Docker does not work when DOCKER_HOST is specified in WSL2


When Docker for Desktop was running on Windows 10, docker that was running on ubuntu of WSL did not work on WSL2 because the environment variable DOCKER_HOST was specified. It works when unset DOCKER_HOST.


I was able to use docker with WSL, but it stopped working with WSL2.

$ docker ps                                                                           [~]
Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?

Docker is actually running, and you can see in Power Shell that port 2375 is free.

$ docker ps

$ Test-NetConnection -ComputerName localhost -Port 2375

ComputerName     : localhost
RemoteAddress    : ::1
RemotePort       : 2375
InterfaceAlias   : Loopback Pseudo-Interface 1
SourceAddress    : ::1
TcpTestSucceeded : True

WSL version check.

$ wsl -l -v
  NAME                   STATE           VERSION
* Ubuntu                 Running         2
  docker-desktop-data    Running         2
  docker-desktop         Running         2

The WSL version is 2, and docker-desktop is also working.

The cause is that the environment variable DOCKER_HOST was specified (in my case .zshrc).

export DOCKER_HOST=tcp://localhost:2375

Certainly WSL needed this. However, it is not necessary for WSL2. If you unset this, it will work.

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

moved. Congratulations.

I've been in great trouble personally, so I'll keep a record here for those who are in trouble for the same reason.


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