Linux在安装epel-release时报错：
[root@XWDBDEV01 ~]# yum install epel-release
已加载插件：fastestmirror, langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Determining fastest mirrors
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
pgdg-common/7/x86_64/signature | 198 B 00:00:00
pgdg-common/7/x86_64/signature | 2.9 kB 00:00:00 !!!
pgdg11/7/x86_64/signature | 198 B 00:00:00
pgdg11/7/x86_64/signature | 3.6 kB 00:00:00 !!!
pgdg12/7/x86_64/signature | 198 B 00:00:00
pgdg12/7/x86_64/signature | 3.6 kB 00:00:00 !!!
pgdg13/7/x86_64/signature | 198 B 00:00:00
pgdg13/7/x86_64/signature | 3.6 kB 00:00:00 !!!
pgdg14/7/x86_64/signature | 198 B 00:00:00
pgdg14/7/x86_64/signature | 3.6 kB 00:00:00 !!!
pgdg15/7/x86_64/signature | 198 B 00:00:00
pgdg15/7/x86_64/signature | 3.6 kB 00:00:00 !!!
updates | 2.9 kB 00:00:00
(1/10): epel/x86_64/group_gz | 99 kB 00:00:00
(2/10): epel/x86_64/updateinfo | 1.0 MB 00:00:00
(3/10): epel/x86_64/primary_db | 7.0 MB 00:00:00
(4/10): pgdg11/7/x86_64/primary_db | 524 kB 00:00:02
(5/10): pgdg12/7/x86_64/primary_db | 413 kB 00:00:02
(6/10): pgdg13/7/x86_64/primary_db | 335 kB 00:00:02
(7/10): pgdg15/7/x86_64/primary_db | 153 kB 00:00:00
(8/10): updates/7/x86_64/primary_db | 24 MB 00:00:00
(9/10): pgdg-common/7/x86_64/primary_db | 200 kB 00:00:03
(10/10): pgdg14/7/x86_64/primary_db | 245 kB 00:00:08
正在解决依赖关系
--> 正在检查事务
---> 软件包 epel-release.noarch.0.7-14 将被 安装
--> 解决依赖关系完成依赖关系解决=================================================================================================================================================================================Package 架构 版本 源 大小
=================================================================================================================================================================================
正在安装:epel-release noarch 7-14 epel 15 k事务概要
=================================================================================================================================================================================
安装 1 软件包总下载量：15 k
安装大小：25 k
Is this ok [y/d/N]: y
Is this ok [y/d/N]: Is this ok [y/d/N]: y
Downloading packages:
警告：/var/cache/yum/x86_64/7/epel/packages/epel-release-7-14.noarch.rpm: 头V4 RSA/SHA256 Signature, 密钥 ID 352c64e5: NOKEY ] 0.0 B/s | 0 B --:--:-- ETA
epel-release-7-14.noarch.rpm 的公钥尚未安装
epel-release-7-14.noarch.rpm | 15 kB 00:00:00
从 file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 检索密钥获取 GPG 密钥失败：[Errno 14] curl#37 - "Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7"
从字面上理解，只有能获取到GPG密钥，那应该就不会提示这个报错，这应该是一种解决方法。
这里要介绍的是另一种方法：添加参数：--nogpgcheck 在安装时，跳过公钥检查。
详见：
[root@XWDBDEV01 ~]# yum install -y epel-release --nogpgcheck
已加载插件：fastestmirror, langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Loading mirror speeds from cached hostfile
正在解决依赖关系
--> 正在检查事务
---> 软件包 epel-release.noarch.0.7-14 将被 安装
--> 解决依赖关系完成依赖关系解决=================================================================================================================================================================================Package 架构 版本 源 大小
=================================================================================================================================================================================
正在安装:epel-release noarch 7-14 epel 15 k事务概要
=================================================================================================================================================================================
安装 1 软件包总计：15 k
安装大小：25 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction正在安装 : epel-release-7-14.noarch 1/1
警告：/etc/yum.repos.d/epel.repo 已建立为 /etc/yum.repos.d/epel.repo.rpmnew 验证中 : epel-release-7-14.noarch 1/1 已安装:epel-release.noarch 0:7-14 完毕！
