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|
.. _object-server-config:
---------------------------
Object Server Configuration
---------------------------
This document describes the configuration options available for the object
server. Documentation for other swift configuration options can be found at
:doc:`index`.
An Example Object Server configuration can be found at
etc/object-server.conf-sample in the source code repository.
The following configuration sections are available:
* :ref:`[DEFAULT] <object-server-default-options>`
* `[object-server]`_
* `[object-replicator]`_
* `[object-reconstructor]`_
* `[object-updater]`_
* `[object-auditor]`_
* `[object-expirer]`_
.. _object-server-default-options:
*********
[DEFAULT]
*********
================================ ========== ============================================
Option Default Description
-------------------------------- ---------- --------------------------------------------
swift_dir /etc/swift Swift configuration directory
devices /srv/node Parent directory of where devices are
mounted
mount_check true Whether or not check if the devices are
mounted to prevent accidentally writing
to the root device
bind_ip 0.0.0.0 IP Address for server to bind to
bind_port 6200 Port for server to bind to
keep_idle 600 Value to set for socket TCP_KEEPIDLE
bind_timeout 30 Seconds to attempt bind before giving up
backlog 4096 Maximum number of allowed pending
connections
workers auto Override the number of pre-forked workers
that will accept connections. If set it
should be an integer, zero means no fork.
If unset, it will try to default to the
number of effective cpu cores and fallback
to one. Increasing the number of workers
helps slow filesystem operations in one
request from negatively impacting other
requests, but only the
:ref:`servers_per_port
<server-per-port-configuration>` option
provides complete I/O isolation with no
measurable overhead.
servers_per_port 0 If each disk in each storage policy ring
has unique port numbers for its "ip"
value, you can use this setting to have
each object-server worker only service
requests for the single disk matching the
port in the ring. The value of this
setting determines how many worker
processes run for each port (disk) in the
ring. If you have 24 disks per server, and
this setting is 4, then each storage node
will have 1 + (24 * 4) = 97 total
object-server processes running. This
gives complete I/O isolation, drastically
reducing the impact of slow disks on
storage node performance. The
object-replicator and object-reconstructor
need to see this setting too, so it must
be in the [DEFAULT] section.
See :ref:`server-per-port-configuration`.
max_clients 1024 Maximum number of clients one worker can
process simultaneously (it will actually
accept(2) N + 1). Setting this to one (1)
will only handle one request at a time,
without accepting another request
concurrently.
disable_fallocate false Disable "fast fail" fallocate checks if
the underlying filesystem does not support
it.
log_name swift Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
log_max_line_length 0 Caps the length of log lines to the
value given; no limit if set to 0, the
default.
log_custom_handlers None Comma-separated list of functions to call
to setup custom log handlers.
log_udp_host Override log_address
log_udp_port 514 UDP log port
log_statsd_host None Enables StatsD logging; IPv4/IPv6
address or a hostname. If a
hostname resolves to an IPv4 and IPv6
address, the IPv4 address will be
used.
log_statsd_port 8125
log_statsd_default_sample_rate 1.0
log_statsd_sample_rate_factor 1.0
log_statsd_metric_prefix
eventlet_debug false If true, turn on debug logging for
eventlet
fallocate_reserve 1% You can set fallocate_reserve to the
number of bytes or percentage of disk
space you'd like fallocate to reserve,
whether there is space for the given
file size or not. Percentage will be used
if the value ends with a '%'. This is
useful for systems that behave badly when
they completely run out of space; you can
make the services pretend they're out of
space early.
conn_timeout 0.5 Time to wait while attempting to connect
to another backend node.
node_timeout 3 Time to wait while sending each chunk of
data to another backend node.
client_timeout 60 Time to wait while receiving each chunk of
data from a client or another backend node
network_chunk_size 65536 Size of chunks to read/write over the
network
disk_chunk_size 65536 Size of chunks to read/write to disk
container_update_timeout 1 Time to wait while sending a container
update on object update.
reclaim_age 604800 Time elapsed in seconds before the tombstone
file representing a deleted object can be
reclaimed. This is the maximum window for
your consistency engine. If a node that was
disconnected from the cluster because of a
fault is reintroduced into the cluster after
this window without having its data purged
it will result in dark data. This setting
should be consistent across all object
services.
commit_window 60 Non-durable data files may also
get reclaimed if they are older
than reclaim_age, but not if the
time they were written to disk
(i.e. mtime) is less than
commit_window seconds ago. A
commit_window greater than zero is
strongly recommended to avoid
unintended reclamation of data
files that were about to become
durable; commit_window should be
much less than reclaim_age.
nice_priority None Scheduling priority of server processes.
