yum.conf文件解析

[main]
cachedir=/var/cache/yum          #yum下载的RPM包的缓存目录
keepcache=0                  #缓存是否保存,1保存,0不保存。
debuglevel=2                 #调试级别(0-10),默认为2(具体调试级别的应用,我也不了解)。
logfile=/var/log/yum.log       #yum的日志文件所在的位置
exactarch=1                 #在更新的时候,是否允许更新不同版本的RPM包,比如是否在i386上更新i686的RPM包。
obsoletes=1                 #这是一个update的参数,具体请参阅yum(8),简单的说就是相当于upgrade,允许更新陈旧的RPM包。
gpgcheck=1                 #是否检查GPG(GNU Private Guard),一种密钥方式签名。
plugins=1                 #是否允许使用插件,默认是0不允许,但是我们一般会用yum-fastestmirror这个插件。
installonly_limit=3          #允许保留多少个内核包。
exclude=selinux*           #屏蔽不想更新的RPM包,可用通配符,多个RPM包之间使用空格分离。
#       This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
# It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
metadata_expire=90m      #设定保存时长
# PUT YOUR REPOS HERE or IN separate files named file.repo
# in /etc/yum.repos.d

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