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.\" Documentation for the MongoDB shell
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.TH MONGOD "1" "June 2009" "10gen" "Mongo Database"
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mongod \- the Mongo Daemon
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is a core MongoDB daemon. You are not supposed to call it directly, please refer to the wiki if necessary.
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Copyright 2007\-2009 10gen
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For more information, please refer to the MongoDB wiki, available at http://www.mongodb.org.
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.TH "MONGOD" "1" "March 14, 2013" "2.2.3" "mongodb-manual"
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mongod \- MongoDB Server
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.\" Man page generated from reStructuredText.
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\fI\%mongod\fP is the primary daemon process for the MongoDB
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system. It handles data requests, manages data format, and performs
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background management operations.
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This document provides a complete overview of all command line options
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for \fI\%mongod\fP. These options are primarily useful for testing
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purposes. In common operation, use the \fBconfiguration file
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options\fP to control the behavior of
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your database, which is fully capable of all operations described
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Returns a basic help and usage text.
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Returns the version of the \fI\%mongod\fP daemon.
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.B \-\-config <filename>, \-f <filename>
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Specifies a configuration file, that you can use to specify
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runtime\-configurations. While the options are equivalent and
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accessible via the other command line arguments, the configuration
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file is the preferred method for runtime configuration of
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mongod. See the "\fB/reference/configuration\-options\fP" document
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for more information about these options.
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Increases the amount of internal reporting returned on standard
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output or in the log file specified by \fI\%--logpath\fP. Use the
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\fB\-v\fP form to control the level of verbosity by including the
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option multiple times, (e.g. \fB\-vvvvv\fP.)
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Runs the \fI\%mongod\fP instance in a quiet mode that attempts to limit
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the amount of output. This option suppresses:
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output from \fIdatabase commands\fP,
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including \fBdrop\fP, \fBdropIndexes\fP,
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\fBdiagLogging\fP, \fBvalidate\fP, and
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connection accepted events.
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connection closed events.
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Specifies a TCP port for the \fI\%mongod\fP to listen for client
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connections. By default \fI\%mongod\fP listens for connections on
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UNIX\-like systems require root privileges to use ports with numbers
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.B \-\-bind_ip <ip address>
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The IP address that the \fI\%mongod\fP process will bind to and
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listen for connections. By default \fI\%mongod\fP listens for
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connections on the localhost (i.e. \fB127.0.0.1\fP address.) You may
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attach \fI\%mongod\fP to any interface; however, if you attach
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\fI\%mongod\fP to a publicly accessible interface ensure that
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you have implemented proper authentication and/or firewall
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restrictions to protect the integrity of your database.
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.B \-\-maxConns <number>
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Specifies the maximum number of simultaneous connections that
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\fI\%mongod\fP will accept. This setting will have no effect if
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it is higher than your operating system\(aqs configured maximum
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connection tracking threshold.
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You cannot set \fBmaxConns\fP to a value higher
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Forces the \fI\%mongod\fP to validate all requests from clients
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upon receipt to ensure that clients never insert invalid documents
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into the database. For objects with a high degree of sub\-document
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nesting, \fI\%--objcheck\fP can have a small impact on
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performance. You can set \fI\%--noobjcheck\fP to disable object
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checking at run\-time.
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Changed in version 2.4: MongoDB enables \fI\%--objcheck\fP by default, to prevent any
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client from inserting malformed or invalid BSON into a MongoDB
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Disables the default document validation that MongoDB performs on all
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incoming BSON documents.
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.B \-\-logpath <path>
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Specify a path for the log file that will hold all diagnostic
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Unless specified, \fI\%mongod\fP will output all log information
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to the standard output. Additionally, unless you also specify
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\fI\%--logappend\fP, the logfile will be overwritten when the
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The behavior of the logging system may change in the near
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future in response to the \fI\%SERVER-4499\fP case.
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When specified, this option ensures that \fI\%mongod\fP appends
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new entries to the end of the logfile rather than overwriting the
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content of the log when the process restarts.
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New in version 2.1.0.
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Sends all logging output to the host\(aqs \fIsyslog\fP system rather
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than to standard output or a log file as with \fI\%--logpath\fP.