Niceness values range from -20 (most
favorable to the process) to 19 (least
favorable to the process). The default
does not modify priority.
ionice_class None I/O scheduling class of server processes.
I/O niceness class values are IOPRIO_CLASS_RT
(realtime), IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify class and
priority. Linux supports io scheduling
priorities and classes since 2.6.13 with
the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority is
a number which goes from 0 to 7.
The higher the value, the lower the I/O
priority of the process. Work only with
ionice_class.
Ignored if IOPRIO_CLASS_IDLE is set.
================================ ========== ============================================
.. _object-server-options:
***************
[object-server]
***************
================================== ====================== ===============================================
Option Default Description
---------------------------------- ---------------------- -----------------------------------------------
use paste.deploy entry point for the
object server. For most cases,
this should be
``egg:swift#object``.
set log_name object-server Label used when logging
set log_facility LOG_LOCAL0 Syslog log facility
set log_level INFO Logging level
set log_requests True Whether or not to log each
request
set log_address /dev/log Logging directory
user swift User to run as
max_upload_time 86400 Maximum time allowed to upload an
object
slow 0 If > 0, Minimum time in seconds for a PUT or
DELETE request to complete. This is only
useful to simulate slow devices during testing
and development.
mb_per_sync 512 On PUT requests, sync file every
n MB
keep_cache_size 5242880 Largest object size to keep in
buffer cache
keep_cache_private false Allow non-public objects to stay
in kernel's buffer cache
keep_cache_slo_manifest false Allow SLO object's manifest file to stay in
kernel's buffer cache if its size is under
keep_cache_size. This config will only matter
when 'keep_cache_private' is false.
allowed_headers Content-Disposition, Comma separated list of headers
Content-Encoding, that can be set in metadata on an object.
X-Delete-At, This list is in addition to
X-Object-Manifest, X-Object-Meta-* headers and cannot include
X-Static-Large-Object Content-Type, etag, Content-Length, or deleted
Cache-Control,
Content-Language,
Expires,
X-Robots-Tag
replication_server Configure parameter for creating
specific server. To handle all verbs,
including replication verbs, do not
specify "replication_server"
(this is the default). To only
handle replication, set to a True
value (e.g. "True" or "1").
To handle only non-replication
verbs, set to "False". Unless you
have a separate replication network, you
should not specify any value for
"replication_server".
replication_concurrency 4 Set to restrict the number of
concurrent incoming SSYNC
requests; set to 0 for unlimited
replication_concurrency_per_device 1 Set to restrict the number of
concurrent incoming SSYNC
requests per device; set to 0 for
unlimited requests per devices.
This can help control I/O to each
device. This does not override
replication_concurrency described
above, so you may need to adjust
both parameters depending on your
hardware or network capacity.
replication_lock_timeout 15 Number of seconds to wait for an
existing replication device lock
before giving up.
replication_failure_threshold 100 The number of subrequest failures
before the
replication_failure_ratio is
checked
replication_failure_ratio 1.0 If the value of failures /
successes of SSYNC
subrequests exceeds this ratio,
the overall SSYNC request
will be aborted
splice no Use splice() for zero-copy object
GETs. This requires Linux kernel
version 3.0 or greater. If you set
"splice = yes" but the kernel
does not support it, error messages
will appear in the object server
logs at startup, but your object
servers should continue to function.
nice_priority None Scheduling priority of server processes.
Niceness values range from -20 (most
favorable to the process) to 19 (least
favorable to the process). The default
does not modify priority.
ionice_class None I/O scheduling class of server processes.
I/O niceness class values are IOPRIO_CLASS_RT
(realtime), IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify class and
priority. Linux supports io scheduling
priorities and classes since 2.6.13 with
the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority is
a number which goes from 0 to 7.
The higher the value, the lower the I/O
priority of the process. Work only with
ionice_class.
Ignored if IOPRIO_CLASS_IDLE is set.
eventlet_tpool_num_threads auto The number of threads in eventlet's thread pool.
