‘mongod --help' or ‘mongod -h' command prints the usage information of mongod command.
$mongod -h
Options:
--networkMessageCompressors arg (=snappy,zstd,zlib)
Comma-separated list of compressors to
use for network messages
General options:
-h [ --help ] Show this usage information
--version Show version information
-f [ --config ] arg Configuration file specifying
additional options
--configExpand arg Process expansion directives in config
file (none, exec, rest)
--port arg Specify port number - 27017 by default
--ipv6 Enable IPv6 support (disabled by
default)
--listenBacklog arg (=128) Set socket listen backlog size
--maxConns arg (=1000000) Max number of simultaneous connections
--pidfilepath arg Full path to pidfile (if not set, no
pidfile is created)
--timeZoneInfo arg Full path to time zone info directory,
e.g. /usr/share/zoneinfo
--nounixsocket Disable listening on unix sockets
--unixSocketPrefix arg Alternative directory for UNIX domain
sockets (defaults to /tmp)
--filePermissions arg Permissions to set on UNIX domain
socket file - 0700 by default
--fork Fork server process
-v [ --verbose ] [=arg(=v)] Be more verbose (include multiple times
for more verbosity e.g. -vvvvv)
--quiet Quieter output
--logpath arg Log file to send write to instead of
stdout - has to be a file, not
directory
--syslog Log to system's syslog facility instead
of file or stdout
--syslogFacility arg syslog facility used for mongodb syslog
message
--logappend Append to logpath instead of
over-writing
--logRotate arg Set the log rotation behavior
(rename|reopen)
--timeStampFormat arg Desired format for timestamps in log
messages. One of iso8601-utc or
iso8601-local
--setParameter arg Set a configurable parameter
--bind_ip arg Comma separated list of ip addresses to
listen on - localhost by default
--bind_ip_all Bind to all ip addresses
--noauth Run without security
--transitionToAuth For rolling access control upgrade.
Attempt to authenticate over outgoing
connections and proceed regardless of
success. Accept incoming connections
with or without authentication.
--slowms arg (=100) Value of slow for profile and console
log
--slowOpSampleRate arg (=1) Fraction of slow ops to include in the
profile and console log
--profileFilter arg Query predicate to control which
operations are logged and profiled
--auth Run with security
--clusterIpSourceWhitelist arg Network CIDR specification of permitted
origin for `__system` access
--profile arg 0=off 1=slow, 2=all
--cpu Periodically show cpu and iowait
utilization
--sysinfo Print some diagnostic system
information
--noscripting Disable scripting engine
--notablescan Do not allow table scans
--keyFile arg Private key for cluster authentication
--clusterAuthMode arg Authentication mode used for cluster
authentication. Alternatives are
(keyFile|sendKeyFile|sendX509|x509)
Replication options:
--oplogSize arg Size to use (in MB) for replication op
log. default is 5% of disk space (i.e.
large is good)
Replica set options:
--replSet arg arg is <setname>[/<optionalseedhostlist
>]
--enableMajorityReadConcern [=arg(=1)] (=1)
Enables majority readConcern
Sharding options:
--configsvr Declare this is a config db of a
cluster; default port 27019; default
dir /data/configdb
--shardsvr Declare this is a shard db of a
cluster; default port 27018
Storage options:
--storageEngine arg What storage engine to use - defaults
to wiredTiger if no data files present
--dbpath arg Directory for datafiles - defaults to
/data/db
--directoryperdb Each database will be stored in a
separate directory
--syncdelay arg (=60) Seconds between disk syncs
--journalCommitInterval arg (=100) how often to group/batch commit (ms)
--upgrade Upgrade db if needed
--repair Run repair on all dbs
--journal Enable journaling
--nojournal Disable journaling (journaling is on by
default for 64 bit)
--oplogMinRetentionHours arg (=0) Minimum number of hours to preserve in
the oplog. Default is 0 (turned off).
Fractions are allowed (e.g. 1.5 hours)
TLS Options:
--tlsOnNormalPorts Use TLS on configured ports
--tlsMode arg Set the TLS operation mode
(disabled|allowTLS|preferTLS|requireTLS
)
--tlsCertificateKeyFile arg Certificate and key file for TLS
--tlsCertificateKeyFilePassword arg Password to unlock key in the TLS
certificate key file
--tlsClusterFile arg Key file for internal TLS
authentication
--tlsClusterPassword arg Internal authentication key file
password
--tlsCAFile arg Certificate Authority file for TLS
--tlsClusterCAFile arg CA used for verifying remotes during
inbound connections
--tlsCRLFile arg Certificate Revocation List file for
TLS
--tlsDisabledProtocols arg Comma separated list of TLS protocols
to disable [TLS1_0,TLS1_1,TLS1_2]
--tlsAllowConnectionsWithoutCertificates
Allow client to connect without
presenting a certificate
--tlsAllowInvalidHostnames Allow server certificates to provide
non-matching hostnames
--tlsAllowInvalidCertificates Allow connections to servers with
invalid certificates
--tlsFIPSMode Activate FIPS 140-2 mode at startup
--tlsCertificateSelector arg TLS Certificate in system store
--tlsClusterCertificateSelector arg SSL/TLS Certificate in system store for
internal TLS authentication
--tlsLogVersions arg Comma separated list of TLS protocols
to log on connect [TLS1_0,TLS1_1,TLS1_2
]
WiredTiger options:
--wiredTigerCacheSizeGB arg Maximum amount of memory to allocate
for cache; Defaults to 1/2 of physical
RAM
--wiredTigerJournalCompressor arg (=snappy)
Use a compressor for log records
[none|snappy|zlib|zstd]
--wiredTigerDirectoryForIndexes Put indexes and data in different
directories
--wiredTigerCollectionBlockCompressor arg (=snappy)
Block compression algorithm for
collection data [none|snappy|zlib|zstd]
--wiredTigerIndexPrefixCompression arg (=1)
Use prefix compression on row-store
leaf pages
Free Monitoring Options:
--enableFreeMonitoring arg Enable Cloud Free Monitoring
(on|runtime|off)
--freeMonitoringTag arg Cloud Free Monitoring Tags
AWS IAM Options:
--awsIamSessionToken arg AWS Session Token for temporary
credentials
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