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You cannot use \fI\%--syslog\fP with \fI\%--logpath\fP.
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.B \-\-pidfilepath <path>
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Specify a file location to hold the "\fIPID\fP" or process ID of
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the \fI\%mongod\fP process. Useful for tracking the
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\fI\%mongod\fP process in combination with the \fI\%mongod --fork\fP
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Without a specified \fI\%--pidfilepath\fP option,
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\fBmongos\fP creates no PID file.
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.B \-\-keyFile <file>
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Specify the path to a key file to store authentication
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information. This option is only useful for the connection between
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"\fIReplica Set Security\fP"
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and "\fB/administration/replica\-sets\fP."
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Disables listening on the UNIX socket. Unless set to false,
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\fI\%mongod\fP and \fBmongos\fP provide a UNIX\-socket.
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.B \-\-unixSocketPrefix <path>
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Specifies a path for the UNIX socket. Unless this option has a
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value, \fI\%mongod\fP and \fBmongos\fP, create a socket
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with the \fB/tmp\fP as a prefix.
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Enables a \fIdaemon\fP mode for \fI\%mongod\fP that runs the
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process to the background. This is the normal mode of operation, in
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production and production\-like environments, but may \fInot\fP be
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desirable for testing.
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Enables database authentication for users connecting from remote
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hosts. configure users via the \fBmongo shell shell\fP. If no users exist, the localhost interface
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will continue to have access to the database until the you create
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See the \fBSecurity and Authentication\fP
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page for more information regarding this functionality.
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Forces \fI\%mongod\fP to report the percentage of CPU time in
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write lock. \fI\%mongod\fP generates output every four
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seconds. MongoDB writes this data to standard output or the logfile
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if using the \fBlogpath\fP option.
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Specify a directory for the \fI\%mongod\fP instance to store its
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data. Typical locations include: \fB/srv/mongodb\fP,
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\fB/var/lib/mongodb\fP or \fB/opt/mongodb\fP
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Unless specified, \fI\%mongod\fP will look for data files in the
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default \fB/data/db\fP directory. (Windows systems use the
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\fB\edata\edb\fP directory.) If you installed using a package
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management system. Check the \fB/etc/mongodb.conf\fP file provided by
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your packages to see the configuration of the \fBdbpath\fP.
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.B \-\-diaglog <value>
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Creates a very verbose, \fIdiagnostic log\fP for troubleshooting
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and recording various errors. MongoDB writes these log files in the
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\fBdbpath\fP directory in a series of files that begin with
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the string \fBdiaglog\fP and end with the initiation time of the
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logging as a hex string.
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The specified value configures the level of verbosity. Possible
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values, and their impact are as follows.
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Log write operations.
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Log both read and write operations.
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Log write and some read operations.
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You can use the \fBmongosniff\fP tool to replay this output
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for investigation. Given a typical diaglog file, located at
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\fB/data/db/diaglog.4f76a58c\fP, you might use a command in the
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following form to read these files:
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mongosniff \-\-source DIAGLOG /data/db/diaglog.4f76a58c
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\fI\%--diaglog\fP is for internal use and not intended for most
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Setting the diagnostic level to \fB0\fP will cause \fI\%mongod\fP
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to stop writing data to the \fIdiagnostic log\fP file. However,
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the \fI\%mongod\fP instance will continue to keep the file open,
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even if it is no longer writing data to the file. If you want to
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rename, move, or delete the diagnostic log you must cleanly shut
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down the \fI\%mongod\fP instance before doing so.
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.B \-\-directoryperdb
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Alters the storage pattern of the data directory to store each
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database\(aqs files in a distinct folder. This option will create
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directories within the \fI\%--dbpath\fP named for each directory.
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Use this option in conjunction with your file system and device
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configuration so that MongoDB will store data on a number of
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distinct disk devices to increase write throughput or disk
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Enables operation journaling to ensure write durability and data
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consistency. \fI\%mongod\fP enables journaling by default on
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64\-bit builds of versions after 2.0.
