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Have you prepared to attend the job interview? Are you confused in job research? Then no problem we have the right answer to you in in our site page. If you are aware with the Ubuntu then there are numerous leading companies that offer job roles DBA - Postgresql and Linux (Ubuntu), System Administrator - Linux/Ubuntu, Support Lead Ubuntu Linux and many other leading roles too. If you are preparing for Ubuntu Certified Professional interview and don’t know how to crack interview and what level or difficulty of questions to be asked in job interviews then go through Wisdomjobs Ubuntu Certified Professional interview questions and answers page to crack your job interview. Underneath are the commonly asked Ubuntu Certified Professional interview questions and answers and Ubuntu Certified Professional jobs role which can make you feel relaxed to face the interviews:
When you use command /usr/lib/nux/unity_support_test-p it will give detailed output about Unity’s requirements and if they are met, then your video card can run unity.
The command which enables root login is
#sudo sh-c ‘echo “greater-show-manual-login=true” >>/etc/lightdm/lightdm.conf’.
To enable startup sound in Ubuntu:
To reset the unity configuration the simplest way to do is to hit open a Terminal or hit Alt-F2 and run the command # unity –reset.
To access terminal , you have to go under Application Menu -> Accessories -> Terminal .
You can also open it with shortcut key Ctrl+Alt+T.
To create a folder in Ubuntu, you have to use command mkdir. It will be something like these : ~$ mkdir Ubuntu_rules.
To view the text file in Ubuntu, go to the specific folder where the text files are located by using the command cd and then type less filename.txt.
To enable curl on Ubuntu , first install libcurl, once done use following command sudo/etc/init .d /apache2 restart or sudo service apache2 restart.
To find a file in Ubuntu you have to use command,
To open Ubuntu terminal in a particular directory you can use custom keyboard short cut. To do that, in the command field of a new custom keyboard , type gnome – terminal – – working – directory = /path/to/dir.
Export is a command in Bash shell language, when you try to set a variable, it is visible or exported to any subprocess started from that instance of bash. The variable will not exist in the sub-process without the export command.
To uninstall the libraries in Ubuntu, you can use command sudo apt – get remove library_name
By using nohup. It will stop the process receiving the NOHUP signal and thus terminating it you log out of the program which was invoked with. & runs the process in the background.
You can open the background image in The Gimp (image editor) and then use the dropper tool to select the color on the specific point. It gives you the RGB value of the color at that point.
Libaio is Linux Kernel Asynchronous I/O (A/O). A/O allows even a single application thread to overlap I/O operations with other processing, by providing an interface for submitting one or more I/O requests in one system call without waiting for completion. And a separate interface to reap completed I/O operations associated with a given completion group.
To create launchers on desktop in Ubuntu you can use
ALT+F2 then type “ gnome-desktop-item-edit –create-new~/desktop “, it will launch the old GUI dialog and create a launcher on your desktop.
To color the Git console in Ubuntu you can use the command git config—global color.ui auto. In the command, the color.ui variable sets the default value for variable such as color.diff and color.grep.
To append one file to another in Ubuntu Linux you can use command cat file2 >> file 1. The operator >> appends the output of the named file or creates the file if it is not created. While another command cat file 1 file 2 > file 3 appends two or more files to one.
Through behaviours tab you can make many changes on the appearance of desktop
Auto hide the launcher : You can use this option to reveal the launcher when moving the pointer to the defined hot spot.
Enable workspaces: By checking this option you can enable workspace.
Add show desktop icon to the launcher: This option is used to display the desktop icon on the launcher.
To calculate the size of a folder use the command du –sh folder1.
There is no concept of Folder in Ubuntu. Everything including your hardware is a FILE.
Use the command
You can use the command:
Ubuntu till date has released three components, they are named as :
The first two components are targeted for the infrastructure layer of the computer stack. And UbuntuOne is meant for the software layer also known as Software as a service (SaaS).
The private cloud concept has a variety of usage scenarios. Some of them are :
Private cloud offers complete set of development tools and easy to configure panel where you can customize and deploy prototype applications.
The elements that are included in ubuntu cloud architecture are:
Cloud controller: it is the main controller that controls the communication between two nodes and allows the system to communicate with each other.
Walrus Storage controller: It controls the storage of the data and resource at one place for easy access.
Elastic block storage controller: it uses the elasticity concept and allow the resources to scale up as the demand rises. This block consists of dynamic resources.
Cluster controller: it controls the cloud clusters which are made up of mady nodes and contains the configuration of all the nodes from a single point.
Node controller: it consists of the hardware resources that is being provided to the web or to the user through cluster controller.
Walrus storage controller uses SOAP API that are compatible with its architecture.
