构建 Docker 图像时无法找到包

Question

在我的 Docker 容器构建过程中，我尝试使用 apt-get install 安装一些包。但是，该过程未能完成，因为找不到 4 个包中的 3 个。

Step 1 : RUN apt-get update  && apt-get install -y netcat  ca-certificates  build-essential  libssl-dev
 ---> Running in 38d22d97ec4a
Err http://http.debian.net jessie InRelease

Err http://http.debian.net jessie-updates InRelease

Err http://security.debian.org jessie/updates InRelease

Err http://http.debian.net jessie Release.gpg
  Could not resolve 'http.debian.net'
Err http://security.debian.org jessie/updates Release.gpg
  Could not resolve 'security.debian.org'
Err http://http.debian.net jessie-updates Release.gpg
  Could not resolve 'http.debian.net'
Reading package lists...
W: Failed to fetch http://http.debian.net/debian/dists/jessie/InRelease

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

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

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

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

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 netcat
E: Unable to locate package build-essential
E: Unable to locate package libssl-dev
Removing intermediate container 38d22d97ec4a
2015/08/10 12:03:07 The command [/bin/sh -c apt-get update  && apt-get install -y netcat  ca-certificates  build-essential  libssl-dev] returned a non-zero code: 100

起初，我认为这是我的基本映像的问题，但是我在另一个 VM 上构建容器没有问题。想法？

Answer 1

此问题与主机的网络配置有关。 eth0 接口配置不正确。以下命令帮助我确定这是一个 DNS 问题。

$ docker run --rm debian:jessie ping -c 5 google.com
ping: unknown host
$ docker run --rm debian:jessie ping -c 5 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=38 time=37.147 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=38 time=32.917 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=38 time=31.475 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=38 time=30.692 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=38 time=31.180 ms
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 30.692/32.682/37.147/2.352 ms

Answer 2

我在一个基于相同问题的较新问题中找到了这个答案，它为我解决了这个问题。

$ docker-machine restart default      # Restart the environment
$ eval $(docker-machine env default)  # Refresh your environment settings

答案由Mark Smith提供。

构建 Docker 图像时无法找到包

Unable to locate package while building Docker image

ubuntu

containers

apt-get

docker