First login to your CentOS server as the root user. Execute the command "yum update -y" and you should see output similar to the following:
# yum update -y
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: mirrors.kernel.org
* updates: mirrors.cmich.edu
* addons: mirror.stanford.edu
* extras: mirrors.usc.edu
base | 1.1 kB 00:00
primary.xml.gz | 878 kB 00:00
base 2508/2508
updates | 951 B 00:00
primary.xml.gz | 222 kB 00:04
updates 339/339
addons | 951 B 00:00
primary.xml.gz | 157 B 00:00
extras | 1.1 kB 00:00
primary.xml.gz | 100 kB 00:00
extras 311/311
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package cups-libs.i386 1:1.3.7-8.el5_3.6 set to be updated
---> Package nash.i386 0:5.1.19.6-44.1 set to be updated
---> Package audit-libs.i386 0:1.7.7-6.el5_3.3 set to be updated
etc..etc..
Complete!
After the updates are complete execute "yum update -y" a second time to ensure CentOS is up to date. You should see the following on your screen if your system is up to date:
# yum update -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.kernel.org
* updates: mirrors.cmich.edu
* addons: mirror.stanford.edu
* extras: mirrors.usc.edu
Setting up Update Process
No Packages marked for Update
After all updates have been applied it is recommended that you perform a soft reboot of your server using the "shutdown -r now" command from the shell prompt. This is to ensure you boot into any new kernels that YUM may have installed.