Most IO will occur in the object server's main
thread, but certain "heavy" IO operations will
occur in separate IO threads, managed by
eventlet.
The default value is auto, whose actual value
is dependent on the servers_per_port value.
If servers_per_port is zero then it uses
eventlet's default (currently 20 threads).
If the servers_per_port is nonzero then it'll
only use 1 thread per process.
This value can be overridden with an integer
value.
================================== ====================== ===============================================
*******************
[object-replicator]
*******************
=========================== ======================== ================================
Option Default Description
--------------------------- ------------------------ --------------------------------
log_name object-replicator Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
daemonize yes Whether or not to run replication
as a daemon
interval 30 Time in seconds to wait between
replication passes
concurrency 1 Number of replication jobs to
run per worker process
replicator_workers 0 Number of worker processes to use.
No matter how big this number is,
at most one worker per disk will
be used. The default value of 0
means no forking; all work is done
in the main process.
sync_method rsync The sync method to use; default
is rsync but you can use ssync to
try the EXPERIMENTAL
all-swift-code-no-rsync-callouts
method. Once ssync is verified as
or better than, rsync, we plan to
deprecate rsync so we can move on
with more features for
replication.
rsync_timeout 900 Max duration of a partition rsync
rsync_bwlimit 0 Bandwidth limit for rsync in kB/s.
0 means unlimited.
rsync_io_timeout 30 Timeout value sent to rsync
--timeout and --contimeout
options
rsync_compress no Allow rsync to compress data
which is transmitted to destination
node during sync. However, this
is applicable only when destination
node is in a different region
than the local one.
NOTE: Objects that are already
compressed (for example: .tar.gz,
.mp3) might slow down the syncing
process.
stats_interval 300 Interval in seconds between
logging replication statistics
handoffs_first false If set to True, partitions that
are not supposed to be on the
node will be replicated first.
The default setting should not be
changed, except for extreme
situations.
handoff_delete auto By default handoff partitions
will be removed when it has
successfully replicated to all
the canonical nodes. If set to an
integer n, it will remove the
partition if it is successfully
replicated to n nodes. The
default setting should not be
changed, except for extreme
situations.
node_timeout DEFAULT or 10 Request timeout to external
services. This uses what's set
here, or what's set in the
DEFAULT section, or 10 (though
other sections use 3 as the final
default).
http_timeout 60 Max duration of an http request.
This is for REPLICATE finalization
calls and so should be longer
than node_timeout.
lockup_timeout 1800 Attempts to kill all workers if
nothing replicates for
lockup_timeout seconds
rsync_module {replication_ip}::object Format of the rsync module where
the replicator will send data.
The configuration value can
include some variables that will
be extracted from the ring.
Variables must follow the format
{NAME} where NAME is one of: ip,
port, replication_ip,
replication_port, region, zone,
device, meta. See
etc/rsyncd.conf-sample for some
examples.
rsync_error_log_line_length 0 Limits how long rsync error log
lines are
ring_check_interval 15 Interval for checking new ring
file
recon_cache_path /var/cache/swift Path to recon cache
nice_priority None Scheduling priority of server
processes. Niceness values
range from -20 (most favorable
to the process) to 19 (least
favorable to the process).
The default does not modify
priority.
ionice_class None I/O scheduling class of server
processes. I/O niceness class
values are IOPRIO_CLASS_RT (realtime),
IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify
class and priority.
Linux supports io scheduling
priorities and classes since
2.6.13 with the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority
is a number which goes from
0 to 7. The higher the value,
the lower the I/O priority of
the process.
Work only with ionice_class.
Ignored if IOPRIO_CLASS_IDLE
is set.
=========================== ======================== ================================
**********************
[object-reconstructor]
**********************
=========================== ======================== ================================
Option Default Description
--------------------------- ------------------------ --------------------------------
log_name object-reconstructor Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
daemonize yes Whether or not to run
reconstruction as a daemon
interval 30 Time in seconds to wait between
reconstruction passes
reconstructor_workers 0 Maximum number of worker processes
to spawn. Each worker will handle
a subset of devices. Devices will
be assigned evenly among the workers
so that workers cycle at similar
intervals (which can lead to fewer
workers than requested). You can not
have more workers than devices. If
you have no devices only a single
worker is spawned.
concurrency 1 Number of reconstruction threads to
spawn per reconstructor process.
