# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /root/mongodata/log/mongod.log

# Where and how to store data.
storage:
  dbPath: /root/mongodata/db1 # also have db2 and so on for rest of the instances
  journal:
    enabled: true
#  engine:
#  mmapv1:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /rood/mongodata/db1/mongod.pid  # location of pidfile, different for 4 instances

# network interfaces
net:
  port: 30000 #port different for 4 different instances
  bindIp: 12.123.321.432(example ip, same for all 4 .conf files)

# security
security:
  KeyFile: /path to my keyfile location

#  authorization: enabled

#operationProfiling:

replication:
  replSetName: testReplica #have this same for all 4


#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

openssl rand -base64 756 > <path-to-keyfile>
chmod 400 <path-to-keyfile>

mongo --host 12.123.321.432 --port 30000

2016-12-22T20:55:38.396-0500 E QUERY    [thread1] Error: couldn't add user: not authorized on test to execute command { createUser: "root", pwd: "xxx", roles: [ { role: "root", db: "admin" } ], digestPassword: false, writeConcern: { w: "majority", wtimeout: 30000.0 } } :
_getErrorWithCode@src/mongo/shell/utils.js:23:13
DB.prototype.createUser@src/mongo/shell/db.js:1230:11
@(shell):1:1