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mongod.1
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mongod.1
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.\" Man page generated from reStructuredText.
.
.TH "MONGOD" "1" "March 18, 2014" "2.6" "mongodb-manual"
.SH NAME
mongod \- MongoDB Server
.
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.SH SYNOPSIS
.sp
\fBmongod\fP is the primary daemon process for the MongoDB
system. It handles data requests, manages data format, and performs
background management operations.
.sp
This document provides a complete overview of all command line options
for \fBmongod\fP\&. These options are primarily useful for testing
purposes. In common operation, use the \fBconfiguration file
options\fP to control the behavior of
your database, which is fully capable of all operations described
below.
.SH OPTIONS
.SS Core Options
.INDENT 0.0
.TP
.B mongod
.UNINDENT
.INDENT 0.0
.TP
.B \-\-help, \-h
Returns information on \fBmongod\fP options and usage.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-version
Returns the \fBmongod\fP release number.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-config <filename>, \-f
Specifies a configuration file for runtime configuration options. The
configuration file is the preferred method for runtime configuration of
\fBmongod\fP\&. The options are equivalent to the command\-line
configuration options. See http://docs.mongodb.org/manual/reference/configuration\-options for
more information.
.sp
Ensure the configuration file uses ASCII encoding. \fBmongod\fP does not
support configuration files with non\-ASCII encoding, including UTF\-8.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on standard output
or in log files. Increase the verbosity with the \fB\-v\fP form by
including the option multiple times, (e.g. \fB\-vvvvv\fP\&.)
.UNINDENT
.INDENT 0.0
.TP
.B \-\-quiet
Runs \fBmongod\fP in a quiet mode that attempts to limit the amount of
output. This option suppresses:
.INDENT 7.0
.IP \(bu 2
output from \fIdatabase commands\fP
.IP \(bu 2
replication activity
.IP \(bu 2
connection accepted events
.IP \(bu 2
connection closed events
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-port <port>
Specifies the port number when the MongoDB instance is not running on the
standard port of \fB27017\fP\&. You may also specify the port number
using the \fB\-\-host\fP option.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-bind_ip <ip address>
Specifies the IP address that the \fBmongod\fP process binds to and
listens for connections on. By default \fBmongod\fP listens for
connections for all interfaces. You may attach \fBmongod\fP to any
interface. When attaching \fBmongod\fP to a publicly accessible
interface, ensure that you have implemented proper authentication and
firewall restrictions to protect the integrity of your database.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-maxConns <number>
Specifies the maximum number of simultaneous connections that
\fBmongod\fP will accept. This setting has no effect if it is
higher than your operating system\(aqs configured maximum connection
tracking threshold.
.sp
Changed in version 2.6: MongoDB removed the upward limit on the \fBmaxConns\fP setting.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-syslog
Sends all logging output to the host\(aqs \fIsyslog\fP system rather
than to standard output or a log file as with \fI\-\-logpath\fP\&.
.sp
\fI\-\-syslog\fP is not supported on Windows.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-syslogFacility <string>
Specifies the facility level used when logging messages to syslog. The
default is \fBuser\fP\&. The value you specify must be supported by your
operating system\(aqs implementation of syslog. To use this option, you
must enable the \fI\-\-syslog\fP option.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-logpath <path>
Specifies the path for the log file that holds all diagnostic
logging information.
.sp
Unless specified, \fBmongod\fP will output all log information
to the standard output. Additionally, unless you also specify
\fI\-\-logappend\fP, the logfile will be overwritten when the
process restarts.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
The behavior of the logging system may change in the near
future in response to the \fI\%SERVER\-4499\fP case.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-logappend
Appends new entries to the end of the logfile when the \fBmongod\fP restarts
instead of overwriting the content of the log.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-timeStampFormat <string>
Specifies the time format for timestamps in log messages. Specify one of
the following values:
.TS
center;
|l|l|.
_
T{
Value
T} T{
Description
T}
_
T{
\fBctime\fP
T} T{
Displays timestamps as \fBWed Dec 31
18:17:54.811\fP\&.
