How to Use Yum update in Fedora Core 6

Loading "installonlyn" plugin; existing lock/var/run/yum. PID: Another copy is running. Aborting.

After Fedora Core 6 is installed, it seems that you can directly use Yum to install the software.
[1]
Loading "installonlyn" plugin
Existing lock/var/run/yum. PID: Another copy is running. Aborting.

If the above error occurs, simply enter the following command and then run it.

[Root @ localhost ~] #/Etc/init. d/Yum-updatesd stop
Stop Yum-updatesd: [OK]

[2]
List available warehouse packages
# Yum list available

Upgrade System
# Yum update

Check available system updates
# Yum check-Update

Upgrade the kernel
# Yum update Kernel