linux centos7 yum 报错 Public key for *.rpm is not installed 解决方法

报错信息：

[root@localhost backup]# yum -y install net-snmp
Loaded plugins: fastestmirror
Repository base is listed more than once in the configuration
Repository addons is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
Loading mirror speeds from cached hostfile* updates: centos.ustc.edu.cn
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package net-snmp.x86_64 1:5.3.2.2-9.el5_5.1 set to be updated
--> Processing Dependency: net-snmp-libs = 1:5.3.2.2-9.el5_5.1 for package: net-snmp
--> Processing Dependency: libsensors.so.3()(64bit) for package: net-snmp
--> Running transaction check
---> Package lm_sensors.x86_64 0:2.10.7-9.el5 set to be updated
---> Package net-snmp-libs.i386 1:5.3.2.2-9.el5_5.1 set to be updated
---> Package net-snmp-libs.x86_64 1:5.3.2.2-9.el5_5.1 set to be updated
--> Finished Dependency ResolutionDependencies Resolved===================================================================================================================================================Package                              Arch                          Version                                    Repository                     Size
===================================================================================================================================================
Installing:net-snmp                             x86_64                        1:5.3.2.2-9.el5_5.1                        update                        702 k
Installing for dependencies:lm_sensors                           x86_64                        2.10.7-9.el5                               base                          525 k
Updating for dependencies:net-snmp-libs                        i386                          1:5.3.2.2-9.el5_5.1                        update                        1.3 Mnet-snmp-libs                        x86_64                        1:5.3.2.2-9.el5_5.1                        update                        1.3 MTransaction Summary
===================================================================================================================================================
Install       2 Package(s)
Upgrade       2 Package(s)Total size: 3.7 M
Downloading Packages:
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
update/gpgkey                                                                                                               | 1.8 kB     00:00    Public key for net-snmp-libs-5.3.2.2-9.el5_5.1.x86_64.rpm is not installed

在网上解决方法：

此时要导入rpm的签名信息即可

以root登录，执行下面命令
# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

Linux版本是CentOS 7.4

执行下面命令
#rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

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