Ubuntu is a Linux-based operating system. It is designed for computers, smartphones, and network servers. The system is developed by a UK based company called Canonical Ltd. All the principles used to develop the Ubuntu software are based on the principles of Open Source software development.
Following are some of the significant features of Ubuntu −
The desktop version of Ubuntu supports all the normal software on Windows such as Firefox, Chrome, VLC, etc.
It supports the office suite called LibreOffice.
Ubuntu has an in-built email software called Thunderbird, which gives the user access to email such as Exchange, Gmail, Hotmail, etc.
There are a host of free applications for users to view and edit photos.
There are also applications to manage videos and it also allows the users to share videos.
It is easy to find content on Ubuntu with the smart searching facility.
The best feature is, it is a free operating system and is backed by a huge open source community.
Every year there are 2 releases of Ubuntu, one in April and one in October, from Canonical. The version number normally denotes the year in which the software was released. For example, version 14.04 specifies that it was released in the year 2014 and in the month of April. Similarly, the version 16.04 specifies that it was released in the year 2016 and in the month of April. The April build every year is the more stable build, while the October build does a lot of experimentation on new features.
The official site for Ubuntu is https://www.ubuntu.com/
The site has all information and documentation about the Ubuntu Software. It also has the download links for both the server and desktop versions of Ubuntu.
Ubuntu comes in a variety of flavors. In this chapter, we will discuss briefly about some of the popular flavors of Ubuntu.
This is the operating system which can be used by regular users. This comes pre-built with software that help the users perform usual basic activities. Operations such as browsing, email and multimedia are also available in this edition. The latest version as of September 2016 is 16.04.01.
The server version is used for hosting applications such as web servers and databases. Each server version is supported by Ubuntu for 5 years. These operating systems have support for cloud platforms such as AWS and Azure. The latest version as of September 2016 is 16.04.1.
The normal Ubuntu interface is based on a software called Unity. However, Kubuntu is based on a software called KDE Plasma desktop. This gives a different look and feel to the Ubuntu software. Kubuntu has the same features and software availability as Ubuntu. The official site for Kubuntu is https://www.kubuntu.org/
This is also based of the Ubuntu operating system. It comes pre-built with a lot of applications for the modern user in the space of photos and multimedia. This operating system is completely based on the open source community.
The official site for Linux Mint is https://www.linuxmint.com/
We need to ensure we have the right hardware specifications in order to have Ubuntu installed.
Ensure the following system requirements are met before proceeding with the installation.
|Memory||2GB RAM (recommended)|
|Disk Space||25GB of free hard disk space|
|Processor||2 GHz dual core processor or better|
|Other requirements||An optional DVD drive or USB drive with the Installer media. An internet connection to download the optional updates.|
Step 1 − To download Ubuntu, go to the following url − https://www.ubuntu.com/download/desktop
Step 2 − On this page, there is an option to download the older versions of Ubuntu if required. Click the Alternative downloads and torrents link.
Step 3 − Go to Past releases link. It then presents a page with all the past releases of the Ubuntu software.
Now let’s learn about installing the desktop version of Ubuntu. For the purpose of this tutorial, we will go with the latest version which is 16.04. The installer is a ISO image which can be mounted on a DVD drive or USB stick. Once the image is booted on the machine, following are the steps for installation.
Step 1 − The first screen allows us to either install or try out Ubuntu. The try out option allows us to see the features of Ubuntu without actually installing it. However, we want to use Ubuntu, so let’s choose the Install Ubuntu option.
Step 2 − The next screen gives you 2 options. One is to download updates in the background while installing and the other is to install 3rd party software. Check the option to install 3rd party software. Then click the Continue button.
Step 3 − In the next screen, the following options are presented −
The disk is erased and the installation is carried out. If there was another operating system already on the disk, then Ubuntu would detect it and give the user the option to install the operating system side by side.
There is an option to encrypt the installation. This is so that if anybody else were to steal the data, they would not be able to decrypt the data.
Finally, Linux offers a facility called LVM, which can be used for taking snapshots of the disk.
For the moment, to make the installation simple, let’s keep the options unchecked and proceed with the installation by clicking the Install Now button.
Step 4 − In the following screen, we will be prompted if we want to erase the disk. Click the Continue button to proceed.
Step 5 − In this screen, we will be asked to confirm our location. Click the Continue button to proceed.
Step 6 − Now, we will be asked to confirm the language and the keyboard settings. Let us select English (UK) as the preferred settings.
