在Docker中将Node-Red连接到Mariadb

如何解决在Docker中将Node-Red连接到Mariadb

晚上，

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

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        

蚊子到Node-Red的运行良好，并且我已经在mariadb中设置了数据库和表，但是我没有运气让Node-Red与Maria对话。让这个错误回到我身边。

Error: connect ECONNREFUSED 127.0.0.1:3306

有问题的节点红色节点如下：

[{"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":""}

在某种程度上有用的情况下，此处为全节点红色流。

[{"id":"ec0540ab.8b4e2","type":"tab","label":"MQTT_MYSQL_write","disabled":false,"info":""},{"id":"772011e7.51dd4","type":"mqtt in","name":"XDK1_Output","topic":"BCDS/XDK110/example/out","qos":"2","datatype":"utf8","broker":"ac9b691.6c35998","x":90,"wires":[["f7d34d6b.63919","8336338b.e648c"]]},{"id":"d0d7439f.9b88d","type":"debug","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":990,"wires":[]},{"id":"d79d4ae0.fcf958","type":"function","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,"wires":[["d93d7d2b.ee27f"]]},{"id":"9b43a338.781","type":"comment","name":"Log everything","info":"","x":100,"y":200,{"id":"d93d7d2b.ee27f",{"id":"f7d34d6b.63919","active":false,"complete":"payload","targetType":"msg","x":310,"y":180,{"id":"8336338b.e648c","type":"json","property":"payload","action":"str","pretty":true,"x":270,"y":300,"wires":[["cbee55ed.b7a668","d79d4ae0.fcf958"]]},{"id":"cbee55ed.b7a668","complete":"false","x":480,"y":380,{"id":"ac9b691.6c35998","type":"mqtt-broker","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":""},"tz":""}]

我尝试了端口和配置的各种组合，在将自己深入研究到一个漏洞之后，我只是重置了所有内容以从头开始。

任何见识都深表感谢！

编辑

我意识到这对面对相同图像的人来说不是一个非常有用的更新，但是最后我删除了该容器，然后再次从docker-compose开始运行，并且成功了。主只知道。工作原理是，在找到正确答案（使用“ mariadb”而不是“ localhost”）之前，我尝试尝试错误答案时遇到了麻烦。

解决方法

要记住的重要一点是，每个容器都具有自己的环回设备（lo，127.0.0.1），容器的主机也具有自己的环回设备，并且它们完全独立。

因此您不能从Node-RED容器中将MariaDB容器引用为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。