# ommongodb: MongoDB Output Module

Module Name: | ommongodb
Author: | Rainer Gerhards <rgerhards@adiscon.com>

## Purpose

This module provides native support for logging to MongoDB.

## Configuration Parameters

Note

Parameter names are case-insensitive.

### Action Parameters

#### UriStr

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | none | no | none

MongoDB connection string, as defined by the MongoDB String URI Format (See: https://docs.mongodb.com/manual/reference/connection-string/). If uristr is defined, following directives will be ignored: server, serverport, uid, pwd.

#### SSL_Cert

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | none | no | none

Absolute path to the X509 certificate you want to use for TLS client authentication. This is optional.

#### SSL_Ca

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | none | no | none

Absolute path to the trusted X509 CA certificate that signed the mongoDB server certificate. This is optional.

#### db

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | syslog | no | none

Database to use.

#### Collection

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | log | no | none

Collection to use.

#### Allowed_Error_Codes

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
array | no | no | none

The list of error codes returned by MongoDB you want ommongodb to ignore. Please use the following format: allowed_error_codes=[“11000”,”47”].

#### Template

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | OMSR_TPL_AS_MSG | no | none

Template to use when submitting messages.

Note rsyslog contains a canned default template to write to the MongoDB. It will be used automatically if no other template is specified to be used. This template is:

    template(name="BSON" type="string" string="\\"sys\\" : \\"%hostname%\\",
    \\"time\\" : \\"%timereported:::rfc3339%\\", \\"time\_rcvd\\" :
    \\"%timegenerated:::rfc3339%\\", \\"msg\\" : \\"%msg%\\",
    \\"syslog\_fac\\" : \\"%syslogfacility%\\", \\"syslog\_server\\" :
    \\"%syslogseverity%\\", \\"syslog\_tag\\" : \\"%syslogtag%\\",
    \\"procid\\" : \\"%programname%\\", \\"pid\\" : \\"%procid%\\",
    \\"level\\" : \\"%syslogpriority-text%\\"")

This creates the BSON document needed for MongoDB if no template is specified. The default schema is aligned to CEE and project lumberjack. As such, the field names are standard lumberjack field names, and not rsyslog property names. When specifying templates, be sure to use rsyslog property names as given in the table. If you would like to use lumberjack-based field names inside MongoDB (which probably is useful depending on the use case), you need to select fields names based on the lumberjack schema. If you just want to use a subset of the fields, but with lumberjack names, you can look up the mapping in the default template. For example, the lumberjack field “level” contains the rsyslog property “syslogpriority-text”.

## Examples

### Write to Database

The following sample writes all syslog messages to the database “syslog” and into the collection “log” on mongoserver.example.com. The server is being accessed under the account of “user” with password “pwd”. Please note that this syntax is deprecated by the “uristr” directive, as shown below.

    module(load="ommongodb")
    action(type="ommongodb"
           server="mongoserver.example.com" db="syslog" collection="log"
           uid="user" pwd="pwd")

### Write to mongoDB server with TLS and client authentication

Another sample that uses the new “uristr” directives to connect to a TLS mongoDB server with TLS and client authentication.

    module(load="ommongodb")
    action(type="ommongodb"
          uristr="mongodb://vulture:9091,vulture2:9091/?replicaset=Vulture&ssl=true"
          ssl_cert="/var/db/mongodb/mongod.pem"
          ssl_ca="/var/db/mongodb/ca.pem"
          db="logs" collection="syslog")

## Deprecated Parameters

Note

While these parameters are still accepted, they should no longer be used for newly created configurations.

### Action Parameters

#### Server

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | 127.0.0.1 | no | none

Name or address of the MongoDB server.

#### ServerPorted

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | 27017 | no | none

Permits to select a non-standard port for the MongoDB server. The default is 0, which means the system default port is used. There is no need to specify this parameter unless you know the server is running on a non-standard listen port.

#### UID

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | none | no | none

Logon userid used to connect to server. Must have proper permissions.

#### PWD

type | default | mandatory | `obsolete legacy` directive
--- | --- | --- | ---
word | none | no | none

The user’s password.

Support: rsyslog Assistant | GitHub Discussions | GitHub Issues: rsyslog source project

Contributing: Source & docs: rsyslog source project

© 2008–2025 Rainer Gerhards and others. Licensed under the Apache License 2.0.