn1 PREFIX: Change the hostname of M$ Windows based on the combination of hostname prefix and NIC MAC address, i.e. PREFIX-MAC
--max-time-to-wait TIME: When not enough clients have connected (but at least one), start anyways when TIME seconds since first client connection have pased. This option is used with --clients-to-wait
-cm, --check-md5sum: Check the MD5 checksum for the image. To use this option, you must enable -gm|--gen-md5sum option when the image is saved. Note! It might take a lot of time to check if the image size is large.
-cs, --check-sha1sum: Check the SHA1 checksum for the image. To use this option, you must enable -gs|--gen-sha1sum option when the image is saved. Note! It might take a lot of time to check if the image size is large.
-cmf, --chk-chksum-for-files-in-dev: Check the checksum for the files in the device. To use this option, you must enable -gmf|--gen-chksum-for-files-in-dev when the image is saved. Note! (1) The file system must be supported by Linux kernel so that it can be mounted as read-only to check the files. (2) It might take a lot of time to check if there are many files in the source device.
-srel, --save-restore-error-log: Save the error log file in the image dir. By default the log file won’t be saved when error occurs.
--mcast-port NO: Assign the udp port number for multicast restore. This is used by clonezilla server. Normally it’s not necessary to manually assign this option. Some words are reserved for IMAGE_NAME, "ask_user" is used to let user to input a name when saving an image. "autoproductname" is used to automatically get the image name based on hardware product model from dmidecode. A word is reserved for DEVICE, "ask_user" could be used to let user to select the source device when saving an image.

General options:

l, --language INDEX: Set the language to be shown by index number: [0|en_US.UTF-8]: English, [1|zh_TW.BIG5]: Traditional Chinese (Big5) - Taiwan, [2|zh_TW.UTF-8]: Traditional Chinese (UTF-8, Unicode) - Taiwan [a|ask]: Prompt to ask the language index
-b, -batch, --batch: (DANGEROUS!) Run program in batch mode, i.e. without any prompt or wait for pressing enter key. //NOTE// You have to use '-batch' instead of '-b' when you want to use it in the boot parameters. Otherwise the program init on system will honor '-b', too.
-c, --confirm: Wait for confirmation before saving or restoring
-d, --debug-mode: Enter command mode to debug before saving/restoring
--debug=LEVEL: Output the partimage debug log in directory /var/log/ with debug LEVEL (0,1,2… default=0)
-m, --module MODULE: Force to load kernel module MODULE, this is useful when some SCSI device is not detected. NOTE! Use only one module, more than one may cause parsing problem.
-o0, --run-prerun-dir: Run the script in the direcoty /usr/share/drbl/postrun/ocs/ before clone is started. The command will be run before MBR is created or saved.
-o1, -o, --run-postrun-dir: Run the script in the direcoty /usr/share/drbl/postrun/ocs/ when clone is finished. The command will be run before that assigned in -p or --postaction.
-w, --wait-time TIME: Wait for TIME secs before saving/restoring
-nogui, --nogui: Do not show GUI (TUI) of Partclone or Partimage, use text only
-a, --no-force-dma-on: Do not force to turn on HD DMA
-mp, --mount-point MOUNT_POINT: Use NFS to mount MOUNT_POINT as directory ocsroot (ocsroot is assigned in drbl.conf)
-or, --ocsroot DIR: Specify DIR (absolute path) as directory ocsroot (i.e. overwrite the ocsroot assigned in drbl.conf)
-p, --postaction [choose|poweroff|reboot|command|CMD]: When save/restoration finishs, choose action in the client, poweroff, reboot (default), in command prompt or run CMD
-ns, --ntfs-progress-in-image-dir: Save the ntfsclone progress tmp file in the image dir so that if cloning is in DRBL client, the progress can be check in the server (Default in to be put in local /tmp/, which is local tmpfs).
-um, --user-mode [beginner|expert]: Specify the mode to use. If not specified, default mode is for a beginner.
-v, --verbose: Prints verbose information
-d0, --dialog: Use dialog
-d1, --Xdialog: Use Xdialog
-d2, --whiptail: Use whiptail
-d3, --gdialog: Use gdialog
-d4, --kdialog: Use kdialog
-x, --interactive: Interactive mode to save or restore.

