linux安装mysql，显示尚未安装gpg密钥

项目场景：

在CentOS7.6上安装mysql，使用的是yum安装的方式

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问题描述：

执行命令

[root@localhost srv]# yum install -y mysql-community-server

时，报如下错误

[root@localhost srv]# yum install -y mysql-community-server
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.ustc.edu.cn
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
mysql-connectors-community                                                          | 2.6 kB  00:00:00     
mysql-tools-community                                                               | 2.6 kB  00:00:00     
mysql57-community                                                                   | 2.6 kB  00:00:00     
(1/3): mysql-connectors-community/x86_64/primary_db                                 |  90 kB  00:00:00     
(2/3): mysql-tools-community/x86_64/primary_db                                      |  94 kB  00:00:00     
(3/3): mysql57-community/x86_64/primary_db                                          | 298 kB  00:00:00     
正在解决依赖关系
--> 正在检查事务
---> 软件包 mysql-community-server.x86_64.0.5.7.37-1.el7 将被 安装
--> 正在处理依赖关系 mysql-community-common(x86-64) = 5.7.37-1.el7，它被软件包 mysql-community-server-5.7.37-1.el7.x86_64 需要
--> 正在处理依赖关系 mysql-community-client(x86-64) >= 5.7.9，它被软件包 mysql-community-server-5.7.37-1.el7.x86_64 需要
--> 正在检查事务
---> 软件包 mysql-community-client.x86_64.0.5.7.37-1.el7 将被 安装
--> 正在处理依赖关系 mysql-community-libs(x86-64) >= 5.7.9，它被软件包 mysql-community-client-5.7.37-1.el7.x86_64 需要
---> 软件包 mysql-community-common.x86_64.0.5.7.37-1.el7 将被 安装
--> 正在检查事务
---> 软件包 mariadb-libs.x86_64.1.5.5.68-1.el7 将被 取代
--> 正在处理依赖关系 libmysqlclient.so.18()(64bit)，它被软件包 2:postfix-2.10.1-9.el7.x86_64 需要
--> 正在处理依赖关系 libmysqlclient.so.18(libmysqlclient_18)(64bit)，它被软件包 2:postfix-2.10.1-9.el7.x86_64 需要
---> 软件包 mysql-community-libs.x86_64.0.5.7.37-1.el7 将被 舍弃
--> 正在检查事务
---> 软件包 mysql-community-libs-compat.x86_64.0.5.7.37-1.el7 将被 舍弃
--> 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:
 mysql-community-libs                x86_64         5.7.37-1.el7           mysql57-community         2.4 M
      替换  mariadb-libs.x86_64 1:5.5.68-1.el7
 mysql-community-libs-compat         x86_64         5.7.37-1.el7           mysql57-community         1.2 M
      替换  mariadb-libs.x86_64 1:5.5.68-1.el7
 mysql-community-server              x86_64         5.7.37-1.el7           mysql57-community         174 M
为依赖而安装:
 mysql-community-client              x86_64         5.7.37-1.el7           mysql57-community          25 M
 mysql-community-common              x86_64         5.7.37-1.el7           mysql57-community         311 k

事务概要
===========================================================================================================
安装  3 软件包 (+2 依赖软件包)

总下载量：203 M
Downloading packages:
警告：/var/cache/yum/x86_64/7/mysql57-community/packages/mysql-community-common-5.7.37-1.el7.x86_64.rpm: 头V4 RSA/SHA256 Signature, 密钥 ID 3a79bd29: NOKEY
mysql-community-common-5.7.37-1.el7.x86_64.rpm 的公钥尚未安装
(1/5): mysql-community-common-5.7.37-1.el7.x86_64.rpm                               | 311 kB  00:00:00     
(2/5): mysql-community-libs-5.7.37-1.el7.x86_64.rpm                                 | 2.4 MB  00:00:01     
(3/5): mysql-community-libs-compat-5.7.37-1.el7.x86_64.rpm                          | 1.2 MB  00:00:00     
(4/5): mysql-community-client-5.7.37-1.el7.x86_64.rpm                               |  25 MB  00:00:05     
(5/5): mysql-community-server-5.7.37-1.el7.x86_64.rpm                               | 174 MB  00:00:32     
-----------------------------------------------------------------------------------------------------------
总计                                                                       5.7 MB/s | 203 MB  00:00:35     
从 file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql 检索密钥
导入 GPG key 0x5072E1F5:
 用户ID     : "MySQL Release Engineering "
 指纹       : a4a9 4068 76fc bd3c 4567 70c8 8c71 8d3b 5072 e1f5
 软件包     : mysql57-community-release-el7-7.noarch (@/mysql57-community-release-el7-7.noarch)
 来自       : /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql


mysql-community-libs-compat-5.7.37-1.el7.x86_64.rpm 的公钥尚未安装


 失败的软件包是：mysql-community-libs-compat-5.7.37-1.el7.x86_64
 GPG  密钥配置为：file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

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解决：

强制安装，在安装命令后加上 --nogpgcheck

yum install -y mysql-community-server--nogpgcheck