How to upgrade centos
1. Check the system version
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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.
Recommended tutorial: centos usage tutorial
3. Run the yum command to upgrade
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4. Restart the system
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5. Check the current system version
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Recommended related video tutorials: linux video tutorial
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