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Connecting to a Cluster Using Python

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Язык статьи: Английский

When using CSS's Elasticsearch clusters for data query and management, developers traditionally rely on programming languages. However, directly working with Elasticsearch's HTTP APIs often involves complex and error-prone coding. To simplify development, CSS Elasticsearch supports the official Elasticsearch Python client. The client library (elasticsearch-py) provides comprehensive encapsulation of Elasticsearch APIs, enabling developers to perform index management, CRUD (Create, Read, Update, Delete) operations, and document searches through native Python APIs. For further information, see Elasticsearch Python Client.

Prerequisites

The target Elasticsearch cluster is available.

The server that runs the Python code can communicate with the Elasticsearch cluster.

Depending on the network configuration method used, obtain the cluster access address. For details, see Obtaining the Cluster Access Address.

Python 3 has been installed on the server.

Installing the Python Client Library

Install the Python client library on the server that runs the Python code. To ensure better compatibility, use a Python client library that has the same version as the target Elasticsearch cluster.

Replace 7.10 with the actual Python client version.

pip install Elasticsearch==7.10

Connecting to a Cluster

The sample code varies depending on the security mode settings of the target Elasticsearch cluster. Select the right reference document based on your service scenario.

Table 1 Cluster access scenarios
Elasticsearch Cluster Security-Mode Settings	Details
Non-security mode	Connecting to a Non-Security Mode Cluster with the Elasticsearch Python Client
Security mode + HTTP	Connecting to a Security-Mode+HTTP Cluster with the Elasticsearch Python Client
Security mode + HTTPS	Connecting to a Security-Mode+HTTPS Cluster with the Elasticsearch Python Client

Connecting to a Non-Security Mode Cluster with the Elasticsearch Python Client

Use the Elasticsearch Python client to connect to an Elasticsearch cluster for which the security mode is disabled, and query whether the test index exists.

The following is an example of the code for creating a client instance using the cluster connection information:

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24from elasticsearch import Elasticsearch

class ElasticFactory(object):

    def __init__(self, host: list, port: str, username: str, password: str):
        self.port = port
        self.host = host
        self.username = username
        self.password = password

    def create(self) -> Elasticsearch:
        addrs = []
        for host in self.host:
            addr = {'host': host, 'port': self.port}
            addrs.append(addr)

        if self.username and self.password:
            elasticsearch = Elasticsearch(addrs, http_auth=(self.username, self.password))
        else:
            elasticsearch = Elasticsearch(addrs)
        return elasticsearch

es = ElasticFactory(["{cluster address}"], "9200", None, None).create()
print(es.indices.exists(index='test'))

This piece of code checks whether the test index exists in the cluster. If true (the index exists) or false (the index does not exist) is returned, it indicates that the cluster is connected.

Connecting to a Security-Mode+HTTP Cluster with the Elasticsearch Python Client

Use the Elasticsearch Python client to connect to a security-mode Elasticsearch cluster that uses HTTP, and query whether the test index exists.

The following is an example of the code for creating a client instance using the cluster connection information:

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24from elasticsearch import Elasticsearch

class ElasticFactory(object):

    def __init__(self, host: list, port: str, username: str, password: str):
        self.port = port
        self.host = host
        self.username = username
        self.password = password

    def create(self) -> Elasticsearch:
        addrs = []
        for host in self.host:
            addr = {'host': host, 'port': self.port}
            addrs.append(addr)

        if self.username and self.password:
            elasticsearch = Elasticsearch(addrs, http_auth=(self.username, self.password))
        else:
            elasticsearch = Elasticsearch(addrs)
        return elasticsearch

es = ElasticFactory(["xxx.xxx.xxx.xxx"], "9200", "username", "password").create()
print(es.indices.exists(index='test'))

Table 2 Variables
Parameter	Description
host	IP address for accessing the cluster. If there are multiple IP addresses, separate them using a comma (,).
port	Access port of the cluster. Enter 9200.
username	Username for accessing the cluster.
password	Password of the user.

This piece of code checks whether the test index exists in the cluster. If true (the index exists) or false (the index does not exist) is returned, it indicates that the cluster is connected.

Connecting to a Security-Mode+HTTPS Cluster with the Elasticsearch Python Client

Use the Elasticsearch Python client to connect to a security-mode Elasticsearch cluster that uses HTTPS, and query whether the test index exists.

The following is an example of the code for creating a client instance using the cluster connection information:

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27from elasticsearch import Elasticsearch
import ssl

class ElasticFactory(object):

    def __init__(self, host: list, port: str, username: str, password: str):
        self.port = port
        self.host = host
        self.username = username
        self.password = password

    def create(self) -> Elasticsearch:
        context = ssl._create_unverified_context()

        addrs = []
        for host in self.host:
            addr = {'host': host, 'port': self.port}
            addrs.append(addr)

        if self.username and self.password:
            elasticsearch = Elasticsearch(addrs, http_auth=(self.username, self.password), scheme="https", ssl_context=context)
        else:
            elasticsearch = Elasticsearch(addrs)
        return elasticsearch

es = ElasticFactory(["xxx.xxx.xxx.xxx"], "9200", "username", "password").create()
print(es.indices.exists(index='test'))

Table 3 Variables
Parameter	Description
host	IP address for accessing the cluster. If there are multiple IP addresses, separate them using a comma (,).
port	Access port of the cluster. Enter 9200.
username	Username for accessing the cluster.
password	Password of the user.

This piece of code checks whether the test index exists in the cluster. If true (the index exists) or false (the index does not exist) is returned, it indicates that the cluster is connected.

Parent topic: Connecting to Clusters

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