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Server - Interview Questions and Answers for 'Production support' - 27 question(s) found - Order By Newest

 Q1. What are the reasons to choose between reserved and on demand instances ?Server
Ans. In terms of compute options and configurations, Reserved Instances and On Demand instances are the same. The only difference between the two is that a Reserved Instance is one you rent (reserved) for a fixed duration, and in return you receive a discount on the base price of an On Demand instance.

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   Like         Discuss         Correct / Improve     aws  aws ec2  aws computing  amazon cloud computing  amazon ec2  production support  Google Cloud Platform (GCP)


 Q2. There is a server which is 90% full, I need to increase the space. How can I do it ?Server
Ans. Firstly ,we have removed old backup data from server after that we are checking which user consume high memory through df command.

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 Q3. What are LDAP servers used for ?Java EE
Ans. LDAP servers are typically used in J2EE applications to authenticate and authorise users. LDAP servers are hierarchical and are optimized for read access, so likely to be faster than database in providing read access.

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   Like         Discuss         Correct / Improve     java   j2ee   ldap   servers   authentication   authorization   architecture   technical lead   technical architect  production support     Asked in 1 Companies


 Q4. What is Nagios ?
Ans. Nagios is open source system , network and infrastructure monitoring software application. It alerts the user if anything goes wrong. Nagios is widely used as monitoring tool for enterprise applications.

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   Like         Discuss         Correct / Improve     production support   application support   nagios   system monitoring


  Q5. Explain Application / Server architecture being used in your project ?

or

Explain your project architecture ?
Ans. 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.

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   Like         Discuss         Correct / Improve     architecture   production support   java   servers   application support     Asked in 7 Companies        frequent


 Q6. How do you monitor the server resources if inadvertently high traffic is reported ?
Ans. 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.

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   Like         Discuss         Correct / Improve     server monitoring   production support   servers   website traffic   system monitoring   sar   application support


 Q7. Have you ever faced any problem due to caching?
Ans. 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.

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   Like         Discuss         Correct / Improve     caching   cache   java   web applications   production support   application support


 Q8. What is Hot Deployment ?Server
Ans. It is the ability to deploy changes on the fly without need to first build , deploy and then restart. All these functions happens on the fly as soon as the changes are made to the code.

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 Q9. Difference between Hot and Cold Deployment ?Server
Ans. Cold Deployment is a conventional deployment mechanism that follows the multi step process to deploy code changes to the running app i.e Build -> Deploy - Restart.

whereas

Hot Deployment is deployment changes on the fly without need to first build , deploy and then restart. All these functions happens on the fly as soon as the changes are made to the code.

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 Q10. What are the steps you follow if you receive an application outage ticket ?Support
Ans. a. Inform the stake holders that the issue is being worked upon.
b. Login to server to see if its responding.
c. Access Application and Web Server logs to see if the application is receiving requests.
d. If not, Involve the appropriate Network Team.
e. Inform the stakeholders regarding the progress.
f. Bounce the web / application server instance , if required.
g. Close the ticket with the steps taken to resolve the problem.
h. Complete the RCA ( Root Cause Analysis ) and submit the report to stake holders.

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 Q11. How do you monitor the server resources if inadvertently high traffic is reported ?Support
Ans. 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.

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   Like         Discuss         Correct / Improve     production support  unix  SAR


 Q12. How do you monitor your logs while investigating a high severity problem ?Support
Ans. 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.

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 Q13. Have you done any sort of automation in your system monitoring tasks ?Support
Ans. 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.

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 Q14. What all caching has been used in your application?Support
Ans. We are using Akamai as web server cache.

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 Q15. Have you ever faced any problem due to caching?Support
Ans. 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.

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   Like         Discuss         Correct / Improve     production support  caching


 Q16. What actions you take if there is an issue related to Database server ?Support
Ans. 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.

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 Q17. What are your responsibilities after the problem ticket has been closed ?Support
Ans. 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.

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 Q18. Difference between Load Balancing and Failover Clustering ?Server
Ans. Load Balancing is a provision to improve performance by reducing load on a single machine / server. Traffic or load is distributed among different machines and hence resulting in better performance / response time by leveraging more resources.

Failover is a provision to achieve better availability by switching to a backup server in case of failure.

