DevOps(Day-64) :INTERVIEW QUESTIONS ON AWS - Part2

 

  1. Can we recover the EC2 instance when we have lost the key?

    There are two ways:-

    • We can stop the instance detach the volume. Then create a new instance with a new key pair and attach the existing volume to it. Then we can finally launch the new instance and terminate the old instance.

    • Also, we can create an AMI from the existing instance and create a new instance out of that AMI. We can give a new keypair while creating the instance in the console.

  2. What is a gateway?

    A gateway is a node (router) in a computer network, a key stopping point for data on its way to or from other networks.

    In a workplace, the gateway is the computer that routes traffic from a workstation to the outside network that is serving up the Web pages. For basic Internet connections at home, the gateway is the Internet Service Provider that gives you access to the entire Internet.

  3. What is the difference between Amazon Rds, Dynamodb, and Redshift?

    Amazon RDS - Amazon Relational Database Service or Amazon RDS makes the task of setting up, scaling, and operating a relational database in the cloud. A lot of repetitive work occurs in managing a running database, which obviously becomes a bottleneck in staying ahead of your organizational growth.

    Amazon RDS ordinarily provides six database engines Amazon Aurora, Microsoft SQL Server, Oracle, MariaDB, PostgreSQL, and MySQL respectively. The users can continue to use their already existing tools. They can easily manage this without installing any kind of additional hardware or software. Amazon RDS can by default repair all the missing links of database software backups and take its own backup periodically. This is the reason it is considered to be the most cost-efficient, resizable and time-efficient.

    Dynamodb - As AWS DynamoDB usually works with bigger enterprise databases, so it may require some additional aids and administrations for effective data management. For this particular reason, AWS can essentially integrate DynamoDB with Elastic MapReduce or the EMR along with the help of AWS Hadoop service and Redshift. One can also use EMOR or Amazon Redshift to resolve the large-scale issues or queries and for more concrete queries that are based on hash as well as hash-range can be accomplished by DynamoDB. In order to avoid any extra overhead difficulty to manage the partitioned domains, one can use DynamoDB because of one very good reason- It has no size limit.

    Redshift - Redshift- popularly known as the analytics database is suitable to maintain large data volume. It can manage the implementation of big or heavy queries easily against the large datasets and can be completely managed as well. The database is a seamless collection of several computing resources or you can say nodes. These computing nodes are prearranged in a group called clusters. From here the Amazon Redshift engine runs in every cluster that may have one or more databases.

  4. Do you prefer to host a website on S3? What's the reason if your answer is either yes or no?

    Yes, if it is a static website. When deploying a new website or application, I want to know that it's always up and available to users while also requiring no attention or maintenance from me. If you want your website to work this way too, use static website hosting. Skip all the hassle of dealing with VPSs, OS updates, patches, certificate expiration, etc. If you are running a small business website or a blog, this should be a no-brainer. AWS S3 provides a super-easy way to deploy a static site that will virtually always be available, never crash, and requires no maintenance.

Thanks for reading my article. Have a nice day.

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