MongoDB Logs
MongoDB logs contain critical log related information that can be used to obtain essential insights by splitting them into associated fields such as date & time, log level, component, context, and message. OpManager Nexus AppLogs is a log management product that facilitates simple log management by pooling all your logs in one single interface. OpManager Nexus AppLogs natively supports MongoDB along with other critical applications. Learn more about log management with OpManager Nexus.
Getting started
- Log in to your OpManager Nexus account.
- Download and install the OpManager Nexus Server Monitoring agent (Windows | Linux).
- Go to Admin > AppLogs > Log Profile and Add Log Profile.
Logs file path
Each application writes logs in different folders and files. By default, MongoDB logs are sourced from the below-mentioned folder path for the respective Operating System. If you have logs in a different folder, you can mention it under the File Path to source them from that particular folder while creating a log profile.
Starting with MongoDB 4.4, all log output is in JSON format, consisting of key-value pairs. In earlier versions, the log output was in plain text. Please find the supported log patterns for both cases below.
For MongoDB version 4.4 or above
Log pattern
This is the default pattern defined by OpManager Nexus for parsing MongoDB logs for version starting 4.4.
json $t.ESC($)date as Datetime:date:yyyy-MM-dd'T'HH:mm:ss.SSSX$ $s as Severity$ $c as Component$ $id$ $ctx as Context$ $msg as Message$ $attr as Attributes:json-object$
Sample log
{"t":{"$date":"2020-05-01T15:16:17.180+00:00"},"s":"I", "c":"NETWORK", "id":12345, "ctx":"listener", "msg":"Listening on","attr":{"address":"127.0.0.1"}}
This log is separated into fields, each of which will take its respective value, and is then uploaded to OpManager Nexus.
For MongoDB version below 4.4
Log pattern
This is the default pattern defined by OpManager Nexus for parsing MongoDB logs for versions below 4.4.
$DateTime:date:yyyy-MM-dd'T'HH:mm:ss.SSSX$ $Severity$ $Component$ [$Context$] $Message
Sample log
2017-06-07T12:22:33.456-700 I NETWORK [initandlisten] waiting
This log is separated into fields, each of which will take its respective value, and is then uploaded to OpManager Nexus.
| Field name | Field value |
| DateTime | 2017-06-07T12:22:33.456-700 |
| Severity | I |
| Component | NETWORK |
| Context | initandlisten |
| Message | waiting |