T}
_
T{
\fBiso8601\-utc\fP
T} T{
Displays timestamps in Coordinated Universal Time (UTC) in the
ISO\-8601 format. For example, for New York at the start of the
Epoch: \fB1970\-01\-01T00:00:00.000Z\fP
T}
_
T{
\fBiso8601\-local\fP
T} T{
Default value. Displays timestamps in local time in the ISO\-8601
format. For example, for New York at the start of the Epoch:
\fB1969\-12\-31T19:00:00.000+0500\fP
T}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-diaglog <value>
Deprecated since version 2.6.
.sp
\fI\%\-\-diaglog\fP is for internal use and not intended for most users.
.sp
Creates a very verbose, \fIdiagnostic log\fP for troubleshooting and
recording various errors. MongoDB writes these log files in the
\fBdbpath\fP directory in a series of files that begin with the
string \fBdiaglog\fP and end with the initiation time of the logging as a
hex string.
.sp
The specified value configures the level of verbosity. Possible values,
and their impact are as follows.
.TS
center;
|l|l|.
_
T{
\fBValue\fP
T} T{
\fBSetting\fP
T}
_
T{
0
T} T{
off. No logging.
T}
_
T{
1
T} T{
Log write operations.
T}
_
T{
2
T} T{
Log read operations.
T}
_
T{
3
T} T{
Log both read and write operations.
T}
_
T{
7
T} T{
Log write and some read operations.
T}
_
.TE
.sp
You can use the \fBmongosniff\fP tool to replay this output for
investigation. Given a typical diaglog file, located at
\fB/data/db/diaglog.4f76a58c\fP, you might use a command in the following
form to read these files:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongosniff \-\-source DIAGLOG /data/db/diaglog.4f76a58c
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Setting the diagnostic level to \fB0\fP will cause \fBmongod\fP
to stop writing data to the \fIdiagnostic log\fP file. However,
the \fBmongod\fP instance will continue to keep the file open,
even if it is no longer writing data to the file. If you want to
rename, move, or delete the diagnostic log you must cleanly shut
down the \fBmongod\fP instance before doing so.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-traceExceptions
For internal diagnostic use only.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-pidfilepath <path>
Specifies a file location to hold the "\fIPID\fP" or process ID of the
\fBmongod\fP process. Useful for tracking the \fBmongod\fP process in
combination with the \fI\-\-fork\fP option.
.sp
Without a specified \fI\-\-pidfilepath\fP option, \fBmongod\fP
creates no PID file.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-keyFile <file>
Specifies the path to a key file to store authentication
information. This option is used for interprocess authentication among
the \fBmongos\fP and \fBmongod\fP instances of a
\fIsharded cluster\fP or \fIreplica set\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-setParameter <options>
New in version 2.4.
.sp
Specifies an option to configure on startup. Specify multiple options
with multiple \fI\-\-setParameter\fP options. See
http://docs.mongodb.org/manual/reference/parameters for full documentation of these parameters.
The \fBsetParameter\fP database command provides access to many
of these parameters. \fI\-\-setParameter\fP supports the following
options:
.INDENT 7.0
.IP \(bu 2
\fBenableLocalhostAuthBypass\fP
.IP \(bu 2
\fBenableTestCommands\fP
.IP \(bu 2
\fBjournalCommitInterval\fP
.IP \(bu 2
\fBlogLevel\fP
.IP \(bu 2
\fBlogUserIds\fP
.IP \(bu 2
\fBnotablescan\fP
.IP \(bu 2
\fBquiet\fP
.IP \(bu 2
\fBreplApplyBatchSize\fP
.IP \(bu 2
\fBreplIndexPrefetch\fP
.IP \(bu 2
\fBsupportCompatibilityFormPrivilegeDocuments\fP
.IP \(bu 2
\fBsyncdelay\fP
.IP \(bu 2
\fBtextSearchEnabled\fP
.IP \(bu 2
\fBtraceExceptions\fP
.IP \(bu 2
\fBsaslauthdPath\fP
.IP \(bu 2
\fBauthenticationMechanisms\fP
.IP \(bu 2
\fBsslMode\fP
.IP \(bu 2
\fBclusterAuthMode\fP
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-httpinterface
New in version 2.6.
.sp
Enables the HTTP interface. Enabling the interface can increase
network exposure.
.sp
Leave the HTTP interface \fIdisabled\fP for production deployments. If you
\fIdo\fP enable this interface, you should only allow trusted clients to
access this port. See \fIsecurity\-firewalls\fP\&.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
In MongoDB Enterprise, the HTTP Console does not support Kerberos
Authentication.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-nohttpinterface
Deprecated since version 2.6: MongoDB disables the HTTP interface by default.
