Discussion on: Learn Docker - from the beginning, part III databases and linking

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Hey, nice work!

Just one thing, I'm stuck on where we setup the network. I've created my network with

docker network create --driver bridge isolated

and then ran my containers with

docker run -d -p 8000:3000 --net isolated --name jayy jayywalker/node

docker run -p 8001:3306 --net isolated --name db -e MYSQL_ROOT_PASSWORD=dddd -d mysql

Of course since I've ran the app container before the mysql it won't find it, but even after restarting the app container I receive the following error:

/app/app.js:13
    throw err
    ^

Error: connect ETIMEDOUT
    at Connection._handleConnectTimeout (/app/node_modules/mysql/lib/Connection.js:412:13)
    at Object.onceWrapper (events.js:281:20)
    at Socket.emit (events.js:193:13)
    at Socket._onTimeout (net.js:450:8)
    at listOnTimeout (internal/timers.js:535:17)
    at processTimers (internal/timers.js:479:7)
    --------------------
    at Protocol._enqueue (/app/node_modules/mysql/lib/protocol/Protocol.js:144:48)
    at Protocol.handshake (/app/node_modules/mysql/lib/protocol/Protocol.js:51:23)
    at Connection.connect (/app/node_modules/mysql/lib/Connection.js:119:18)
    at Object.<anonymous> (/app/app.js:11:5)
    at Module._compile (internal/modules/cjs/loader.js:816:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:827:10)
    at Module.load (internal/modules/cjs/loader.js:685:32)
    at Function.Module._load (internal/modules/cjs/loader.js:620:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:877:12)
    at internal/main/run_main_module.js:21:11

It worked fine using link.

Michele delle Noci • Sep 10 '19

What string are you using as host in the node app? I've noticed that when you use networks instead of links you have to reference to other containers inside the networks by their names.