mongo¶

Core Options¶

--shell¶

Enables the shell interface. If you invoke the mongo command and specify a JavaScript file as an argument, or use --eval to specify JavaScript on the command line, the --shell option provides the user with a shell prompt after the file finishes executing.

--nodb¶

Prevents the shell from connecting to any database instances. Later, to connect to a database within the shell, see Opening New Connections.

--norc¶

Prevents the shell from sourcing and evaluating ~/.mongorc.js on start up.

--quiet¶

Silences output from the shell during the connection process.

--port <port>¶

Specifies the port where the mongod or mongos instance is listening. If --port is not specified, mongo attempts to connect to port 27017.

--host <hostname>¶

Specifies the name of the host machine where the mongod or mongos is running. If this is not specified, mongo attempts to connect to a MongoDB process running on the localhost.

To connect to a replica set,

Specify the replica set name and a seed list of set members. Use the following form:

<replSetName>/<hostname1><:port>,<hostname2><:port>,<...>

For TLS/SSL connections (--ssl),

The mongo shell verifies that the hostname (specified in --host option or the connection string) matches the SAN (or, if SAN is not present, the CN) in the certificate presented by the mongod or mongos. If SAN is present, mongo does not match against the CN. If the hostname does not match the SAN (or CN), the mongo shell will fail to connect.

Starting in MongoDB 4.2, when performing comparison of SAN, MongoDB supports comparison of DNS names or IP addresses. In previous versions, MongoDB only supports comparisons of DNS names.

For DNS seedlist connections,

Specify the connection protocol as mongodb+srv, followed by the DNS SRV hostname record and any options. The authSource and replicaSet options, if included in the connection string, will override any corresponding DNS-configured options set in the TXT record. Use of the mongodb+srv: connection string implicitly enables TLS/SSL (normally set with ssl=true) for the client connection. The TLS/SSL option can be turned off by setting ssl=false in the query string.

Example:

mongodb+srv://server.example.com/?connectionTimeout=3000ms

New in version 3.6.版本3.6中的新功能。

--eval <javascript>¶

Evaluates a JavaScript expression that is specified as an argument. mongo does not load its own environment when evaluating code. As a result many options of the shell environment are not available.

--username <username>,-u <username>¶

Specifies a username with which to authenticate to a MongoDB database that uses authentication. Use in conjunction with the --password and --authenticationDatabase options.

If connecting to a MongoDB Atlas cluster using the MONGODB-AWS authentication mechanism, specify your AWS access key ID in this field, or in the connection string. Alternatively, this value may also be supplied as the environment variable AWS_ACCESS_KEY_ID. See Connect to a MongoDB Atlas Cluster using AWS IAM Credentials.

--password <password>,-p <password>¶

Specifies a password with which to authenticate to a MongoDB database that uses authentication. Use in conjunction with the --username and --authenticationDatabase options. To force mongo to prompt for a password, enter the --password option as the last option and leave out the argument.

If connecting to a MongoDB Atlas cluster using the MONGODB-AWS authentication mechanism, specify your AWS secret access key in this field, or in the connection string. Alternatively, this value may also be supplied as the environment variable AWS_SECRET_ACCESS_KEY. See Connect to a MongoDB Atlas Cluster using AWS IAM Credentials.

--awsIamSessionToken <aws session token>¶

If connecting to a MongoDB Atlas cluster using the MONGODB-AWS authentication mechanism and using session tokens in addition to your AWS access key ID and secret access key, specify your AWS session token in this field, or in the connection string. Alternatively, this value may also be supplied as the environment variable AWS_SESSION_TOKEN. See Connect to a MongoDB Atlas Cluster using AWS IAM Credentials.

Only valid when using the MONGODB-AWS authentication mechanism.

--help,-h¶

Returns information on the options and use of mongo.

--version¶

Returns the mongo release number.

--verbose¶

Increases the verbosity of the output of the shell during the connection process.

--networkMessageCompressors <string>¶

New in version 3.4.版本3.4中的新功能。

Enables network compression for communication between this mongo shell and:

• a mongod instance
• a mongos instance.

You can specify the following compressors:

• snappy
• zlib (Available starting in MongoDB 3.6)
• zstd (Available starting in MongoDB 4.2)

Important

Messages are compressed when both parties enable network compression. Otherwise, messages between the parties are uncompressed.

