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Connecting to a Cluster Using cURL Commands

Язык статьи: Английский
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To query or analyze data in Elasticsearch, you often need to connect to your cluster from an external client (such as an ECS). This topic describes how to use cURL commands to access an Elasticsearch cluster.

Prerequisites

  • The target Elasticsearch cluster is available.
  • An ECS has been created, and it is in the same VPC and security group as the CSS cluster.
    • If they are not in the same security group, modify the ECS security group, or configure the inbound and outbound rules of the group to allow all access from the cluster. For details, see the Virtual Private Cloud User Guide.
    • For details about how to use an ECS, see Elastic Cloud Server User Guide.

Accessing a Cluster

  1. Obtain the private network address of the cluster. It is used to access the cluster.

    This topic uses a private IP address as an example to describe how to access a cluster. The cluster access address varies with the network configurations used. For details, see Obtaining the Cluster Access Address.
    1. Log in to the CSS management console.
    2. In the navigation pane on the left, choose Clusters > Elasticsearch.
    3. In the cluster list, obtain the target cluster's internal network address from the Internal Network Address column. Typical address format: <host>:<port> or <host>:<port>,<host>:<port>. Example: 10.62.179.32:9200,10.62.179.33:9200.

      If the cluster has client nodes, only the IP addresses and ports of all the client nodes are displayed. Otherwise, the IP addresses and ports of all data nodes and cold data nodes are displayed.
  2. Run one of the following commands on the ECS to access the cluster. The access command varies according to the security mode of the cluster.
    • Cluster in non-security mode
      curl "http://<host>:<port>"
    • Cluster in security mode + HTTP
      curl -u <user>:<password> "http://<host>:<port>"
    • Cluster in security mode + HTTPS
      curl -u <user>:<password> -k "https://<host>:<port>"
    Table 1 Variables

    Variable

    Description

    host

    IP address of each node in the cluster. If the cluster contains multiple nodes, there will be multiple IP addresses. You can use any of them.

    port

    Port number for accessing a cluster node. Generally, the port number is 9200.

    user

    Username for accessing the cluster.

    password

    Password of the user.

    If the password contains special characters, enclose the username and password in single quotation marks, for example, curl -u "user:password!" "http://<host>:<port>".

    An access example is as follows:

     
    curl "http://10.62.176.32:9200"

    Information similar to the following is displayed:

     
    HTTP/1.1 200 OK
    content-type: application/json; charset=UTF-8
    content-length: 513
    

    {
    	"name" : "xxx-1",
    	"cluster_name" : "xxx",
    	"cluster_uuid" : "xxx_uuid",
    	"version" : {
    		"number" : "7.10.2",
    		"build_flavor" : "oss",
    		"build_type" : "tar",
    		"build_hash" : "unknown",
    		"build_date" : "unknown",
    		"build_snapshot" : true,
    		"lucene_version" : "8.7.0",
    		"minimum_wire_compatibility_version" : "6.7.0",
    		"minimum_index_compatibility_version" : "6.0.0-beta1"
    	},
    	"tagline" : "You Know, for Search"
    }

    For more commands, see the Elasticsearch documentation.
Parent topic: Connecting to Clusters
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