.sp
Disables the HTTP interface.
.sp
Do not use in conjunction with \fI\%\-\-rest\fP or \fI\-\-jsonp\fP\&.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
In MongoDB Enterprise, the HTTP Console does not support Kerberos
Authentication.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-clusterAuthMode <option>
New in version 2.6.
.sp
Enables \fIinternal x.509 authentication\fP for membership to the cluster or replica
set. The \fI\-\-clusterAuthMode\fP option can have one of the
following values:
.TS
center;
|l|l|.
_
T{
Value
T} T{
Description
T}
_
T{
\fBkeyFile\fP
T} T{
Default value. Use keyfile for authentication.
T}
_
T{
\fBsendKeyFile\fP
T} T{
For rolling upgrade purposes. Send the keyfile for
authentication but can accept either keyfile or x.509
certificate.
T}
_
T{
\fBsendX509\fP
T} T{
For rolling upgrade purposes. Send the x.509 certificate for
authentication but can accept either keyfile or x.509
certificate.
T}
_
T{
\fBx509\fP
T} T{
Recommended. Send the x.509 certificate for authentication and
accept \fBonly\fP x.509 certificate.
T}
_
.TE
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-nounixsocket
Disables listening on the UNIX socket. \fBmongod\fP always
listens on the UNIX socket, unless either: \fI\-\-nounixsocket\fP
is set, \fBbind_ip\fP is not set, or \fBbind_ip\fP
does not specify \fB127.0.0.1\fP\&.
.sp
New in version 2.6: \fBmongod\fP installed from official \fB\&.deb\fP and \fB\&.rpm\fP packages
have the \fBbind_ip\fP configuration set to \fB127.0.0.1\fP by
default.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-unixSocketPrefix <path>
Specifies a path for the UNIX socket. If this option has no
value, \fBmongod\fP creates a socket with \fB/tmp\fP as a prefix.
.sp
MongoDB will always create and listen on a UNIX socket, unless
\fI\-\-nounixsocket\fP is set, \fBbind_ip\fP is not set,
or \fBbind_ip\fP does not specify \fB127.0.0.1\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-fork
Enables a \fIdaemon\fP mode for \fBmongod\fP that runs the
process in the background. This is the normal mode of operation in
production and production\-like environments but may not be
desirable for testing.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-auth
Enables database authentication for users connecting from remote
hosts. Configure users via the \fBmongo shell\fP\&. If no users exist, the localhost interface
will continue to have access to the database until the you create
the first user.
.sp
See \fBSecurity and Authentication\fP
for more information.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-noauth
Disables authentication. Currently the default. Exists for future
compatibility and clarity.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ipv6
Enables IPv6 support, which allows \fBmongod\fP to connect to the MongoDB
instance using an IPv6 network. All MongoDB programs and processes,
including \fBmongod\fP, disable IPv6 support by default.
.UNINDENT
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.TP
.B \-\-jsonp
Permits \fIJSONP\fP access via an HTTP interface. Consider the
security implications of allowing this activity before enabling this
option. If the HTTP interface is disabled, the \fI\-\-jsonp\fP also
enables the HTTP interface.
.sp
\fBSEE ALSO:\fP
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.INDENT 3.5
\fI\-\-httpinterface\fP
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.TP
.B \-\-rest
Enables the simple \fIREST\fP API. Consider the security
implications of allowing this activity before enabling this option.
.sp
If the HTTP interface is disabled, the \fI\%\-\-rest\fP setting
also enables the HTTP interface.
.sp
\fBSEE ALSO:\fP
.INDENT 7.0
.INDENT 3.5
\fI\-\-httpinterface\fP to enable the HTTP interface.
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.TP
.B \-\-slowms <value>
Defines the value of "slow," for the \fI\%\-\-profile\fP
option. The database logs all slow queries to the log, even when
the profiler is not turned on. When the database profiler is on,
\fBmongod\fP the profiler writes to the \fBsystem.profile\fP
collection. See the \fBprofile\fP command for more information on the
database profiler.
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.INDENT 0.0
.TP
.B \-\-profile <level>
Changes the level of database profiling, which inserts information
about operation performance into output of \fBmongod\fP or the log
file. The following levels are available:
.TS
center;
|l|l|.