If you specify multiple compressors, then the order in which you list the compressors matter as well as the communication initiator. For example, if a mongo shell specifies the following network compressors zlib,snappy and the mongod specifies snappy,zlib, messages between mongo shell and mongod uses zlib.

If the parties do not share at least one common compressor, messages between the parties are uncompressed. For example, if a mongo shell specifies the network compressor zlib and mongod specifies snappy, messages between mongo shell and mongod are not compressed.

--ipv6¶

Enables IPv6 support. mongo disables IPv6 by default.

To connect to a MongoDB cluster via IPv6, you must specify both --ipv6 and --host <mongod/mongos IPv6 address> when starting the mongo shell.

mongod and mongos disable IPv6 support by default. Specifying --ipv6 when connecting to a mongod/mongos does not enable IPv6 support on the mongod/mongos. For documentation on enabling IPv6 support on the mongod/mongos, see net.ipv6.

<db name>¶

Specifies the name of the database to connect to. For example:例如：

mongo admin

The above command will connect the mongo shell to the admin database of the MongoDB deployment running on the local machine. You may specify a remote database instance, with the resolvable hostname or IP address. Separate the database name from the hostname using a / character. See the following examples:

mongo mongodb1.example.net/test
mongo mongodb1/admin
mongo 10.8.8.10/test

This syntax is the only way to connect to a specific database.

To specify alternate hosts and a database, you must use this syntax and cannot use --host or --port.

--enableJavaScriptJIT¶

New in version 4.0.版本4.0中的新功能。

Enable the JavaScript engine’s JIT compiler.

--disableJavaScriptJIT¶

Changed in version 4.0.在版本4.0中更改。The JavaScript engine’s JIT compiler is now disabled by default.

Disables the JavaScript engine’s JIT compiler.

--disableJavaScriptProtection¶

New in version 3.4.版本3.4中的新功能。

Allows fields of type javascript and javascriptWithScope (*Deprecated*) to be automatically marshalled to JavaScript functions in the mongo shell.

With the --disableJavaScriptProtection flag set, it is possible to immediately execute JavaScript functions contained in documents. The following example demonstrates this behavior within the shell:

> db.test.insert({ _id: 1, jsFunc: function(){ print("hello") } } )
WriteResult({ "nInserted" : 1 })
> var doc = db.test.findOne({ _id: 1 })
> doc
{ "_id" : 1, "jsFunc" : function (){ print ("hello") } }
> typeof doc.jsFunc
function
> doc.jsFunc()
hello

The default behavior (when mongo starts without the --disableJavaScriptProtection flag) is to convert embedded JavaScript functions to the non-executable MongoDB shell type Code. The following example demonstrates the default behavior within the shell:

> db.test.insert({ _id: 1, jsFunc: function(){ print("hello") } } )
WriteResult({ "nInserted" : 1 })
> var doc = db.test.findOne({ _id: 1 })
> doc
{ "_id" : 1, "jsFunc" : { "code" : "function (){print(\"hello\")}" } }
> typeof doc.func
object
> doc.func instanceof Code
true
> doc.jsFunc()
2016-11-09T12:30:36.808-08:00 E QUERY    [thread1] TypeError: doc.jsFunc is
not a function :
@(shell):1:1

<file.js>¶

Specifies a JavaScript file to run and then exit. Generally this should be the last option specified.

Optional

To specify a JavaScript file to execute and allow mongo to prompt you for a password using --password, pass the filename as the first parameter with --username and --password as the last options, as in the following:

mongo file.js --username username --password

Use the --shell option to return to a shell after the file finishes running.

Authentication Options¶

--authenticationDatabase <dbname>¶

Specifies the authentication database where the specified --username has been created. See Authentication Database.

If you do not specify a value for --authenticationDatabase, mongo uses the database specified in the connection string.

If using the GSSAPI (Kerberos), PLAIN (LDAP SASL), or MONGODB-AWS authentication mechanisms, you must set --authenticationDatabase to $external.

--authenticationMechanism <name>¶

Default: SCRAM-SHA-1

Specifies the authentication mechanism the mongo instance uses to authenticate to the mongod or mongos.

Changed in version 4.4:With MongoDB 4.4, the mongo shell adds support for the new MONGODB-AWS authentication mechanism when connecting to a MongoDB Atlas cluster.

