Elastic
- What is the Elastic Stack?
- Explain what is Elasticsearch
- What is Logstash?
- Explain what beats are
- What is Kibana?
- 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
Elasticsearch
- What is a data node?
- What is a master node?
- What is an ingest node?
- What is Coordinating node?
- How data is stored in elasticsearch?
- What is an Index?
- Explain Shards
- What is an Inverted Index?
- What is a Document?
- 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?
- 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
- What reserved fields a document has?
- Explain Mapping
- What are the advantages of defining your own mapping? (or: when would you use your own mapping?)
- Explain Replicas
- Can you explain Term Frequency & Document Frequency?
- You check “Current Phase” under “Index lifecycle management” and you see it’s set to “hot”. What does it mean?
- What this command does? curl -X PUT “localhost:9200/customer/_doc/1?pretty” -H ‘Content-Type: application/json’ -d'{ “name”: “John Doe” }’
- What will happen if you run the previous command twice? What about running it 100 times?
- What is the Bulk API? What would you use it for?
- Query DSL
- Explain Elasticsearch query syntax (Booleans, Fields, Ranges)
- Explain what is Relevance Score
- Explain Query Context and Filter Context
- Describe how would an architecture of production environment with large amounts of data would be different from a small-scale environment
Logstash
- What are Logstash plugins? What plugins types are there?
What is grok? - How grok works?
- What grok patterns are you familiar with?
- What is
_grokparsefailure? - How do you test or debug grok patterns?
- What are Logstash Codecs? What codecs are there?
Kibana
- What can you find under “Discover” in Kibana?
- You see in Kibana, after clicking on Discover, “561 hits”. What does it mean?
- What can you find under “Visualize”?
- What visualization types are supported/included in Kibana?
- What visualization type would you use for statistical outliers
- Describe in detail how do you create a dashboard in Kibana
Filebeat
- What is Filebeat?
- If one is using ELK, is it a must to also use filebeat? In what scenarios it’s useful to use filebeat?-
- What is a harvester?
- True or False? a single harvester harvest multiple files, according to the limits set in filebeat.yml
- What are filebeat modules?
Elastic Stack
- How do you secure an Elastic Stack?
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