yum update 和 upgrade在歐拉2.8中的區別

yum Update 和 upgrade在歐拉2.8中的區別

yum對這兩個的文檔說明

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在歐拉2.8中不同之處

yum update ? ? 升級所有包，會保留舊版本的 package，更新系統內核根據?obsoletes 配置而定

yum upgrade ? 升級所有包，會刪除舊版本的 package，更新系統內核

yum 的?upgrade 是等價于打開 obsoletes?配置的 yum update。

而默認中/etc/yum.conf配置文件obsoletes是打開的，因此這兩個指令針對系統內核來說是等價的

yum

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