Linux rpm installation software times wrong

Warning:yum-3.4.3-150.el7.noarch.rpm:header V3 rsa/sha256 Signature, key ID Fd431d51:nokey

error:failed dependencies:

Createrepo is needed by Yum-plugin-tmprepo-1.1.31-40.el7.noarch

This is due to yum installing the old version of the GPG keys, the solution is

Copy the code code as follows:
RPM--import/etc/pki/rpm-gpg/rpm*

Linux/centos Header V3 DSA signature:nokey, key ID Error resolution method

Add--force--nodeps to the back as
# RPM-IVH db4-devel-4.3.29-9.fc6.i386.rpm--force--nodeps

---to this step I have finished troubleshooting.

Follow-up online with the following additional steps:

Then prompt error:failed dependencies:
XINETD is needed by tftp-server-0.42-3.1.i386

Re-install RPM-IVH xinetd-2.3.14-10.el5.i386.rpm
#service xinetd Restart, or #service xinetd start.

Linux rpm installation software times wrong