CentOS has released its major release of CentOS 6.6 on 28th October 2014, 14 days after RHEL 6.6. Since from the day of release every one is looking for upgrading the current version to latest CentOS release. This how to is mainly focusing on upgrading previous release of CentOS 6.x to the latest. Before going to update, lets look into the main features in the latest version.
Major changes:
- Red Hat Enterprise Linux 6.6 includes the Open vSwitch kernel module,
- KeepAlived and HAProxy packages are now fully supported,
- Added functionality of System Security Services Daemon (SSSD) enables better interoperability of Red Hat Enterprise Linux clients with Active Directory,
- Performance Co-Pilot (PCP) provides a framework and services to support system-level performance monitoring and management,
- New hyperv-daemons packages have been added to Red Hat Enterprise Linux 6.6.
See Red Hat 6.6 Release Notes and Red Hat 6.6 Technical Notes.
Check the current version of your release.
# cat /etc/redhat-release
CentOS release 6.5 (Final)
Now lets look what are the updates available for your system.
# yum check-update
The following are the list of available updates for my machine.
udev.x86_64 147-2.57.el6 base
upstart.x86_64 0.6.5-13.el6_5.3 base
util-linux-ng.x86_64 2.17.2-12.18.el6 base
xz.x86_64 4.999.9-0.5.beta.20091007git.el6 base
xz-libs.x86_64 4.999.9-0.5.beta.20091007git.el6 base
xz-lzma-compat.x86_64 4.999.9-0.5.beta.20091007git.el6 base
yum.noarch 3.2.29-60.el6.centos base
yum-plugin-fastestmirror.noarch 1.1.30-30.el6 base
If you are satisfied with the updates, lets issue the following command to install the same.
# yum update
You will get the following information with download size, you need to confirm the installation by pressing Y and Enter.
system-config-firewall-tui noarch 1.2.27-7.1.el6 base 39 k
tzdata noarch 2014j-1.el6 updates 445 k
udev x86_64 147-2.57.el6 base 349 k
upstart x86_64 0.6.5-13.el6_5.3 base 177 k
util-linux-ng x86_64 2.17.2-12.18.el6 base 1.6 M
xz x86_64 4.999.9-0.5.beta.20091007git.el6 base 137 k
xz-libs x86_64 4.999.9-0.5.beta.20091007git.el6 base 89 k
xz-lzma-compat x86_64 4.999.9-0.5.beta.20091007git.el6 base 16 k
yum noarch 3.2.29-60.el6.centos base 1.0 M
yum-plugin-fastestmirror noarch 1.1.30-30.el6 base 31 k
Transaction Summary
========================================================================================================================================================================
Install 1 Package(s)
Upgrade 99 Package(s)
Total download size: 109 M
Is this ok [y/N]: y
Downloading Packages:
(1/10): curl-7.19.7-37.el6_4_7.19.7-40.el6_6.1.x86_64.drpm | 99 kB 00:00
(2/10): cyrus-sasl-2.1.23-13.el6_3.1_2.1.23-15.el6_6.1.x86_64.drpm | 66 kB 00:00
(3/10): cyrus-sasl-lib-2.1.23-13.el6_3.1_2.1.23-15.el6_6.1.x86_64.drpm | 34 kB 00:00
(4/10): iproute-2.6.32-31.el6_2.6.32-33.el6_6.x86_64.drpm | 269 kB 00:00
(5/10): libcurl-7.19.7-37.el6_4_7.19.7-40.el6_6.1.x86_64.drpm | 54 kB 00:00
(6/10): libxml2-2.7.6-14.el6_2.7.6-17.el6_6.1.x86_64.drpm | 75 kB 00:00
(7/10): nss-softokn-3.14.3-9.el6_3.14.3-18.el6_6.x86_64.drpm | 76 kB 00:00
(8/10): nss-softokn-freebl-3.14.3-9.el6_3.14.3-18.el6_6.x86_64.drpm | 38 kB 00:00
(9/10): openssh-5.3p1-94.el6_5.3p1-104.el6_6.1.x86_64.drpm | 216 kB 00:00
(10/10): rsyslog-5.8.10-8.el6_5.8.10-9.el6_6.x86_64.drpm | 120 kB 00:00
Once downloaded, it will automatically start installing it, accept the GPG signing key, if it prompts.
(85/90): util-linux-ng-2.17.2-12.18.el6.x86_64.rpm | 1.6 MB 00:00
(86/90): xz-4.999.9-0.5.beta.20091007git.el6.x86_64.rpm | 137 kB 00:00
(87/90): xz-libs-4.999.9-0.5.beta.20091007git.el6.x86_64.rpm | 89 kB 00:00
(88/90): xz-lzma-compat-4.999.9-0.5.beta.20091007git.el6.x86_64.rpm | 16 kB 00:00
(89/90): yum-3.2.29-60.el6.centos.noarch.rpm | 1.0 MB 00:00
(90/90): yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm | 31 kB 00:00
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 4.1 MB/s | 106 MB 00:26
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Importing GPG key 0xC105B9DE:
Userid : CentOS-6 Key (CentOS 6 Official Signing Key) <[email protected]>
Package: centos-release-6-5.el6.centos.11.1.x86_64 (@CentOS6-Base/$releasever)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : libgcc-4.4.7-11.el6.x86_64 1/199
Updating : centos-release-6-6.el6.centos.12.2.x86_64 2/199
Updating : tzdata-2014j-1.el6.noarch 3/199
Updating : nss-softokn-freebl-3.14.3-18.el6_6.x86_64 4/199
Updating : glibc-2.12-1.149.el6.x86_64 5/199
Once completed, reboot the machine
# reboot
You can verify CentOS version.
# cat /etc/redhat-release
CentOS release 6.6 (Final)
That’s All!, now you have the latest version of CentOS.
