Starting Database in Mongo

To start the mongo database server on the linux machine with specific parameters for the database to start with we can use a config file , generally named as mongod.conf

The file would contain the below entry, edit the required parameters as per requirement:

# mongod.conf

# where to write logging data.

systemLog:

  destination: file

  logAppend: true

  path: /u01/mongo/log/temp_mongod.log

# Where and how to store data.

storage:

  dbPath: /u01/mongo/tempData

  journal:

    enabled: true

#  engine:

#  mmapv1:

#  wiredTiger:

# how the process runs

processManagement:

  fork: true  # fork and run in background

  pidFilePath: /u01/mongo/tempData/mongod.pid  # location of pidfile

  #timeZoneInfo: /usr/share/zoneinfo

# network interfaces

net:

  port: 27017

  #bindIp: 127.0.0.1  # Listen to local interface only, comment to listen on all interfaces.

  bindIp: 172.30.5.71  # Listen to local interface only, comment to listen on all interfaces.

#security:

#operationProfiling:

replication:

replSetName: rs0

#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

This file can be used to start the mongo database deamon by using the below command:

mongod --config mongo.conf

 We can additionally use --fork to run the service in background

mongod --config mongo.conf --fork

The database files created when we execute the above command and start the mongo database are:

Journal – redo logs for crash recovery

Mongod.lock – to keep the database running

Pcat.ns – namespace file – system catalogue

Pcat.0,pcat.1 – data files , 2gb limit,automatically created and preallocated