_
T{
\fBLevel\fP
T} T{
\fBSetting\fP
T}
_
T{
0
T} T{
Off. No profiling.
T}
_
T{
1
T} T{
On. Only includes slow operations.
T}
_
T{
2
T} T{
On. Includes all operations.
T}
_
.TE
.sp
Profiling is off by default. Database profiling can impact database
performance. Enable this option only after careful consideration.
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.TP
.B \-\-cpu
Forces \fBmongod\fP to report the percentage of CPU time in
write lock. \fBmongod\fP generates output every four
seconds. MongoDB writes this data to standard output or the logfile
if using the \fBlogpath\fP option.
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.TP
.B \-\-sysinfo
Returns diagnostic system information and then exits. The
information provides the page size, the number of physical pages,
and the number of available physical pages.
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.TP
.B \-\-dbpath <path>
Specifies the directory where the \fBmongod\fP instance stores its
data. Typical locations include: \fB/srv/mongodb\fP, \fB/var/lib/mongodb\fP
or \fB/opt/mongodb\fP
.sp
Unless specified, \fBmongod\fP will look for data files in the default
\fB/data/db\fP directory. (Windows systems use the \fB\edata\edb\fP
directory.) If you installed using a package management system. Check
the \fB/etc/mongodb.conf\fP file provided by your packages to see the
configuration of the \fI\-\-dbpath\fP\&.
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.B \-\-directoryperdb
Alters the storage pattern of the data directory to store each
database\(aqs files in a distinct folder. This option will create
directories within the \fI\-\-dbpath\fP named for each directory.
.sp
Use this option in conjunction with your file system and device
configuration so that MongoDB will store data on a number of distinct
disk devices to increase write throughput or disk capacity.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
If you have an existing \fBmongod\fP instance and
\fBdbpath\fP, and you want to enable
\fI\-\-directoryperdb\fP, you \fBmust\fP migrate your existing
databases to directories before setting \fI\-\-directoryperdb\fP
to access those databases.
.INDENT 0.0
.INDENT 3.5
.SS Example
.sp
Given a \fBdbpath\fP directory with the following items:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
journal
mongod.lock
local.0
local.1
local.ns
test.0
test.1
test.ns
.ft P
.fi
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.UNINDENT
.sp
To enable \fI\-\-directoryperdb\fP you would need to modify the
\fBdbpath\fP to resemble the following:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
journal
mongod.lock
local/local.0
local/local.1
local/local.ns
test/test.0
test/test.1
test/test.ns
.ft P
.fi
.UNINDENT
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.UNINDENT
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.INDENT 0.0
.TP
.B \-\-noIndexBuildRetry
Stops \fBmongod\fP from rebuilding indexes on the next start\-up after the
program had shut down or stopped in the middle of an index build.
.UNINDENT
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.TP
.B \-\-noprealloc
Disables the preallocation of data files. This shortens the
start up time in some cases and can cause significant performance
penalties during normal operations.
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.TP
.B \-\-nssize <value>
Specifies the default size for namespace files (i.e \fB\&.ns\fP). This
option has no impact on the size of existing namespace files. The
maximum size is 2047 megabytes.
.sp
The default value is 16 megabytes, which provides for approximately
24,000 namespaces. Each collection, as well as each index, counts as
a namespace.
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.TP
.B \-\-quota
Enables a maximum limit for the number data files each database can
have. When running with \fI\%\-\-quota\fP, there are a maximum of
8 data files per database. Adjust the quota with the
\fI\%\-\-quotaFiles\fP option.
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.TP
.B \-\-quotaFiles <number>
Modifies the limit on the number of data files per database. This
option requires the \fI\%\-\-quota\fP setting. The default value
for \fI\%\-\-quotaFiles\fP is 8.
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.B \-\-smallfiles
Enables a mode where MongoDB uses a smaller default file
size. Specifically, \fI\%\-\-smallfiles\fP reduces the initial
size for data files and limits them to 512
megabytes. \fI\%\-\-smallfiles\fP also reduces the size of each
\fIjournal\fP files from 1 gigabyte to 128 megabytes.
.sp
Use \fI\%\-\-smallfiles\fP if you have a large number of databases
that each holds a small quantity of data. \fI\%\-\-smallfiles\fP can
lead your \fBmongod\fP to create a large number of files,
which may affect performance for larger databases.
