Telegraf can't connect to influxdb

I've tried to run the default sandbox app on both Windows 10 and Ubuntu 18.04.2 with the same result. Is this a problem with the sandbox app or my usage?

I clone and type `./sandbox up`

```
telegraf_1 | 2019-06-06T13:30:24Z I! Starting Telegraf 1.10.4
telegraf_1 | 2019-06-06T13:30:24Z I! Using config file: /etc/telegraf/telegraf.conf
telegraf_1 | 2019-06-06T13:30:24Z I! Loaded inputs: docker cpu system influxdb syslog mqtt_consumer
telegraf_1 | 2019-06-06T13:30:24Z I! Loaded aggregators:
telegraf_1 | 2019-06-06T13:30:24Z I! Loaded processors:
telegraf_1 | 2019-06-06T13:30:24Z I! Loaded outputs: influxdb
telegraf_1 | 2019-06-06T13:30:24Z I! Tags enabled: host=telegraf-getting-started
telegraf_1 | 2019-06-06T13:30:24Z I! [agent] Config: Interval:5s, Quiet:false, Hostname:"telegraf-getting-started", Flush Interval:5s
telegraf_1 | 2019-06-06T13:30:24Z W! [outputs.influxdb] when writing to [http://influxdb:8086]: database "telegraf" creation failed: Post http://influxdb:8086/query: dial tcp 172.19.0.2:8086: connect: connection refused
telegraf_1 | 2019-06-06T13:30:25Z E! [inputs.influxdb]: Error in plugin: [url=http://influxdb:8086/debug/vars]: Get http://influxdb:8086/debug/vars: dial tcp 172.19.0.2:8086: connect: connection refused
```