stats_interval 300 Interval in seconds between
logging reconstruction statistics
handoffs_only false The handoffs_only mode option is for
special case emergency situations
during rebalance such as disk full in
the cluster. This option SHOULD NOT
BE CHANGED, except for extreme
situations. When handoffs_only mode
is enabled the reconstructor will
*only* revert fragments from handoff
nodes to primary nodes and will not
sync primary nodes with neighboring
primary nodes. This will force the
reconstructor to sync and delete
handoffs' fragments more quickly and
minimize the time of the rebalance by
limiting the number of rebuilds. The
handoffs_only option is only for
temporary use and should be disabled
as soon as the emergency situation
has been resolved.
rebuild_handoff_node_count 2 The default strategy for unmounted
drives will stage
rebuilt data on a
handoff node until
updated rings are
deployed. Because
fragments are rebuilt on
offset handoffs based on
fragment index and the
proxy limits how deep it
will search for EC frags
we restrict how many
nodes we'll try.
Setting to 0 will
disable rebuilds to
handoffs and only
rebuild fragments for
unmounted devices to
mounted primaries after
a ring change. Setting
to -1 means "no limit".
max_objects_per_revert 0 By default the reconstructor
attempts to revert all
objects from handoff
partitions in a single
batch using a single
SSYNC request. In
exceptional
circumstances
max_objects_per_revert
can be used to
temporarily limit the
number of objects
reverted by each
reconstructor revert
type job. If more than
max_objects_per_revert
are available in a
sender's handoff
partition, the remaining
objects will remain in
the handoff partition
and will not be reverted
until the next time the
reconstructor visits
that handoff partition
i.e. with this option
set, a single cycle of
the reconstructor may
not completely revert
all handoff partitions.
The option has no effect
on reconstructor sync
type jobs between
primary partitions. A
value of 0 (the default)
means there is no limit.
node_timeout DEFAULT or 10 Request timeout to external
services. The value used is the value
set in this section, or the value set
in the DEFAULT section, or 10.
http_timeout 60 Max duration of an http request.
This is for REPLICATE finalization
calls and so should be longer
than node_timeout.
lockup_timeout 1800 Attempts to kill all threads if
no fragment has been reconstructed
for lockup_timeout seconds.
ring_check_interval 15 Interval for checking new ring
file
recon_cache_path /var/cache/swift Path to recon cache
nice_priority None Scheduling priority of server
processes. Niceness values
range from -20 (most favorable
to the process) to 19 (least
favorable to the process).
The default does not modify
priority.
ionice_class None I/O scheduling class of server
processes. I/O niceness class
values are IOPRIO_CLASS_RT (realtime),
IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify
class and priority.
Linux supports io scheduling
priorities and classes since
2.6.13 with the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority
is a number which goes from
0 to 7. The higher the value,
the lower the I/O priority of
the process.
Work only with ionice_class.
Ignored if IOPRIO_CLASS_IDLE
is set.
quarantine_threshold 0 The reconstructor may quarantine
stale isolated fragments
when it fails to fetch
more than the
quarantine_threshold
number of fragments
(including the stale
fragment) during an
attempt to reconstruct.
quarantine_age reclaim_age Fragments are not quarantined
until they are older than
quarantine_age, which defaults
to the value of reclaim_age.
=========================== ======================== ================================
****************
[object-updater]
****************
=================== =================== ==========================================
Option Default Description
------------------- ------------------- ------------------------------------------
log_name object-updater Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
interval 300 Minimum time for a pass to take
updater_workers 1 Number of worker processes
concurrency 8 Number of updates to run concurrently in
each worker process
node_timeout DEFAULT or 10 Request timeout to external services. This
uses what's set here, or what's set in the
DEFAULT section, or 10 (though other
sections use 3 as the final default).
objects_per_second 50 Maximum objects updated per second.
Should be tuned according to individual
system specs. 0 is unlimited.
slowdown 0.01 Time in seconds to wait between objects.
Deprecated in favor of objects_per_second.
report_interval 300 Interval in seconds between logging
statistics about the current update pass.
recon_cache_path /var/cache/swift Path to recon cache
nice_priority None Scheduling priority of server processes.
Niceness values range from -20 (most
favorable to the process) to 19 (least
favorable to the process). The default
does not modify priority.
ionice_class None I/O scheduling class of server processes.