Step 7 − In the following screen, we will need to enter the user name, computer name and password which will be used to log into the system. Fill the necessary details as shown in the following screenshot. Then, click the continue button to proceed.
The system will now proceed with the installation and we will see the progress of the installation as shown in the following screenshot.
At the end of the installation, the system will prompt for a restart.
Step 8 − Click the Restart Now to proceed.
Once the restart is complete, log in with the username and password.
Once logged in, the desktop is presented as shown in the following screenshot.
We now have a fully functional version of Ubuntu. In the subsequent chapters, we will look at the various features available.
Let us take a quick look at the Ubuntu environment before we proceed ahead with the remaining chapters.
The Control Panel on the left-hand side of the screen presents shortcuts for all of the most used applications. Using these options, we can launch the LibreOffice component, the Firefox browser, the Software Center and many other applications.
When we launch any application, we will get the associated menu bar at the top of the application, which will have the different menu options for that application. We can choose to close the entire window or resize the window, if required.
On the right-hand side of the screen is the task bar. The taskbar allows us to choose the change in volume settings, view the status of your internet connect, change your language and other settings, and view the battery status while working on a laptop.
By default, Ubuntu comes with pre-built required drivers for the mouse, keyboard, audio and video drivers. Long gone are the days where device drivers used to be a nightmare for Linux-based operating systems.
To view the options for devices, go to the settings options on the left-hand side control panel.
In the hardware section, you will see the various options for the hardware devices such as the display monitor, keyboard, mouse, etc.
For example, using the Display section, we can change the resolution of the screen along with other display settings as shown in the following screenshot.
To install any additional drivers, we need to go to the respective driver website and download the necessary distribution for the particular device driver. Then, use the Software Center to install the required device driver.
Ubuntu has a Software Center using which you can install a host of applications. The Software Center is designed to search the Internet for available software which can be downloaded and installed.
Step 1 − In the control panel, the Software Center appears on the left-hand side of the screen. In the following screenshot, it is encircled in a red box. Double-click to open it.
Once open, it shows the following options −
Step 2 − We can also browse through various software categories. For example, let’s click the Audio category. We can see a list of available software for installation. As seen in the following screenshot, the application ‘Rhythmbox’ has already been installed.
Step 3 − Now let us choose an application, say the Music application and see how it installs.
Step 4 − Once we click the Music application, the following screenshot pops up. Click the Install button to begin the installation.
We will then see the Installing progress bar to show that the Music application is being installed.
Step 5 − Once the installation is complete, click the Launch button to launch the software.
To see the list of already installed software on the machine, go to the Installed section of the Software Center application. This presents an option to remove the unwanted software if required, as shown in the following screenshot.
To remove any unwanted software, click the Remove button associated with the required software.
In the updates section, we can install critical updates available for the Ubuntu operating system. This section also shows the updates available for the software already installed on the system.
Click the Install button next to the desired update that needs to be installed.
The default browser for Ubuntu is Firefox and the latest version of Ubuntu always comes with the latest version of Firefox. On the desktop, you will see Firefox as the third component on the lefthand side. Double-click the icon to get started.
We can type the address of the site we wish to visit in the address bar and hit enter to get the site loaded. We will get the same user-like experience as in Windows.
Step 1 − Additional add-ons can be installed by going to the options and choosing the Add-ons option.
Using this option, we can view the add-ons installed and install new ones.
We can search for an add-on and then click the Install button to install an add-on.
Step 2 − For example, let us install the “Download flash and Video” add-on as shown in the above screenshot. Click the Install button at its side.
Step 3 − Once done, the browser will prompt for restart. After restarting the browser, go to the Installed Add-ons section. It will show the “Flash and Video Download” add-on installed as seen in the following screenshot.
Here, we can see how the browser will adapt to various screen sizes.
Step 1 − Click Options → Developer.
Step 2 − Click Responsive Design View.
Now, we can view the site in different browser sizes to see if they would respond as they should if they are viewed on different devices.
The default application for Chrome usage on Ubuntu is called Chromium. Following are the steps to install Chromium −
Step 1 − Go to the application manager for Ubuntu and go to the Internet section.
Step 2 − In the following screen, click the Chromium web browser option.
Step 3 − Next, click the Install button to install Chromium.
Step 4 − Once the browser is installed, the chromium browser option will appear on the left-hand panel. Use it to launch Chromium.
The default email client in Ubuntu is Thunderbird. The following steps show how to start using Thunderbird as the email client software.
We can quickly search for any application using the Search facility in Ubuntu.
Step 1 − Double-click on the search facility, enter the keyword of email and the search result of Thunderbird email will appear.
