docker容器调用yum报错的解决办法

dockerfile里或者在容器里执行yum，报错，找不到源(invalid baseurl xxx)，但是宿主机上执行yum是没问题的啊，为什么？

因为不论是dockerfile使用RUN关键字执行yum还是直接进入到容器里面执行yum，它们都是使用的docker镜像里面的源(CentOS是在路径/etc/yum.repo.d/CentOS-Base.repo)，所以你要把宿主机上的同路径下的源拷贝到容器里面，然后docker commit一个新的“基础镜像”，这个时候使用docker build xxx(即使用Dockerfile的方式)就不会报错了。

拷贝方法docker cp xxx xxx

内容扩展

dockerfile中执行yum操作报错

我们先看下报错信息：

Sending build context to Docker daemon 9.363 MBStep 1 : FROM docker.io/centos---> 196e0ce0c9fbStep 2 : MAINTAINER liuliangliang---> Using cache---> 7d7e06799c20Step 3 : ADD file/tomcat7.tgz /usr/local/---> Using cache---> 10ffdea53a02Step 4 : RUN yum install java-1.8.0-openjdk -y---> Running in 7824a339e077Loaded plugins: fastestmirror, ovl

One of the configured repositories failed (Unknown),and yum doesn’t have enough cached data to continue. At this point the onlysafe thing yum can do is fail. There are a few ways to work 'fix' this:

1. Contact the upstream for the repository and get them to fix the problem.

2. Reconfigure the baseurl/etc. for the repository, to point to a workingupstream. This is most often useful if you are using a newerdistribution release than is supported by the repository (and thepackages for the previous distribution release still work).

3. Run the command with the repository temporarily disabledyum --disablerepo=<repoid> ...

4. Disable the repository permanently, so yum won’t use it by default. Yumwill then just ignore the repository until you permanently enable itagain or use --enablerepo for temporary usage:

yum-config-manager --disable <repoid>orsubscription-manager repos --disable=<repoid>

5. Configure the failing repository to be skipped, if it is unavailable.Note that yum will try to contact the repo. when it runs most commands,so will have to try and fail each time (and thus. yum will be be muchslower). If it is a very temporary problem though, this is often a nicecompromise:

yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=container error was14: curl#6 - 'Could not resolve host: mirrorlist.centos.org; Unknown error'The command ’/bin/sh -c yum install java-1.8.0-openjdk -y’ returned a non-zero code: 1

解决方法：

这个你在resolv.conf文件里加上 DNS服务就行了 这个文件在/etc下， 加上

nameserver 8.8.8.8nameserver 8.8.4.4search localdomain

就行了

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