1、官方指导说明：
https://mirrors.tuna.tsinghua.edu.cn/help/elrepo/
2、首先按照官网的安装说明，配置 ELRepo（即导入公钥）：
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
官网地址：
https://elrepo.org/tiki/tiki-index.php
3、接着，按照你的系统版本下载安装elrepo.repo 文件
RHEL-6, SL-6 或者 CentOS-6：
yum install https://www.elrepo.org/elrepo-release-6.el6.elrepo.noarch.rpm
RHEL-7, SL-7 或者 CentOS-7：
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
如果是 RHEL-8 或者 CentOS-8 则运行：
yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
此时的系统为Red Hat Enterprise Linux 7.6 ，故选择yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm，具体如下：
[root@localhost yum.repos.d]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
[root@localhost yum.repos.d]# yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Examining /var/tmp/yum-root-SHS66x/elrepo-release-7.el7.elrepo.noarch.rpm: elrepo-release-7.0-5.el7.elrepo.noarch
Marking /var/tmp/yum-root-SHS66x/elrepo-release-7.el7.elrepo.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package elrepo-release.noarch 0:7.0-5.el7.elrepo will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================================================================================================== Package Arch Version Repository Size
==============================================================================================================================================================================================================================Installing:
elrepo-release noarch 7.0-5.el7.elrepo /elrepo-release-7.el7.elrepo.noarch 5.0 k
Transaction Summary
==============================================================================================================================================================================================================================Install 1 Package
Total size: 5.0 k
Installed size: 5.0 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : elrepo-release-7.0-5.el7.elrepo.noarch 1/1
Verifying : elrepo-release-7.0-5.el7.elrepo.noarch 1/1
Installed:
elrepo-release.noarch 0:7.0-5.el7.elrepo
Complete!
4、备份 /etc/yum.repos.d/elrepo.repo ：
cp /etc/yum.repos.d/elrepo.repo /etc/yum.repos.d/elrepo.repo.bak
5、编辑 /etc/yum.repos.d/elrepo.repo 文件
在 mirrorlist= 开头的行前面加 # 注释掉；并将 elrepo.org/linux 替换mirrors.tuna.tsinghua.edu.cn/elrepo。
具体如下：
[root@localhost yum.repos.d]# cat elrepo.repo
### Name: ELRepo.org Community Enterprise Linux Repository for el7
### URL: https://elrepo.org/
[elrepo]
name=ELRepo.org Community Enterprise Linux Repository - el7
baseurl=https://mirrors.tuna.tsinghua.edu.cn/elrepo/elrepo/el7/$basearch/
#http://elrepo.org/linux/elrepo/el7/$basearch/
# http://mirrors.coreix.net/elrepo/elrepo/el7/$basearch/
# http://mirror.rackspace.com/elrepo/elrepo/el7/$basearch/
# http://linux-mirrors.fnal.gov/linux/elrepo/elrepo/el7/$basearch/
#mirrorlist=http://mirrors.elrepo.org/mirrors-elrepo.el7
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org
protect=0
[elrepo-testing]
name=ELRepo.org Community Enterprise Linux Testing Repository - el7
baseurl=https://mirrors.tuna.tsinghua.edu.cn/elrepo/testing/el7/$basearch/
#http://elrepo.org/linux/testing/el7/$basearch/
# http://mirrors.coreix.net/elrepo/testing/el7/$basearch/
# http://mirror.rackspace.com/elrepo/testing/el7/$basearch/
# http://linux-mirrors.fnal.gov/linux/elrepo/testing/el7/$basearch/
#mirrorlist=http://mirrors.elrepo.org/mirrors-elrepo-testing.el7
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org
protect=0
[elrepo-kernel]
name=ELRepo.org Community Enterprise Linux Kernel Repository - el7
baseurl=https://mirrors.tuna.tsinghua.edu.cn/elrepo/kernel/el7/$basearch/
#http://elrepo.org/linux/kernel/el7/$basearch/
# http://mirrors.coreix.net/elrepo/kernel/el7/$basearch/
# http://mirror.rackspace.com/elrepo/kernel/el7/$basearch/
# http://linux-mirrors.fnal.gov/linux/elrepo/kernel/el7/$basearch/
#mirrorlist=http://mirrors.elrepo.org/mirrors-elrepo-kernel.el7
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org
protect=0
[elrepo-extras]
name=ELRepo.org Community Enterprise Linux Extras Repository - el7
baseurl=https://mirrors.tuna.tsinghua.edu.cn/elrepo/extras/el7/$basearch/
#http://elrepo.org/linux/extras/el7/$basearch/
# http://mirrors.coreix.net/elrepo/extras/el7/$basearch/
# http://mirror.rackspace.com/elrepo/extras/el7/$basearch/
# http://linux-mirrors.fnal.gov/linux/elrepo/extras/el7/$basearch/
#mirrorlist=http://mirrors.elrepo.org/mirrors-elrepo-extras.el7
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org
protect=0
[root@localhost yum.repos.d]#
6、最后，更新软件包缓存
yum makecache
[root@localhost yum.repos.d]# yum makecache
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
elrepo | 3.0 kB 00:00:00
(1/3): elrepo/x86_64/filelists_db | 40 kB 00:00:01
(2/3): elrepo/x86_64/other_db | 32 kB 00:00:00
(3/3): elrepo/x86_64/primary_db | 390 kB 00:00:01
Metadata Cache Created
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