Step 2 − Double-click the search result to launch the Thunderbird mail client. Once the email client is launched, there will be a request to link an email account to the mail client.
Step 3 − Click “Skip this and use my existing email” button, so that we can use the current email credentials.
Step 4 − Enter the required credentials and click the Continue button to proceed. Once configured, the email client will then provide the common features for any email client. Now, we will be able to view the Inbox as well as all the messages in the Inbox.
Step 5 − Click any message to get more information on the received email as shown in the following screenshot.
Step 1 − In the Menu option, click the Write option to create a message which needs to be sent.
Step 2 − Enter the message details. Once complete, click the Send Button. Note, there is also an option to spell check and add attachments.
The sent messages will be displayed in the Sent messages section as shown in the following screenshot.
On the right-hand side of the screen, there are shortcuts available to view mail, compose a new message, and view contacts as seen in the following screenshot.
The default messaging software used on desktops today is the Skype software. This software is distributed by Microsoft. Skype by default does not come with Ubuntu installation. It will not be present in the Software Center. We have to download and install it from the official Skype site. Following are the steps to get this in place.
Step 1 − Go to the official download site for Skype − https://www.skype.com/en/downloadskype/skype-for-computer/
Step 2 − The site will automatically understand that we are working from a Linux distribution and provide options for downloading the Linux version of Skype. We will choose the Ubuntu 12.04 version, as this will work on the later distribution.
Step 3 − Once the package is downloaded, it will open in the Software Center. Choose the Install option to install the package.
Step 4 − Once Skype is installed, we can search for it and launch it accordingly.
Step 5 − Click the ‘I Agree’ button in the following screenshot.
Skype will now launch.
Step 6 − Enter the required credentials to start using Skype.
Ubuntu provides some options when it comes to Media Players.
By default, it contains a music player called Rhythmbox.
We can search for it, and launch it as shown in the following screenshot.
The general user interface of Rhythmbox is as shown in the following screenshot. It can be used to play music from the computer or even download and listen to songs from the Internet.
To add music, click the File menu option and choose the Add Music option.
To listen to radio stations, click on the Radio option on the left hand side of the screen, click the desired radio station, and click the play button.
Shotwell is the default application for managing photos. This application does a good job in offering the users all the possible options required for managing photos and photo albums.
We can search for the application and launch it as shown in the following screenshot.
The general user interface of the application is as shown in the following screenshot.
To import the existing folders, choose the menu option of File → Import from folder.
Then choose the location to which the photos are to be imported and click the OK button.
It now gives an option to either copy the photos from the place or to Import in place. Let’s choose the option to copy the photos.
Once done, the photos will then be visible in the source location.
Enhancement tools can be used to enhance the picture. To do so, just click the picture and choose the Enhance option from the left-hand context menu.
We can then enlarge the picture, auto correct it, remove red-eye along with many other adjustment features.
VLC is the most widely used video player and this is also available in Ubuntu.
To get VLC installed, following are the steps.
Step 1 − Go to the Software Center and choose the Video option.
Step 2 − Choose the option of VLC media player as shown in the following screenshot.
Step 3 − Click the Install button in the following screen to begin the installation of VLC media player.
Step 4 − Once complete, click the Launch button.
VLC media player will now launch. The media player can be normally used as on a Windows machine.
Ubuntu provides the facility to create new users who can be authorized to log on to the system. Let’s look at the different functions that can be performed with the help of user management.
The following steps need to be performed for the creation of users.
Step 1 − Launch the user management console from the search menu. In the search menu, enter the keyword of users. The User Accounts icon will then appear. Double-click on the User Accounts icon.
Step 2 − The user management screen will then pop up as shown in the following screenshot. To perform any sort of user management, we first need to press the Unlock button and enter our administrator credentials.
Step 3 − Enter the administrator credentials in the pop-up box which comes up and click the Authenticate button.
Once we click Authenticate, all the user management functions on the screen will become enabled.
Step 4 − Click the plus button to create a user.
Step 5 − Enter the user details. We can only create Standard and Administrator account types.
Step 6 − Click the Add button to complete the operation of adding the user.
When the user is created, the user account is disabled. This is because a password has not been associated with the account.
Following are the steps to enable the user account.
Step 1 − Click the Account disabled option. This will prompt for the password dialog box.
We have the option to either set a password, log in without a password, or enable the account. A good practice is to always set a password for an account.
Step 2 − To set the password and click the Change button.
Step 3 − The account will now be enabled. Log in using the newly created account.