Example:

To save or restore image in client (Only that DRBL client will join, and its local partitions is NOT mounted). NOTE!!! You should run the command in DRBL client or you have to make sure the target device is NOT busy!. To save all the data in local first IDE harddrive 'hda' as image 'IMAGE1', use ntfsclone instead of partimage, and lzop compression (NOTE!!! You should run the command in DRBL client or make sure hda is NOT busy/mounted!): ocs-sr --use-ntfsclone -z3 savedisk IMAGE1 hda
To save the data in first and second partitions in local first IDE harddrive 'hda' as image 'IMAGE2', use ntfsclone instead of partimage, and lzop compression (NOTE!!! You should run the command in DRBL client, or make sure hda is NOT busy/mounted!): ocs-sr --use-ntfsclone -z3 saveparts IMAGE2 "hda1 hda2"
To restore image IMAGE1 to local hda. grub-install will be run after cloning (image IMAGE1 is already in DRBL server. NOTE!!! You should run the command in DRBL client or make sure hda is NOT busy/mounted!): ocs-sr -g auto restoredisk IMAGE1 hda
To restore image first and second partitions from IMAGE2 to local hda1 and hda2. grub-install will be run after cloning (image IMAGE2 is already in DRBL server. NOTE!!! You should run the command in DRBL client or make sure hda is NOT busy/mounted!): ocs-sr -g auto restoreparts IMAGE2 "hda1 hda2"
To save disk(s)/partitition(s) as an image or restore an image to disk(s)/partitition(s) interactively, use: ocs-sr -x

disk-to-disk Operation

DRBL management: Clone disk or partition on-the-fly

Clone disk or partition on-the-fly

The "ocs-onthefly" is used to do disk to disk or partition to partition copy on-the-fly. This command is different from drbl-ocs (or clonezilla). Clonezilla is used to do massively clone, so it will save the template machine as an image in clonezilla server. On the other hand, ocs-onthefly is used to 1 to 1 copy, so no image will be saved in the server. Just clone disk or partition directly.
There are 2 ways to run ocs-onthefly:

Clone locally: Boot the machine as DRBL client, then clone one disk to another disk. This is specially for when you just want to clone disk, and you only have one machine.
Clone via network: Boot the source and target machine as DRBL clients, then clone disk from one machine to another machine. This is specially for you have 2 machines, and you want to clone them without dismantling machine.

Usage:
ocs-onthefly [OPTION]
Option:

-e, --resize-partition: resize the target disk in target machine (To solve the small partition image restored to larger partition problem.)
-f, --source DEV: specify the source device as DEV (hda, hda1…)
-g, --grub-install GRUB_PARTITION: install grub in hda with root grub directory in GRUB_PARTITION when restoration finishs, GRUB_PARTITION can be one of "/dev/hda1", "/dev/hda2"… or "auto" ("auto" will clonezilla detects the grub root partition automatically)
-i, --filter PROGRAM: use the PROGRAM (gzip/lzop/bzip2/cat) before sending partition data to netcat (only in network clone mode). The default action is gzip. Use "cat" if you do not want to compress (Good for fast internode network).
-n, --no-sfdisk: skip partition table creation
-m, --no-mbr-clone: do NOT clone MBR
-o, --load-geometry: force to use the saved CHS (cylinders, heads, sectors) when using sfdisk in restoring.
-p, --port PORT: specify the netcat port (Only in network clone mode)
-r, --server: specify the running machine is in network clone server.
-s, --source-IP: IP specify the source IP address (used in target client machine).
-t, --target DEV: specify the target device as DEV (hda, hda1…)
-v, --verbose: prints verbose information

ocs-onthefly [OPTION]

Examples:

Clone locally: To clone the 1st harddisk (hda) to 2nd harddisk (hdb), you can boot this machine as DRBL client, then run:
ocs-onthefly -f hda -t hdb
Clone via network: To clone the 1st harddisk (hda) in machine A to the 1st harddisk (hda) in machine B. Then without dismantling machines, you can do it by:
Boot machine A as DRBL client, and it’s IP address is, say, 192.168.100.1, then run:
ocs-onthefly -r -f hda

Then it will prompt you the command to run in machine B, such as:
ocs-thefly --source-IP 192.168.100.1 -t [TARGET_DEV] (TARGET_DEV is like hda, hdb, hda1, hdb1…)

The "TARGET_DEV" is the target harddisk in machine B, in this case, it hda. Then, boot machine B as DRBL client, and run:
ocs-onthefly --source-IP 192.168.100.1 -t hda