Upgrade CentOS 4.x to CentOS 5.x

Upgrade CentOS 4.x to CentOS 5.x

Note:

Current operating system: CentOS 4.x 64-bit

Purpose:

Use the yum command to upgrade CentOS 4.x to the latest CentOS 5.x version.

1. Upgrade CentOS 4.x to CentOS 4.9

Cd/etc/yum. repos. d/# enter the Directory

Mv CentOS-Base.repo CentOS-Base.repo-bak # Back up previous files

Wget http://vault.centos.org/4.9/centos-base.repo.pdf download the yum source file of centos 4.9

Yum clean all # Clear software packages in the cache directory

Rm-f/var/lib/rpm/_ db * # Delete rpm package data

Rpm -- rebuilddb # rebuilding rpm package data

Yum-y update # upgrade the system

Ii. Upgrade CentOS 4.9 to the latest CentOS 5.x version (currently CentOS 5.10)

Rpm-qa | grep kernel # view the current kernel of the system, as shown below:

######################################## #####

Kernel-smp-2.6.9-89.EL

Kernel-devel-2.6.9-100.EL

Kernel-smp-devel-2.6.9-100.EL

Kernel-2.6.9-100.EL

Kernel-smp-2.6.9-100.EL

Kernel-2.6.9-89.EL

Kernel-devel-2.6.9-89.EL

Kernel-smp-devel-2.6.9-89.EL

Kernel-largesmp-devel-2.6.9-100.EL

Kernel-utils-2.4-23.el4

Kernel-largesmp-devel-2.6.9-89.EL

Rpm-e -- nodeps -- justdb python-elementtree

######################################## #####

# Run the following command to delete the system kernel

Rpm-e -- nodeps -- justdb kernel-smp-2.6.9-89.EL

Rpm-e -- nodeps -- justdb kernel-devel-2.6.9-100.EL

Rpm-e -- nodeps -- justdb kernel-smp-devel-2.6.9-100.EL

Rpm-e -- nodeps -- justdb kernel-2.6.9-100.EL

Rpm-e -- nodeps -- justdb kernel-smp-2.6.9-100.EL

Rpm-e -- nodeps -- justdb kernel-2.6.9-89.EL

Rpm-e -- nodeps -- justdb kernel-devel-2.6.9-89.EL

Rpm-e -- nodeps -- justdb kernel-smp-devel-2.6.9-89.EL

Rpm-e -- nodeps -- justdb kernel-largesmp-devel-2.6.9-100.EL

Rpm-e -- nodeps -- justdb kernel-utils-2.4-23.el4

Rpm-e -- nodeps -- justdb kernel-largesmp-devel-2.6.9-89.EL

Rpm-e -- nodeps -- justdb python-elementtree

Note: The kernel must be deleted. Otherwise, the upgrade may fail. After deletion, run the rpm-qa | grep kernel command to view the kernel again.

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Cd/etc/yum. repos. d/# enter the Directory

# Download two installation packages for CentOS 5.10

Wget http://mirror.centos.org/centos/5/ OS /x86_64/CentOS/centos-release-5-10.el5.centos.x86_64.rpm

Wget http://mirror.centos.org/centos/5/ OS /x86_64/CentOS/centos-release-notes-5.10-0.x86_64.rpm

# Install a software package

Rpm-Uvh centos-release-notes-5.10-0.x86_64.rpm

Rpm-Uvh centos-release-5-10.el5.centos.x86_64.rpm

# Download the two installation packages of CentOS 5, which will be used later

Wget http://vault.centos.org/5.0/ OS /x86_64/CentOS/python-sqlite-1.1.7-1.2.1.x86_64.rpm

Wget http://vault.centos.org/5.9/ OS /SRPMS/python-sqlite-1.1.7-1.2.1.src.rpm

Cd/etc/yum. repos. d/# enter the Directory

Mv CentOS-Base.repo CentOS-Base.repo-4 # Back up previous files

Download the CentOS-Base.repo for CentOS 5 and upload it to/etc/yum. repos. d/

: Http://lug.ustc.edu.cn/wiki/_export/code/mirrors/help/centos? Codeblock = 1

Yum clean all # Clear software packages in the cache directory

Rm-f/var/lib/rpm/_ db * # Delete rpm package data

Rpm -- rebuilddb # rebuilding rpm package data

Yum-y remove *. {i386, i586, i686} # Delete the old software package. Important. Otherwise, the system upgrade fails.

Yum-y upgrade # upgrade the system

The following error may occur:

Error 1:

Error: Missing Dependency: python-abi = 2.3 is needed by package python-elementtree

Solution:

# Download the following Software Package

Wget http://vault.centos.org/4.4/ OS /x86_64/CentOS/RPMS/python-elementtree-1.2.6-4.2.1.x86_64.rpm

Rpm-e -- nodeps python-elementtree # Delete the current software package of the system

Rpm-Uvh -- nodeps python-elementtree-1.2.6-4.2.1.x86_64.rpm # install the software package just downloaded

Error 2:

Error: Missing Dependency: libttf. so.2 () (64bit) is needed by package bg5ps

Solution:

Yum-y remove bg5ps # Delete

Yum-y upgrade # continue to upgrade the system

After the upgrade is completed, the complete is displayed!

Iii. yum command repair

After the system is upgraded, the yum command cannot be used. perform the following repair:

Cd/etc/yum. repos. d/# enter the Directory

# Install the downloaded software package

Rpm-Uvh -- nodeps python-sqlite-1.1.7-1.2.1.x86_64.rpm

Rpm-ivh python-sqlite-1.1.7-1.2.1.src.rpm

Cd/usr/src/redhat/SPECS # enter the Directory

Rpmbuild-bb *. spec # create an rpm package

Cd/usr/src/redhat/RPMS/x86_64 # enter the Directory

# Install all packages in this directory

Rpm-Uvh -- force python-sqlite-debuginfo-1.1.7-1.2.1.x86_64.rpm

Rpm-Uvh -- force python-sqlite-1.1.7-1.2.1.x86_64.rpm

Iv. Set system startup parameters

Lsb_release-a # view the system version, as shown in

Rpm-qa | grep kernel # Check the system kernel. If not, run yum install kernel-PAE to install the kernel.

Cat/boot/grub. conf # view system startup settings, as shown in

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######################################## ##

Default = 0

Timeout = 5

Splashimage = (hd0, 0)/grub/splash.xpm.gz

Hiddenmenu

Title CentOS (2.6.18-371.9.1.el5)

Root (hd0, 0)

Kernel/vmlinuz-2.6.18-371.9.1.el5 ro root = LABEL =/1

Initrd/initrd-2.6.18-371.9.1.el5.img

######################################## ##

We can see that the new system kernel (2.6.18-371.9.1.el5) has been automatically added as the default startup.

Shutdown-r now # restart the system

Uname-a # view the current system kernel

So far, the latest version of CentOS 4.x to CentOS 5.x has been upgraded online.