To manage user permissions and groups, an additional package needs to be installed. Following are the steps to manage user permissions and groups.
Step 1 − Go to the search option and type the command keyword.
Step 2 − The search result of Terminal appears. Click it to open the command prompt.
Step 3 − Next, issue the following command.
sudo apt-get install gnome-system-tools
The apt-get command line is used to install additional packages from the Internet for the Ubuntu system. Here, we are telling Ubuntu that we want to install additional system tools so that we can manage user permissions and groups.
Step 4 − We will then be prompted for the password of the current logged in account and to also confirm to download the necessary packages for the installation. Enter the ‘Y’ option to proceed.
Step 5 − Once the installation is complete, when we search for users in the search option in Ubuntu, we can see an additional option of Users and Groups.
Step 6 − Click the Users and Groups option. Now, there will be an additional option of user and groups.
Step 7 − Click the Advanced settings button. We will be prompted to enter the password of the current logged on user to authenticate. Enter the password and click the Authenticate button.
Step 8 − In the next dialog box which appears, we will then be able to assign the required user privileges to the user.
Step 9 − Now, if we click on the Groups option, we will see that it has the option to create and delete groups.
Step 10 − Click on the Add button to add a group.
Step 11 − In the next dialog box, we can provide a group name and assign members to that group.
Step 12 − Finally, click the OK button to create the group.
To open the file like explorer in Ubuntu, click the Files option in the software launcher. In the following screenshot the Files icon is encircled in red.
On clicking the icon, the following screen which is the File like explorer in Ubuntu opens up.
Step 1 − To create a folder, choose a location where the folder needs to be created.
Step 2 − Then right-click and choose the option of New Folder.
Step 3 − Provide a name for the folder accordingly.
Step 1 − To rename a folder, right-click the folder which needs to be renamed.
Step 2 − Right-click and choose the rename option from the context menu.
Step 3 − Provide the new name of the folder accordingly.
Note − There are other options such as move or copy the folder or move the folder to trash.
To see the properties of a file, right-click the file and choose the Properties option from the context menu.
Using the option, we can view the properties of the file and modify the permissions of the file accordingly as shown in the following screenshot.
The Word Writer comes in-built in Ubuntu and is available in the Software launcher.
The icon is encircled in red in the above screenshot. Once we click on the icon, the writer will launch.
We can start typing in the Writer as we normally would do in Microsoft Word.
To save a document, just click on the save menu option as shown in the following screenshot.
Specify the location, the name of the file and then click the Save button.
To create a new document, choose the new menu option as shown in the following screenshot. It shows an option to create various types of documents.
To open an existing document, choose the option of opening an existing document from the file menu options as shown in the following screenshot. The option icon is encircled in red.
Once the open menu option is clicked, it presents a dialog box with an option to choose the file which needs to be opened. Click on the desired file and then click Open.
Tables can be inserted using the Insert table option as shown in the following screenshot.
Once the table has been added, we can then work on the table as we would on Microsoft Word.
To add additional rows and columns work to the table, right-click on the table and choose the various table options available.
You can also work with the format of the text using the various font options in the toolbar of Word Writer.
The default application for spreadsheets in Ubuntu is called Calc. This is also available in the software launcher.
Once we click on the icon, the spreadsheet application will launch.
We can edit the cells as we would normally do in a Microsoft Excel application.
Formulas can be added in the same manner as in Microsoft Excel. The following example shows an excel sheet which has 3 columns. The 3rd column is the multiplication of the Units and Unit price column.
The columns can be dragged to ensure the same formula is repeated for each row.
To save a sheet, go to the Save As menu option as shown in the following screenshot.
Provide the name, location of the spreadsheet and click the Save button to save the sheet.
There are various other formatting options available in the toolbar in the Calc application as shown in the following screenshot.
On the right-hand side of the Calc application, there are various other options. One of them is to insert a chart in the spreadsheet.
Once we click the Chart option, it will prompt for the type of Chart to be inserted. Choose a chart type and click the Finish button.
Now, we can see the Chart in the spreadsheet.
LibreOffice is a suite of office products available in Ubuntu. It is similar to the Microsoft suite of products although there are some features of Microsoft Office that does not work with LibreOffice and vice versa.
LibreOffice was first introduced in the year 1985 by a company called StarOffice. In the year 2002, the suite was taken by OpenOffice.org with Sun Microsystems being a major contributor to the product. From the year 2010 onwards, a separate branch of the source code of the product was taken which is now known as LibreOffice.