Value	Description描述
SCRAM-SHA-1	RFC 5802 standard Salted Challenge Response Authentication Mechanism using the SHA-1 hash function.
SCRAM-SHA-256	RFC 7677 standard Salted Challenge Response Authentication Mechanism using the SHA-256 hash function. Requires featureCompatibilityVersion set to 4.0. New in version 4.0.版本4.0中的新功能。
MONGODB-X509	MongoDB TLS/SSL certificate authentication.
MONGODB-AWS	External authentication using AWS IAM credentials for use in connecting to a MongoDB Atlas cluster. See Connect to a MongoDB Atlas Cluster using AWS IAM Credentials. New in version 4.4.版本4.4中的新功能。
GSSAPI (Kerberos)	External authentication using Kerberos. This mechanism is available only in MongoDB Enterprise.
PLAIN (LDAP SASL)	External authentication using LDAP. You can also use PLAIN for authenticating in-database users. PLAIN transmits passwords in plain text. This mechanism is available only in MongoDB Enterprise.

--gssapiHostName¶

Specify the hostname of a service using GSSAPI/Kerberos. Only required if the hostname of a machine does not match the hostname resolved by DNS.

This option is available only in MongoDB Enterprise.

--gssapiServiceName¶

Specify the name of the service using GSSAPI/Kerberos. Only required if the service does not use the default name of mongodb.

This option is available only in MongoDB Enterprise.

TLS Options¶

--tls¶

New in version 4.2.版本4.2中的新功能。

Enables connection to a mongod or mongos that has TLS/SSL support enabled.

Starting in version 3.2.6, if --tlsCAFile or net.tls.CAFile (or their aliases --sslCAFile or ssl.CAFile) is not specified, the system-wide CA certificate store will be used when connecting to an TLS/SSL-enabled server. In previous versions of MongoDB, the mongo shell exited with an error that it could not validate the certificate.

To use x.509 authentication, --tlsCAFile or net.tls.CAFile must be specified unless using --tlsCertificateSelector or --net.tls.certificateSelector. Or if using the ssl aliases, --sslCAFile or net.ssl.CAFile must be specified unless using --sslCertificateSelector or net.ssl.certificateSelector.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsCertificateKeyFile <filename>¶

New in version 4.2.版本4.2中的新功能。

Specifies the .pem file that contains both the TLS/SSL certificate and key for the mongo shell. Specify the file name of the .pem file using relative or absolute paths.

This option is required when using the --tls option to connect to a mongod or mongos instance that requires client certificates. That is, the mongo shell present this certificate to the server.

Changed in version 4.4:mongod / mongos logs a warning on connection if the presented x.509 certificate expires within 30 days of the mongod/mongos host system time. See x.509 Certificates Nearing Expiry Trigger Warnings for more information.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsCertificateKeyFilePassword <value>¶

New in version 4.2.版本4.2中的新功能。

Specifies the password to de-crypt the certificate-key file (i.e. --tlsCertificateKeyFile).

Use the --tlsCertificateKeyFilePassword option only if the certificate-key file is encrypted. In all cases, the mongo will redact the password from all logging and reporting output.

If the private key in the PEM file is encrypted and you do not specify the --tlsCertificateKeyFilePassword option, the mongo will prompt for a passphrase. See TLS/SSL Certificate Passphrase.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsCAFile <filename>¶

New in version 4.2.版本4.2中的新功能。

Specifies the .pem file that contains the root certificate chain from the Certificate Authority. This file is used to validate the certificate presented by the mongod/mongos instance.

Specify the file name of the .pem file using relative or absolute paths.

Starting in version 3.2.6, if --tlsCAFile or net.tls.CAFile (or their aliases --sslCAFile or ssl.CAFile) is not specified, the system-wide CA certificate store will be used when connecting to an TLS/SSL-enabled server. In previous versions of MongoDB, the mongo shell exited with an error that it could not validate the certificate.

To use x.509 authentication, --tlsCAFile or net.tls.CAFile must be specified unless using --tlsCertificateSelector or --net.tls.certificateSelector. Or if using the ssl aliases, --sslCAFile or net.ssl.CAFile must be specified unless using --sslCertificateSelector or net.ssl.certificateSelector.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsCRLFile <filename>¶

New in version 4.2:In MongoDB 4.0 and earlier, see --sslCRLFile.

Specifies the .pem file that contains the Certificate Revocation List. Specify the file name of the .pem file using relative or absolute paths.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

Note

Starting in version 4.4, to check for certificate revocation, MongoDB enables the use of OCSP (Online Certificate Status Protocol) by default as an alternative to specifying a CRL file or using the system SSL certificate store.

