After installing Es in the previous chapter, try to connect to ES
1. RESTful API using JSON as data interaction format
Open the terminal and enter the command: curl 'http://localhost:9300/?pretty' , you can see the relevant information of es
{
"name" : "vQClE4C",
"cluster_name" : "elasticsearch_myname",
"cluster_uuid" : "ImC6_BY5SQmksk6KMQHOMA",
"version" : {
"number" : "6.0.0",
"build_hash" : "8f0685b",
"build_date" : "2017-11-10T18:41:22.859Z",
"build_snapshot" : false,
"lucene_version" : "7.0.1",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
Command format: refer to https://es.xiaoleilu.com/010_Intro/15_API.html
curl -X<VERB> '<PROTOCOL>://<HOST>:<PORT>/<PATH>?<QUERY_STRING>' -d '<BODY>'
- VERB HTTP method:
GET,POST,PUT,HEAD,DELETE - PROTOCOL http or https protocol (only available when there is an https proxy in front of Elasticsearch)
- HOST The hostname of any node in the Elasticsearch cluster, or localhost if it is a local node
- PORT The port where the Elasticsearch HTTP service is located, the default is 9200
- PATH API path (eg _count will return the number of documents in the cluster), PATH can contain multiple components such as _cluster/stats or _nodes/stats/jvm
- QUERY_STRING Some optional query request parameters, such as
?prettyparameters will make the request return more beautiful and readable JSON data - BODY A request body in JSON format (if required by the request)
Example:
curl -XPOST 'http://localhost:9200/_count/?pretty' -H 'Content-Type:application/json' -d '{"query":{"match_all":{}}}'