dockerfile里或者在容器里執行yum，報錯，找不到源(invalid baseurl xxx)，但是宿主機上執行yum是沒問題的啊，為什么？

因為不論是dockerfile使用RUN關鍵字執行yum還是直接進入到容器里面執行yum，它們都是使用的docker鏡像里面的源(CentOS是在路徑/etc/yum.repo.d/CentOS-Base.repo)，所以你要把宿主機上的同路徑下的源拷貝到容器里面，然后docker commit一個新的“基礎鏡像”，這個時候使用docker build xxx(即使用Dockerfile的方式)就不會報錯了。

拷貝方法docker cp xxx xxx

內容擴展

dockerfile中執行yum操作報錯

我們先看下報錯信息：

Sending build context to Docker daemon 9.363 MB
Step 1 : FROM docker.io/centos
---> 196e0ce0c9fb
Step 2 : MAINTAINER liuliangliang
---> Using cache
---> 7d7e06799c20
Step 3 : ADD file/tomcat7.tgz /usr/local/
---> Using cache
---> 10ffdea53a02
Step 4 : RUN yum install java-1.8.0-openjdk -y
---> Running in 7824a339e077
Loaded plugins: fastestmirror, ovl

One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe 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 working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).

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

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

yum-config-manager --disable <repoid>
or
subscription-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 much
slower). If it is a very temporary problem though, this is often a nice
compromise:

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

Cannot find a valid baseurl for repo: base/7/x86_64
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=container error was
14: 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

解決方法：

這個你在resolv.conf文件里加上 DNS服務就行了 這個文件在/etc下， 加上

nameserver 8.8.8.8
nameserver 8.8.4.4
search localdomain

就行了

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