Elastic Questions | PrepOps.Dev

#1

What is the Elastic Stack?

#2

Explain what is Elasticsearch

#3

What is Logstash?

#4

Explain what beats are

#5

What is Kibana?

#6

Describe what happens from the moment an app logged some information until it's displayed to the user in a dashboard when the Elastic stack is used

#7

What is a data node?

#8

What is a master node?

#9

What is an ingest node?

#10

What is Coordinating only node?

#11

How data is stored in Elasticsearch?

#12

What is an Index?

#13

Explain Shards

#14

What is an Inverted Index?

#15

What is a Document?

#16

You check the health of your elasticsearch cluster and it's red. What does it mean? What can cause the status to be yellow instead of green?

#17

True or False? Elasticsearch indexes all data in every field and each indexed field has the same data structure for unified and quick query ability

#18

What reserved fields a document has?

#19

Explain Mapping

#20

What are the advantages of defining your own mapping? (or: when would you use your own mapping?)

#21

Explain Replicas

#22

Can you explain Term Frequency & Document Frequency?

#23

You check "Current Phase" under "Index lifecycle management" and you see it's set to "hot". What does it mean?

#24

What this command does? curl -X PUT "localhost:9200/customer/_doc/1?pretty" -H 'Content-Type: application/json' -d'{ "name": "John Doe" }'

#25

What will happen if you run the previous command twice? What about running it 100 times?

#26

What is the Bulk API? What would you use it for?

#27

Explain Elasticsearch query syntax (Booleans, Fields, Ranges)

#28

Explain what is Relevance Score

#29

Explain Query Context and Filter Context

#30

Describe how would an architecture of production environment with large amounts of data would be different from a small-scale environment

#31

What are Logstash plugins? What plugins types are there?

#32

What is grok?

#33

How grok works?

#34

What grok patterns are you familiar with?

#35

What is _grokparsefailure?

#36

How do you test or debug grok patterns?

#37

What are Logstash Codecs? What codecs are there?

#38

What can you find under "Discover" in Kibana?

#39

You see in Kibana, after clicking on Discover, "561 hits". What does it mean?

#40

What can you find under "Visualize"?

#41

What visualization types are supported/included in Kibana?

#42

What visualization type would you use for statistical outliers

#43

Describe in detail how do you create a dashboard in Kibana

#44

What is Filebeat?

#45

If one is using ELK, is it a must to also use filebeat? In what scenarios it's useful to use filebeat?

#46

What is a harvester?

#47

True or False? a single harvester harvest multiple files, according to the limits set in filebeat.yml

#48

What are filebeat modules?

#49

How do you secure an Elastic Stack?