Ubuntu Manpage: rados - rados object storage utility

Provided by: ceph-common_15.2.17-0ubuntu0.20.04.6_amd64

NAME

       rados - rados object storage utility

SYNOPSIS

       rados [ options ] [ command ]

DESCRIPTION

       rados is a utility for interacting with a Ceph object storage cluster (RADOS), part of the
       Ceph distributed storage system.

OPTIONS

       -p pool, --pool pool
              Interact with the given pool. Required by most commands.

       --pgid As an alternative to --pool, --pgid also allow users to specify the PG id to  which
              the  command  will  be  directed.  With this option, certain commands like ls allow
              users to limit the scope of the command to the given PG.

       -N namespace, --namespace namespace
              Specify the rados namespace to use for the object.

       -s snap, --snap snap
              Read from the given pool snapshot. Valid for all pool-specific read operations.

       -i infile
              will specify an input file to be passed along as a payload with the command to  the
              monitor cluster. This is only used for specific monitor commands.

       -o outfile
              will  write  any payload returned by the monitor cluster with its reply to outfile.
              Only specific monitor commands (e.g. osd getmap) return a payload.

       -c ceph.conf, --conf=ceph.conf
              Use ceph.conf configuration file instead  of  the  default  /etc/ceph/ceph.conf  to
              determine monitor addresses during startup.

       -m monaddress[:port]
              Connect to specified monitor (instead of looking through ceph.conf).

       -b block_size
              Set the block size for put/get/append ops and for write benchmarking.

       --striper
              Uses  the  striping  API of rados rather than the default one.  Available for stat,
              stat2, get, put, append, truncate, rm, ls and all xattr related operation

       -O object_size
              Set the object size for put/get ops and for write benchmarking

       --lock-cookie locker-cookie
              Will set the lock cookie for acquiring advisory lock (lock get  command).   If  the
              cookie  is  not empty, this option must be passed to lock break command to find the
              correct lock when releasing lock.

GLOBAL COMMANDS

       lspools
              List object pools

       df     Show utilization statistics, including disk usage (bytes) and object  counts,  over
              the entire system and broken down by pool.

       list-inconsistent-pg pool
              List inconsistent PGs in given pool.

       list-inconsistent-obj pgid
              List inconsistent objects in given PG.

       list-inconsistent-snapset pgid
              List inconsistent snapsets in given PG.

POOL SPECIFIC COMMANDS

get name outfile
Read object name from the cluster and write it to outfile.

put name infile [--offset offset]
Write object name with start offset (default:0) to the cluster with contents from
infile. Warning: The put command creates a single RADOS object, sized just as
large as your input file. Unless your objects are of reasonable and consistent
sizes, that is probably not what you want -- consider using RGW/S3, CephFS, or RBD
instead.

append name infile
Append object name to the cluster with contents from infile.

rm name
Remove object name.

listwatchers name
List the watchers of object name.

ls outfile
List objects in the given pool and write to outfile. Instead of --pool if --pgid
will be specified, ls will only list the objects in the given PG.

lssnap List snapshots for given pool.

clonedata srcname dstname --object-locator key
Clone object byte data from srcname to dstname. Both objects must be stored with
the locator key key (usually either srcname or dstname). Object attributes and
omap keys are not copied or cloned.

mksnap foo
Create pool snapshot named foo.

rmsnap foo
Remove pool snapshot named foo.

bench seconds mode [ -b objsize ] [ -t threads ]
Benchmark for seconds. The mode can be write, seq, or rand. seq and rand are read
benchmarks, either sequential or random. Before running one of the reading
benchmarks, run a write benchmark with the --no-cleanup option. The default object
size is 4 MB, and the default number of simulated threads (parallel writes) is 16.
The --run-name <label> option is useful for benchmarking a workload test from
multiple clients. The <label> is an arbitrary object name. It is
"benchmark_last_metadata" by default, and is used as the underlying object name for
"read" and "write" ops. Note: -b objsize option is valid only in write mode.
Note: write and seq must be run on the same host otherwise the objects created by
write will have names that will fail seq.

cleanup [ --run-name run_name ] [ --prefix prefix ]
Clean up a previous benchmark operation. Note: the default run-name is
"benchmark_last_metadata"

listxattr name
List all extended attributes of an object.

getxattr name attr
Dump the extended attribute value of attr of an object.

setxattr name attr value
Set the value of attr in the extended attributes of an object.

rmxattr name attr
Remove attr from the extended attributes of an object.

stat name
Get stat (ie. mtime, size) of given object

stat2 name
Get stat (similar to stat, but with high precision time) of given object

listomapkeys name
List all the keys stored in the object map of object name.

listomapvals name
List all key/value pairs stored in the object map of object name. The values are
dumped in hexadecimal.

getomapval [ --omap-key-file file ] name key [ out-file ]
Dump the hexadecimal value of key in the object map of object name. If the
optional out-file argument is not provided, the value will be written to standard
output.

setomapval [ --omap-key-file file ] name key [ value ]
Set the value of key in the object map of object name. If the optional value
argument is not provided, the value will be read from standard input.

rmomapkey [ --omap-key-file file ] name key
Remove key from the object map of object name.

getomapheader name
Dump the hexadecimal value of the object map header of object name.

setomapheader name value
Set the value of the object map header of object name.

export filename
Serialize pool contents to a file or standard output.n"

import [--dry-run] [--no-overwrite] < filename | - >
Load pool contents from a file or standard input

EXAMPLES

       To view cluster utilization:

          rados df

       To get a list object in pool foo sent to stdout:

          rados -p foo ls -

       To get a list of objects in PG 0.6:

          rados --pgid 0.6 ls

       To write an object:

          rados -p foo put myobject blah.txt

       To create a snapshot:

          rados -p foo mksnap mysnap

       To delete the object:

          rados -p foo rm myobject

       To read a previously snapshotted version of an object:

          rados -p foo -s mysnap get myobject blah.txt.old

       To list inconsistent objects in PG 0.6:

          rados list-inconsistent-obj 0.6 --format=json-pretty

AVAILABILITY

       rados is part of Ceph, a massively  scalable,  open-source,  distributed  storage  system.
       Please refer to the Ceph documentation at http://ceph.com/docs for more information.

COPYRIGHT

       2010-2024,  Inktank  Storage,  Inc.  and  contributors.  Licensed  under  Creative Commons
       Attribution Share Alike 3.0 (CC-BY-SA-3.0)