yum update 和 upgrade在欧拉2.8中的区别

yum Update 和 upgrade在欧拉2.8中的区别

yum对这两个的文档说明

yum update:If run without any packages, update will update every currently installed package.  If one or more packages or package globs are specified, Yum will only update the  listed

packages.  While updating packages, yum will ensure that all dependencies are satisfied. (See Specifying package names for more information) If the packages or globs speci-fied match to packages which are not currently installed then update will not install them. update operates on groups, files, provides and filelists just like the "install"command.

If  the  main  obsoletes configure option is true (default) or the --obsoletes flag is present yum will include package obsoletes in its calculations - this makes it betterfor distro-version changes, for example: upgrading from somelinux 8.0 to somelinux 9.

Note that "update" works on installed packages first, and only if there are no matches does it look for available packages. The difference is most noticeable  when  you  do"update foo-1-2" which will act exactly as "update foo" if foo-1-2 is installed. You can use the "update-to" if you’d prefer that nothing happen in the above case

yum upgrade:Is the same as the update command with the — obsoletes flag set. See update for more details.

yum update 和 upgrade在欧拉2.8中不同之处

yum update     升级所有包，会保留旧版本的 package，更新系统内核根据 obsoletes 配置而定

yum upgrade   升级所有包，会删除旧版本的 package，更新系统内核

yum 的 upgrade 是等价于打开 obsoletes 配置的 yum update。

而默认中/etc/yum.conf配置文件obsoletes是打开的，因此这两个指令针对系统内核来说是等价的

yum

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