--tlsAllowInvalidHostnames¶

New in version 4.2.版本4.2中的新功能。

Disables the validation of the hostnames in the certificate presented by the mongod/mongos instance. Allows mongo to connect to MongoDB instances even if the hostname in the server certificates do not match the server’s host.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsAllowInvalidCertificates¶

New in version 4.2.版本4.2中的新功能。

Bypasses the validation checks for the certificates presented by the mongod/mongos instance and allows connections to servers that present invalid certificates.

Note

Starting in MongoDB 4.0, if you specify --sslAllowInvalidCertificates or net.ssl.allowInvalidCertificates: true (or in MongoDB 4.2, the alias --tlsAllowInvalidateCertificates or net.tls.allowInvalidCertificates: true) when using x.509 authentication, an invalid certificate is only sufficient to establish a TLS/SSL connection but is insufficient for authentication.

Warning

Although available, avoid using the --sslAllowInvalidCertificates option if possible. If the use of --sslAllowInvalidCertificates is necessary, only use the option on systems where intrusion is not possible.

If the mongo shell (and other MongoDB Tools) runs with the --sslAllowInvalidCertificates option, the mongo shell (and other MongoDB Tools) will not attempt to validate the server certificates. This creates a vulnerability to expired mongod and mongos certificates as well as to foreign processes posing as valid mongod or mongos instances. If you only need to disable the validation of the hostname in the TLS/SSL certificates, see --sslAllowInvalidHostnames.

When using the allowInvalidCertificates setting, MongoDB logs as a warning the use of the invalid certificate.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--tlsFIPSMode¶

New in version 4.2.版本4.2中的新功能。

Directs the mongo to use the FIPS mode of the TLS/SSL library. Your system must have a FIPS compliant library to use the --tlsFIPSMode option.

Note

FIPS-compatible TLS/SSL is available only in MongoDB Enterprise. See Configure MongoDB for FIPS for more information.

--tlsCertificateSelector <parameter>=<value>¶

New in version 4.2:Available on Windows and macOS as an alternative to --tlsCertificateKeyFile.

The --tlsCertificateKeyFile and --tlsCertificateSelector options are mutually exclusive. You can only specify one.

Specifies a certificate property in order to select a matching certificate from the operating system’s certificate store.

--tlsCertificateSelector accepts an argument of the format <property>=<value> where the property can be one of the following:

Property	Value type	Description描述
subject	ASCII string	Subject name or common name on certificate
thumbprint	hex string	A sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest. The thumbprint is sometimes referred to as a fingerprint.

When using the system SSL certificate store, OCSP (Online Certificate Status Protocol) is used to validate the revocation status of certificates.

Changed in version 4.4:mongod / mongos logs a warning on connection if the presented x.509 certificate expires within 30 days of the mongod/mongos host system time. See x.509 Certificates Nearing Expiry Trigger Warnings for more information.

--tlsDisabledProtocols <string>¶

New in version 4.2.版本4.2中的新功能。

Disables the specified TLS protocols. The option recognizes the following protocols: TLS1_0, TLS1_1, TLS1_2, and starting in version 4.0.4 (and 3.6.9 and 3.4.24), TLS1_3.

• On macOS, you cannot disable TLS1_1 and leave both TLS1_0 and TLS1_2 enabled. You must also disable at least one of the other two; for example, TLS1_0,TLS1_1.
• To list multiple protocols, specify as a comma separated list of protocols. For example TLS1_0,TLS1_1.
• The specified disabled protocols overrides any default disabled protocols.

Starting in version 4.0, MongoDB disables the use of TLS 1.0 if TLS 1.1+ is available on the system. To enable the disabled TLS 1.0, specify none to --tlsDisabledProtocols. See Disable TLS 1.0.

SSL Options (Deprecated)¶

--ssl¶

Deprecated since version 4.2:Use --tls instead.

Enables connection to a mongod or mongos that has TLS/SSL support enabled.

Starting in version 3.2.6, if --tlsCAFile or net.tls.CAFile (or their aliases --sslCAFile or ssl.CAFile) is not specified, the system-wide CA certificate store will be used when connecting to an TLS/SSL-enabled server. In previous versions of MongoDB, the mongo shell exited with an error that it could not validate the certificate.