Load Balancing aims as improving performance whereas failover aims at improving availability.

We can achieve both together by using a Load Balancing system which will isolate an instance in case of it's failure.

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   Like         Discuss         Correct / Improve     load balancing  failover  load balancing vs failover  production support


 Q19. What do you understand by "Scaling Trigger" ?Server
Ans. It's a configuration for auto scaling environment that specify the attributes / conditions for scaling instances up and down. For example - We may like environment to scale up when the number of requests / sec increases a particular threshold and scale down when it decreases below a threshold.

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   Like         Discuss         Correct / Improve     AWS  Amazon AWS  Amazon EC2  Elastic Beanstalk  Auto Scaling  Scaling Trigger  production support


 Q20. What is the difference between "Manual Scaling" and "Auto Scaling" ? Server
Ans. Manual scaling is the process of scaling instances up and down in a an enviornment manually by observing the scaling trigger whereas Auto scaling is the process wherein a Trigger condition specified as a scaling trigger will trigger scaling up and down of instances.

for example - If an organization has a policy of scaling up if requests / sec / instance exceeds 10000, Operations team will have to manually monitor the metric and they can request scaling up and down as the need arise. Manual scaling offers flexibility as team can scale on the basis of combination of factors and can take decision on flyby requires continuous monitoring.

The same trigger can be fed as triggering policy to the environment and can be taken care by the system. This requires availability of such triggering policy within the environment configuration but as it's automatically handled, requires no supervision.

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   Like         Discuss         Correct / Improve     Scaling  manual scaling   auto scaling   manual vs auto scaling  production support


 Q21. What are the benefits of cloud computing ?Server
Ans. Primary benefits of cloud computing include –

Data backup and storage
Reduced costs of managing and maintaining IT systems
Powerful server capability and scalability
Better productivity and collaboration efficiency
Access to automatic updates

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 Q22. How cloud computing is different than virtualization ?Server
Ans. A Virtualization is software that virtualizes your hardware into multiple machines while Cloud computing is the combination of multiple hardware devices. In Virtualization, a user gets dedicated hardware while in Cloud computing multiple hardware devices provide one login environment for the user.

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 Q23. What is Web Server and explain its types?Server
Ans. A program that uses HTTP for serving files that create web pages for users in response to their requests that are sent by the HTTP clients of their computer is called as a web server.

Web - Server Types

Apache HTTP Server by the Apache Software Foundation
Internet Information Service from Microsoft
Sun Java System Web Server
Jigsaw Server.

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 Q24. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?Server
Ans. We can provision more instances for that particular time slot.

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 Q25. Difference between Containerization and Serverless ? Infrastructure
Ans. Following are key differences between containers and serverless:

Supported host environments: Containers can run on any modern Linux server, as well as certain versions of Windows. In contrast, serverless runs on specific host platforms, most of which are based in the public cloud (like AWS Lambda or Azure Functions).

Self-servicing ability. For the reasons just noted, in most cases, serverless functions require you to use a public cloud. (There are on-premises serverless frameworks, like Fn, but these are not yet widely used.) With containers, you can set up your own on-premises host environment, or use a public cloud service like ECS.

Cost. Because serverless environments are hosted in the cloud, you have to pay to use them. In contrast, you can set up a container environment yourself using open source code for free (although you’ll still have management costs, of course).

Supported languages. You can containerize an application written in any type of language as long as the host server supports the language. Serverless frameworks are different; they support a limited number of languages. The details of supported serverless language vary from serverless platform to platform.

Statefulness. Most serverless platforms are designed to support stateless workloads. (Some serverless providers offer limited support for stateful services; cf. Durable Functions on Azure.) Although you can connect to external storage services (like S3 on AWS) from within serverless platforms, the functions themselves cannot be stateful. Containers present their own persistent storage challenges, but creating stateful containerized apps is certainly possible.

Availability. Serverless functions are designed to run for a short period—usually, a few hundred seconds—before they shut down. Containers can run for as long as you need.

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 Q26. What are the distributed caches ?Server
 This question was recently asked at 'RiseSmart India'.This question is still unanswered. Can you please provide an answer.


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 Q27. How would you handle clustering on multiple servers? Server
 This question was recently asked at 'Sifi'.This question is still unanswered. Can you please provide an answer.


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