YUM Update for a PUM Update/Upgrade Image

Installation of Repositories
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Once your vm is able to access the internet, install the public yum repository as follows:
1.    Login to your vm as the root user
2.    Issue the command:

[root@servername]# cd /etc/yum.repos.d
[root@servername]# wget http://public-yum.oracle.com/public-yum-el5.repo

Optional - Limiting Updates to Security Only

To install the security plugin, issue the following command:

[root@servername]# yum install yum-security

After the plugin is installed, to only perform security-related updates issue the command:

[root@servername]# yum --security update

For more information and options for using the yum security plugin, issue the command:

[root@servername]# man yum-security