redhat怎么配置yum_yum卸载软件包的命令

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/sec-configuring_yum_and_yum_repositories

A sample /etc/yum.conf configuration file can look like this:![在这里插入图片
The following is a sample /etc/yum.repos.d/redhat.repo file:

enabled = 1 — Include this repository as a package source.
gpgcheck and sslverify – 1 is true, 0 is false
$releasever
You can use this variable to reference the release version of Red Hat Enterprise Linux. Yum obtains the value of $releasever from the distroverpkg=value line in the /etc/yum.conf configuration file. If there is no such line in /etc/yum.conf, then yum infers the correct value by deriving the version number from the redhat-releaseproduct package that provides the redhat-release file.

$basearch
You can use $basearch to reference the base architecture of the system. For example, i686 and i586 machines both have a base architecture of i386, and AMD64 and Intel 64 machines have a base architecture of x86_64.

issue 1，SSL certificate不通过
gpgkey和sslverify可以关掉再去执行。

issue 2，URL返回404
Check URL中的两个参数是否有效，将两个参数替换成有效的值（从其他可用yum的server获取）
假如$releasever没有在/etc/yum.conf中定义，运行yum version nogroups 获取

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