.UNINDENT
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.B \-\-syncdelay <value>
Controls how much time can pass before MongoDB flushes data to the data
files via an \fIfsync\fP operation. \fBDo not set this value on
production systems.\fP In almost every situation you should not set this
value and use the default setting.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
If you set \fI\%\-\-syncdelay\fP to \fB0\fP, MongoDB will not sync the
memory mapped files to disk.
.UNINDENT
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.sp
\fBmongod\fP writes data very quickly to the journal and lazily to the
data files. The default \fBsyncdelay\fP setting is 60 seconds.
\fBsyncdelay\fP has no effect on the \fBjournal\fP files or
\fBjournaling\fP\&.
.sp
The \fBserverStatus\fP command reports the background flush
thread\(aqs status via the \fBbackgroundFlushing\fP field.
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.B \-\-upgrade
Upgrades the on\-disk data format of the files specified by the
\fI\-\-dbpath\fP to the latest version, if needed.
.sp
This option only affects the operation of \fBmongod\fP if the data files
are in an old format.
.sp
In most cases you should \fBnot\fP set this value, so you can exercise the
most control over your upgrade process. See the MongoDB \fI\%release notes\fP (on the download page) for more
information about the upgrade process.
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.B \-\-repair
Runs a repair routine on all databases. This is equivalent
to shutting down and running the \fBrepairDatabase\fP database
command on all databases.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
During normal operations, only use the \fBrepairDatabase\fP
command and wrappers including \fBdb.repairDatabase()\fP in the
\fBmongo\fP shell and \fImongod \-\-repair\fP, to compact
database files and/or reclaim disk space. Be aware that these
operations remove and do not save any corrupt data during the
repair process.
.sp
If you are trying to repair a \fIreplica set\fP member, and you
have access to an intact copy of your data (e.g. a recent backup or
an intact member of the \fIreplica set\fP), you should restore
from that intact copy, and \fBnot\fP use \fBrepairDatabase\fP\&.
.UNINDENT
.UNINDENT
.sp
When using \fIjournaling\fP, there is almost never
any need to run \fBrepairDatabase\fP\&. In the event of an
unclean shutdown, the server will be able restore the data files
to a pristine state automatically.
.sp
Changed in version 2.1.2.
.sp
If you run the repair option \fIand\fP have data in a journal file,
\fBmongod\fP refuses to start. In these cases you should start
\fBmongod\fP without the \fI\-\-repair\fP option to allow \fBmongod\fP
to recover data from the journal. This completes more quickly and is
more likely to produce valid data files. To continue the repair
operation despite the journal files, shut down \fBmongod\fP cleanly and
restart with the \fI\-\-repair\fP option.
.sp
\fI\-\-repair\fP copies data from the source data files into new data
files in the \fBrepairpath\fP, and then replaces the original data
files with the repaired data files. \fIIf\fP \fBrepairpath\fP is on the
same device as \fBdbpath\fP, you \fImay\fP interrupt a \fBmongod\fP
running \fI\-\-repair\fP without affecting the integrity of the data
set.
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.B \-\-repairpath <path>
Specifies the root directory containing MongoDB data files to use
for the \fI\-\-repair\fP operation. Defaults to a \fB_tmp\fP
directory within the \fBdbpath\fP\&.
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.B \-\-objcheck
Forces the \fBmongod\fP to validate all requests from clients upon
receipt to ensure that clients never insert invalid documents into the
database. For objects with a high degree of sub\-document nesting,
\fI\-\-objcheck\fP can have a small impact on performance. You can set
\fI\-\-noobjcheck\fP to disable object checking at runtime.
.sp
Changed in version 2.4: MongoDB enables \fI\-\-objcheck\fP by default, to prevent any
client from inserting malformed or invalid BSON into a MongoDB
database.
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.B \-\-noobjcheck
New in version 2.4.
.sp
Disables the default document validation that MongoDB performs on all
incoming BSON documents.
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.B \-\-noscripting
Disables the scripting engine.
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.B \-\-notablescan
Forbids operations that require a table scan.
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.B \-\-journal
Enables operation journaling to ensure write durability and data file
validity. \fBmongod\fP enables journaling by default on
64\-bit builds of versions after 2.0.
.UNINDENT
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.TP
.B \-\-nojournal
Disables the durability journaling. By default, \fBmongod\fP
enables journaling in 64\-bit versions after v2.0.
