Public key for *.rpm is not installed
[root@RedHat mnt]# cd /opt/cdrom/Packages/
[root@RedHat Packages]# yum install google-chrome-stable_current_i386.rpm
Loaded plugins: refresh-packagekit, rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
base                                                     | 1.3 kB     00:00 ...
base/primary                                             | 1.3 MB     00:00 ...
base                                                                  2680/2680
Setting up Install Process
Examining google-chrome-stable_current_i386.rpm: google-chrome-stable-10.0.648.134-77917.i386
Marking google-chrome-stable_current_i386.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package google-chrome-stable.i386 0:10.0.648.134-77917 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package       Arch Version            Repository                          Size
================================================================================
Installing:
google-chrome-stable
               i386 10.0.648.134-77917 /google-chrome-stable_current_i386  83 M

Transaction Summary
================================================================================
Install       1 Package(s)
Upgrade       0 Package(s)

Total size: 83 M
Installed size: 83 M
Is this ok [y/N]: y
Downloading Packages:
warning: rpmts_HdrFromFdno: Header V4 DSA/SHA1 Signature, key ID 7fac5991: NOKEY


Public key for google-chrome-stable_current_i386.rpm is not installed

两种方法可以解决：

1.运行
[root@RedHat Packages]# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
可解决；

2.运行
[root@RedHat Packages]# yum.conf 文件,把里面的gpgcheck=1改为gpgcheck=0
(不推荐)。
注：方法2的效果很好

3.最好的解决办法：
加上"--nogpgcheck"参数
[root@RedHat Packages]# yum install google-chrome-stable_current_i386.rpm --nogpgcheck