We will look at the LibreOffice writer and Calc in subsequent chapters. In this chapter, we will look at LibreOffice Impress which is the PowerPoint version of Microsoft.
The LibreOffice suite comes in-built in Ubuntu and is available in the Software launcher.
The icon of LibreOffice is encircled in red in the above screenshot. Once we click on the icon, the Impress Software will launch and the following screen will pop up.
The interface looks quite similar to Microsoft PowerPoint. We can then modify the content on the slides as required.
Adding slides to Impress is pretty similar to Microsoft PowerPoint. There are multiple ways of adding slides. One way is to use the Duplicate Slide option.
We can decide on the slide layout of the new slide by choosing the layout from the layout panel that appears on the right-hand side of the screen.
To save the presentation, choose the ‘Save As’ menu option.
Provide the name and location of the slide and click the Save button.
To open an existing presentation, click the Open menu option.
Choose the location and name of the file. Click the Open button to open the presentation.
Ubuntu is a Linux based operating system and most Linux users are more familiar with the command line interface. In this chapter, we will go through some of the popular command line’s used in Ubuntu.
To invoke the command line, go to the search option and enter the command keyword in the search box.
The search result will give the Terminal option. Double-lick to get the command line as shown in the following screenshot.
The easiest command to start with, is the directory listing command which is used to list the directory contents.
ls –option directoryname
Option − These are the options to be specified with the ls command.
Directoryname − This is the optional directory name that can be specified along with the ls command.
The output will be the listing of the directory contents.
In the following example, we just issue the ls command to list the directory contents.
The directory listing of the current directory will be shown as the output.
Another variant of the ls command is to list the directory, but with more details on each line item. This is shown in the following screenshot with the ls –l command.
To clear the screen, we can use the clear command.
The command line screen will be cleared.
To get more information on a command, we can use the ‘man’ command.
Commandname − This is the name of the command for which more information is required.
The information on the command will be displayed.
Following is an example of the ‘man’ command. If we issue the ‘man ls’ command, we will get the following output. The output will contain information on the ls command.
We can use the find command to find for files.
Filepattern − This is the pattern used to find for files.
The files based on the file pattern will be displayed.
In this example, we will issue the following command.
This command will list all the files which start with the word ‘Sample’.
This command is used to display who is the current logged on user.
The name of the current logged on user will be displayed.
In this example, we will issue the following command.
This command will display the current working directory.
The current working directory will be displayed.
In this example, we will issue the following command.
Since we have the ability to work with the command line which we covered in the previous chapter, it is common to create scripts which can perform simple jobs. Scripting is normally used to automate administrative tasks. Let’s create a simple script using the following steps. The script will be used to display the IP address assigned to the machine.
Step 1 − Open the editor. Just like notepad in Windows, Ubuntu has a text editor. In the search dialog box, enter the keyword of editor. Then double-click on the Text Editor option.
The following editor screen pops up.
Step 2 − Enter the following text in the editor.
originalAddress=@(ifconfig | grep “inet addr” | head –n 1 | cut –d “:” –f 2 | cut –d “ “ –f 1) echo $originalAddress
Step 3 − Save the file as write-ip.sh.
Now once you have saved the file, we need to assign the file some execute rights. Otherwise, we will not be able to execute the file.
Step 4 − Go to the command prompt, navigate to the Desktop location and issue the following command.
chmod a+x write-ip.sh
The above command will provide execute permissions to the file.
Step 5 − Now, we can execute the file by issuing the following command.
The output will be the IP address assigned to the machine as shown in the following screenshot.
Ubuntu provides the options to view the network details of the workstation. Following are the steps to view the network details of the machine.
Step 1 − In the search dialog box, type the keyword ‘network’.
Step 2 − Double-click the Network icon. We can see the hostname assigned to the machine.
Step 3 − Click the Network folder option and we can see the IP address assigned to the machine.
Step 4 − Click the Options button and we can modify the details of the network connection.
Ubuntu also comes in a server version. This version is used for hosting applications such as webbased applications. The server version can be downloaded from the Ubuntu site in the same way as the desktop version of Ubuntu.
For the purpose of this tutorial, let’s look at the installation of the server version 14.04, which is one of the most popular versions of Ubuntu. Following are the steps for installation.
Step 1 − Download for the server version from the link − http://releases.ubuntu.com/14.04/
Step 2 − Once the download of the server version is complete, put it on a USB device or bootable DVD. Boot the hardware from the bootable device.
Step 3 − The system prompts to select a language for the Installation. Select English and press the Enter button.
