CDH添加节点时，报错Couldn't open file /media/cdrom/repodata/repomd.xml

问题遇到的现象和发生背景

我在往一个正常运行的CDH集群时，发生错误：

问题相关代码，请勿粘贴截图

异常信息：
yum-config-manager --save --setopt=rhel7.skip_if_unavailable=true

failure: repodata/repomd.xml from rhel7: [Errno 256] No more mirrors to try.
file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml"
END (1)
remote package oracle-j2sdk1.8 could not be installed, giving up
waiting for rollback request

运行结果及报错内容

异常信息：
yum-config-manager --save --setopt=rhel7.skip_if_unavailable=true

failure: repodata/repomd.xml from rhel7: [Errno 256] No more mirrors to try.
file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml"
END (1)
remote package oracle-j2sdk1.8 could not be installed, giving up
waiting for rollback request

我的解答思路和尝试过的方法

我人工检测到在安装过程当中 repomd.xml所在的位置 是
/var/cache/yum/x86_64/7Server/cloudera-manager/repomd.xml
/var/cache/yum/x86_64/7Server/elrepo/repomd.xml
/var/cache/yum/x86_64/7Server/epel/repomd.xml
疑惑：
但是安装程序为什么要去/media/cdrom/repodata/这个目录下录找repomd.xml文件呢

/media/cdrom/目录明明是LINUX 光驱所有在映射，我是CDH 新增节点，这与光驱有什么关系呢？实在不明白

我想要达到的结果

谁能帮我解决这个问题。

镜像源不可用，可以考虑换个镜像源试试。报错信息的意思是：远程镜像源找不到相应的文件，然后去默认的本地路径去寻找，如果你本地用的话，修改一下默认的本地路径就可以了。

是不是没有挂载镜像？

img

你把你的yun源配置文件换一下试试。

  1. 先卸载本机系统的yum源（我的是Centos7.8）

    rpm -aq|grep yum

    rpm -e 搜出来的yum源 --nodeps ( --nodeps作用是过滤删除时的详情)

  2. 根据自己系统版本找到centos官方镜像站相对应的yum源

    查看本机centos版本

    cat /etc/centos-release

    查看系统位数

    file /bin/ls

    centos官方镜像站：

    http://mirrors.ustc.edu.cn/help/centos.html

    修改yum配置文件，注意：请先备份/etc/yum.repos.d/CentOS-Base.repo这个文件, 对于 CentOS 6、7，使用以下命令替换默认配置

    1. mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
      ` 2. sudo sed -e 's|^mirrorlist=|#mirrorlist=|g' \

    -e 's|^#baseurl=http://mirror.centos.org/centos|baseurl=https://mirrors.ustc.edu.cn/centos|g'
    -i.bak
    /etc/yum.repos.d/CentOS-Base.repo
    `

 `


 # Centos7 修改 vi /etc/yum.repos.d/CentOS-Base.repo 文件,代码如下：
`
     # CentOS-Base.repo

     # The mirror system uses the connecting IP address of the client and the
     # update status of each mirror to pick mirrors that are updated to and
     # geographically close to the client.  You should use this for CentOS updates
     # unless you are manually picking other mirrors.
     #
     # If the mirrorlist= does not work for you, as a fall back you can try the
     # remarked out baseurl= line instead.


    [base]
    name=CentOS-$releasever - Base
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
    baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/os/$basearch/
    gpgcheck=1
    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

    #released updates
    [updates]
    name=CentOS-$releasever - Updates
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
    baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/updates/$basearch/
    gpgcheck=1
    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

    #additional packages that may be useful
    [extras]
    name=CentOS-$releasever - Extras
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
    baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/extras/$basearch/
    gpgcheck=1
    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

    #additional packages that extend functionality of existing packages
    [centosplus]
    name=CentOS-$releasever - Plus
    #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
    baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
    gpgcheck=1
    enabled=0
    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7


 # 这是centos官方镜像站yum的依赖， 选择自己的版本，我是把yum开头的全下了
 https://mirrors.ustc.edu.cn/centos/7.8.2003/os/x86_64/Packages/

 wget https://mirrors.ustc.edu.cn/centos/7.8.2003/os/x86_64/Packages/yum-NetworkManager-dispatcher-1.1.31-53.el7.noarch.rpm
 wget https://mirrors.ustc.edu.cn/centos/7.8.2003/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
 wget https://mirrors.ustc.edu.cn/centos/7.8.2003/os/x86_64/Packages/yum-cron-3.4.3-167.el7.centos.noarch.rpm

# 安装yum依赖包：
rpm -ivh |grep yum-**
  1. 先清除yum缓存，然后再进行更新缓存
    yum clean all
    yum makecache

试着yum下载看看，如果还不行，可以：

yum  clean all 
yum  clean metadata
yum  update

集群配置有问题

oracle-j2sdk1.8这个需要安装

先配置好机器上的YUM源，如果本地光盘源没有用，你可以先mv一下或者直接删除。
看你报错，去找了本地源。

源配置不对，找不到源

https://blog.csdn.net/qq_44730311/article/details/105187002?spm=1005.2026.3001.5635&utm_medium=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~Rate-4.pc_feed_download_top3ask&depth_1-utm_source=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~Rate-4.pc_feed_download_top3ask