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server-administration:upgrade-centos-4-to-5 [2010-11-01 18:39:07]
garrett.plasky Approved 		server-administration:upgrade-centos-4-to-5 [2014-02-11 02:08:30]
shaun.reitan
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-===== Upgrading CentOS 4.x to 5.x =====+===== Upgrading CentOS 32bit 4.x to 32bit 5.x =====
  
 We have found the following guide very useful in this process. This works for both dedicated servers as well as VPS nodes: We have found the following guide very useful in this process. This works for both dedicated servers as well as VPS nodes:
  
-[[http://planet.admon.org/howto/update-centos-4-to-centos-5-remotely/|CentOS Upgrade Guide]]+==== cPanel Servers ==== 
 +If your server has cPanel installed you first need to remove filesystem from the exclude line in /etc/yum.conf.  If you don't the yum upgrade procedures below will fail.
  
-Notes: 
-  - VPS nodes do not need to be restarted after the process is complete unless you are running a PV-grub kernel (pvgrub-* in your Kernel Options inside the VPS Manager). 
-  - As of the time of writing, [[http://rpm.pbone.net|pbone.net]] has all of the RPMs necessary for this upgrade. 
-  - cPanel servers can be successfully upgraded in this fashion, however third-party RPMs may need to be removed first. 
  
-{{tag>centos guide vps cpanel kernel}}+==== Setting file attributes ==== 
 + 
 +<code console> 
 +chattr -Ria /bin 
 +chattr -Ria /etc 
 +chattr -Ria /etc 
 +chattr -Ria /include 
 +chattr -Ria /lib 
 +chattr -Ria /sbin 
 +chattr -Ria /usr/bin 
 +chattr -Ria /usr/include 
 +chattr -Ria /usr/lib 
 +chattr -Ria /usr/libexec 
 +chattr -Ria /usr/local/bin 
 +chattr -Ria /usr/local/include 
 +chattr -Ria /usr/local/lib 
 +chattr -Ria /usr/local/sbin 
 +chattr -Ria /usr/sbin 
 +chattr -Ria /usr/share 
 +chattr -Ria /var/lib 
 +chattr -Ria /var/lock 
 +chattr -Ria /var/log 
 +chattr -Ria /var/run 
 +chattr -Ria /var/spool/repackage 
 +</code> 
 + 
 +==== Ensure CentOS 4.x is up-to-date ==== 
 + 
 +<code console> 
 +rpm --rebuilddb 
 +yum clean all 
 +yum update 
 +rm -f /var/lib/rpm/__db.00* 
 +rpm --rebuilddb 
 +</code> 
 + 
 +==== Remove and Install Packages ==== 
 + 
 +<code console> 
 +rpm -e lftp syslinux mkbootdisk 
 +rpm -Uvh http://vault.centos.org/5.0/os/i386/CentOS/centos-release-5-0.0.el5.centos.2.i386.rpm http://vault.centos.org/5.0/os/i386/CentOS/centos-release-notes-5.0.0-2.i386.rpm 
 +mv /etc/yum.repos.d/CentOS-Base.repo.rpmnew /etc/yum.repos.d/CentOS-Base.repo 
 +</code> 
 + 
 +==== Install CentOS5 Kernel ==== 
 + 
 +<code console> 
 +rpm -ivh --nodeps http://vault.centos.org/5.0/os/i386/CentOS/kernel-2.6.18-8.el5.i686.rpm http://vault.centos.org/5.0/os/i386/CentOS/kernel-devel-2.6.18-8.el5.i686.rpm 
 +</code> 
 + 
 + 
 +==== Remove Old Kernels ==== 
 +<code console> 
 +rpm -e $(rpm -qa | grep kernel | grep -v 2.6.18 | tr '\n' ' ') --nodeps 
 +</code> 
 + 
 +==== Remaining Packages Upgrade ==== 
 + 
 +<code console> 
 +rpm -e --justdb python-elementtree --nodeps 
 +yum clean all 
 +yum upgrade 
 +</code> 
 + 
 +==== Fix RPM System ==== 
 + 
 +<code console> 
 +rm -f /var/lib/rpm/__db.00* 
 +rpm --rebuilddb 
 +rpm -Uvh --force http://vault.centos.org/5.0/os/i386/CentOS/python-elementtree-1.2.6-5.i386.rpm http://vault.centos.org/5.0/os/i386/CentOS/python-sqlite-1.1.7-1.2.1.i386.rpm 
 +yum clean all 
 +</code> 
 + 
 +==== One Last Upgrade ==== 
 + 
 +<code console> 
 +yum upgrade 
 +</code> 
 + 
 +==== cPanel Servers Only ==== 
 + 
 +The filesystem and perl excludes have to be removed from the /etc/yum.conf otherwise you will see dependency issues. 
 + 
 +Once the upgrade has completed you will need to do the following so that the cPanel/WHM software picks up the version change. 
 + 
 +<code console> 
 +rm -f /var/cpanel/sysinfo.config 
 +/scripts/gensysinfo 
 +/scripts/upcp --force 
 +/scripts/mysqlup --force 
 +/scripts/easyapache --build 
 +</code> 
 + 
 + 
 + 
 + 
 + 
 +{{tag>centos guide cpanel}}