红帽 redhat 更改yum源为本地光盘（cdrom）

学习Linux安装tree命令，发现红帽默认无法使用yum。查询资料了解到修改yum源的方法如下：

在/mnt目录下增加一个cdrom目录进行挂载；
编辑/etc/yum.repos.d 下的repo文件。
具体步骤如下：

默认安装yum报错，如下

[root@localhost ~]# yum install treeLoaded plugins: langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.There are no enabled repos. Run "yum repolist all" to see the repos you have. To enable Red Hat Subscription Management repositories:     subscription-manager repos --enable <repo> To enable custom repositories:     yum-config-manager --enable <repo>

创建一个挂载点。

[root@localhost ~]# mkdir /mnt/cdrom[root@localhost ~]# mount /dev/cdrom /mnt/cdrom/[root@localhost ~]# ll /mnt/cdrom/total 962dr-xr-xr-x. 4 root root   2048 Oct 10  2018 addonsdr-xr-xr-x. 3 root root   2048 Oct 10  2018 EFI-r--r--r--. 1 root root   8266 Apr  4  2014 EULA-r--r--r--. 1 root root   1455 Oct 10  2018 extra_files.json-r--r--r--. 1 root root  18092 Mar  6  2012 GPLdr-xr-xr-x. 3 root root   2048 Oct 10  2018 imagesdr-xr-xr-x. 2 root root   2048 Oct 10  2018 isolinuxdr-xr-xr-x. 2 root root   2048 Oct 10  2018 LiveOS-r--r--r--. 1 root root    114 Oct 10  2018 media.repodr-xr-xr-x. 2 root root 931840 Oct 10  2018 Packagesdr-xr-xr-x. 2 root root   4096 Oct 10  2018 repodata-r--r--r--. 1 root root   3375 Sep 21  2018 RPM-GPG-KEY-redhat-beta-r--r--r--. 1 root root   3211 Sep 21  2018 RPM-GPG-KEY-redhat-release-r--r--r--. 1 root root   1796 Oct 10  2018 TRANS.TBL

3.进入repos目录，创建repo文件，增加cdrom源，“RPM-GPG-KEY-redhat-release”该名称从cdrom目录中查找。

[root@localhost ~]# cd /etc/yum.repos.d/    [root@localhost yum.repos.d]# ls    redhat.repo    [root@localhost yum.repos.d]# mv redhat.repo redhat.repo.bak    [root@localhost yum.repos.d]# vi iso.repo    [root@localhost yum.repos.d]# cat iso.repo    [base]    name=centos    baseurl=file:///mnt/cdrom    enable=1    gpgcheck=0    gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release

4.清理yum：yum clean all
5.安装tree命令

    [root@localhost yum.repos.d]# yum -y install treeLoaded plugins: langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.base                                                              | 4.3 kB  00:00:00(1/2): base/group_gz                                              | 146 kB  00:00:00(2/2): base/primary_db                                            | 4.2 MB  00:00:00Resolving Dependencies--> Running transaction check---> Package tree.x86_64 0:1.6.0-10.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved========================================================================================= Package           Arch                Version                   Repository         Size=========================================================================================Installing: tree              x86_64              1.6.0-10.el7              base               46 kTransaction Summary=========================================================================================Install  1 PackageTotal download size: 46 kInstalled size: 87 kDownloading packages:Running transaction checkRunning transaction testTransaction test succeededRunning transaction  Installing : tree-1.6.0-10.el7.x86_64                                              1/1base/productid                                                    | 1.6 kB  00:00:00  Verifying  : tree-1.6.0-10.el7.x86_64                                              1/1Installed:  tree.x86_64 0:1.6.0-10.el7Complete!

6.至此修改yum源为本地完成。

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