1、遇到问题
代码语言：javascript复制[root@node1 ~]# yum search docker
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
================================================================ Matched: docker ================================================================
subscription-manager-plugin-container.x86_64 : A plugin for handling container content.
[root@node1 ~]#redhat 默认自带的 yum 源需要注册，才能更新。我们想不花钱，需要替换掉redhat的yum源，最好是国内的源。
2、解决办法
CentOS几乎和redhat是一样的，所以无需担心软件包是否可安装，安装之后是否有问题。 但是更换CentOS源，坑很多，折腾了一上午，终于解决。 其中参考了博文：https://blog.csdn.net/hongbin_xu/article/details/79316614
（1）删除redhat自带的yum包
代码语言：javascript复制[root@node1 ~]# rpm -qa|grep yum|xargs rpm -e --nodeps
warning: /etc/yum/pluginconf.d/langpacks.conf saved as /etc/yum/pluginconf.d/langpacks.conf.rpmsave
[root@node1 ~]# rpm -qa |grep yum
[root@node1 ~]# [root@node1 ~]# rpm -qa|grep python-urlgrabber|xargs rpm -e --nodeps（2）下载yum软件包
从阿里镜像中查找需要的yum包
代码语言：javascript复制wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-42.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-langpacks-0.4.2-7.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-rhn-plugin-2.0.1-9.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/rpm-4.11.3-25.el7.x86_64.rpm（3）安装依赖
代码语言：javascript复制[root@node1 ~]# rpm -ivh python-urlgrabber-3.10-8.el7.noarch.rpm
warning: python-urlgrabber-3.10-8.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:python-urlgrabber-3.10-8.el7 ################################# [100%]
[root@node1 ~]#[root@node1 ~]# rpm -Uvh rpm-4.11.3-25.el7.x86_64.rpm --nodeps
warning: rpm-4.11.3-25.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:rpm-4.11.3-25.el7 ################################# [ 50%]
Cleaning up / removing...
2:rpm-4.11.3-21.el7 ################################# [100%]
[root@node1 ~]#（4）yum包
代码语言：javascript复制[root@node1 ~]# rpm -ivh yum-*
warning: yum-3.4.3-154.el7.centos.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:yum-metadata-parser-1.1.4-10.el7 ################################# [ 17%]
2:yum-plugin-fastestmirror-1.1.31-4################################# [ 33%]
3:yum-3.4.3-154.el7.centos ################################# [ 50%]
4:yum-langpacks-0.4.2-7.el7 ################################# [ 67%]
5:yum-rhn-plugin-2.0.1-9.el7 ################################# [ 83%]
6:yum-utils-1.1.31-42.el7 ################################# [100%]
[root@node1 ~]#3、更新源
下面更新源即可使用CentOS yum源了
代码语言：javascript复制[root@node1 ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo更新缓存时时报错
代码语言：javascript复制[root@node1 ~]# yum makecache
Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-
: manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
http://mirrors.aliyun.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article
https://access.redhat.com/articles/1320623
If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/$releasever/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; No route to host"
Trying other mirror.尝试CentOS-Base.repo内容更改为163的源
代码语言：javascript复制#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-$7 - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/7/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$7 - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$7 - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$7 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7[root@node1 yum.repos.d]# vi CentOS-Base.repo
[root@node1 yum.repos.d]# yum makecache
Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/12): base/x86_64/group_gz | 156 kB 00:00:05
(2/12): base/x86_64/filelists_db | 6.7 MB 00:00:06
(3/12): base/x86_64/other_db | 2.5 MB 00:00:00
(4/12): base/x86_64/primary_db | 5.7 MB 00:00:03
(5/12): extras/x86_64/prestodelta | 129 kB 00:00:05
(6/12): extras/x86_64/primary_db | 185 kB 00:00:00
(7/12): extras/x86_64/other_db | 121 kB 00:00:00
(8/12): extras/x86_64/filelists_db | 709 kB 00:00:10
(9/12): updates/x86_64/filelists_db | 4.2 MB 00:00:06
(10/12): updates/x86_64/prestodelta | 960 kB 00:00:06
(11/12): updates/x86_64/primary_db | 6.9 MB 00:00:01
(12/12): updates/x86_64/other_db | 734 kB 00:00:01
Determining fastest mirrors
Metadata Cache Created
[root@node1 yum.repos.d]# 
