Hi, <br><br>My all boxes are running CentOS 4.4. When They were running CentOS 4.3. it upgraded to CentOS 4.4 due to yum. <br><br>But, This time, My all boxes are still running CentOS 4.4. <br><br>I did below commands, But no luck yet. 
<br><br>[root@mailgw yum.repos.d]# yum update<br>Loading "protectbase" plugin<br>Setting up Update Process<br>Setting up repositories<br>Reading repository metadata in from local files<br>Excluding Packages from Red Hat Enterprise Linux 4 - i386 - ATrpms
<br>Finished<br>218 packages excluded due to repository protections<br>No Packages marked for Update/Obsoletion<br><br>[root@mailgw yum.repos.d]# yum upgrade<br>Loading "protectbase" plugin<br>Setting up Upgrade Process
<br>Setting up repositories<br>Reading repository metadata in from local files<br>Excluding Packages from Red Hat Enterprise Linux 4 - i386 - ATrpms<br>Finished<br>218 packages excluded due to repository protections<br>No Packages marked for Update/Obsoletion
<br><br>[root@mailgw yum.repos.d]# yum update kernel-smp<br>Loading "protectbase" plugin<br>Setting up Update Process<br>Setting up repositories<br>Reading repository metadata in from local files<br>Excluding Packages from Red Hat Enterprise Linux 4 - i386 - ATrpms
<br>Finished<br>218 packages excluded due to repository protections<br>Could not find update match for kernel-smp<br>No Packages marked for Update/Obsoletion<br><br>My all boxes still have below kernel. <br><br>[root@mailgw
 yum.repos.d]# uname -r<br>2.6.9-42.0.10.ELsmp<br><br>So I want to know how to upgrade to centOS 5 by using yum. <br><br>Pls note that I do not need a fresh install. <br><br><br>here are my .repo files. <br><br>[root@mailgw
 ~]# cat /etc/yum.repos.d/CentOS-Base.repo<br># CentOS-Base.repo<br>#<br># This file uses a new mirrorlist system developed by Lance Davis for CentOS.<br># The mirror system uses the connecting IP address of the client and the
<br># update status of each mirror to pick mirrors that are updated to and<br># geographically close to the client.  You should use this for CentOS updates<br># unless you are manually picking other mirrors.<br>#<br># If the mirrorlist= does not work for you, as a fall back you can try the
<br># remarked out baseurl= line instead.<br>#<br>#<br><br>[base]<br>name=CentOS-$releasever - Base<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo
</a> =os<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/os/$basearch/">http://mirror.centos.org/centos/$releasever/os/$basearch/</a><br>gpgcheck=1<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">
http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=1<br><br>#released updates<br>[update]<br>name=CentOS-$releasever - Updates<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">
http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo</a> =updates<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/updates/$basearch/">http://mirror.centos.org/centos/$releasever/updates/$basearch/
</a><br>gpgcheck=1<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=1<br><br>#packages used/produced in the build but not released<br>
[addons]<br>name=CentOS-$releasever - Addons<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo
</a> =addons<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/addons/$basearch/">http://mirror.centos.org/centos/$releasever/addons/$basearch/</a><br>gpgcheck=1<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">
http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=0<br><br>#additional packages that may be useful<br>[extras]<br>name=CentOS-$releasever - Extras<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">
http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo</a> =extras<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/extras/$basearch/">http://mirror.centos.org/centos/$releasever/extras/$basearch/
</a><br>gpgcheck=1<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=0<br><br>#additional packages that extend functionality of existing packages
<br>[centosplus]<br>name=CentOS-$releasever - Plus<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo
</a> =centosplus<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/centosplus/$basearch/">http://mirror.centos.org/centos/$releasever/centosplus/$basearch/</a><br>gpgcheck=1<br>enabled=0<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">
http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=0<br><br>#contrib - packages by Centos Users<br>[contrib]<br>name=CentOS-$releasever - Contrib<br>mirrorlist=<a href="http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo">
http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo</a> =contrib<br>#baseurl=<a href="http://mirror.centos.org/centos/$releasever/contrib/$basearch/">http://mirror.centos.org/centos/$releasever/contrib/$basearch/
</a><br>gpgcheck=1<br>enabled=0<br>gpgkey=<a href="http://mirror.centos.org/centos/RPM-GPG-KEY-centos4">http://mirror.centos.org/centos/RPM-GPG-KEY-centos4</a><br>protect=0<br><br>[root@mailgw ~]# cat /etc/yum.repos.d/extra.repo
<br>[dag]<br>name=Dag RPM Repository for Red Hat Enterprise Linux<br>baseurl= <a href="http://apt.sw.be/redhat/el$releasever/en/$basearch/dag">http://apt.sw.be/redhat/el$releasever/en/$basearch/dag</a><br>gpgcheck=1<br>enabled=1
<br>gpgkey= <a href="http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt">http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt</a><br>protect=0<br><br>[atrpms]<br>name=Red Hat Enterprise Linux $releasever - $basearch - ATrpms
<br>baseurl=<a href="http://dl.atrpms.net/el$releasever-$basearch/atrpms/stable">http://dl.atrpms.net/el$releasever-$basearch/atrpms/stable</a><br>gpgkey= <a href="http://ATrpms.net/RPM-GPG-KEY.atrpms">http://ATrpms.net/RPM-GPG-KEY.atrpms
</a><br>gpgcheck=1<br>exclude=perl-Compress-Zlib<br>protect=0<br><br>Pls help to so;ve this issue. <br clear="all"><br>-- <br>Thank you<br>Indunil Jayasooriya<br>