在 Docker 中将 Node-Red 连接到 Mariadb

Question

晚上好，

设置一个相当简单的 Mosquitto -> Node-Red -> Mariadb 部署，来自 docker-compose。编写文件如下：

version: '3.8'

services:
        mqtt:
                container_name: mosquitto
                image: eclipse-mosquitto:latest
                restart: always
                ports: 
                    - "1883:1883"
                volumes:
                        - ./mosquitto.conf:/mosquitto/config/mosquitto.conf
                        - /mosquitto/data
                        - /mosquitto/log

        nodered:
                container_name: node-red
                image: nodered/node-red:latest
                restart: always
                ports: 
                    - "1880:1880"
                volumes:
                        - node_red_user_data:/data
                links:
                        - "mariadb:mariadb"

        mariadb:
                container_name: mariadb
                image: mariadb:latest
                restart: always
                command: --default-authentication-plugin=mysql_native_password
                ports: 
                    - "3306:3306"
                    - "33060:33060"
                environment:
                        - MYSQL_RANDOM_ROOT_PASSWORD=yes
                        - MYSQL_DATABASE=test
                        - MYSQL_USER=testuser
                        - MYSQL_PASSWORD=password

                volumes:
                        - mariadb_data_container:/var/lib/mysql

volumes:
        mariadb_data_container:
        node_red_user_data:
        mosquitto_persistence:


networks:
        default:
                name: primary        

Mosquitto 到 Node-Red 运行良好，我已经在 mariadb 中设置了数据库和表，但我没有任何运气让 Node-Red 与 Maria 对话。把这个错误抛给我。

Error: connect ECONNREFUSED 127.0.0.1:3306

有问题的Node-red节点如下：

[{"id":"d93d7d2b.ee27f","type":"mysql","z":"ec0540ab.8b4e2","mydb":"68416de0.8f91a4","name":"XDK Environmental Data","x":750,"y":260,"wires":[["d0d7439f.9b88d"]]},{"id":"68416de0.8f91a4","type":"MySQLdatabase","z":"","name":"Write to mariadb","host":"localhost","port":"3306","db":"XDK_FEM","tz":""}

这里有完整的 Node-red 流程，以防它在某种程度上有用。

[{"id":"ec0540ab.8b4e2","type":"tab","label":"MQTT_MYSQL_write","disabled":false,"info":""},{"id":"772011e7.51dd4","type":"mqtt in","z":"ec0540ab.8b4e2","name":"XDK1_Output","topic":"BCDS/XDK110/example/out","qos":"2","datatype":"utf8","broker":"ac9b691.6c35998","x":90,"y":260,"wires":[["f7d34d6b.63919","8336338b.e648c"]]},{"id":"d0d7439f.9b88d","type":"debug","z":"ec0540ab.8b4e2","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":990,"y":260,"wires":[]},{"id":"d79d4ae0.fcf958","type":"function","z":"ec0540ab.8b4e2","name":"Create query in topic","func":"var out = \"INSERT INTO XDK1_raw (timestamp,message)\"\nout = out + \"VALUES ('\" + new Date().toISOString() + \"','\" \nout = out + msg.payload + \"');\"\nmsg.topic=out;\n\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":500,"y":260,"wires":[["d93d7d2b.ee27f"]]},{"id":"9b43a338.781","type":"comment","z":"ec0540ab.8b4e2","name":"Log everything","info":"","x":100,"y":200,"wires":[]},{"id":"d93d7d2b.ee27f","type":"mysql","z":"ec0540ab.8b4e2","mydb":"68416de0.8f91a4","name":"XDK Environmental Data","x":750,"y":260,"wires":[["d0d7439f.9b88d"]]},{"id":"f7d34d6b.63919","type":"debug","z":"ec0540ab.8b4e2","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":310,"y":180,"wires":[]},{"id":"8336338b.e648c","type":"json","z":"ec0540ab.8b4e2","name":"","property":"payload","action":"str","pretty":true,"x":270,"y":300,"wires":[["cbee55ed.b7a668","d79d4ae0.fcf958"]]},{"id":"cbee55ed.b7a668","type":"debug","z":"ec0540ab.8b4e2","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":480,"y":380,"wires":[]},{"id":"ac9b691.6c35998","type":"mqtt-broker","z":"","name":"XDK_Mosquitto","broker":"192.168.1.115","port":"1883","clientid":"","usetls":false,"compatmode":false,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"68416de0.8f91a4","type":"MySQLdatabase","z":"","name":"Write to mariadb","host":"localhost","port":"3306","db":"XDK_FEM","tz":""}]

我尝试了各种端口和配置的组合，在将自己挖得更深之后，我只是重新设置了一切以从头开始。

感谢您的任何见解！

编辑

我意识到这对于面对相同图像的任何人来说都不是一个非常有用的更新，但最后我删除了容器并从 docker-compose 重新开始并且它起作用了。只有主知道。工作原理是，在找到正确答案之前（使用“mariadb”而不是“localhost”），我在尝试错误答案时破坏了一些东西。

Answer 1

要记住的重要一点是，每个容器都有自己的环回设备（lo，127.0.0.1），容器的主机也有自己的，它们都是完全独立的。

因此，您不能将 MariaDB 容器引用为 Node-RED 容器中的 127.0.0.1，因为该地址指向 Node-RED 容器。

在输入详细信息或 mariadb 配置节点时，您需要使用主机名 mariadb 而不是 127.0.0.1。