20 August,2019 by Rambler
Question: How can I find and read the MongoDB system message log files? I'm troubleshooting some issues and need to gather some extra information
Answer: There's a few different options for identifying and reading the messaging log file . As a first step check the "mongod.conf" file , which has reference to the systemlog file
The default installation for the log file is /var/log/mongodb/mongodb.log but if you don't find it at this location , them check the mongod.conf file
You'll see something like :
# where to write logging data. systemLog: destination: file logAppend: true path: /var/log/mongodb/mongod.log
An alternative method to read 1024 mongod events which are logged is to use the getLog command. Just to clarify - the MongoDB command getLog reads only from RAM cache - the getLog doesn't read from the mongod Log. Note: The getLog requires administrative privileges otherwise you'll get an error message
"errmsg" : "not authorized on admin to execute command { getLog: \"*\", lsid: { id: UUID(\"xxxxxxxxxxxxxxxxxxxx\") }, $clusterTime: { clusterTime: Timestamp(1566284667, 1), signature: { hash: BinData(0, xxxxxxxxxxxxxxxxxxxxx), keyId: xxxxxxxxxxxxxx } }, $db: \"admin\" }", "code" : 13, "codeName" : "Unauthorized",
Read MongoDB cheatsheet for more MongoDB commands
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