python实现consul的服务注册与注销

news2024/11/15 5:06:42

我在使用consul的时候主要用于prometheus的consul服务发现，把数据库、虚拟机信息发布到consul，prometheus通过consul拿到数据库、虚拟机信息去采集指标信息。

此篇文章前提是已经安装好consul服务以后，安装consul请参考二进制方式部署consul单机版进行安装。

1.consul模板

文件名：consul-register.json.template

{
  "ID": "{{ exporter_id }}",
  "Name": "{{ exporter_id }}",
  "Tags": [
    {% for tag in tags %}
    "{{ tag }}"{% if not loop.last %},{% endif %}
    {% endfor %}
  ],
  "Address": "{{ exporter_address }}",
  "Port": {{ exporter_port }},
  "Meta": {
    {% for key, value in labels.items() %}
    "{{ key }}":"{{ value }}"{% if not loop.last %},{% endif %}
    {% endfor %}
  },
  "EnableTagOverride": false,
  "Weights": {
    "Passing": 10,
    "Warning": 1
  }
}

2.consul服务注册

import json
import os

import requests
from jinja2 import Environment, FileSystemLoader


class Config:
    PROJECT_DIR = os.path.dirname(os.path.abspath(__file__))
    # 配置文件地址，根据自身存放路径修改
    CONSUL_TEMPLATE_DIR = os.path.join(PROJECT_DIR, 'common/consul')


jinja_env = Environment(loader=FileSystemLoader(Config.CONSUL_TEMPLATE_DIR))
consul_register_template = jinja_env.get_template('consul-register.json.template')


def register_vhost_exporter_to_consul() -> None:
    print(f"register node exporter to consul.")
    host = "192.168.56.108"
    exporter_id = f'node-exporter-192.168.56.108'
    params = consul_register_template \
        .render(exporter_id=exporter_id,
                tags=['vhost', 'node', 'exporter', 'node-exporter'],
                exporter_address=host,
                exporter_port=49150,
                labels={
                    "host": host,
                    "bk_inst_id": 1,
                    "vh_oper_staff": 'test'
                })
    print(f"Start register svc: {exporter_id}")
    # http://192.168.56.108:8500为consul服务器地址
    resp = requests.put(f"http://192.168.56.108:8500/v1/agent/service/register",
                        json=json.loads(params),
                        verify=False)
    if not resp.ok:
        raise Exception(f"register svc {exporter_id} failed.")
    print(f"register svc {exporter_id} Success.")
    
    
if __name__ == '__main__':
    register_vhost_exporter_to_consul()

执行注册后，效果如下图
请添加图片描述

3.consul服务注销

import requests

def unregister_vhost_exporter_from_consul():
    exporter_id = f'node-exporter-192.168.56.108'
    resp = requests.put(f"http://192.168.56.108:8500/v1/agent/service/deregister/{exporter_id}",
                        verify=False)
    if not resp.ok and resp.status_code != 404:
        # 404说明已经取消注册过了
        raise Exception(f"unregister svc {exporter_id} failed.")


if __name__ == '__main__':
    unregister_vhost_exporter_from_consul()

注销后效果如下图
请添加图片描述