HowTo: Upgrade CentOS Linux 6.4/6.3/6.2/6.1/6.0 to v6.5

CentOS Linux v6.5 has been released and available via repos for immediate update. The new version includes several hundred bug fixes for, and enhancements to the Linux kernel. How do I upgrade from CentOS Linux version 6.0 / 6.1 / 6.2 / 6.3 or 6.4 to the latest version 6.5?

You can only upgrade from minor release as CentOS does not support in-place upgrades between any major versions of CentOS Linux. However, a minor upgrade can be done easily and recommended for all users.

Back up any important data on the server/workstation

Make a backup – it cannot be stressed enough how important it is to make a backup of your system before you do this. You need to backup config files, user data stored in $HOME, pgsql/msyql/oracle and co databases, and web apps files. In short, backup all the data. Most of the actions listed in this post are written with the assumption that they will be executed by the root user running the bash or any other modern shell.

See your current CentOS release information

Type the following commands to see current version:
$ uname -mrs
$ cat /etc/redhat-release

Sample outputs:

CentOS release 6.4 (Final)

Show list of available updates

To list all packages with updates available with new release, enter:
# yum clean all
# yum check-update

# yum clean all
# yum list updates

Sample outputs:

Loaded plugins: downloadonly, fastestmirror, security
Loading mirror speeds from cached hostfile
 * base:
 * extras:
 * updates:
Updated Packages
abrt.x86_64                            2.0.8-21.el6.centos               base   
abrt-addon-ccpp.x86_64                 2.0.8-21.el6.centos               base   
abrt-addon-kerneloops.x86_64           2.0.8-21.el6.centos               base   
abrt-addon-python.x86_64               2.0.8-21.el6.centos               base   
abrt-cli.x86_64                        2.0.8-21.el6.centos               base  
sysvinit-tools.x86_64                  2.87-5.dsf.el6                    base   
udev.x86_64                            147-2.51.el6                      base   
util-linux-ng.x86_64                   2.17.2-12.14.el6                  base   
xmlrpc-c.x86_64                        1.16.24-1210.1840.el6             base   
xmlrpc-c-client.x86_64                 1.16.24-1210.1840.el6             base   
xorg-x11-drv-ati-firmware.noarch       7.1.0-3.el6                       base 

Note: Upgrade speed depends upon various factors such as the current system load, upstream rpm fetch server bandwidth and your Internet connection speed.

CentOS Linux: Upgrading your current system

Type the following yum command to upgrade:
# yum clean all
Sample outputs:

Loaded plugins: downloadonly, fastestmirror, security
Cleaning repos: base extras updates
Cleaning up Everything
Cleaning up list of fastest mirrors

To update, enter:
# yum update
Sample outputs:

Loaded plugins: downloadonly, fastestmirror, security
Determining fastest mirrors
 * base:
 * extras:
 * updates:
base                                                     | 3.7 kB     00:00     
base/primary_db                                          | 4.4 MB     00:01     
extras                                                   | 3.4 kB     00:00     
extras/primary_db                                        |  18 kB     00:00     
updates                                                  | 3.4 kB     00:00     
updates/primary_db                                       |  26 kB     00:00     
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package abrt.x86_64 0:2.0.8-16.el6.centos.1 will be updated
---> Package abrt.x86_64 0:2.0.8-21.el6.centos will be an update
---> Package abrt-addon-ccpp.x86_64 0:2.0.8-16.el6.centos.1 will be updated
---> Package abrt-addon-ccpp.x86_64 0:2.0.8-21.el6.centos will be an updateInstalling for dependencies:
 lzo                             x86_64 2.03-3.1.el6              base     55 k
 make                            x86_64 1:3.81-20.el6             base    389 k
 p11-kit                         x86_64 0.18.5-2.el6              base     94 k
 p11-kit-trust                   x86_64 0.18.5-2.el6              base     71 k
 shared-mime-info                x86_64 0.70-4.el6                base    209 k
 snappy                          x86_64 1.1.0-1.el6               base     39 k
Transaction Summary
Install       7 Package(s)
Upgrade     128 Package(s)
Total download size: 122 M
Is this ok [y/N]:  y
Downloading Packages:
(1/135): abrt-2.0.8-21.el6.centos.x86_64.rpm             | 208 kB     00:00     
(2/135): abrt-addon-ccpp-2.0.8-21.el6.centos.x86_64.rpm  | 116 kB     00:00     
(3/135): abrt-addon-kerneloops-2.0.8-21.el6.centos.x86_6 |  65 kB     00:00     
(4/135): abrt-addon-python-2.0.8-21.el6.centos.x86_64.rp |  65 kB     00:00     
(5/135): abrt-cli-2.0.8-21.el6.centos.x86_64.rpm         |  54 kB     00:00
  Updating   : openssh-clients-5.3p1-94.el6.x86_64                      107/263 
  Updating   : openssh-server-5.3p1-94.el6.x86_64                       108/263 
warning: /etc/ssh/sshd_config created as /etc/ssh/sshd_config.rpmnew
  Updating   : parted-2.1-21.el6.x86_64                                 109/263 
  Updating   : biosdevname-0.5.0-2.el6.x86_64                           110/263 
  Updating   : libdrm-2.4.45-2.el6.x86_64                               111/263 
  Verifying  : lvm2-2.02.98-9.el6_4.3.x86_64                            262/263 
  Verifying  : efibootmgr-0.5.4-10.el6.x86_64                           263/263 
  kernel.x86_64 0:2.6.32-431.el6                                                
Dependency Installed:
  lzo.x86_64 0:2.03-3.1.el6               make.x86_64 1:3.81-20.el6             
  p11-kit.x86_64 0:0.18.5-2.el6           p11-kit-trust.x86_64 0:0.18.5-2.el6   
  shared-mime-info.x86_64 0:0.70-4.el6    snappy.x86_64 0:1.1.0-1.el6           
  abrt.x86_64 0:2.0.8-21.el6.centos                                             
  abrt-addon-ccpp.x86_64 0:2.0.8-21.el6.centos                          
  systemtap-runtime.x86_64 0:2.3-3.el6                                          
  sysvinit-tools.x86_64 0:2.87-5.dsf.el6                                        
  udev.x86_64 0:147-2.51.el6                                                    
  util-linux-ng.x86_64 0:2.17.2-12.14.el6                                       
  xmlrpc-c.x86_64 0:1.16.24-1210.1840.el6                                       
  xmlrpc-c-client.x86_64 0:1.16.24-1210.1840.el6                                
  xorg-x11-drv-ati-firmware.noarch 0:7.1.0-3.el6                                

Reboot the Linux server using any one of the following method:
# reboot
# shutdown -r now
Sample outputs:

Broadcast message from [email protected]
	(/dev/pts/0) at 2:20 ...
The system is going down for reboot NOW!
[[email protected] vivek]# Connection to closed by remote host.
Connection to closed.

Verification: After rebooting the box

Verify that everything is working fine and you have been upgraded to the latest CentOS Linux v6.5 release with the following commands:
# uname -a
# cat /etc/redhat-release

Sample outputs:

Fig.01: CentOS Linux 6.5 Final

Verify open ports and make sure your apps are running without any problems with the following commands:
# netstat -tulpn
# tail -f /var/log/messages
# tail -f /path/to/log/files
# ps aux | less
# ps aux | egrep 'httpd|mysql'
# pgrep 'my_app'

See yum(8) command man page for more information.

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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