Mysql: forward host lookup failed: Unknown host

Question

我们在我们的应用程序中使用docker-compose，并且不熟悉应用程序的这一部分，我们在运行docker docker-compose up --build后收到此错误：

Mysql: forward host lookup failed: Unknown host

Answer 1

After an inspection to hosts list created by docker-compose:

$ docker network prune
$ docker network ls
$ docker network inspect <desired_network>

I noticed db was not there, so I tried to build it up and see what happens:

$ docker-compose run <desired_db_image>

Getting the correct output:

Initializing database

mkdir: cannot create directory '/var/lib/mysql//mysql': No space left on device

Fatal error Can't create database directory '/var/lib/mysql//mysql'

So you need to free some space :

$ docker system prune

Select: y