Install MongoDB etc for "MongoDB University M101J" course in Ubuntu 14.04

gistfile1.sh

beta@landlubber:~$ uname -a
Linux landlubber 3.13.0-46-generic #79-Ubuntu SMP Tue Mar 10 20:06:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
beta@landlubber:~$ java -version
java version "1.7.0_76"
Java(TM) SE Runtime Environment (build 1.7.0_76-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.76-b04, mixed mode)
beta@landlubber:~$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
[sudo] password for beta: 
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.OFXWl1OKUd --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/minecraft-installer-peeps-minecraft-installer.gpg --keyring /etc/apt/trusted.gpg.d/webupd8team-java.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)
beta@landlubber:~$ echo "deb http://repo.mongodb.org/apt/ubuntu "$(lsb_release -sc)"/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list
deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.0 multiverse
beta@landlubber:~$ sudo apt-get update
beta@landlubber:~$ sudo apt-get install -y mongodb-org
beta@landlubber:~$ echo "mongodb-org hold" | sudo dpkg --set-selections
beta@landlubber:~$ echo "mongodb-org-server hold" | sudo dpkg --set-selections
beta@landlubber:~$ echo "mongodb-org-shell hold" | sudo dpkg --set-selections
beta@landlubber:~$ echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
beta@landlubber:~$ echo "mongodb-org-tools hold" | sudo dpkg --set-selections
beta@landlubber:/$ sudo mkdir -p /data/db
beta@landlubber:~$ sudo chmod 777 /data
beta@landlubber:~$ sudo chmod 777 /data/db
beta@landlubber:~$ ls -ld /data/db
drwxrwxrwx 2 root root 4096 Mar 22 10:59 /data/db
beta@landlubber:~$ sudo gedit /etc/mongodb.conf # and change to this line: dbpath=/data/db
beta@landlubber:~$ whoami
beta
beta@landlubber:~$ which mongod
/usr/bin/mongod
beta@landlubber:~$ sudo service mongod restart # It should already been started, but I just want to make sure that that's the case.
mongod stop/waiting
mongod start/running, process 2755
beta@landlubber:~$ grep "waiting for connections on port" /var/log/mongodb/mongod.log # make sure that mongod is started successfully
2015-03-22T11:15:40.659+0800 I NETWORK  [initandlisten] waiting for connections on port 27017
beta@landlubber:~$ mongod # One of the differences is that mongod will automatically exit itself, rather than (as the Mac OS tutorial gives in lectures) that we need to manually exists it by Ctrl-C
...
2015-03-22T11:16:05.786+0800 I CONTROL  [initandlisten] MongoDB starting : pid=2774 port=27017 dbpath=/data/db 64-bit host=landlubber
...
2015-03-22T11:16:06.187+0800 I CONTROL  [initandlisten] dbexit:  rc: 48
beta@landlubber:~$ mongo # I tried to modify "/sys/kernel/mm/transparent_hugepage/enabled" etc, but it seems that files in "/sys/kernel" cannot be sodu modified??
MongoDB shell version: 3.0.1
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: 
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] 
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] 
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2015-03-22T11:15:40.630+0800 I CONTROL  [initandlisten] 
> db.names.insert({'name':'beta'})
WriteResult({ "nInserted" : 1 })
> db.names.find()
{ "_id" : ObjectId("550e355f4fdf3bab3972b951"), "name" : "beta" }
> quit()

remote-login.md

$ sudo gedit /etc/mongod.conf and comment out the line bind_ip = 127.0.0.1 and sudo service mongod restart.