How to upgrade centos to the latest version

The "update" command in centos can update all software to the latest version at one time.

Note: It is not recommended to use the y option of update. The -y option will allow you to confirm before installing each update (Translator's Note: This will be very time-consuming and the update progress is busy);

Recommended tutorial: centos tutorial

For centos 5.X and 6.X systems, we need to reinstall the application to restore data after updating. Fortunately, centos7 does not need to do this. No problem, you can upgrade directly. For safety reasons, if you have important data, it is recommended to make a backup before upgrading the system.

The following are the steps to upgrade centos 7.X

1. Check the system version

$ cat /etc/redhat-release

CentOS Linux release 7.1 .1503 (Core)

2. Back up important data (such as /etc, /var,/opt). If centos is installed on a virtual machine, you can use snapshots for backup. For example, VMware virtual machines can be backed up by snapshots. Of course, the more luxurious thing is to back up the entire virtual machine. It can also back up important program data, such as MySQL, Appache, Nginx, DNS, etc.

3. Run the yum command to upgrade

$ sudo yum clean all

$ sudo yum update

4. Restart the system

$ sudo reboot

5. Check the current system version

$ cat /etc/redhat-release

CentOS Linux release 7.3.1611 (Core)

Related Video tutorial recommendation: linux video tutorial

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