下载在线源：######### 无法匹配系统

    1. curl -OL http://mirrors.163.com/.help/CentOS7-Base-163.repo

    手动添加yum源

    1. [root@dns-server yum.repos.d]# cat /tmp/CentOS-Base.repo 
    2. #CentOS-Base.repo
    4. #
    6. # The mirror system uses the connecting IP address of the client and the
    8. # update status of each mirror to pick mirrors that are updated to and
    10. # geographically close to the client.  You should use this for CentOS updates
    12. # unless you are manually picking other mirrors.
    14. #
    16. # If the mirrorlist= does not work for you, as a fall back you can try the
    18. # remarked out baseurl= line instead.
    20. #
    22. #
    24. [base]
    26. name=CentOS-$7 - Base - 163.com
    28. #mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=os
    30. baseurl=http://mirrors.163.com/centos/7/os/$basearch/
    32. gpgcheck=1
    34. gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    38. #released updates
    40. [updates]
    42. name=CentOS-$7 - Updates - 163.com
    44. #mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updates
    46. baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
    48. gpgcheck=1
    50. gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    54. #additional packages that may be useful
    56. [extras]
    58. name=CentOS-$7 - Extras - 163.com
    60. #mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extras
    62. baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
    64. gpgcheck=1
    66. gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    70. #additional packages that extend functionality of existing packages
    72. [centosplus]
    74. name=CentOS-$7 - Plus - 163.com
    76. baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
    78. gpgcheck=1
    80. enabled=0
    82. gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
    83. [root@dns-server yum.repos.d]#
    1. yum clean all
    2. yum makecache

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    卸载Redhat的yum包

    1. rpm -qa|grep yum|xargs rpm -e --nodeps

    rpm -qa|grep yum

    cd /tmp

    1. wget http://mirrors.163.com/centos/7.6.1810/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
    2. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-167.el7.centos.noarch.rpm
    3. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
    4. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-53.el7.noarch.rpm
    5. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-53.el7.noarch.rpm
    6. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-53.el7.noarch.rpm
    7. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
    8. wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-chardet-2.2.1-3.el7.noarch.rpm

    安装依赖

    1. ###依赖包
    2. rpm -ivh python-chardet-2.2.1-3.el7.noarch.rpm
    3. rpm -ivh python-kitchen-1.1.1-5.el7.noarch.rpm
    5. 安装CentOS7 yun包
    6. ####
    7. rpm -ivh yum-utils-1.1.31-53.el7.noarch.rpm
    8. rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm 
    9. rpm -ivh yum-plugin-fastestmirror-1.1.31-53.el7.noarch.rpm
    10. rpm -ivh yum-updateonboot-1.1.31-53.el7.noarch.rpm
    11. rpm -ivh yum-3.4.3-167.el7.centos.noarch.rpm

    下载链接无效
    访问 http://mirrors.163.com/centos 更新地址
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