To use x.509 authentication, --tlsCAFile or net.tls.CAFile must be specified unless using --tlsCertificateSelector or --net.tls.certificateSelector. Or if using the ssl aliases, --sslCAFile or net.ssl.CAFile must be specified unless using --sslCertificateSelector or net.ssl.certificateSelector.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslPEMKeyFile <filename>¶

Deprecated since version 4.2:Use --tlsCertificateKeyFile instead.

Specifies the .pem file that contains both the TLS/SSL certificate and key. Specify the file name of the .pem file using relative or absolute paths.

This option is required when using the --ssl option to connect to a mongod or mongos that has CAFile enabled without allowConnectionsWithoutCertificates.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslPEMKeyPassword <value>¶

Deprecated since version 4.2:Use --tlsCertificateKeyFilePassword instead.

Specifies the password to de-crypt the certificate-key file (i.e. --sslPEMKeyFile). Use the --sslPEMKeyPassword option only if the certificate-key file is encrypted. In all cases, the mongo will redact the password from all logging and reporting output.

If the private key in the PEM file is encrypted and you do not specify the --sslPEMKeyPassword option, the mongo will prompt for a passphrase. See TLS/SSL Certificate Passphrase.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslCAFile <filename>¶

Deprecated since version 4.2:Use --tlsCAFile instead.

Specifies the .pem file that contains the root certificate chain from the Certificate Authority. Specify the file name of the .pem file using relative or absolute paths.

Starting in version 3.2.6, if --tlsCAFile or net.tls.CAFile (or their aliases --sslCAFile or ssl.CAFile) is not specified, the system-wide CA certificate store will be used when connecting to an TLS/SSL-enabled server. In previous versions of MongoDB, the mongo shell exited with an error that it could not validate the certificate.

To use x.509 authentication, --tlsCAFile or net.tls.CAFile must be specified unless using --tlsCertificateSelector or --net.tls.certificateSelector. Or if using the ssl aliases, --sslCAFile or net.ssl.CAFile must be specified unless using --sslCertificateSelector or net.ssl.certificateSelector.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslCertificateSelector <parameter>=<value>¶

Deprecated since version 4.2:Use --tlsCertificateSelector instead.

New in version 4.0:Available on Windows and macOS as an alternative to --tlsCertificateKeyFile.

--tlsCertificateKeyFile and --sslCertificateSelector options are mutually exclusive. You can only specify one.

Specifies a certificate property in order to select a matching certificate from the operating system’s certificate store.

--sslCertificateSelector accepts an argument of the format <property>=<value> where the property can be one of the following:

Property	Value type	Description描述
subject	ASCII string	Subject name or common name on certificate
thumbprint	hex string	A sequence of bytes, expressed as hexadecimal, used to identify a public key by its SHA-1 digest. The thumbprint is sometimes referred to as a fingerprint.

When using the system SSL certificate store, OCSP (Online Certificate Status Protocol) is used to validate the revocation status of certificates.

--sslCRLFile <filename>¶

Deprecated since version 4.2:Use --tlsCRLFile instead.

Specifies the .pem file that contains the Certificate Revocation List. Specify the file name of the .pem file using relative or absolute paths.

Note

Starting in version 4.4, to check for certificate revocation, MongoDB enables the use of OCSP (Online Certificate Status Protocol) by default as an alternative to specifying a CRL file or using the system SSL certificate store.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslFIPSMode¶

Deprecated since version 4.2:Use --tlsFIPSMode instead.

Directs the mongo to use the FIPS mode of the TLS/SSL library. Your system must have a FIPS compliant library to use the --sslFIPSMode option.

Note

FIPS-compatible TLS/SSL is available only in MongoDB Enterprise. See Configure MongoDB for FIPS for more information.

--sslAllowInvalidCertificates¶

Deprecated since version 4.2:Use --tlsAllowInvalidCertificates instead.

Bypasses the validation checks for server certificates and allows the use of invalid certificates to connect.

Note

Starting in MongoDB 4.0, if you specify --sslAllowInvalidCertificates or net.ssl.allowInvalidCertificates: true (or in MongoDB 4.2, the alias --tlsAllowInvalidateCertificates or net.tls.allowInvalidCertificates: true) when using x.509 authentication, an invalid certificate is only sufficient to establish a TLS/SSL connection but is insufficient for authentication.

Warning

Although available, avoid using the --sslAllowInvalidCertificates option if possible. If the use of --sslAllowInvalidCertificates is necessary, only use the option on systems where intrusion is not possible.

