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logRotate

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  • Definition
  • Compatibility
  • Syntax
  • Command Fields
  • Limitations
  • Behavior
  • Examples
logRotate

The logRotate command is an administrative command that allows you to rotate the MongoDB server log and/or audit log to prevent a single logfile from consuming too much disk space.

You must issue the logRotate command against the admin database.

This command is available in deployments hosted in the following environments:

  • MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

Note

This command has limited support in M0, M2, M5, and M10 clusters. For more information, see Unsupported Commands.

The command has the following syntax:

db.adminCommand(
{
logRotate: <integer or string>,
comment: <string>
}
)

The command takes the following fields:

Field
Type
Description
logRotate
integer or string

The log or logs to rotate, according to the following:

  • 1 -- Rotates both the server and audit logs

  • "server" -- Rotates only the server log

  • "audit" -- Rotates only the audit log

comment
string
Optional. A message logged by the server to the log file and audit file at time of log rotation.

You may also rotate the logs by sending a SIGUSR1 signal to the mongod process.

For example, if a running mongod instance has a process ID (PID) of 2200, the following command rotates the log file for that instance on Linux:

kill -SIGUSR1 2200

The systemLog.logRotate setting or --logRotate option specify logRotate's behavior.

When systemLog.logRotate or --logRotate are set to rename, logRotate renames the existing log file by appending the current timestamp to the filename. The appended timestamp has the following form:

<YYYY>-<mm>-<DD>T<HH>-<MM>-<SS>

Then logRotate creates a new log file with the same name as originally specified by the systemLog.path setting to mongod or mongos.

When systemLog.logRotate or --logRotate are set to reopen, logRotate follows the typical Linux/Unix behavior, and simply closes the log file then reopens a log file with the same name. With reopen, mongod expects that another process renames the file prior to the rotation, and that the reopen results in the creation of a new file.

The following example rotates both the server log and the audit log:

db.adminCommand( { logRotate: 1 } )

The following example rotates only the audit log, and provides a custom message to the log file at time of rotation:

db.adminCommand( { logRotate: "audit", comment: "Rotating audit log" } )

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