yum安装软件的时候经常出现找不到镜像的情况

https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 12] Timeout on

解决方法：更新/etc/yum.repos.d目录下的docker.repo文件内容，使用阿里的镜像源

[docker-ce-stable]

name=Docker CE Stable - $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/stable

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-stable-debuginfo]

name=Docker CE Stable - Debuginfo $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/stable

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-stable-source]

name=Docker CE Stable - Sources

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/stable

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-edge]

name=Docker CE Edge - $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/edge

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-edge-debuginfo]

name=Docker CE Edge - Debuginfo $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/edge

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-edge-source]

name=Docker CE Edge - Sources

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/edge

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test]

name=Docker CE Test - $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/test

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test-debuginfo]

name=Docker CE Test - Debuginfo $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/test

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test-source]

name=Docker CE Test - Sources

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/test

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly]

name=Docker CE Nightly - $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/nightly

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly-debuginfo]

name=Docker CE Nightly - Debuginfo $basearch

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/nightly

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly-source]

name=Docker CE Nightly - Sources

baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/nightly

enabled=

gpgcheck=

gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

如果是CentOS-Base.repo，则改成

 # CentOS-Base.repo

 #

 # The mirror system uses the connecting IP address of the client and the

 # update status of each mirror to pick mirrors that are updated to and

 # geographically close to the client.  You should use this for CentOS updates

 # unless you are manually picking other mirrors.

 #

 # If the mirrorlist= does not work for you, as a fall back you can try the

 # remarked out baseurl= line instead.

 #

 #

 [base]

 name=CentOS-$releasever - Base - mirrors.aliyun.com

 failovermethod=priority

 baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/

         http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/

         http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/

 gpgcheck=

 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

 #released updates

 [updates]

 name=CentOS-$releasever - Updates - mirrors.aliyun.com

 failovermethod=priority

 baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/

         http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/

         http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/

 gpgcheck=

 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

 #additional packages that may be useful

 [extras]

 name=CentOS-$releasever - Extras - mirrors.aliyun.com

 failovermethod=priority

 baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/

         http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/

         http://mirrors.cloud.aliyuncs.com/centos/$releasever/extras/$basearch/

 gpgcheck=

 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

 #additional packages that extend functionality of existing packages

 [centosplus]

 name=CentOS-$releasever - Plus - mirrors.aliyun.com

 failovermethod=priority

 baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/

         http://mirrors.aliyuncs.com/centos/$releasever/centosplus/$basearch/

         http://mirrors.cloud.aliyuncs.com/centos/$releasever/centosplus/$basearch/

 gpgcheck=

 enabled=

 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

 #contrib - packages by Centos Users

 [contrib]

 name=CentOS-$releasever - Contrib - mirrors.aliyun.com

 failovermethod=priority

 baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/

         http://mirrors.aliyuncs.com/centos/$releasever/contrib/$basearch/

         http://mirrors.cloud.aliyuncs.com/centos/$releasever/contrib/$basearch/

 gpgcheck=

 enabled=

 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

或者

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

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