If the mongo shell (and other MongoDB Tools) runs with the --sslAllowInvalidCertificates option, the mongo shell (and other MongoDB Tools) will not attempt to validate the server certificates. This creates a vulnerability to expired mongod and mongos certificates as well as to foreign processes posing as valid mongod or mongos instances. If you only need to disable the validation of the hostname in the TLS/SSL certificates, see --sslAllowInvalidHostnames.

When using the allowInvalidCertificates setting, MongoDB logs as a warning the use of the invalid certificate.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslAllowInvalidHostnames¶

Deprecated since version 4.2:Use --tlsAllowInvalidHostnames instead.

Disables the validation of the hostnames in TLS/SSL certificates. Allows mongo to connect to MongoDB instances even if the hostname in their certificates do not match the specified hostname.

For more information about TLS/SSL and MongoDB, see Configure mongod and mongos for TLS/SSL and TLS/SSL Configuration for Clients .

--sslDisabledProtocols <string>¶

Deprecated since version 4.2:Use --tlsDisabledProtocols instead.

Disables the specified TLS protocols. The option recognizes the following protocols: TLS1_0, TLS1_1, TLS1_2, and starting in version 4.0.4 (and 3.6.9), TLS1_3.

• On macOS, you cannot disable TLS1_1 and leave both TLS1_0 and TLS1_2 enabled. You must also disable at least one of the other two; for example, TLS1_0,TLS1_1.
• To list multiple protocols, specify as a comma separated list of protocols. For example TLS1_0,TLS1_1.
• The specified disabled protocols overrides any default disabled protocols.

Starting in version 4.0, MongoDB disables the use of TLS 1.0 if TLS 1.1+ is available on the system. To enable the disabled TLS 1.0, specify none to --sslDisabledProtocols. See Disable TLS 1.0.

New in version 3.6.5.

Sessions¶

--retryWrites¶

New in version 3.6.版本3.6中的新功能。

Enables retryable writes as the default for sessions in the mongo shell.

For more information on sessions, see Client Sessions and Causal Consistency Guarantees.

Client-Side Field Level Encryption Options¶

--awsAccessKeyId <string>¶

An AWS Access Key associated to an IAM user with List and Read permissions for the AWS Key Management Service (KMS). The mongo shell uses the specified --awsAccessKeyId to access the KMS.

--awsAccessKeyId is required for enabling Client-Side Field Level Encryption for the mongo shell session. --awsAccessKeyId requires all of the following command line options:

• --awsSecretAccessKey
• --keyVaultNamespace

If --awsAccessKeyId is omitted, use the Mongo() constructor within the shell session to enable client-side field level encryption.

To mitigate the risk of leaking access keys into logs, consider specifying an environmental variable to --awsAccessKeyId.

--awsSecretAccessKey <string>¶

An AWS Secret Key associated to the specified --awsAccessKeyId.

--awsSecretAccessKey is required for enabling Client-Side Field Level Encryption for the mongo shell session. --awsSecretAccessKey requires all of the following command line options:

• --awsAccessKeyId
• --keyVaultNamespace

If --awsSecretAccessKey and its supporting options are omitted, use Mongo() within the shell session to enable client-side field level encryption.

To mitigate the risk of leaking access keys into logs, consider specifying an environmental variable to --awsSecretAccessKey.

--awsSessionToken <string>¶

An AWS Session Token associated to the specified --awsAccessKeyId.

--awsSessionToken is required for enabling Client-Side Field Level Encryption for the mongo shell session. --awsSessionToken requires all of the following command line options:

• --awsAccessKeyId
• --awsSecretAccessKey
• --keyVaultNamespace

If --awsSessionToken and its supporting options are omitted, use Mongo() within the shell session to enable client-side field level encryption.

To mitigate the risk of leaking access keys into logs, consider specifying an environmental variable to --awsSessionToken.

--keyVaultNamespace <string>¶

The full namespace (<database>.<collection>) of the collection used as a key vault for Client-Side Field Level Encryption. --keyVaultNamespace is required for enabling client-side field level encryption. for the mongo shell session. mongo creates the specified namespace if it does not exist.

--keyVaultNamespace requires all of the following command line options:

• --awsAccessKeyId
• --awsSecretAccessKey

If --keyVaultNamespace and its supporting options are omitted, use the Mongo() constructor within the shell session to enable client-side field level encryption.