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.B \-\-journalOptions <arguments>
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Provides functionality for testing. Not for general use, and may
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affect database integrity.
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.B \-\-journalCommitInterval <value>
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Specifies the maximum amount of time for \fI\%mongod\fP to allow
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between journal operations. The default value is 100 milliseconds,
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while possible values range from 2 to 300 milliseconds. Lower
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values increase the durability of the journal, at the expense of
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To force \fI\%mongod\fP to commit to the journal more frequently,
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you can specify \fBj:true\fP. When a write operation with \fBj:true\fP
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pending, \fI\%mongod\fP will reduce
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\fBjournalCommitInterval\fP to a third of the set value.
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Specify this option to enable IPv6 support. This will allow clients
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to connect to \fI\%mongod\fP using IPv6
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networks. \fI\%mongod\fP disables IPv6 support by default in
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\fI\%mongod\fP and all utilities.
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Permits \fIJSONP\fP access via an HTTP interface. Consider the
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security implications of allowing this activity before enabling
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Disable authentication. Currently the default. Exists for future
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compatibility and clarity.
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.B \-\-nohttpinterface
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Disables the HTTP interface.
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Disables the durability journaling. By default, \fI\%mongod\fP
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enables journaling in 64\-bit versions after v2.0.
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Disables the preallocation of data files. This will shorten the
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start up time in some cases, but can cause significant performance
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penalties during normal operations.
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Disables the scripting engine.
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Forbids operations that require a table scan.
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.B \-\-nssize <value>
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Specifies the default size for namespace files (i.e \fB.ns\fP). This
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option has no impact on the size of existing namespace files. The
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maximum size is 2047 megabytes.
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The default value is 16 megabytes; this provides for approximately
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24,000 namespaces. Each collection, as well as each index, counts as
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.B \-\-profile <level>
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Changes the level of database profiling, which inserts information
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about operation performance into output of \fI\%mongod\fP or the log
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file. The following levels are available:
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On. Only includes slow operations.
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On. Includes all operations.
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Profiling is off by default. Database profiling can impact database
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performance. Enable this option only after careful consideration.
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Enables a maximum limit for the number data files each database can
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have. When running with \fI\%--quota\fP, there are a maximum of
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8 data files per database. Adjust the quota with the
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\fI\%--quotaFiles\fP option.
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.B \-\-quotaFiles <number>
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Modify limit on the number of data files per database. This option
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requires the \fI\%--quota\fP setting. The default value for
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\fI\%--quotaFiles\fP is 8.
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Enables the simple \fIREST\fP API.
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Runs a repair routine on all databases. This is equivalent
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to shutting down and running the \fBrepairDatabase\fP database
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command on all databases.
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In general, if you have an intact copy of your data, such as
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would exist on a very recent backup or an intact member of a
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\fIreplica set\fP, \fBdo not\fP use \fBrepairDatabase\fP
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or related options like \fBdb.repairDatabase()\fP in the
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\fBmongo\fP shell or \fI\%mongod --repair\fP. Restore
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from an intact copy of your data.
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When using \fIjournaling\fP, there is almost never
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any need to run \fBrepairDatabase\fP. In the event of an
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unclean shutdown, the server will be able restore the data files
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to a pristine state automatically.
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Changed in version 2.1.2.
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If you run the repair option \fIand\fP have data in a journal file,
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\fI\%mongod\fP will refuse to start. In these cases you should
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start \fI\%mongod\fP without the \fI\%--repair\fP option to
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allow \fI\%mongod\fP to recover data from the journal. This will
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complete more quickly and will result in a more consistent and
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To continue the repair operation despite the journal files, shut down
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\fI\%mongod\fP cleanly and restart with the \fI\%--repair\fP
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\fI\%--repair\fP copies data from the source data files into
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new data files in the \fBrepairpath\fP, and then replaces
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the original data files with the repaired data files. \fIIf\fP
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\fBrepairpath\fP is on the same device as
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\fBdbpath\fP, you \fImay\fP interrupt a \fI\%mongod\fP
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running \fI\%--repair\fP without affecting the integrity of
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.B \-\-repairpath <path>
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Specifies the root directory containing MongoDB data files, to use
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for the \fI\%--repair\fP operation. Defaults to a \fB_tmp\fP
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directory within the \fBdbpath\fP.