Its main function is:
Node controller consists of the hardware settings and configuration for the image machines. It performs the tasks that are requested by cluster controller and reply to the queries.
It performs the following tasks:
1. Verify and authenticate the user request.
2. Allow user to download the image from the cache and use it.
3. Create a virtual network interface for easy communication between machines.
4. Start an instance of a virtual machine that can be accessed by the user.
The initial addition of Node Controller required a password to exchange the cryptographic keys from the lower controller to the upper one. After the password is exchanged, all operations rely on the trust provided by these keys in the communications between the controllers.
To prevent eavesdropping on network traffic from a machine run by one user to the machines run by other users, networking plays an important role in security.
Following networking modes are available at set-up time, depending on the level of security:
There are two types of actors that are required for authentication and authorization:
To authenticate and authorize the user there are two steps involved:
1. User should have access to the cloud controller account and access to its user interface.
2. Administrative rights to the user to create their own policies.
The registered users get a access key that gives the certificate and the query information to the user which can be used to authorize the user’s status.
The authentication will vary for each user to access the cloud and its service. To authenticate the user a password will be given to access the web console and retrieve their certificate and query key. Cloud controller verifies the authentication only at the first time but the authorization is verified at each level.
The three levels that are included in instance isolation:
Networking isolation: it keeps the overall security of the ubuntu cloud system and keeps the network isolated from the user sight so that there will be less security issues.
OS isolation: it keeps the user away from the operating system changes. It provides Mandatory Access control (MAC) system that includes default scripts to provide the isolation from the user to the Operating system.
Hypervisor based machine isolation: it doesn’t allow the user to know what kind of hypervisor is used to provide the services which users have asked for. It provides intrinsic properties to hide its existence from the users of the cloud.
Ubuntu enterprise cloud includes many features that are not being provided with the other cloud platforms:
Ethernet interfaces are the part of the networking and it is automatically identified by the system using different naming conventions. It is represented by ethX, where X= any numeric value. The default interface of the system is named as eth0 and it will go on after this.
To identify the Ethernet interface the command that is used:
ifconfig -a | grep eth
HWaddr 00:15:c5:4a:16:5aThe command will show all the interfaces that are associated with the system.
Cloud computing has a few disadvantages, some of them are:
Security and privacy: The data in ubuntu cloud have many instances with a third party which many users may not prefer. Cloud servers store sensitive information which must be protected at all costs. There is a vulnerability of unauthorized access.
Loss of control (dependency): In cloud computing the cloud service providers play a major role more maintenance and fixing of the cloud. Being a third party an organization has less control over it. And once a cloud is established migrating to another CSP is not an easy task.
Costs: Although in the long run cloud computing is cheap but being a new technology the improvements and research involved makes it quite expensive. To incorporate this technology many changes may be require including the development of software.
Integration and knowledge: As most of the functions are provided by a CSP getting to understand the system from an organizational point of view is tough. Also integration with existing systems is hard to achieve.
The IP addressing is an essential part of networking and to establish an ubuntu cloud it has to be configured correctly and the default gateway has to be mentioned for communication with other network or same network. To configure the IP addressing the command that can be used is ip, ifconfig and route. These are the commands that allow the configuration of the networking.
To set the configuration use the following command:
sudo ifconfig eth0 10.0.0.100 netmask 255.255.255.0
Through this IP address can be set and configured temporarily to save it permanently ifconfig file has to be modified.
Ubuntu Certified Professional Related Tutorials
|Networking Tutorial||Linux Tutorial|
|Linux Embedded systems Tutorial||Git (software) Tutorial|
|Puppet (software) Tutorial||Unix/Linux Tutorial|
Ubuntu Certified Professional Related Interview Questions
|Networking Interview Questions||Linux Interview Questions|
|Linux Embedded systems Interview Questions||UNIX/XENIX Interview Questions|
|DHCP Interview Questions||Git (software) Interview Questions|
|Amazon Web Services (AWS) Interview Questions||Puppet (software) Interview Questions|
|Nginx Interview Questions||Nagios Admin Interview Questions|
|Ansible (software) Interview Questions||Advanced Linux Interview Questions|
|Apache Tomcat Interview Questions||Unix/Linux Interview Questions|
|Red Hat Certified Engineer (RHCE) Interview Questions|
Broadband Networking Protocols Of Yesterday And Today
Tcp/ip In Embedded Systems
Linux Networking Interfaces And Device Drivers
The Linux Tcp/ip Stack
Socket Buffers And Linux Memory Allocation
Sending The Data From The Socket Through Udp And Tcp
The Network Layer, Ip
Receiving Data In The Transport Layer, Udp, And Tcp
Internet Protocol Version 6 (ipv6)
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