Step 4 − In the next step, choose the option to install Ubuntu server and press the Enter button.
Step 5 − The system again prompts to select a language for the installation. Choose the English language and press the Enter button.
Step 6 − In the next screen, select the desired region and then press the Enter button.
Step 7 − The next step includes the detection of the Keyboard layout. Choose the ‘No’ option and press the Enter button.
Step 8 − In the next screen, click the English(US) as the keyboard layout and press the Enter button.
Step 9 − After performing a set of initial configuration steps, we will be prompted to enter a name for the system. Enter Ubuntuserver and press the Enter key.
Step 10 − You will then be prompted to enter a real name and the username for an account to be created. Enter the name ‘demo’ and press Enter on both screens.
Step 11 − Now we need to enter a password for the new account. Enter a password and press the Enter button. The system will ask to verify the password.
Step 12 − The system then asks if we want to encrypt the home directory. For the moment, let us say ‘No’ and press Enter to proceed. The encryption is such that if anyone does hack into the system, they will not be able steal the data as it is encrypted.
Once we are an advanced user of Ubuntu server, we can choose ‘Yes’ as the option. But for now let’s leave this as unencrypted.
Step 13 − The Ubuntu server installation will then set the time settings. Choose ‘Yes’ and press the Enter button to proceed.
Step 14 − Next the disk setup will take place. Choose the option ‘Guided – use entire disk and set up LVM’ and press the Enter button to proceed.
Step 15 − The installation will erase all the data on the disk. Since this is a fresh installation, this is not an issue. Click the Enter button to proceed.
Step 16 − We will be asked to confirm all the changes to the disk. Choose the ‘Yes’ option and Press the Enter button to proceed.
Step 17 − The installation will detect the size of the hard disk. Hit the Enter button to proceed.
Step 18 − The system then asks to finalize the changes to the disk. Choose the ‘Yes’ option and press the ‘Enter’ button to proceed.
The system will then start performing a series of steps for the installation.
Step 19 − It will then ask to configure the Proxy setting. We can leave this setting as is and press the Enter button.
The installation will then start configuring the apt package manager.
The installation of the necessary software will then start.
Step 20 − The system then asks if we want to configure automatic updates. For now, select ‘No automatic updates’ and press the Enter button.
Step 21 − The next step is to install any additional software. Select ‘OpenSSH’ server which allows one to remotely connect to the server. Press the Enter button to proceed.
The system will start installing the remaining software on the system.
Step 22 − The system now requests to install the GRUB boot loader. Choose the ‘Yes’ option and press the Enter button to proceed.
Step 23 − Once the installation is complete, press the Continue option to proceed.
The system will then reboot after the installation.
Step 24 − We will then be requested to log into the system. Enter the credentials which were entered at the time of installation.
We will finally be logged into the system.
We have successfully installed the server version of Ubuntu.
The Secure Shell (SSH) in Linux is used to log into the machine in an encrypted and safe manner. This helps in providing a secure channel to streamline all requests to the Ubuntu server. SSH uses cryptographic keys to log into the server.
On Windows, the most common tool to perform a secure shell to a Linux server is putty. In this chapter, we will learn how to use putty to Secure Shell into a server.
Step 1 − Download putty from the http://www.putty.org/ site.
Step 2 − Before connecting to use putty, we need to know the IP address of our Ubuntu box. To do this, type ifconfig in the command shell of the Ubuntu server.
From the above screenshot, we know that the IP address of the server is 192.168.0.20
Step 3 − Next step is installing SSH on the server. In order to SSH to a server, you need to make sure it is installed. Run the following command in the Ubuntu server command prompt session.
sudo apt-get install openssh-server
Step 4 − Launch PuTTY. Enter the IP address of the Ubuntu server and click the Open button.
Step 5 − The next screen requests to accept the encrypted key sent from the server.
Step 6 − Finally, enter the username and password to log into the server. We have successfully established a secure shell to the server.
The Ubuntu desktop edition can be used to develop web applications. One of the most famous software which can be used for development on Ubuntu is Aptana. Let’s see the steps on how to get Aptana and get a simple web project up and running.
Step 1 − On Ubuntu desktop, open Firefox and go to the url − http://www.aptana.com/products/studio3/download
Step 2 − Click the Download Aptana Studio 3 button.
Step 3 − Once downloaded, extract the zip file to a suitable location. Once extracted, click the AptanaStudio3 link.
The following interface pops up. We can then choose to create a new web project, if required.
The required development can be carried out on the web project.