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.B \-\-setParameter <options>
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Specifies an option to configure on startup. Specify multiple
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options with multiple \fI\%--setParameter\fP options. See
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\fB/reference/parameters\fP for full documentation of these
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parameters. The \fBsetParameter\fP database command provides
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access to many of these parameters. \fI\%--setParameter\fP supports the
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\fBenableLocalhostAuthBypass\fP
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\fBenableTestCommands\fP
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\fBjournalCommitInterval\fP
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\fBreplApplyBatchSize\fP
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\fBreplIndexPrefetch\fP
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\fBsupportCompatibilityFormPrivilegeDocuments\fP
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\fBtraceExceptions\fP
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.B \-\-slowms <value>
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Defines the value of "slow," for the \fI\%--profile\fP
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option. The database logs all slow queries to the log, even when
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the profiler is not turned on. When the database profiler is on,
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\fI\%mongod\fP the profiler writes to the \fBsystem.profile\fP
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collection. See the \fBprofile\fP command for more information on the
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Enables a mode where MongoDB uses a smaller default file
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size. Specifically, \fI\%--smallfiles\fP reduces the initial
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size for data files and limits them to 512
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megabytes. \fI\%--smallfiles\fP also reduces the size of each
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\fIjournal\fP files from 1 gigabyte to 128 megabytes.
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Use \fI\%--smallfiles\fP if you have a large number of databases
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that each holds a small quantity of data. \fI\%--smallfiles\fP can
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lead your \fI\%mongod\fP to create a large number of files,
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which may affect performance for larger databases.
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Used in \fIcontrol scripts\fP, the
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\fI\%--shutdown\fP will cleanly and safely terminate the
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\fI\%mongod\fP process. When invoking \fI\%mongod\fP with this
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option you must set the \fI\%--dbpath\fP option either directly
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or by way of the \fBconfiguration file\fP and the \fI\%--config\fP
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\fI\%--shutdown\fP is only available on Linux systems.
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.B \-\-syncdelay <value>
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\fI\%mongod\fP writes data very quickly to the journal, and
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lazily to the data files. \fI\%--syncdelay\fP controls how much
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time can pass before MongoDB flushes data to the \fIdatabase files\fP
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via an \fIfsync\fP operation. The default setting is 60 seconds.
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In almost every situation you should not set this value and use the
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The \fBserverStatus\fP command reports the background flush
629
thread\(aqs status via the \fBbackgroundFlushing\fP
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\fBsyncdelay\fP has no effect on the \fBjournal\fP
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files or \fBjournaling\fP.
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If you set \fI\%--syncdelay\fP to \fB0\fP, MongoDB will not
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sync the memory mapped files to disk. Do not set this value on
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Returns diagnostic system information and then exits. The
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information provides the page size, the number of physical pages,
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and the number of available physical pages.
650
Upgrades the on\-disk data format of the files specified by the
651
\fI\%--dbpath\fP to the latest version, if needed.
653
This option only affects the operation of \fI\%mongod\fP if the
654
data files are in an old format.
656
In most cases you should \fBnot\fP set this value, so you can
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exercise the most control over your upgrade process. See the MongoDB
658
\fI\%release notes\fP (on the
659
download page) for more information about the upgrade process.
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.B \-\-traceExceptions
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For internal diagnostic use only.
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.SS Replication Options
670
.B \-\-replSet <setname>
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Use this option to configure replication with replica sets. Specify
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a setname as an argument to this set. All hosts must have the same
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"\fB/replication\fP,"
677
"\fB/administration/replica\-sets\fP," and
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"\fB/reference/replica\-configuration\fP"
683
.B \-\-oplogSize <value>
684
Specifies a maximum size in megabytes for the replication operation
685
log (e.g. \fIoplog\fP.) By \fI\%mongod\fP creates an
686
\fIoplog\fP based on the maximum amount of space available. For
687
64\-bit systems, the op log is typically 5% of available disk space.