I/O niceness class values are IOPRIO_CLASS_RT
(realtime), IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify class and
priority. Linux supports io scheduling
priorities and classes since 2.6.13 with
the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority is
a number which goes from 0 to 7.
The higher the value, the lower the I/O
priority of the process. Work only with
ionice_class.
Ignored if IOPRIO_CLASS_IDLE is set.
=================== =================== ==========================================
****************
[object-auditor]
****************
=========================== =================== ==========================================
Option Default Description
--------------------------- ------------------- ------------------------------------------
log_name object-auditor Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
log_time 3600 Frequency of status logs in seconds.
interval 30 Time in seconds to wait between
auditor passes
disk_chunk_size 65536 Size of chunks read during auditing
files_per_second 20 Maximum files audited per second per
auditor process. Should be tuned according
to individual system specs. 0 is unlimited.
bytes_per_second 10000000 Maximum bytes audited per second per
auditor process. Should be tuned according
to individual system specs. 0 is unlimited.
concurrency 1 The number of parallel processes to use
for checksum auditing.
zero_byte_files_per_second 50
object_size_stats
recon_cache_path /var/cache/swift Path to recon cache
rsync_tempfile_timeout auto Time elapsed in seconds before rsync
tempfiles will be unlinked. Config value
of "auto" try to use object-replicator's
rsync_timeout + 900 or fallback to 86400
(1 day).
nice_priority None Scheduling priority of server processes.
Niceness values range from -20 (most
favorable to the process) to 19 (least
favorable to the process). The default
does not modify priority.
ionice_class None I/O scheduling class of server processes.
I/O niceness class values are IOPRIO_CLASS_RT
(realtime), IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify class and
priority. Linux supports io scheduling
priorities and classes since 2.6.13 with
the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority is
a number which goes from 0 to 7.
The higher the value, the lower the I/O
priority of the process. Work only with
ionice_class.
Ignored if IOPRIO_CLASS_IDLE is set.
=========================== =================== ==========================================
****************
[object-expirer]
****************
============================= =============================== ==========================================
Option Default Description
----------------------------- ------------------------------- ------------------------------------------
log_name object-expirer Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
interval 300 Time in seconds to wait between
expirer passes
report_interval 300 Frequency of status logs in seconds.
concurrency 1 Level of concurrency to use to do the work,
this value must be set to at least 1
dequeue_from_legacy False This service will look for jobs on the
legacy expirer task queue.
round_robin_task_cache_size 100000 Number of tasks objects to cache before processing.
processes 0 How many parts to divide the legacy work into,
one part per process that will be doing the work.
When set 0 means that a single legacy
process will be doing all the work.
This can only be used in conjunction with
``dequeue_from_legacy``.
process 0 Which of the parts a particular legacy process will
work on. It is "zero based", if you want to use 3
processes, you should run processes with process
set to 0, 1, and 2.
This can only be used in conjunction with
``dequeue_from_legacy``.
reclaim_age 604800 How long an un-processable expired object
marker will be retried before it is abandoned.
It is not coupled with the tombstone reclaim age
in the consistency engine.
request_tries 3 The number of times the expirer's internal client
will attempt any given request in the event
of failure
recon_cache_path /var/cache/swift Path to recon cache
nice_priority None Scheduling priority of server processes.
Niceness values range from -20 (most
favorable to the process) to 19 (least
favorable to the process). The default
does not modify priority.
ionice_class None I/O scheduling class of server processes.
I/O niceness class values are IOPRIO_CLASS_RT
(realtime), IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify class and
priority. Linux supports io scheduling
priorities and classes since 2.6.13 with
the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority is
a number which goes from 0 to 7.
The higher the value, the lower the I/O
priority of the process. Work only with
ionice_class.
Ignored if IOPRIO_CLASS_IDLE is set.
delay_reaping_<ACCT> 0.0 A dynamic configuration option for
setting account level delay_reaping values.
The delay_reaping value is configured for
the account with the name placed in
<ACCT>. The object expirer will reap objects in
this account from disk only after this delay
following their x-delete-at time.
delay_reaping_<ACCT>/<CNTR> 0.0 A dynamic configuration option for
setting container level delay_reaping values.
The delay_reaping value is configured for
the container with the account name placed
in <ACCT> and the container name in <CNTR>.
The object expirer will reap objects in this
container from disk only after this delay
following their x-delete-at time.
============================= =============================== ==========================================
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