mongod

Mongod is a command line tool used in MongoDB, an open-source NoSQL database system. It is responsible for running the MongoDB server process. The 'mongod' command is used to start the MongoDB server and make it accessible for client applications. By default, mongod listens on port 27017 for client connections. It supports various configuration options that can be specified during the server startup. Some common options include specifying the database directory, port number, logging settings, authentication settings, and replication configurations. Mongod allows users to specify a custom configuration file using the '--config' option. It provides a way to start the server in different modes, such as standalone, replica set, or sharded cluster mode. Mongod also supports various command line options for server maintenance tasks, such as database repair, upgrading, and backup operations.