689
Once the \fI\%mongod\fP has created the oplog for the first
690
time, changing \fI\%--oplogSize\fP will not affect the size of
696
In the context of \fIreplica set\fP replication, set this option
697
if you have seeded this member with a snapshot of the
698
\fIdbpath\fP of another member of the set. Otherwise the
699
\fI\%mongod\fP will attempt to perform an initial sync,
700
as though the member were a new member.
702
If the data is not perfectly synchronized \fIand\fP
703
\fI\%mongod\fP starts with \fBfastsync\fP, then the
704
secondary or slave will be permanently out of sync with the
705
primary, which may cause significant consistency problems.
710
.B \-\-replIndexPrefetch
713
You must use \fI\%--replIndexPrefetch\fP in conjunction with
714
\fBreplSet\fP. The default value is \fBall\fP and available
725
By default \fIsecondary\fP members of a \fIreplica set\fP will
726
load all indexes related to an operation into memory before
727
applying operations from the oplog. You can modify this behavior so
728
that the secondaries will only load the \fB_id\fP index. Specify
729
\fB_id_only\fP or \fBnone\fP to prevent the \fI\%mongod\fP from
730
loading \fIany\fP index into memory.
732
.SS Master\-Slave Replication
734
These options provide access to conventional master\-slave database
735
replication. While this functionality remains accessible in MongoDB,
736
replica sets are the preferred configuration for database replication.
740
Configures \fI\%mongod\fP to run as a replication
746
Configures \fI\%mongod\fP to run as a replication
751
.B \-\-source <host><:port>
752
For use with the \fI\%--slave\fP option, the \fB\-\-source\fP option
753
designates the server that this instance will replicate.
758
For use with the \fI\%--slave\fP option, the \fB\-\-only\fP option
759
specifies only a single \fIdatabase\fP to replicate.
763
.B \-\-slavedelay <value>
764
For use with the \fI\%--slave\fP option, the \fB\-\-slavedelay\fP
765
option configures a "delay" in seconds, for this slave to wait to
766
apply operations from the \fImaster\fP node.
771
For use with the \fI\%--slave\fP option, the
772
\fI\%--autoresync\fP option allows this slave to automatically
773
resync if the local data is more than 10 seconds behind the
774
master. This option may be problematic if the \fIoplog\fP is too
775
small (controlled by the \fI\%--oplogSize\fP option.) If the
776
\fIoplog\fP not large enough to store the difference in changes
777
between the master\(aqs current state and the state of the slave, this
778
node will forcibly resync itself unnecessarily. When you set the If
779
the \fI\%--autoresync\fP option the slave will not attempt an
780
automatic resync more than once in a ten minute period.
782
.SS Sharding Cluster Options
786
Declares that this \fI\%mongod\fP instance serves as the
787
\fIconfig database\fP of a sharded cluster. When running with
788
this option, clients will not be able to write data to any database
789
other than \fBconfig\fP and \fBadmin\fP. The default port for
790
\fI\%mongod\fP with this option is \fB27019\fP and
791
\fI\%mongod\fP writes all data files to the \fB/configdb\fP
792
sub\-directory of the \fI\%--dbpath\fP directory.
797
Configures this \fI\%mongod\fP instance as a shard in a
798
partitioned cluster. The default port for these instances is
799
\fB27018\fP. The only effect of \fI\%--shardsvr\fP is to change
804
.B \-\-noMoveParanoia
805
Disables a "paranoid mode" for data writes for chunk migration
807
\fIchunk migration\fP
808
and \fBmoveChunk\fP command documentation for more information.
810
By default \fI\%mongod\fP will save copies of migrated chunks on
811
the "from" server during migrations as "paranoid mode." Setting
812
this option disables this paranoia.
817
\fB/administration/ssl\fP for full documentation of
818
MongoDB\(aqs support.
822
.B \-\-sslOnNormalPorts
825
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
826
for SSL. To use SSL you can either compile MongoDB with SSL
827
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
828
more information about SSL and MongoDB.
