Category: Interview Questions

1. What Is The Use Of Virtual Environment In Virtuozzo?

Virtuozzo is an operating system that provides virtualization platform just like any other virtualization platform. It works well with the OpenVZ. It has it own containers that has the functionalities to provide the user with easiness and provide the environment in which management tools, recovery, etc can be incorporated. It provides the automation solution and built on top of OpenVZ.

2. What Are The Benefits Of Using Virtuozzo?

The benefits of using virtuozzo are as follows:

Higher container density:
It provides better performance of the containers used in the systems and increases the memory and file sharing rate between the shared systems.

Memory management:
It is easier to manage memory segments using this as it provides lots of easy to use tools for managing the memory module.

Management tools:
It allows user to monitor, troubleshoot and administer their own virtual machines to manage the memory and other resources.

Support and maintenance:
There are lots of tools and support provided for recovery and other back up tools.

3. How To Use And Maintain Virtuozzo?

Virtuozzo is a simple operating system to be used and managed. It allows the user to customize the platform using the built in management tools. It provides consistency between different platforms that are used. It maintains the tasks of different operating system together for easy maintenance and sharing. There are management tools that allow user to patch their product and if any difficulty can just upgrade the software version.

4. What Is The Use Of Physical To Virtual Tool For Linux In Virtuozzo?

Physical to virtual tool for Linux is used while deploying virtuozzo. It is used a migration tool between physical and virtual machines. This makes it easy for the operating system to deploy all the necessary services and applications that are required by the operating system. It allows the testing processes to be migrated to ensure the performance and efficiency levels.

5. What Is The Density Level Achieved By Virtuozzo?

The density range talks about the resources of the server, content of the server and the virtual environment in which all the things are taking place. The two most important resources that are required by any virtualization platforms are CPU and RAM. The more the processing power the fewer requirements will be for the offload processing. Virtuozzo achieves a high density for example of 100 virtual environments as it has minimal content and applications when used with Linux operating system but when used with windows more resources is being taken up by windows operating system.

6. What Is The Overhead That Comes While Using Virtuozzo?

Virtuozzo allows one server that is dedicated to be split into multiple virtual servers and called as virtual environments. It doesn’t add high amount of overhead but it keeps to minimal, as it adds only the native applications and operating system. It increases the performance by decreasing the overhead.

7. What Is The Difference Between Virtuozzo And Esx Server?

• Virtuozzo containers produce the virtualization at operating system level so they are called as type-2 Hypervisors, whereas ESX server produce the virtualization at hardware level and they are called as type-1 Hypervisors. 
• Virtuozzo provides low overhead compared to ESX server due to hardware level configurations.
• Virtuozzo provides high performance and high resources at lower cost compared to ESX server. 
• Virtuozzo’s containers provide the virtualization at the same level and there is no need for hardware virtualization, whereas ESX server has to be configured at the hardware level to produce the resources.

8. What Are The Disadvantages Of Using Virtuozzo?

The disadvantages of using virtuozzo are as follows:

Flexibility:
Flexibility decreases due to operating system virtualization as all the containers uses the same operating system.

• Virtuozzo containers can’t use different operating system and have different configurations. 
• It can’t virtualize the systems at high scale as it will require more resources.
• It can’t run high end operating system or else there is a degrade in the performance of the systems. 
• The connectivity of the system is such that it can communicate only in a small range and doesn’t have very high-end tool to manage the changes.

9. How To Manage Virtual Networks?

Virtual networks allow the creation and management of one or more virtual machines. It binds the container’s virtual network adapter with the physical adapter that is associated with the network. It allows user to create virtual network on hardware node, remove an existing virtual network, and list all the networks that are present with their properties and configurations.

10. How To Enable Nat For Virtuozzo Container?

• To enable the NAT services for virtuozzo container multiple servers has to be connected with the internet using the single IP address. The containers are running in host and bridged mode. NAT allows user to access the resources that are present on the internet. The command and properties combination that can be used to set the NAT for the container is vzctl set 101 –nat on –save
• This command will set the NAT for any container on the node. The 101 that is used is for a container that enables NAT for default virtual network adapter.

1. Explain Application / Server Architecture Being Used In Your Project?

We are using cluster of Web servers and Application servers. Load Balancer is used to manage the load between them. Down the layer we have middleware server and then DB server to access database.

2. What Are The Steps You Follow If You Receive An Application Outage Ticket?

• Inform the stake holders that the issue is being worked upon.
• Login to server to see if its responding. 
• Access Application and Web Server logs to see if the application is receiving requests.
• If not, Involve the appropriate Network Team. 
• Inform the stakeholders regarding the progress.
• Bounce the web / application server instance, if required.
• Close the ticket with the steps taken to resolve the problem.
• Complete the RCA (Root Cause Analysis) and submit the report to stake holders.

3. How Do You Monitor The Server Resources Of Inadvertently High Traffic Is Reported?

We use SAR command for that purpose. We also have GUI system monitoring tool to keep real time check of requests, load and memory usage.

4. How Do You Monitor Your Logs While Investigating A High Severity Problem?

We try to look for errors in the last n minutes when the issue occurred. If the issue is still occurring intermittently, we tail the logs for different application server instances to see the error snippets coming in the live logs.

5. Have You Done Any Sort Of Automation In Your System Monitoring Tasks?

Yes we have created System as well as Log monitoring scripts to keep track of exceptions. We are also using a tool that will inform the stake holders if an exceptional event occurs with the system.

6. What All Caching Has Been Used In Your Application?

We are using Akamai as web server cache.

7. Have You Ever Faced Any Problem Due To Caching?

Yes , sometime we receive issues related to outdated pages being rendered to the user. In those cases we clear the cache and then try to investigate the reason for that. Sometime the issue is due to comparatively high refresh interval. In those cases we reduce the cache refresh interval.

8. What If The Issue Is Related To Database Server?

We involve DBA and try to solve it through them. By the time they are solving it , we keep the stake holders informed regarding the progress.

9. Do You Use Command Aliases While Doing Your Work?

Yes, I have created many aliases and saved them within my .profile file so that the system loads them, the each time i logs onto the server.

10. What Are Your Responsibilities After The Ticket Has Been Closed?

We inform the stakeholders regarding the resolution and steps taken for it. We updated the ticket notes and link it with the master / related tickets. RCA is done for the high priority and critical issues and a report is submitted.