Nginx is a much lighter web server than Apache. This web server has become quite popular in the recent years. The Apache web server can be quite complex to configure and use. However, Nginx is much simpler. This chapter will focus on how to install this light web server.
To install Nginx, following are the steps −
Step 1 − Open the command terminal on Ubuntu desktop and run the following command.
sudo apt-get update
This first ensures that all packages on the operating system are up to date.
Step 2 − Next enter the following command to install the nginx server.
sudo apt-get install nginx
Step 3 − Once done, if we run ps –ef | grep nginx, we can see the process for the web server in a running state.
We now have nginx run as a web server on Ubuntu.
Ubuntu can also be installed as virtual machines. Some of the software which support virtual machines are −
Let’s use Oracle VirtualBox to create our Ubuntu virtual machine. Oracle VirtualBox is a free tool from Oracle. Following are the steps to have the virtual machine in place.
Step 1 − Download Oracle VirtualBox from the oracle site − https://www.virtualbox.org/
Step 2 − Go to the downloads section and download the Windows version.
Step 3 − Once download is complete, install VirtualBox. Launch the installer. Click the Run button on the following screen.
Step 4 − Click the Next button on the subsequent screen.
Step 5 − Choose the appropriate folder location and click the Next button.
Step 6 − Click Next on the subsequent screen.
Step 7 − Click the ‘Yes’ button on the next screen to proceed ahead with the installation.
Step 8 − Click Install on the next screen.
Step 9 − After the installation is complete, launch Oracle VirtualBox. On the Launch screen, click the ‘New’ menu option.
Step 10 − Give a name for the virtual machine and give the type as Ubuntu and then click the Next button.
Step 11 − In the next screen, keep the recommended RAM as it is and click the Next button.
Step 12 − Accept the default setting for the virtual hard disk and click the Create button.
Step 13 − Accept the hard disk type and click the Next button.
Step 14 − Accept the default type of physical hard disk allocation and click the Next button.
Step 15 − Accept the default file location and click the Create button.
Step 16 − Now that the Virtual Machine has been created, click the Settings Menu option.
Step 17 − Go to the Storage option, click the Empty disk icon and browse for the Ubuntu iso image. Then click the OK button.
Finally click the Start button. The system prompts to install Ubuntu. Follow the steps in the Installation chapter and we will have a Virtual Machine hosting Ubuntu.
MySQL and Python are famous database and development software respectively. These are normally installed on Linux-based systems. Let’s see how we can get them installed on Ubuntu server environments.
The first thing to do is to find out what is the version of Python installed on the system. We can find this issuing the following command.
Where the –v option specifies to show what is the version of Python installed. The following screenshot shows a sample of the output of the above command.
From the above output, we can see that the version of Python installed is version 2.7.
There is another way to see if Python is installed via the following commands.
The later command is used to see the version 3 of Python installed.
If we want to have the latest version of Python installed, then we need to issue the following statement.
sudo apt-get install python3
The above command will download the necessary packages for Python and have it installed.
To install MySQL, the following steps need to be followed.
Step 1 − Issue the apt-get command to ensure all operating system packages are up to date.
sudo apt-get update
Step 2 − Once all the packages have been updated, it is time to get the packages for MySQL.
sudo apt-get install mysql-server
The above command will start the download of all the relevant packages for MySQL.
Once the download completes and the installation starts, the installer will first ask to configure a root password.
Step 3 − Enter the required password and click the OK button. It will also prompt to re-enter the password.
Step 4 − To see the MySQL process running, run the following command.
ps –ef | grep mysql
The following screenshot shows mysqld which is the daemon process for mysql running in the background.
Step 5 − To configure mysql, run the following command.
It prompts to enter the root password which was entered during the installation process.
Step 6 − Enter the password and hit Enter.
Now, it prompts on whether we want to change the root password.
Step 7 − Enter ‘N’ for No and proceed.
Again, it prompts on whether we want to remove the Anonymous access.
Step 8 − When connecting from other machines on this database, it is advised to keep the default options as ‘N’ for both anonymous users and disallow root login remotely.
Step 9 − It is advised to provide the option as No for the options of Remove test database as well. We can enter ‘Y’ to reload the privileges table.
Finally, the configuration of MySQL will be complete.
Following are the steps to get Node.js installed.
Step 1 − Run the following command.
sudo apt-get install nodejs
This will install all the necessary packages for Node.js
Next, we need to install the Node package manager which is required for Node.js applications.
Step 2 − Run the following command.
sudo apt-get install npm
All the necessary packages for the node package manager will be installed.
