Centos7 新手，尝试使用以下命令安装 MariaDB：
sudo yum install mariadb-server mariadb
它输出的内容如下：
Loaded plugins: fastestmirror, langpacks, rhnplugin
This system is receiving updates from RHN Classic or Red Hat Satellite.
Loading mirror speeds from cached hostfile
Package mariadb-server is obsoleted by MariaDB-server, trying to install MariaDB-server-10.1.5-1.el7.centos.x86_64 instead
Package mariadb is obsoleted by MariaDB-client, trying to install MariaDB-client-10.1.5-1.el7.centos.x86_64 instead
Resolving Dependencies
--> Running transaction check
---> Package MariaDB-client.x86_64 0:10.1.5-1.el7.centos will be installed
---> Package MariaDB-server.x86_64 0:10.1.5-1.el7.centos will be installed
--> Processing Dependency: perl(Data::Dumper) for package: MariaDB-server-10.1.5-1.el7.centos.x86_64
--> Processing Dependency: perl(DBI) for package: MariaDB-server-10.1.5-1.el7.centos.x86_64
--> Processing Dependency: libjemalloc.so.1()(64bit) for package: MariaDB-server-10.1.5-1.el7.centos.x86_64
--> Running transaction check
---> Package jemalloc.x86_64 0:3.6.0-1.el7 will be installed
---> Package perl-DBI.x86_64 0:1.627-4.el7 will be installed
--> Processing Dependency: perl(RPC::PlServer) >= 0.2001 for package: perl-DBI-1.627-4.el7.x86_64
--> Processing Dependency: perl(RPC::PlClient) >= 0.2000 for package: perl-DBI-1.627-4.el7.x86_64
---> Package perl-Data-Dumper.x86_64 0:2.145-3.el7 will be installed
--> Running transaction check
---> Package perl-PlRPC.noarch 0:0.2020-14.el7 will be installed
--> Processing Dependency: perl(Net::Daemon) >= 0.13 for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Net::Daemon::Test) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Net::Daemon::Log) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Compress::Zlib) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Running transaction check
---> Package perl-IO-Compress.noarch 0:2.061-2.el7 will be installed
--> Processing Dependency: perl(Compress::Raw::Zlib) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch
--> Processing Dependency: perl(Compress::Raw::Bzip2) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch
---> Package perl-Net-Daemon.noarch 0:0.48-5.el7 will be installed
--> Running transaction check
---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 will be installed
---> Package perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================
Package Arch Version Repository Size
=====================================================================
Installing:
MariaDB-client x86_64 10.1.5-1.el7.centos centos7-x86_64-mariadb-10-1
37 M
MariaDB-server x86_64 10.1.5-1.el7.centos centos7-x86_64-mariadb-10-1
92 M
Installing for dependencies:
jemalloc x86_64 3.6.0-1.el7 centos7-x86_64-mariadb-10-1
104 k
perl-Compress-Raw-Bzip2
x86_64 2.061-3.el7 centos7-x86_64 32 k
perl-Compress-Raw-Zlib
x86_64 1:2.061-4.el7 centos7-x86_64 57 k
perl-DBI x86_64 1.627-4.el7 centos7-x86_64 802 k
perl-Data-Dumper x86_64 2.145-3.el7 centos7-x86_64 47 k
perl-IO-Compress noarch 2.061-2.el7 centos7-x86_64 260 k
perl-Net-Daemon noarch 0.48-5.el7 centos7-x86_64 51 k
perl-PlRPC noarch 0.2020-14.el7 centos7-x86_64 36 k
Transaction Summary
=====================================================================
Install 2 Packages (+8 Dependent packages)
Total size: 131 M
Installed size: 557 M
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/7/centos7-x86_64-mariadb-10-1/packages/jemalloc-3.6.0-1.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY
Public key for jemalloc-3.6.0-1.el7.x86_64.rpm is not installed
jemalloc-3.6.0-1.el7.x86_64.rpm无法安装怎么办？我做错了什么？
答案1
您安装了 MariaDB（测试版）的第三方存储库，但未安装该存储库的 GPG 公钥。返回到您获取它的地方，并按照其指示获取和安装公钥。