yum配置文件详解

cat /etc/yum.conf

[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。
logfile=/var/log/yum.log # yum的日志文件所在的位置
exactarch=1 # 更新时，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 # 相当于upgrade，允许更新陈旧的RPM包，具体请参阅yum(8)。
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。
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

PUT YOUR REPOS HERE or IN separate files named file.repo

in /etc/yum.repos.d