Step 3 − Next, create a symbolic link to the Node.js folder. Then, run the Node –v command and npm –v to see the Node and npm version installed.
Docker is a container service which allows one to run applications or even operating systems on a host operating system as containers. Containers are a new and exciting technology that has evolved over the last couple of years and being adopted by a lot of key organizations.
Docker is a company that develops these special containers for applications. The official website for Docker is https://www.docker.com/
As an exercise, let’s install a CentOS container on an Ubuntu system. CentOS is a Linux-based operating system from Red Hat. Thus, we will be running the CentOS system on top of Ubuntu. Following are the steps to have this in place.
Step 1 − The first step is to install the Docker application on Ubuntu server. Thus on the Ubuntu test server, run the following command to ensure that OS updates are in place.
sudo apt-get update
Step 2 − Once all updates have been processed, issue the following command to get Docker installed.
sudo apt-get install -y docker.io
Step 3 − Once the Docker packages are installed, we should receive an output message stating that the Docker process has started and is running. The Docker process is known as the Docker engine or Docker daemon.
Step 4 − To view the version of Docker running, issue the Docker info command.
Step 5 − The next step is to install our CentOS image on Ubuntu.
Docker has a special site called the Docker hub, which is used to store pre-built images for Docker. The link to the site is https://hub.docker.com/
Step 6 − Do a quick and simple sign-in process to be able to log into the site and see all the available Docker images.
Step 7 − Once logged in, click the Explore button to see all the available Docker images.
The two important points to note are −
The Docker pull command. This is the command to install the Docker image on Linux box.
The Docker details for the various versions of CentOS.
Step 8 − On Ubuntu box, run the command.
sudo docker pull centos:latest
The download of the Docker component starts and the CentOS Docker is downloaded. The name of the Docker image is centos:latest, which means that we have the latest Docker image for CentOS.
Step 9 − To see all the Docker images installed, issue the command
sudo docker images
In the following screenshot, we can see that the Docker image is just 196.8 MB in size, and this is the subset of the CentOS which now runs on Ubuntu system.
Step 10 − To start CentOS, we need to issue a command to the OS to get a thread started. We can do this by running the following command.
sudo docker run -it centos /bin/bash
The above command does the following things −
Runs the CentOS Docker image.
Runs the image in interactive mode by using the -it option.
Runs the /bin/bash command as the initial process.
We can also install Ubuntu on various cloud environments such as Google Cloud, Amazon web services, and Azure web services. In this chapter, we will see how to get Ubuntu up and running on Amazon web services. Following are the steps to get this in place.
Step 1 − One can get a free account with Amazon web services. All we need to do is register with AWS on the following url − https://aws.amazon.com/
Step 2 − Click the Sign in to the Console and it presents the following dialog box.
Step 3 − Click the option ‘I am a new user’ and enter the required email id of an existing Gmail account. Then click the ‘Sign in using our secure server’ button. We will then need to give some information in the subsequent screen to create an account.
Step 4 − Once an account has been created, we can log into the console. Once logged in, click the EC2 option. This option is used for creating virtual machines on the cloud.
Step 5 − In the following screenshot, click the Launch Instance button.
Step 6 − The next screen prompts to select an appropriate AMI. An AMI is a pre-built image for an operating system in Amazon. Scroll down until to the Ubuntu option and click the Select button.
Step 7 − In the next screen, choose the configuration of the machine. Choose the General purpose – t2.micro option and then click the ‘Next: Configure Instance Details’ button.
Step 8 − In the next screen, enter the following details as shown in the screenshot.
The number of instances to launch – Keep 1 as the default.
VPC – If there is no existing VPC, choose the option to create a new one.
Now, if we choose the option to create a new subnet, we need to perform the following sub steps.
Click the Create VPC button. (Note: The VPC is known as a virtual private network which is used to store all AWS objects in an isolated environment.)
In the Create VPC dialog box, enter the following details and click the ‘Yes Create’ button.
Click the Next: Add Storage button.
Step 9 − In the next screen, keep the default storage as is and click the Review and Launch button.
Step 10 − The review screen will pop up. Click the Launch button.
Step 11 − The next screen prompts to create a new key pair. This is required to log into the instance when it is created. Enter a key name and click the download Key pair button.
Step 12 − Once download is complete, click the Launch Instances button.
Step 13 − Click the ‘View Instances’ button.
Step 14 − Once the state of the instance is running, click the Connect button.
The next dialog box presents the steps to log into the Ubuntu server machine.
Step 15 − Perform the steps as we would normally do, using a SSH client to log into the machine.