Steps To Install MongoDb on Ubuntu 14.04

1.Import the public key used by the package management system. this is
to ensure package consistency and authenticity by requiring that distributors sign packages with GPG keys


ram@ram-pc:~$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10

[sudo] password for ram:
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.T0369j2BIX --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
gpg: requesting key 7F0CEB10 from hkp server keyserver.ubuntu.com
gpg: key 7F0CEB10: public key "Richard Kreuter <richard@10gen.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
ram@ram-pc:~$
 
2. Create a list file for MongoDB.

ram@ram-pc:~$ echo "deb http://repo.mongodb.org/apt/ubuntu "$(lsb_release -sc)"/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list
deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.0 multiverse


3. Reload local package database

ram@ram-pc:~$ sudo apt-get update

4. Install the MongoDB packages.


ram@ram-pc:~$ sudo apt-get install -y mongodb-org
Reading package lists... Done
Building dependency tree      
Reading state information... Done
The following extra packages will be installed:
  mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
The following NEW packages will be installed:
  mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell
  mongodb-org-tools
0 upgraded, 5 newly installed, 0 to remove and 290 not upgraded.
Need to get 50.7 MB of archives.
After this operation, 157 MB of additional disk space will be used.
Get:1 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org-shell amd64 3.0.4 [4,245 kB]
Get:2 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org-server amd64 3.0.4 [8,607 kB]
Get:3 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org-mongos amd64 3.0.4 [4,029 kB]
Get:4 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org-tools amd64 3.0.4 [33.8 MB]
Get:5 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org amd64 3.0.4 [3,616 B]
Fetched 50.7 MB in 37s (1,355 kB/s)                                           
Selecting previously unselected package mongodb-org-shell.
(Reading database ... 168992 files and directories currently installed.)
Preparing to unpack .../mongodb-org-shell_3.0.4_amd64.deb ...
Unpacking mongodb-org-shell (3.0.4) ...
Selecting previously unselected package mongodb-org-server.
Preparing to unpack .../mongodb-org-server_3.0.4_amd64.deb ...
Unpacking mongodb-org-server (3.0.4) ...
Selecting previously unselected package mongodb-org-mongos.
Preparing to unpack .../mongodb-org-mongos_3.0.4_amd64.deb ...
Unpacking mongodb-org-mongos (3.0.4) ...
Selecting previously unselected package mongodb-org-tools.
Preparing to unpack .../mongodb-org-tools_3.0.4_amd64.deb ...
Unpacking mongodb-org-tools (3.0.4) ...
Selecting previously unselected package mongodb-org.
Preparing to unpack .../mongodb-org_3.0.4_amd64.deb ...
Unpacking mongodb-org (3.0.4) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
Setting up mongodb-org-shell (3.0.4) ...
Setting up mongodb-org-server (3.0.4) ...
Adding system user `mongodb' (UID 117) ...
Adding new user `mongodb' (UID 117) with group `nogroup' ...
Not creating home directory `/home/mongodb'.
Adding group `mongodb' (GID 125) ...
Done.
Adding user `mongodb' to group `mongodb' ...
Adding user mongodb to group mongodb
Done.
mongod start/running, process 3003
Setting up mongodb-org-mongos (3.0.4) ...
Setting up mongodb-org-tools (3.0.4) ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up mongodb-org (3.0.4) ...
5. Install the latest stable version of MongoDB.
ram@ram-pc:~$ sudo apt-get install -y mongodb-org=3.0.4 mongodb-org-server=3.0.4 mongodb-org-shell=3.0.4 mongodb-org-mongos=3.0.4 mongodb-org-tools=3.0.4

Reading package lists... Done
Building dependency tree      
Reading state information... Done
mongodb-org is already the newest version.
mongodb-org-mongos is already the newest version.
mongodb-org-mongos set to manually installed.
mongodb-org-server is already the newest version.
mongodb-org-server set to manually installed.
mongodb-org-shell is already the newest version.
mongodb-org-shell set to manually installed.
mongodb-org-tools is already the newest version.
mongodb-org-tools set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 290 not upgraded.
6. Start mongodb service

ram@ram-pc:~$ sudo service mongod start
start: Job is already running: mongod

6. Connect mongo shell



ram@ram-pc:~$ mongo
MongoDB shell version: 3.0.4
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
    http://docs.mongodb.org/
Questions? Try the support group
    http://groups.google.com/group/mongodb-user
Server has startup warnings:
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten]
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten]
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2015-06-16T22:08:48.583+0530 I CONTROL  [initandlisten]
>

Source/Reference:
http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
http://docs.mongodb.org/getting-started/shell/client/