How to adjust the memory usage of CentOS MongoDB

To configure the memory usage of MongoDB in CentOS system, you need to modify the MongoDB configuration file mongod.conf . The following steps will guide you through this:

1. Access configuration files: Use a text editor (such as nano ) to open a MongoDB configuration file, usually located in /etc/mongod.conf . Use the following command:

 sudo nano /etc/mongod.conf

2. Set memory limit: Find storage section in the mongod.conf file. This section contains options such as dbPath (database path) and journal (log file settings). In order to limit MongoDB memory usage, you need to modify the wiredTigerCacheSizeGB parameter in setParameter section. For example, limiting MongoDB memory to 2GB requires adding or modifying the following configuration:

 <code>setParameter: wiredTigerCacheSizeGB: 2</code>

Important: MongoDB 3.2 and above use the WiredTiger storage engine. If you are using an older version, you need to adjust cacheSize parameter instead of wiredTigerCacheSizeGB .

3. Save and close: Save the modifications to the mongod.conf file and close the text editor.

4. Restart MongoDB service: In order for the changes to take effect, restart MongoDB service:

 sudo systemctl restart mongod

MongoDB will now run according to the memory limits you specified in the configuration file.

Note: MongoDB will automatically adjust the cache size according to the available memory in the system. When setting memory limits, make sure to reserve enough memory resources for the operating system and other applications to avoid insufficient system resources.

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