问题

我试图Ubuntu的docker容器里安装libc6-dbg:i386，因为Valgrind需要使用它，但现在无法安装。

给出以下Dockerfile：

FROM ubuntu:14.04



MAINTAINER Me <xyz@example.com>



RUN apt-get update


RUN apt-get install libc6-dbg


RUN apt-get install libc6-dbg:i386

在Ubuntu 14.04桌面64位主机上：

sudo docker build .

我得到：

Step 0 : FROM ubuntu:14.04


 ---> 5506de2b643b


Step 1 : MAINTAINER Me <xyz@example.com>


 ---> Using cache


 ---> b1792911b80d


Step 2 : RUN apt-get update


 ---> Using cache


 ---> 5e3928c88aff


Step 3 : RUN apt-get install libc6-dbg


 ---> Running in ebd51fcb278b


Reading package lists...


Building dependency tree...


Reading state information...


The following NEW packages will be installed:


 libc6-dbg


0 upgraded, 1 newly installed, 0 to remove and 12 not upgraded.


Need to get 3452 kB of archives.


After this operation, 22.8 MB of additional disk space will be used.


Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libc6-dbg amd64 2.19-0ubuntu6.3 [3452 kB]


debconf: unable to initialize frontend: Dialog


debconf: (TERM is not set, so the dialog frontend is not usable.)


debconf: falling back to frontend: Readline


debconf: unable to initialize frontend: Readline


debconf: (This frontend requires a controlling tty.)


debconf: falling back to frontend: Teletype


dpkg-preconfigure: unable to re-open stdin: 


Fetched 3452 kB in 0s (5325 kB/s)


Selecting previously unselected package libc6-dbg:amd64.


(Reading database ... 11527 files and directories currently installed.)


Preparing to unpack .../libc6-dbg_2.19-0ubuntu6.3_amd64.deb ...


Unpacking libc6-dbg:amd64 (2.19-0ubuntu6.3) ...


Setting up libc6-dbg:amd64 (2.19-0ubuntu6.3) ...


 ---> fe4bf0f008db


Removing intermediate container ebd51fcb278b


Step 4 : RUN apt-get install libc6-dbg:i386


 ---> Running in 460cab3c4631


Reading package lists...


Building dependency tree...


Reading state information...


E: Unable to locate package libc6-dbg


2014/11/20 15:23:06 The command [/bin/sh -c apt-get install libc6-dbg:i386] returned a non-zero code: 100

在主机上，我可以安装libc6-dbg:i386，为什么在Docker容器内无法安装它？

答案1

解决这个问题所需要的信息是https://wiki.debian.org/Multiarch/HOWTO。

官方docker ubuntu映像以及phusion/baseimage中的Apt仅配置了对amd64的支持。

# dpkg --print-architecture


amd64


# dpkg --print-foreign-architectures


<no output>

解决这个问题的方法是，在apt-get update之前添加另一个体系结构：

# dpkg --add-architecture i386


# apt-get update


<lots of lines>


# apt-get install libc6-dbg:i386


Reading package lists... Done


Building dependency tree 


Reading state information... Done


The following extra packages will be installed:


 gcc-4.9-base:i386 libc6:i386 libgcc1:i386


Suggested packages:


 glibc-doc:i386 locales:i386


The following NEW packages will be installed:


 gcc-4.9-base:i386 libc6:i386 libc6-dbg:i386 libgcc1:i386


0 upgraded, 4 newly installed, 0 to remove and 21 not upgraded.


Need to get 7039 kB of archives.


After this operation, 26.4 MB of additional disk space will be used.


Do you want to continue? [Y/n] 

为了完整性，下面是最终的Dockerfile：

FROM ubuntu:14.04



MAINTAINER Me <xyz@example.com>



RUN dpkg --add-architecture i386


RUN apt-get update


RUN apt-get install libc6-dbg


RUN apt-get install libc6-dbg:i386

答案2

尝试在apt-get update前，在Dockerfile中添加以下行：

RUN echo"deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list