[エラー対処] windows10 の docker で 「Error response from daemon」

コンカイハ, windows10のdockerで「Error response from daemon」となったので, その対処をしました。

環境

• windows10
• docker toolbox

エラー発生

docker run コマンドを打つだけで以下のようなエラーが出ました。

$ docker run --rm hello-world

Unable to find image 'hello-world:latest' locally

C:\Program Files\Docker Toolbox\docker.exe: Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on 10.0.2.3:53: read udp 10.0.2.15:39085->10.0.2.3:53: i/o timeout.

See 'C:\Program Files\Docker Toolbox\docker.exe run --help'.

対処

DNSの名前解決ができていないらしいので、Google Public DNS を追加します。

/etc/resolv.confにDNSを追加

/etc/resolv.confにnameserver 8.8.8.8を追加しましょう。
ここでは手っ取り早くワンライナーでできる方法とvmに入って操作する方法の2つを紹介します。

ワンライナー

以下のコマンドで一発でできます。

docker-machine ssh default "sudo sh -c 'echo \"nameserver 8.8.8.8\" >> /etc/resolv.conf'"

これでdocker run --rm hello-worldコマンドを打つとできました。

$ docker run --rm hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:b8ba256769a0ac28dd126d584e0a2011cd2877f3f76e093a7ae560f2a5301c00
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

vmに入って追加

まずvmの中に入ります。

docker-machine ssh default

その後、/etc/resolv.confにnameserver 8.8.8.8追加します。そのままだとpermissionがないのでsudoも使いましょう。

sudo vi /etc/resolv.conf #add "nameserver 8.8.8.8"

もしくはcatで追加します.

sudo sh -c 'echo "nameserver 8.8.8.8" >> /etc/resolv.conf'

終わったあとはexitして、docker run --rm hello-worldをやるとちゃんと動きました。

$ exit # vmから抜ける.
$ docker run --rm hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:b8ba256769a0ac28dd126d584e0a2011cd2877f3f76e093a7ae560f2a5301c00
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/