Installing and setting up MongoDB on Linux

Use the following procedure to set up the MongoDB on a Linux server. This procedure applies to both stand-alone and high-availability setups.

Note

For high-availability, you must perform an additional step of configuring MongoDB for a replica set.

Deploying-MongoDB-as-a-replica-set

Switch to root access by running the following command:
sudo su
Download the Mongo database as follows:
curl -O https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.2.1.tgz
Extract the MongoDB archive by running the following command:
tar -zxvf mongodb-linux-x86_64-3.2.1.tgz
Copy MongoDB to the target directory by running the following commands:
mkdir -p /dbdata/mongodb
cp -R -n mongodb-linux-x86_64-3.2.1/ /dbdata/mongodb
Create the database data directory by running the following command:
mkdir -p /dbdata/mongodatawt
Create a key file that your deployment will use to authenticate servers to each other. Ensure that your key file meets the following requirements:
- Contains 6 to 1,024 characters and contains only characters in the base64 set
- Does not have group or world permissions on UNIX system
  To set read and write permissions for the file owner
  chmod 600 <KeyFile>
  - Setting the key file enables authentication, and specifies a key file for the replica set members to use when authenticating to each other
  - The key file content is arbitrary, but is the same on all members of the replica set instances that are connected to the set.
Use either of the following example Linux commands:
openssl rand -base64 741 > mongo.key
chmod 600 mongo.key
or
tr -cd '[:alnum:]' < /dev/urandom | fold -w50 | head -n1 > "mongo.key"
(Optional) Set the storage engine to wiredTiger for better performance and reduced storage size by running the following command:
/dbdata/mongodb/mongodb-linux-x86_64-3.0.6/bin/mongod --dbpath /dbdata/mongodatawt --port 27017 --storageEngine wiredTiger
Connect to the mongo shell, and create the administrator user and the social database administrator as follows:
use admin
db.createUser( {
user: "siteUserAdmin",
pwd: "<siteUserPassword>",
roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
});
db.createUser( {
user: "siteRootAdmin",
pwd: "<siteRootAdminPassword>",
roles: [ { role: "root", db: "admin" } ]
});
use social
db.createUser( {
user: "social_admin",
pwd: "<social_adminPassword>",
roles:
[ { role: "dbOwner", db: "social" } ]
});
Stop the Mongo process.
Add MongoDB as a service with the key file parameter.
On the Red Hat Enterprise Linux (including CENT OS), create the /etc/mongod.conf file and add the following settings:
dbpath = /dbdata/mongodatawt
port = 27017
logpath = /dbdata/mongodb/mongo_social.log
logappend = true
quiet = true
journal = true
replSet = myitsocial
fork = true
keyFile = /dbdata/mongodb/mongo.key
nohttpinterface = true
storageEngine = wiredTiger
Important considerations
In the mongo.cfg file, comment out the following parameters:

For MongoDB version earlier than 2.6.x:
#setParameter = textSearchEnabled=true

For MongoDB version earlier than 3.0.x:
#storageEngine = wiredTiger

For a standalone setup:
#replSet=
#keyFile=
Create the /etc/init.d/mongorepl file with the appropriate permissions and the following content:
#!/bin/sh
#
# /etc/init.d/mongorepl
# Subsystem file for "MyIT-MongoRepl" server
#
# chkconfig: 2345 95 05 (1)
# description: MyIT-MongoRepl server daemon
#MONGOBIN -> point to mongod binary.

MONGOBIN="/dbdata/mongodb/mongodb-linux-x86_64-3.2.1/bin/mongod"

do_start()
{
  echo "starting!";
  eval "$MONGOBIN -f /etc/mongod.conf";
}

do_stop()
{
  echo "stopping!"
  eval "$MONGOBIN -f /etc/mongod.conf --shutdown";
}

case "$1" in
   start)
      do_start
      ;;
   stop)
      do_stop
      ;;
esac

exit 0
Use the Redhat chkconfig Utility to start the service automatically:
- To add mongorepl to chkconfig, and enable in runlevel, run:
  chkconfig --add mongorepl
  chkconfig mongorepl on
- To start or stop the mongorepl service:
  service mongorepl start
  service mongorepl stop
(For highavailability) After installing and setting up MongoDB on Linux, go to Configuring-MongoDB-for-replica-set.

Installing and setting up MongoDB on Linux

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