Shulou(Shulou.com)05/31 Report--

This article mainly introduces "Elasticsearch entry case analysis". In daily operation, I believe many people have doubts about Elasticsearch entry case analysis. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts of "Elasticsearch entry case analysis". Next, please follow the editor to study!

Elasticsearch is an open source search engine based on Apache Lucene (TM). Whether in open source or proprietary areas, Lucene can be considered to be by far the most advanced, best-performing, and most fully functional search engine library.

Characteristics

Distributed real-time file storage in which each field is indexed and searchable.

Distributed real-time analysis search engine-- irregular query

It can be expanded to hundreds of servers to deal with PB-level structured or unstructured data.

Elasticsearch also uses Java development and uses Lucene as its core to implement all indexing and search functions, but its goal is to hide the complexity of Lucene through simple RESTful API, thus making full-text search simple.

What can ES do?

Text retrieval (uniform fields), fuzzy query (search), data analysis (provide analysis syntax, such as aggregation)

2.1 preparation work

Install Centos7, recommended memory above 2G, install java1.8 environment, install docker

2.2 start the installation

1. Download elasticsearch+kibana

Docker pull elasticsearch:7.4.2docker pull kibana:7.4.2

2. Install ElasticSearch

Mkdir-p / mydata/elasticsearch/configmkdir-p / mydata/elasticsearch/datamkdir-p / mydata/elasticsearch/pluginsecho "http.host:0.0.0.0" > > / mydata/elasticsearch/config/elasticsearch.yml docker run-- name elasticsearch-p 9200 mydata/elasticsearch/pluginsecho 9200-p 9300 purl 9300\-e "discovery.type=single-node"\-e ES_JAVA_OPTS= "- Xms64m-Xmx512m"\-v / mydata/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml\-v / mydata/elasticsearch/data:/usr/share/elasticsearch/data\-v / mydata/elasticsearch/plugins:/usr/share/elasticsearch/plugins\-d elasticsearch:7.4.2

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Matters needing attention

After 1 minute, the elasticsearch in docker will abort, and use the following command to view the problem log

Docker logs elasticsearch

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Cause:

The mistake is that there is no space before and after the colon of the parameter. I have been looking for this problem for a long time.

Write http.host to elasticsearch.yml (note that it conforms to the yml specification, a space before k, a colon assignment, and a space between values and colons)

Echo "http.host:0.0.0.0" > > / mydata/elasticsearch/config/elasticsearch.yml

The second question

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Insufficient permissions, use

Chmod-R 777 / mydata/elasticsearch/

Restart, success!

At this point, the study of "case Analysis of getting started with Elasticsearch" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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