CentOS Linux 7.7 released and here is how to update it

The CentOS Linux project has released an updated version of its stable Linux distribution CentOS Linux 7.7. You must upgrade to get corrections for security problem as this version made a few adjustments for the severe issue found in CentOS 7.6. CentOS is a Linux distro that is mainly maintained and updated through the work of many users who volunteer their time and effort. It is based upon RHEL 7.7 upstream source code.

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More about CentOS Linux 7.7 released

From the release note:

We are pleased to announce the general availability of CentOS Linux 7 (1908) for the x86_64 architecture. Effectively immediately, this is the current release for CentOS Linux 7 and is tagged as 1908, derived from Red Hat Enterprise Linux 7.7 Source Code. Updates released since the upstream release are all posted, across all architectures. We strongly recommend every user apply all updates, including the content released today, on your existing CentOS Linux 7 machine. Many packages have received important updates. Please see the upstream document for details.

What’s new in CentOS 7.7

Major changes in CentOS 7.7:

  • Python 3 is now available. Installing the python3 package gives you the Python 3.6 interpreter.
  • bind version 9.11
  • chrony version 3.4
  • Since release 1503 (abrt>= 2.1.11-19.el7.centos.0.1) CentOS-7 can report bugs directly to bugs.centos.org.
  • Linux kernel version 3.10.0-1062.1.1.el7.x86_64
  • More info here

How to update to CentOS 7.6 from 7.7

First, note down the Linux kernel version, run:
uname -mrs
Check CentOS Linux version in Linux command line, run:
lsb_release -a
OR
hostnamectl
Find CentOS Linux version

Upgrading CentOS 7.6 to 7.7

Make sure you back up all your data, database, and configuration file before attempting upgrade procedure on CentOS Linux 7.6. You can see a list of the updates on screen, type:
sudo yum check-update
Sample outputs:

Loaded plugins: copr
 
GeoIP.x86_64                              1.5.0-14.el7                   base   
NetworkManager.x86_64                     1:1.18.0-5.el7_7.1             updates
NetworkManager-libnm.x86_64               1:1.18.0-5.el7_7.1             updates
NetworkManager-ppp.x86_64                 1:1.18.0-5.el7_7.1             updates
NetworkManager-team.x86_64                1:1.18.0-5.el7_7.1             updates
NetworkManager-tui.x86_64                 1:1.18.0-5.el7_7.1             updates
NetworkManager-wifi.x86_64                1:1.18.0-5.el7_7.1             updates
alsa-lib.x86_64                           1.1.8-1.el7                    base   
apr.x86_64                                1.4.8-5.el7                    base   
audit.x86_64                              2.8.5-4.el7                    base   
...
..
...
yum-cron.noarch                           3.4.3-163.el7.centos           base   
yum-plugin-copr.noarch                    1.1.31-52.el7                  base   
yum-plugin-fastestmirror.noarch           1.1.31-52.el7                  base   
yum-utils.noarch                          1.1.31-52.el7                  base   
Obsoleting Packages
python3.x86_64                            3.6.8-10.el7                   base   
    python36.x86_64                       3.6.8-1.el7                    @epel  
python3-libs.x86_64                       3.6.8-10.el7                   base   
    python36-libs.x86_64                  3.6.8-1.el7                    @epel  
python3-setuptools.noarch                 39.2.0-10.el7                  base   
    python36-setuptools.noarch            39.2.0-3.el7                   @epel

Next, simply run the following yum command:
sudo yum update
CentOS Linux 7.7 released and how to upgrade it using yum

Reboot the CentOS 7.6 Linux machine

Simply run any one of the following command:
sudo shutdown -r now
OR
sudo reboot

Verify upgrades from 7.6 to 7.7

Run the following commands to see version numbers:
uname -mrs
lsb_release -a

Make sure all services are running on CentOS Linux box:
ps aux
netstat -tulpn | grep LISTEN
top
htop

Verify CentOS Linux 7.6 to 7.7 upgrade
Check out for errors in log file using the cat command/grep command/egrep command and other tools:
tail -f /var/log/messages
grep error /path/to/nginx.conf
egrep -i 'err|warn|cri' /var/log/messages

Conclusion

Overall, CentOS Linux 7.7 provides new updates for popular operating systems. This page also explained how to update CentOS 7.6 to 7.7 using yum command. For more information see official wiki page here and known issues page here.

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