动态DNS 实现

项目已放Github，欢迎Star。 https://github.com/MasonSRE/ddns

编写脚本获取公网IP地址，实时更新DNS记录

编写 get_ip_dns.py

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
import time
import logging
import requests
import json
from aliyunsdkcore.client import AcsClient
from aliyunsdkalidns.request.v20150109 import UpdateDomainRecordRequest
from aliyunsdkcore.acs_exception.exceptions import ServerException
from aliyunsdkalidns.request.v20150109 import DescribeDomainRecordsRequest, DescribeDomainRecordInfoRequest


# 阿里云API凭证
access_key_id = 'your_access_key_id'
access_key_secret = 'your_access_key_secret'
region_id = 'cn-hangzhou'  # 你的阿里云区域ID (可以不做修改)

# 域名和记录信息
domain_name = 'example.com'  # 你的域名
sub_domain = 'www'  # 子域名，例如www

# 设置日志记录
logging.basicConfig(level=logging.INFO)

def get_public_ip():
    try:
        response = requests.get('https://api.ipify.org?format=json')
        response.raise_for_status()  # 抛出HTTP错误
        ip = response.json()['ip']
        logging.info(f'Public IP retrieved: {ip}')
        return ip
    except requests.exceptions.RequestException as e:
        logging.error(f'Failed to retrieve public IP: {e}')
        return None

def get_current_dns_record(client, domain_name, sub_domain):
    request = DescribeDomainRecordsRequest.DescribeDomainRecordsRequest()
    request.set_DomainName(domain_name)
    try:
        response = client.do_action_with_exception(request)
        records = json.loads(response)['DomainRecords']['Record']
        for record in records:
            if record['RR'] == sub_domain and record['Type'] == 'A':
                return record['RecordId'], record['Value']
        return None, None
    except ServerException as e:
        logging.error(f'Failed to get the current DNS record: {e}')
        return None, None

def update_dns_record(client, record_id, sub_domain, ip):
    request = UpdateDomainRecordRequest.UpdateDomainRecordRequest()
    request.set_RecordId(record_id)
    request.set_RR(sub_domain)
    request.set_Type('A')
    request.set_Value(ip)
    try:
        client.do_action_with_exception(request)
        logging.info(f'Updated DNS record to {ip}')
    except ServerException as e:
        logging.error(f'Failed to update DNS record: {e}')

def add_dns_record(client, domain_name, sub_domain, ip):
    request = AddDomainRecordRequest.AddDomainRecordRequest()
    request.set_DomainName(domain_name)
    request.set_RR(sub_domain)
    request.set_Type('A')
    request.set_Value(ip)
    try:
        client.do_action_with_exception(request)
        logging.info(f'Added DNS record: {sub_domain}.{domain_name} -> {ip}')
    except ServerException as e:
        logging.error(f'Failed to add DNS record: {e}')

def update_dns_record_if_needed(client, domain_name, sub_domain, new_ip):
    record_id, current_ip = get_current_dns_record(client, domain_name, sub_domain)
    if record_id is None:
        logging.warning(f'No existing DNS record found for {sub_domain}.{domain_name}, adding a new record.')
        add_dns_record(client, domain_name, sub_domain, new_ip)
        return
    if current_ip != new_ip:
        update_dns_record(client, record_id, sub_domain, new_ip)

def main():
    client = AcsClient(access_key_id, access_key_secret, region_id)
    
    while True:
        new_ip = get_public_ip()
        if new_ip is not None:
            update_dns_record_if_needed(client, domain_name, sub_domain, new_ip)
        time.sleep(10)  # 等待10秒再检查

if __name__ == '__main__':
    main()

检查公网IP并更新 DNS 纪录

此脚本将获取该服务器的公网IP，并且修改阿里云对应的DNS解析的A纪录。

  • 非常适用于家用网络，公网IP改变时也会同步修改至Aliyun dns解析
  • 手动误修改此DNS解析时，也会进行操作IP对比，同时进行修改 dns 解析

1、下载依赖包

1
2
3
pip3 install requests
pip3 install aliyun-python-sdk-core
pip3 install aliyun-python-sdk-alidns

2、修改配置

1
2
3
4
5
6
7
8
# 阿里云API凭证
access_key_id = 'your_access_key_id'
access_key_secret = 'your_access_key_secret'
region_id = 'cn-hangzhou'  # 你的阿里云区域ID(可以不做修改)

# 域名和记录信息
domain_name = 'example.com'  # 你的域名
sub_domain = 'www'  # 子域名，例如www

3、运行脚本

1
python3 get_ip_dns.py