build - Docker build 没有网络，但是 docker run 有

Question

如果我想构建我的 Dockerfile，它无法连接到网络或至少 DNS:

Sending build context to Docker daemon 15.95 MB
Sending build context to Docker daemon 
Step 0 : FROM ruby
 ---> eeb85dfaa855
Step 1 : RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
 ---> Running in ec8cbd41bcff
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/InRelease  

W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/InRelease  

W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease  

W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/Release.gpg  Could not resolve 'httpredir.debian.org'

W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/Release.gpg  Could not resolve 'httpredir.debian.org'

W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg  Could not resolve 'security.debian.org'

W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package build-essential
INFO[0001] The command "/bin/sh -c apt-get update -qq && apt-get install -y build-essential libpq-dev" returned a non-zero code: 100

但如果我通过 docker run 运行完全相同的命令，它就可以工作:

docker run --name="test" ruby /bin/sh -c 'apt-get update -qq && apt-get install -y build-essential libpq-dev'

有人知道，为什么 docker build 不起作用？我已经在 StackOverflow 上尝试了所有与 DNS 相关的提示，例如使用 --dns 8.8.8.8 等启动 docker。

提前致谢

Answer 1

使用以下命令检查主机上可用的网络:

docker network ls

然后选择一个你知道有效的，host一个可能是一个很好的候选人。

现在假设您在您的Dokerfile 可用的目录中。 ，建立你的图像附加标志--networks并更改 <image-name>和你的:

docker build . -t <image-name> --no-cache --network=host