[英]"ConnectionError: connect ECONNREFUSED", cannot connect Node.js app and Elasticsearch database with Docker Compose
當我在 Docker 中的同一個橋接網絡上運行時,我試圖讓我的 Node.js 應用程序與我的 Elasticsearch 數據庫對話。 我使用 docker-compose.yml 文件進行配置。 這是相關的位和我收到的錯誤消息。
version: '3'
services:
express-app:
build: /path/to/app
container_name: my_app
depends_on:
- 'elasticsearch'
environment:
- NODE_ENV=local
- ES_HOST=elasticsearch
- PORT=3000
ports:
- 3000:3000
networks:
- backend
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch:7.6.0
container_name: es-master
environment:
- discovery.type=single-node
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
volumes:
- esdata:/usr/share/elasticsearch/data
ports:
- 9200:9200
- 9300:9300
networks:
- backend
volumes:
esdata:
driver: local
networks:
backend:
我想這兩個服務( express-app
和elasticsearch
是指被創建,“my_app_backend”,與他們的服務名稱泊塢橋網絡上發現的,官方泊塢窗文件指出,“服務是主機名到達。”我的意圖是在地址“ http://elasticsearch:9200 ”處訪問服務elasticsearch。
const { Client } = require('@elastic/elasticsearch');
const hostname = process.env.ES_HOST || 'localhost';
const client = new Client({
node: `http://${hostname}:9200`,
log: 'error'
});
async function checkConnection () {
let isConnected = false;
console.log('Connecting to host', hostname);
try {
const health = await client.cluster.health({});
console.log(health);
isConnected = true;
} catch (err) {
console.log('process.env.ES_HOST', process.env.ES_HOST);
console.log('Connection Failed\n', err);
}
}
checkConnection();
module.exports.client = client;
下面的消息顯示了 Node.js 應用程序嘗試通過 process.env.ES_HOST 變量“elasticsearch”(在 docker-compose.yml 文件中定義)連接到 Elasticsearch 並在容器運行時執行的結果。 錯誤消息顯示了我用來檢查變量是否具有正確值的幾個控制台日志。
ECONNREFUSED 后顯示的 IP 地址是 Docker 引擎替換“elasticsearch”的地址。 當我運行docker network inspect my_app_backend
輸出容器的網絡地址時,也可以找到這一點。
... (redacted)
"MacAddress": "02:42:ac:14:00:03",
"IPv4Address": "172.20.0.3/16",
"IPv6Address": ""
> NODE_ENV=production node ./server/index.js
Connecting to host elasticsearch
Server listening on port 3000!
process.env.ES_HOST elasticsearch
Connection Failed
ConnectionError: connect ECONNREFUSED 172.20.0.3:9200
at onResponse (/src/app/node_modules/@elastic/elasticsearch/lib/Transport.js:214:13)
at ClientRequest.<anonymous> (/src/app/node_modules/@elastic/elasticsearch/lib/Connection.js:98:9)
at ClientRequest.emit (events.js:311:20)
at Socket.socketErrorListener (_http_client.js:426:9)
at Socket.emit (events.js:311:20)
at emitErrorNT (internal/streams/destroy.js:92:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
at processTicksAndRejections (internal/process/task_queues.js:84:21) {
name: 'ConnectionError',
meta: {
body: null,
statusCode: null,
headers: null,
warnings: null,
meta: {
context: null,
request: [Object],
name: 'elasticsearch-js',
connection: [Object],
attempts: 3,
aborted: false
}
}
}
另外,我想指出應用程序在啟動時連接失敗,但是當我通過docker exec -it express-app sh
進入應用程序容器並編輯數據庫連接代碼並硬編碼數據庫的 IP 地址時(172.20.0.3 ),然后重新啟動node app,app成功連接數據庫。
在嘗試通過 docker-compose 實現完全自動化時,我做錯了什么? 這是 Elasticsearch 的一個怪癖還是我遺漏了一些非常明顯的東西? 預先感謝您的幫助!
使用container_name : es-master
,而不是elasticsearch
作為ES_HOST
ENV中express_app變量
ES_HOST : es-master
我認為你應該鏈接 elasticsearch 容器
version: '3'
services:
express-app:
build: /path/to/app
container_name: my_app
restart: always
depends_on:
- 'elasticsearch'
environment:
- NODE_ENV=local
- ES_HOST=elasticsearch
- PORT=3000
ports:
- 3000:3000
networks:
- backend
links:
- elasticsearch
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch:7.6.0
container_name: es-master
environment:
- discovery.type=single-node
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
volumes:
- esdata:/usr/share/elasticsearch/data
ports:
- 9200:9200
- 9300:9300
networks:
- backend
volumes:
esdata:
driver: local
networks:
backend:
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