Join-server returned error: http post error: Post "http://chirpstacd-application-server:8003": dial tcp: lookup chirpstacd-application-server on 127.0.0.11:53: no such hos

ChirpStack Application Server
1

OTAA join fail, what is that?

The whole chirpstack is built upon docker.

2

the error is telling you. It cannot find the host under the name you configured. Port 53 is usually DNS.
The name looks like a typo: chirpstacd -> chirpstack