:orphan: ============================================================== ceph-objectstore-tool -- modify or examine the state of an OSD ============================================================== Synopsis ======== | **ceph-objectstore-tool** --data-path *path to osd* [--op *list* ] Possible object operations: * (get|set)-bytes [file] * set-(attr|omap) [file] * (get|rm)-attr|omap) * get-omaphdr * set-omaphdr [file] * list-attrs * list-omap * remove|removeall * dump * set-size * clear-data-digest * remove-clone-metadata Description =========== **ceph-objectstore-tool** is a tool for modifying the state of an OSD. It facilitates manipulating an object's content, removing an object, listing the omap, manipulating the omap header, manipulating the omap key, listing object attributes, and manipulating object attribute keys. **ceph-objectstore-tool** provides two main modes: (1) a mode that specifies the "--op" argument (for example, **ceph-objectstore-tool** --data-path $PATH_TO_OSD --op $SELECT_OPERATION [--pgid $PGID] [--dry-run]), and (2) a mode for positional object operations. If the second mode is used, the object can be specified by ID or by the JSON output of the --op list. | **ceph-objectstore-tool** --data-path *path to osd* [--pgid *$PG_ID* ][--op *command*] | **ceph-objectstore-tool** --data-path *path to osd* [ --op *list $OBJECT_ID*] Possible -op commands:: * info * log * remove * mkfs * fsck * repair * fuse * dup * export * export-remove * import * list * list-slow-omap * fix-lost * list-pgs * dump-super * meta-list * get-osdmap * set-osdmap * get-superblock * set-superblock * get-inc-osdmap * set-inc-osdmap * mark-complete * reset-last-complete * update-mon-db * dump-export * trim-pg-log Installation ============ The `ceph-osd` package provides **ceph-objectstore-tool**. Examples ======== Modifying Objects ----------------- These commands modify state of an OSD. The OSD must not be running when ceph-objectstore-tool is used. Listing Objects and Placement Groups ------------------------------------ Make sure that the target OSD is down:: systemctl status ceph-osd@$OSD_NUMBER Identify all objects within an OSD:: ceph-objectstore-tool --data-path $PATH_TO_OSD --op list Identify all objects within a placement group:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID --op list Identify the placement group (PG) that an object belongs to:: ceph-objectstore-tool --data-path $PATH_TO_OSD --op list $OBJECT_ID Fixing Lost Objects ------------------- Make sure the OSD is down:: systemctl status ceph-osd@OSD_NUMBER Fix all lost objects:: ceph-objectstore-tool --data-path $PATH_TO_OSD --op fix-lost Fix all the lost objects within a specified placement group:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID --op fix-lost Fix a lost object by its identifier:: ceph-objectstore-tool --data-path $PATH_TO_OSD --op fix-lost $OBJECT_ID Fix legacy lost objects:: ceph-objectstore-tool --data-path $PATH_TO_OSD --op fix-lost Manipulating an object's content -------------------------------- 1. Make sure that the target OSD is down:: systemctl status ceph-osd@$OSD_NUMBER 2. Find the object by listing the objects of the OSD or placement group. 3. Before setting the bytes on the object, make a backup and a working copy of the object. Here is the syntactic form of that command:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT get-bytes > $OBJECT_FILE_NAME For example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' get-bytes > zone_info.default.backup [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' get-bytes > zone_info.default.working-copy The first command creates the back-up copy, and the second command creates the working copy. 4. Edit the working copy object file. 5. Set the bytes of the object:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT set-bytes < $OBJECT_FILE_NAME For example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' set-bytes < zone_info.default.working-copy Removing an Object ------------------ Use **ceph-objectstore-tool** to remove objects. When an object is removed, its contents and references are removed from the placement group (PG). Remove an object (syntax):: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT remove Remove an object (example):: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' remove Listing the Object Map ---------------------- Use the ceph-objectstore-tool to list the contents of the object map (OMAP). The output is a list of keys. 1. Verify the appropriate OSD is down: Syntax:: systemctl status ceph-osd@$OSD_NUMBER Example:: [root@osd ~]# systemctl status ceph-osd@1 2. List the object map: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT list-omap Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' list-omap Manipulating the Object Map Header ---------------------------------- The **ceph-objectstore-tool** utility will output the object map (OMAP) header with the values associated with the object's keys. Prerequisites ^^^^^^^^^^^^^ * Having root access to the Ceph OSD node. * Stopping the ceph-osd daemon. Procedure ^^^^^^^^^ Verify that the target OSD is down: Syntax:: systemctl status ceph-osd@$OSD_NUMBER Example:: [root@osd ~]# systemctl status ceph-osd@1 Get the object map header: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT get-omaphdr > $OBJECT_MAP_FILE_NAME Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' get-omaphdr > zone_info.default.omaphdr.txt Set the object map header: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT get-omaphdr < $OBJECT_MAP_FILE_NAME Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' set-omaphdr < zone_info.default.omaphdr.txt Manipulating the Object Map Key ------------------------------- Use the **ceph-objectstore-tool** utility to change the object map (OMAP) key. Provide the data path, the placement group identifier (PG ID), the object, and the key in the OMAP. Prerequisites ^^^^^^^^^^^^^ * Having root access to the Ceph OSD node. * Stopping the ceph-osd daemon. Commands ^^^^^^^^ Run the commands in this section as ``root`` on an OSD node. * **Getting the object map key** Syntax: .. code-block:: ini ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT get-omap $KEY > $OBJECT_MAP_FILE_NAME Example:: ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' get-omap "" > zone_info.default.omap.txt * **Setting the object map key** Syntax: .. code-block:: ini ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT set-omap $KEY < $OBJECT_MAP_FILE_NAME Example:: ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' set-omap "" < zone_info.default.omap.txt * **Removing the object map key** Syntax: .. code-block:: ini ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT rm-omap $KEY Example:: ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' rm-omap "" Listing an Object's Attributes ------------------------------- Use the **ceph-objectstore-tool** utility to list an object's attributes. The output provides you with the object's keys and values. Note Prerequisites ^^^^^^^^^^^^^ * Having root access to the Ceph OSD node. * Stopping the ceph-osd daemon. Procedure ^^^^^^^^^ Verify that the target OSD is down: Syntax:: systemctl status ceph-osd@$OSD_NUMBER Example:: [root@osd ~]# systemctl status ceph-osd@1 List the object's attributes: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT list-attrs Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' list-attrs MANIPULATING THE OBJECT ATTRIBUTE KEY ------------------------------------- Use the ceph-objectstore-tool utility to change an object's attributes. To manipulate the object's attributes you need the data and journal paths, the placement group identifier (PG ID), the object, and the key in the object's attribute. Note Prerequisites * Having root access to the Ceph OSD node. * Stopping the ceph-osd daemon. Procedure Verify that the target OSD is down. Syntax:: systemctl status ceph-osd@$OSD_NUMBER Example:: [root@osd ~]# systemctl status ceph-osd@1 Get the object's attributes: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT get-attrs $KEY > $OBJECT_ATTRS_FILE_NAME Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' get-attrs "oid" > zone_info.default.attr.txt Set an object's attributes: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT set-attrs $KEY < $OBJECT_ATTRS_FILE_NAME Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' set-attrs "oid" < zone_info.default.attr.txt Remove an object's attributes: Syntax:: ceph-objectstore-tool --data-path $PATH_TO_OSD --pgid $PG_ID $OBJECT rm-attrs $KEY Example:: [root@osd ~]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' rm-attrs "oid" Options ======= .. option:: --help produce help message .. option:: --type arg Arg is one of [bluestore (default), memstore]. This option is needed only if the tool can't tell the type from --data-path. .. option:: --data-path arg path to object store, mandatory .. option:: --journal-path arg path to journal, use if tool can't find it .. option:: --pgid arg PG id, mandatory for info, log, remove, export, export-remove, mark-complete, trim-pg-log .. option:: --pool arg Pool name .. option:: --op arg Arg is one of [info, log, remove, mkfs, fsck, repair, fuse, dup, export, export-remove, import, list, fix-lost, list-pgs, dump-super, meta-list, get-osdmap, set-osdmap, get-superblock, set-superblock, get-inc-osdmap, set-inc-osdmap, mark-complete, reset-last-complete, update-mon-db, dump-export, trim-pg-log] .. option:: --epoch arg epoch# for get-osdmap and get-inc-osdmap, the current epoch in use if not specified .. option:: --file arg path of file to export, export-remove, import, get-osdmap, set-osdmap, get-superblock, set-superblock, get-inc-osdmap or set-inc-osdmap .. option:: --mon-store-path arg path of monstore to update-mon-db .. option:: --fsid arg fsid for new store created by mkfs .. option:: --target-data-path arg path of target object store (for --op dup) .. option:: --mountpoint arg fuse mountpoint .. option:: --format arg (=json-pretty) Output format which may be json, json-pretty, xml, xml-pretty .. option:: --debug Enable diagnostic output to stderr .. option:: --force Ignore some types of errors and proceed with operation - USE WITH CAUTION: CORRUPTION POSSIBLE NOW OR IN THE FUTURE .. option:: --skip-journal-replay Disable journal replay .. option:: --skip-mount-omap Disable mounting of omap .. option:: --head Find head/snapdir when searching for objects by name .. option:: --dry-run Don't modify the objectstore .. option:: --namespace arg Specify namespace when searching for objects .. option:: --rmtype arg Specify corrupting object removal 'snapmap' or 'nosnapmap' - TESTING USE ONLY Error Codes =========== "Mount failed with '(11) Resource temporarily unavailable" - This might mean that you have attempted to run **ceph-objectstore-tool** on a running OSD. Availability ============ **ceph-objectstore-tool** is part of Ceph, a massively scalable, open-source, distributed storage system. **ceph-objectstore-tool** is provided by the package `ceph-osd`. Refer to the Ceph documentation at http://ceph.com/docs for more information.