The difference between Yum upgrade and Yum update under CentOS is nothing, don't mess with Ubuntu update!

Description: Production environment for software version and kernel version requirements very accurate, don't worry about anything. Yum Update Operation!!!!!!!!!

Yum update: Upgrade all packages while upgrading software and system cores

Yum Upgrade: Upgrade all packages only, without upgrading software and system cores

Test examples:

First, before the upgrade

System version: Centos5. 5  2.6. -194. El5

Second, yum upgrade upgrade, upgrade all packages only, do not upgrade software and system kernel

System version: Centos5. 7  2.6. -194. El5

Third, after theyum update upgrade, upgrade all packages and also upgrade the software and system kernel

System version: Centos5. 7  2.6. -238. El5

Reference:

Http://www.jb51.net/LINUXjishu/342419.html

The difference between Yum upgrade and Yum update under CentOS is nothing, don't mess with Ubuntu update!