How to Update Nacos Service Instances Using a Python Script

First, import the required modules:

import json
import requests
import sys

Define the target Nacos URL for instance management:

url = 'http://<em>nacos-address</em>:8848/nacos/v2/ns/instance'

Read command‑line arguments for the service name, IP, port, weight, and namespace ID:

service_name = sys.argv[1]
ip = sys.argv[2]
port = sys.argv[3]
weight = sys.argv[4]
namespace_id = sys.argv[5]

Build the request payload, marking the instance as ephemeral:

data = {
    'serviceName': service_name,
    'ip': ip,
    'port': port,
    'weight': weight,
    'ephemeral': 'true',
    'namespaceId': namespace_id
}

Send the PUT request to Nacos and capture the response: response = requests.put(url, data=data) Print the raw response text and parse it as JSON:

print(response.text)
json_data = json.loads(response.text)
print(json_data)

Check the response code; if it is not zero, raise an error:

response_code = json_data["code"]
if response_code != 0:
    raise ValueError("下线异常")

Finally, output a success message: if the weight is "0" the instance is considered offline, otherwise it is online:

if weight == "0":
    print("服务:{} ip:{} 下线成功".format(service_name, ip))
else:
    print("服务:{} ip:{} 上线成功".format(service_name, ip))