.UNINDENT
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.TP
.B \-\-journalOptions <arguments>
Provides functionality for testing. Not for general use, and will affect data
file integrity in the case of abnormal system shutdown.
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.TP
.B \-\-journalCommitInterval <value>
Specifies the maximum amount of time for \fBmongod\fP to allow
between journal operations. Possible values are between 2 and 300
milliseconds. Lower values increase the durability of the journal,
at the expense of disk performance.
.sp
The default journal commit interval is 100 milliseconds if a single
block device (e.g. physical volume, RAID device, or LVM volume)
contains both the journal and the data files.
.sp
If the journal is on a different block device than the data files the
default journal commit interval is 30 milliseconds.
.sp
To force \fBmongod\fP to commit to the journal more frequently,
you can specify \fBj:true\fP\&. When a write operation with \fBj:true\fP
is pending, \fBmongod\fP will reduce
\fBjournalCommitInterval\fP to a third of the set value.
.UNINDENT
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.TP
.B \-\-shutdown
Used in \fIcontrol scripts\fP, the
\fI\%\-\-shutdown\fP cleanly and safely terminates the \fBmongod\fP
process. When invoking \fBmongod\fP with this option you must set the
\fI\-\-dbpath\fP option either directly or by way of the
\fBconfiguration file\fP and the
\fI\-\-config\fP option.
.sp
The \fI\%\-\-shutdown\fP option is available only on Linux systems.
.UNINDENT
.SS Replication Options
.INDENT 0.0
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.B \-\-replSet <setname>
Configures replication. Specify a replica set name as an argument to
this set. All hosts in the replica set must have the same set name.
.sp
\fBIMPORTANT:\fP
.INDENT 7.0
.INDENT 3.5
If your application connects to more than one replica set, each set
should have a distinct name. Some drivers group replica set
connections by replica set name.
.UNINDENT
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.B \-\-oplogSize <value>
Specifies a maximum size in megabytes for the replication operation log
(e.g. \fIoplog\fP\&.) By \fBmongod\fP creates an \fIoplog\fP based on
the maximum amount of space available. For 64\-bit systems, the op log is
typically 5% of available disk space. Once the \fBmongod\fP has created
the oplog for the first time, changing \fI\%\-\-oplogSize\fP will not
affect the size of the oplog.
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.B \-\-replIndexPrefetch
New in version 2.2.
.sp
You must use \fI\%\-\-replIndexPrefetch\fP in conjunction with
\fBreplSet\fP\&. The default value is \fBall\fP and available
options are:
.INDENT 7.0
.IP \(bu 2
\fBnone\fP
.IP \(bu 2
\fBall\fP
.IP \(bu 2
\fB_id_only\fP
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.sp
By default \fIsecondary\fP members of a \fIreplica set\fP will load
all indexes related to an operation into memory before applying
operations from the oplog. You can modify this behavior so that the
secondaries will only load the \fB_id\fP index. Specify \fB_id_only\fP or
\fBnone\fP to prevent the \fBmongod\fP from loading \fIany\fP index into
memory.
.UNINDENT
.SS Master\-Slave Replication
.sp
These options provide access to conventional master\-slave database
replication. While this functionality remains accessible in MongoDB,
replica sets are the preferred configuration for database replication.
.INDENT 0.0
.TP
.B \-\-master
Configures \fBmongod\fP to run as a replication \fImaster\fP\&.
.UNINDENT
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.TP
.B \-\-slave
Configures \fBmongod\fP to run as a replication \fIslave\fP\&.
.UNINDENT
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.B \-\-source <host><:port>
For use with the \fI\%\-\-slave\fP option, the \fB\-\-source\fP option
designates the server that this instance will replicate.
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.TP
.B \-\-only <arg>
For use with the \fI\%\-\-slave\fP option, the \fB\-\-only\fP option
specifies only a single \fIdatabase\fP to replicate.
.UNINDENT
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.TP
.B \-\-slavedelay <value>
For use with the \fI\%\-\-slave\fP option, the \fB\-\-slavedelay\fP
option configures a "delay" in seconds, for this slave to wait to
apply operations from the \fImaster\fP node.
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.TP
.B \-\-autoresync
For use with the \fI\%\-\-slave\fP option. When set,
\fI\%\-\-autoresync\fP option allows this slave to automatically