831
Enables SSL for \fI\%mongod\fP. With \fI\%--sslOnNormalPorts\fP,
832
a \fI\%mongod\fP requires SSL encryption for all connections on the
833
default MongoDB port, or the port specified by \fI\%--port\fP. By
834
default, \fI\%--sslOnNormalPorts\fP is disabled.
838
.B \-\-sslPEMKeyFile <filename>
841
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
842
for SSL. To use SSL you can either compile MongoDB with SSL
843
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
844
more information about SSL and MongoDB.
847
Specifies the \fB.pem\fP file that contains both the SSL
848
certificate and key. Specify the file name of the \fB.pem\fP
849
file using relative or absolute paths
851
When using \fI\%--sslOnNormalPorts\fP, you must specify
852
\fI\%--sslPEMKeyFile\fP.
856
.B \-\-sslPEMKeyPassword <value>
859
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
860
for SSL. To use SSL you can either compile MongoDB with SSL
861
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
862
more information about SSL and MongoDB.
865
Specifies the password to de\-crypt the certificate\-key file
866
(i.e. \fI\%--sslPEMKeyFile\fP). Only use
867
\fI\%--sslPEMKeyPassword\fP if the certificate\-key file is
868
encrypted. In all cases, \fI\%mongod\fP will redact the password from
869
all logging and reporting output.
871
Changed in version 2.4: \fI\%--sslPEMKeyPassword\fP is only needed when the private
872
key is encrypted. In earlier versions \fI\%mongod\fP would require
873
\fI\%--sslPEMKeyPassword\fP whenever using
874
\fI\%--sslOnNormalPorts\fP, even when the private key was not
879
.B \-\-sslCAFile <filename>
882
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
883
for SSL. To use SSL you can either compile MongoDB with SSL
884
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
885
more information about SSL and MongoDB.
888
Specifies the \fB.pem\fP file that contains the root certificate
889
chain from the Certificate Authority. Specify the file name of the \fB.pem\fP
890
file using relative or absolute paths
894
.B \-\-sslCRLFile <filename>
897
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
898
for SSL. To use SSL you can either compile MongoDB with SSL
899
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
900
more information about SSL and MongoDB.
903
Specifies the \fB.pem\fP file that contains the Certificate
904
Revocation List. Specify the file name of the \fB.pem\fP
905
file using relative or absolute paths
909
.B \-\-sslWeakCertificateValidation
912
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
913
for SSL. To use SSL you can either compile MongoDB with SSL
914
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
915
more information about SSL and MongoDB.
918
Disables the requirement for SSL certificate validation, that
919
\fI\%--sslCAFile\fP enables. With
920
\fI\%--sslWeakCertificateValidation\fP, \fI\%mongod\fP will accept
921
connections if the client does not present a certificate when
922
establishing the connection.
924
If the client presents a certificate and \fI\%mongod\fP has
925
\fI\%--sslWeakCertificateValidation\fP enabled, \fI\%mongod\fP
926
will validate the certificate using the root certificate chain
927
specified by \fI\%--sslCAFile\fP, and reject clients with invalid
930
Use \fI\%--sslWeakCertificateValidation\fP if you have a mixed
931
deployment that includes clients that do not or cannot present
932
certificates to \fI\%mongod\fP.
939
The \fI\%default distribution of MongoDB\fP does \fBnot\fP contain support
940
for SSL. To use SSL you can either compile MongoDB with SSL
941
support or use the MongoDB Subscriber Edition. See \fB/administration/ssl\fP for
942
more information about SSL and MongoDB.
945
When specified, \fI\%mongod\fP will use the FIPS mode of the
946
installed OpenSSL library. Your system must have a FIPS compliant
947
OpenSSL library to use \fI\%--sslFIPSMode\fP.
951
In common usage, the invocation of \fI\%mongod\fP will resemble the
952
following in the context of an initialization or control script:
956
mongod \-\-config /etc/mongodb.conf
960
See the "\fB/reference/configuration\-options\fP" for more information
961
on how to configure \fI\%mongod\fP using the configuration file.
963
MongoDB Documentation Project
965
2011-2013, 10gen, Inc.
966
.\" Generated by docutils manpage writer.
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debian/manpages/mongod.1
