1.安装wget

yum install -y wget

[vagrant@localhost ~]$ yum install -y wget Failed to set locale, defaulting to C Loaded plugins: fastestmirror Determining fastest mirrors  * base: mirrors.aliyun.com  * extras: mirrors.aliyun.com  * updates: mirrors.aliyun.com base                                                                                      | 3.6 kB  00:00:00 extras                                                                                    | 3.4 kB  00:00:00 updates                                                                                   | 3.4 kB  00:00:00 (1/4): extras/7/x86_64/primary_db                                                         | 215 kB  00:00:00 (2/4): base/7/x86_64/group_gz                                                             | 166 kB  00:00:02 (3/4): base/7/x86_64/primary_db                                                           | 6.0 MB  00:00:11 (4/4): updates/7/x86_64/primary_db                                                        | 7.4 MB  00:00:12 Resolving Dependencies --> Running transaction check ---> Package wget.x86_64 0:1.14-18.el7_6.1 will be installed --> Finished Dependency Resolution  Dependencies Resolved  =================================================================================================================  Package               Arch                    Version                            Repository                Size ================================================================================================================= Installing:  wget                  x86_64                  1.14-18.el7_6.1                    updates                  547 k  Transaction Summary ================================================================================================================= Install  1 Package  Total download size: 547 k Installed size: 2.0 M Downloading packages: warning: /var/cache/yum/x86_64/7/updates/packages/wget-1.14-18.el7_6.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY Public key for wget-1.14-18.el7_6.1.x86_64.rpm is not installed wget-1.14-18.el7_6.1.x86_64.rpm                                                           | 547 kB  00:00:00 Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 Importing GPG key 0xF4A80EB5:  Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"  Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5  Package    : centos-release-7-5.1804.el7.centos.x86_64 (@anaconda)  From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 Running transaction check Running transaction test Transaction test succeeded Running transaction   Installing : wget-1.14-18.el7_6.1.x86_64                                                                   1/1   Verifying  : wget-1.14-18.el7_6.1.x86_64                                                                   1/1  Installed:   wget.x86_64 0:1.14-18.el7_6.1  Complete!

2.备份

==mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup ==

[root@localhost vagrant]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

查询国内镜像源

打开阿里镜像 http://mirrors.aliyun.com/

下载CentOS-Base.repo到/etc/yum.repos.d/

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

[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo --2019-08-29 08:31:52--  http://mirrors.aliyun.com/repo/Centos-7.repo Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 114.80.24.201, 114.80.24.196, 114.80.24.199, ... Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|114.80.24.201|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 2523 (2.5K) [application/octet-stream] Saving to: '/etc/yum.repos.d/CentOS-Base.repo'  100%[=======================================================================>] 2,523       --.-K/s   in 0s  2019-08-29 08:31:54 (121 MB/s) - '/etc/yum.repos.d/CentOS-Base.repo' saved [2523/2523]

清除缓存

yum clean all

[root@localhost yum.repos.d]# yum clean all Failed to set locale, defaulting to C Loaded plugins: fastestmirror Cleaning repos: base extras updates Cleaning up everything Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos Cleaning up list of fastest mirrors

生存缓存

yum makecache

[root@localhost yum.repos.d]# yum makecache Failed to set locale, defaulting to C Loaded plugins: fastestmirror Determining fastest mirrors  * base: mirrors.aliyun.com  * extras: mirrors.aliyun.com  * updates: mirrors.aliyun.com http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30003 milliseconds') Trying other mirror. http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.cloud.aliyuncs.com; Unknown error" Trying other mirror. base                                                                                      | 3.6 kB  00:00:00 extras                                                                                    | 3.4 kB  00:00:00 updates                                                                                   | 3.4 kB  00:00:00 (1/12): base/7/x86_64/group_gz                                                            | 166 kB  00:00:00 (2/12): base/7/x86_64/primary_db                                                          | 6.0 MB  00:00:10 (3/12): extras/7/x86_64/prestodelta                                                       |  73 kB  00:00:00 (4/12): extras/7/x86_64/filelists_db                                                      | 249 kB  00:00:00 (5/12): extras/7/x86_64/primary_db                                                        | 215 kB  00:00:00 (6/12): extras/7/x86_64/other_db                                                          | 131 kB  00:00:00 (7/12): base/7/x86_64/filelists_db                                                        | 7.1 MB  00:00:13 (8/12): updates/7/x86_64/prestodelta                                                      | 945 kB  00:00:02 (9/12): base/7/x86_64/other_db                                                            | 2.6 MB  00:00:06 (10/12): updates/7/x86_64/filelists_db                                                    | 5.2 MB  00:00:14 (11/12): updates/7/x86_64/other_db                                                        | 764 kB  00:00:01 (12/12): updates/7/x86_64/primary_db                                                      | 7.4 MB  00:00:14 Metadata Cache Created