Connect to a mongod Instance with Access Control¶

To connect to a database on a remote host using authentication and a non-standard port, use the following form:

mongo --username <user> --password --host <host> --port 28015

Alternatively, consider the following short form:

mongo -u <user> -p  --host <host> --port 28015

Replace <user> and <host> with the appropriate values for your situation and substitute or omit the --port as needed.

If you do not specify the password to the --password or -p command-line option, the mongo shell prompts for the password.

Connect to a Replica Set Using the DNS Seedlist Connection Format¶

To connect to a replica set described using the DNS Seed List Connection Format, use the --host option to specify the connection string to the mongo shell. In the following example, the DNS configuration resembles:

Record                            TTL   Class    Priority Weight Port  Target
_mongodb._tcp.server.example.com. 86400 IN SRV   0        5      27317 mongodb1.example.com.
_mongodb._tcp.server.example.com. 86400 IN SRV   0        5      27017 mongodb2.example.com.

The TXT record for the DNS entry includes the replicaSet and authSource options:

Record              TTL   Class    Text
server.example.com. 86400 IN TXT   "replicaSet=rs0&authSource=admin"

The following command then connects the mongo shell to the replica set:

mongo --host "mongodb+srv://server.example.com/?username=allison"

The mongo shell will automatically prompt you to provide the password for the user specified in the username option.

Connect to a MongoDB Atlas Cluster using AWS IAM Credentials¶

To connect to a MongoDB Atlas cluster which has been configured to support authentication via AWS IAM credentials, provide a connection string to the mongo shell similar to the following:

mongo 'mongodb+srv://<aws access key id>:<aws secret access key>@cluster0.example.com/testdb?authSource=$external&authMechanism=MONGODB-AWS'

Connecting to Atlas using AWS IAM credentials in this manner uses the MONGODB-AWS authentication mechanism and the $external authSource, as shown in this example.

If using an AWS session token as well, provide it with the AWS_SESSION_TOKEN authMechanismProperties value in your connection string, as follows:

mongo 'mongodb+srv://<aws access key id>:<aws secret access key>@cluster0.example.com/testdb?authSource=$external&authMechanism=MONGODB-AWS&authMechanismProperties=AWS_SESSION_TOKEN:<aws session token>'

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Alternatively, the AWS access key ID, and secret access key, and optionally session token can each be provided outside of the connection string using the --username, --password, and --awsIamSessionToken options instead, like so:

mongo 'mongodb+srv://cluster0.example.com/testdb?authSource=$external&authMechanism=MONGODB-AWS' --username <aws access key id> --password <aws secret access key> --awsIamSessionToken <aws session token>

When provided as command line parameters, these three options do not require percent encoding.

You may also set these credentials on your platform using standard AWS IAM environment variables. The mongo shell checks for the following environment variables when you use the MONGODB-AWS authentication mechanism:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• AWS_SESSION_TOKEN

If set, these credentials do not need to be specified in the connection string or via the explicit options to the mongo shell (i.e. --username and --password).

The following example sets these environment variables in the bash shell:

export AWS_ACCESS_KEY_ID='<aws access key id>'
export AWS_SECRET_ACCESS_KEY='<aws secret access key>'
export AWS_SESSION_TOKEN='<aws session token>'

Syntax for setting environment variables in other shells will be different. Consult the documentation for your platform for more information.

You can verify that these environment variables have been set with the following command:

env | grep AWS

Once set, the following example connects to a MongoDB Atlas cluster using these environment variables:

mongo 'mongodb+srv://cluster0.example.com/testdb?authSource=$external&authMechanism=MONGODB-AWS'

Execute JavaScript Against the mongo Shell¶

To execute a JavaScript file without evaluating the ~/.mongorc.js file before starting a shell session, use the following form:

mongo --shell --norc alternate-environment.js

To execute a JavaScript file with authentication, with password prompted rather than provided on the command-line, use the following form:

mongo script-file.js -u <user> -p

Use --eval to Execute JavaScript Code¶

You may use the --eval option to execute JavaScript directly from the command line.

For example, the following operation evaluates a JavaScript string which queries a collection and prints the results as JSON.

On Linux and macOS, you will need to use single quotes (e.g. ') to enclose the JavaScript, using the following form:

mongo --eval 'db.collection.find().forEach(printjson)'

On Windows, you will need to use double quotes (e.g. ") to enclose the JavaScript, using the following form:

mongo --eval "db.collection.find().forEach(printjson)"