Featured Post

SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

-
Image
 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A
Post a Comment

13 Tricky Kubernetes Os Interview Questions

-
THE tricky interview questions will simplify your job search - the listed questions are in the order of basic to midlevel skills. Kubernetes is an operating system built to work on Linux distributions for the sole purpose of Kubernetes Cluster.

13 Tricky Kubernetes Os Interview Questions
Kubernetes


13 Tricky Kubernetes Interview Questions.


These interview questions help you to recap before the interviews. Also, you can use this knowledge for your projects.



1. What is Kubernetes?


Kubernetes is OS (operating system) on the cloud, which oversees the cloud-native containerized apps. It is an orchestrator, which takes care of cloud apps - updates, rollback, scale-up, scale down, maintenance, etc.


2. What are Cloud-native apps?


These run on the cloud, which means on any cloud - private, public, hybrid. They also run in an on-premise datacenter.


The right answer is- applications designed and written in such a way that scale up or scale down as demand rises or fallen.


3. What are Containerized apps?


Containers, which have images of apps, The beauty of containerizations is portability. You can deploy on any cloud.


4. What is the background of Kubernetes?


Google developed the Kubernetes for its cloud use - written in Golang. In 2014, Google handed over this to CNCF (cloud-native computing foundation). Since then, it has become open-source.


5. What is the prime difference between Docker and Kubernetes?


Docker is, wherein you can create packages - packages to containers. In simple terms, Docker is a container manager wherein port applications to different regions - unit testing, integration testing, etc. 


In the cloud, you need a manager for containers. That is Kubernetes. Its role is to manage the containers deployed on the cloud.


Prime difference between Docker and Kubernetes?



6. What are the three basic things you can find in Kubernetes?


  1. Masters
  2. Nodes
  3. Apps (packaged in the form of a Container and wrapped in a Pod)


7. What is Masters in Kubernetes?


It is a control panel, 3 or 4 high available masters present in production Kubernetes apps. These Masters manage the Kubernetes-cluster nodes.


8. What are the nodes in Kubernetes?


The nodes are workers. Who is responsible for the Control pane (Masters). Also, they execute the work assigned by Masters and give feedback.


9. What are Apps in Kubernetes?


The Apps, which are developed by individual clients, deploy to the cloud in the form of packaged containers. Kubernetes will take care of these to run on the cloud as needed.


10. What are the three components of Nodes?


Those are Kubelet, Container run-time, Kube-proxy.


11. What is the desired-state?


While deploying apps, you need to define the desired state in the Kubernetes. When the App state changes, the Kubernetes will correct it.


12. What is Pod?


A Pod holds one or more containers of Apps. It is superior in terms of Kubernetes - in Vmware world, VM, and in Docker's world, Container.


13. What is the virtualization of Pods?


In the Kubernetes world, Pods will virtualize based on demand or fall.



Keep reading

Comments

Post a Comment

Thanks for your message. We will get back you.

Popular posts from this blog

How to Fix datetime Import Error in Python Quickly

-
Image
Here's a quick resolution for import datetime Python error . The reason is your .py python script name and datetime  are the same. I'll show you how this error happens and its resolution.   Here's the Resolution for ImportError I've created a script called 'datetime.py.' to check whether the minute value is 'odd' or not. During the import of my python script, I got the import error cannot import name datetime. My Script: datetime.py My script's intention is to find whether the minute value is odd or not. Python Logic from datetime import datetime odds = [ 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , 21 , 23 , 25 , 27 , 29 , 31 , 33 , 35 , 37 , 39 , 41 , 43 , 45 , 47 , 49 , 51 , 53 , 55 , 57 , 59 ] right_this_minute = datetime.today().minute if right_this_minute in odds: print ( "This minute seems a little odd." ) else : print ( "Not an odd minute." ) ImportError I have imported my datetime.py from Linux. It gives an error
Read more

Explained Ideal Structure of Python Class

-
Image
When you are designing a class, you need to ensure that the classification of its critical parts is outlined at the beginning. The clearer the initial design, the more performant and scalable the class is. Some of the components in the order in which they should be defined in the class are mentioned as follows. Ideal structure of a class Class variables Constants or default variables are usually defined at the top of the class. For someone who is reading the code, it comes as an easy-to-view consolidated list, and for the interpreter it ensures that all such variables are processed before diving into the main logic of the class, including any other Instance method or constructor. The __init__ method The __init__ method provides information about inputs needed and how to instantiate the class. It is also the constructor of the class, which the very first method called while initializing the class . Special Python methods These methods change the functionality of the class or provide add
Read more

How to Check Kafka Available Brokers

-
Image
Here's the command to check the list of brokers present in a Kafka Cluster. You can say the Broker is the heart of the Kafka cluster. In simple terms, it works as a process. The main function is to receive messages from publishers and gives permission to access messages by consumers. How to Check Available Brokers in Kafka Here is the command: linux$  ./zookeeper-shell.sh zookeeper-IPaddress:2181 | "ls /brokers/ids" Just use the above command to get the number of brokers present in your host (Kafka Cluster). What is Default Broker-id in Kafka  The default broker id is -1 . When you create a new broker, it adds to -1. Then, it gives a new broker id. The broker ids will be generated from  reserved.broker.max.id + 1. Types of broker ids. Use assigned Zookeeper generated broker id. According to Wiki: Kafka runs on a cluster of one or more servers (called brokers), and the partitions of all topics are distributed across the cluster nodes.  Additionally, partitions are replicat
Read more