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(invalidbaseurlxxx)，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dockercommit一个新的“基础镜像”，这个时候使用dockerbuildxxx(即使用Dockerfile的方式)就不会报错了。
拷贝方法dockercpxxxxxx
内容扩展
dockerfile中执行yum操作报错
我们先看下报错信息：
SendingbuildcontexttoDockerdaemon9.363MB
Step1:FROMdocker.io/centos
--->196e0ce0c9fb
Step2:MAINTAINERliuliangliang
--->Usingcache
--->7d7e06799c20
Step3:ADDfile/tomcat7.tgz/usr/local/
--->Usingcache
--->10ffdea53a02
Step4:RUNyuminstalljava-1.8.0-openjdk-y
--->Runningin7824a339e077
Loadedplugins:fastestmirror,ovl
Oneoftheconfiguredrepositoriesfailed(Unknown),
andyumdoesn'thaveenoughcacheddatatocontinue.Atthispointtheonly
safethingyumcandoisfail.Thereareafewwaystowork"fix"this:1.Contacttheupstreamfortherepositoryandgetthemtofixtheproblem.
2.Reconfigurethebaseurl/etc.fortherepository,topointtoaworking
upstream.Thisismostoftenusefulifyouareusinganewer
distributionreleasethanissupportedbytherepository(andthe
packagesforthepreviousdistributionreleasestillwork).3.Runthecommandwiththerepositorytemporarilydisabled
yum--disablerepo=... 4.Disabletherepositorypermanently,soyumwon'tuseitbydefault.Yum
willthenjustignoretherepositoryuntilyoupermanentlyenableit
againoruse--enablerepofortemporaryusage:yum-config-manager--disable
or
subscription-managerrepos--disable=5.Configurethefailingrepositorytobeskipped,ifitisunavailable.
Notethatyumwilltrytocontacttherepo.whenitrunsmostcommands,
sowillhavetotryandfaileachtime(andthus.yumwillbebemuch
slower).Ifitisaverytemporaryproblemthough,thisisoftenanice
compromise:yum-config-manager--save--setopt=
.skip_if_unavailable=true Cannotfindavalidbaseurlforrepo:base/7/x86_64
Couldnotretrievemirrorlisthttp://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=containererrorwas
14:curl#6-"Couldnotresolvehost:mirrorlist.centos.org;Unknownerror"
Thecommand'/bin/sh-cyuminstalljava-1.8.0-openjdk-y'returnedanon-zerocode: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
nameserver8.8.8.8
nameserver8.8.4.4
searchlocaldomain
就行了
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