Upgrading to CentOS 7.7


CentOS 7.7 has just been released a few days ago and with any luck CentOS 8 will be released next week. I decided to quickly upgrade one of my dedicated servers from CentOS 7.6 to CentOS 7.7.

Confirm CentOS Version

Just a couple of steps to check what CentOS release we’re running:

root@s2:~ # cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

There should also be a package reflecting CentOS release already installed on your system. This package will be upgraded along with the rest of the OS when we’re stepping up to CentOS 7.7:

root@s2:~ # rpm -qa | grep centos-release

Check Available CentOS Upgrades

yum command has the check-update option for verifying if any packages are available for updating:

root@s2:~ # yum check-update

This will return a rather long list. To be super-sure we’ll actually get the CentOS 7.7 upgrade, look for the same centos-release package:

root@s2:~ # yum check-update | grep centos-release
 centos-release.x86_64                    7-7.1908.0.el7.centos           base

Upgrade CentOS 7.6 to CentOS 7.7

We need the yum update command here. After you run it it will resolve dependencies and report something like this, prompting for your confirmation:

Transaction Summary
Install    3 Packages (+25 Dependent packages)
Upgrade  406 Packages
Total download size: 577 M
Is this ok [y/d/N]:

Sounds about right! We’ll press Y and let the server download and apply all the updates…

On my hosting it took about 1min to download all the packages!

Transaction Summary
Install    3 Packages (+25 Dependent packages)
Upgrade  406 Packages
Total download size: 577 M
Is this ok [y/d/N]:
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Updating   : libgcc-4.8.5-39.el7.x86_64                                                                                                       1/841
 Installing : urw-base35-fonts-common-20170801-10.el7.noarch                                                                                   2/841
 Updating   : 1:grub2-common-2.02-0.80.el7.centos.noarch                                                                                       3/841
 Updating   : centos-release-7-7.1908.0.el7.centos.x86_64                                                                                      4/841
 Updating   : langtable-0.0.31-4.el7.noarch                                                                                                    5/841
 Updating   : libreport-filesystem-2.1.11-43.el7.centos.x86_64                                                                                 6/841
yum-plugin-fastestmirror.noarch 0:1.1.31-52.el7                           yum-utils.noarch 0:1.1.31-52.el7
   urw-fonts.noarch 0:2.4-16.el7

It took less than 10 min to apply all the package updates, so the only things left are to capture current kernel version before and after the reboot:

root@s2:/ # uname -a
Linux s2 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Now let’s reboot:

root@s2:/ # shutdown -r now

… and confirm that we’re running newer Linux Kernel and sporting the CentOS 7.7 release now:

greys@s2:~ $ uname -a
Linux s2 3.10.0-1062.1.1.el7.x86_64 #1 SMP Fri Sep 13 22:55:44 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Hmmm. This does look a bit conservative! It’s 3.10 branch of Linux kernel whereby desktop releases are sporting Linux Kernel 5.x already.

Anyway, that’s server s2 upgraded to CentOS 7.7 successfully!

We’re certainly running the CentOS 7.7 release now:

greys@s2:~ $ cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)

See Also