1、备份原有yum文件

mkdir -p /etc/yum.repos.d/repo_backup
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/repo_backup

2、在/etc/yum.repos.d下新建CentOS-Base.repo，把下面内容粘贴到CentOS-Base.repo里面

首先centos6

[base]
name=CentOS-6.6 - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.6/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6[updates]
name=CentOS-6.6 - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.6/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6[extras]
name=CentOS-6.6 - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.6/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6[centosplus]
name=CentOS-6.6 - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.6/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6[contrib]
name=CentOS-6.6 - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.6/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

centos7

# CentOS Vault contains rpms from older releases in the CentOS-7
# tree.
# C7.1.1503
[C7.1.1503-base]
name=CentOS-7.1.1503 - Base
baseurl=http://vault.centos.org/altarch/7.1.1503/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.1.1503-updates]
name=CentOS-7.1.1503 - Updates
baseurl=http://vault.centos.org/altarch/7.1.1503/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.1.1503-extras]
name=CentOS-7.1.1503 - Extras
baseurl=http://vault.centos.org/altarch/7.1.1503/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.1.1503-centosplus]
name=CentOS-7.1.1503 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.1.1503/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.1.1503-fasttrack]
name=CentOS-7.1.1503 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.1.1503/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.2.1511
[C7.2.1511-base]
name=CentOS-7.2.1511 - Base
baseurl=http://vault.centos.org/altarch/7.2.1511/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1511-updates]
name=CentOS-7.2.1511 - Updates
baseurl=http://vault.centos.org/altarch/7.2.1511/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1511-extras]
name=CentOS-7.2.1511 - Extras
baseurl=http://vault.centos.org/altarch/7.2.1511/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1511-centosplus]
name=CentOS-7.2.1511 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.2.1511/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1511-fasttrack]
name=CentOS-7.2.1511 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.2.1511/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.2.1603
[C7.2.1603-base]
name=CentOS-7.2.1603 - Base
baseurl=http://vault.centos.org/altarch/7.2.1603/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1603-updates]
name=CentOS-7.2.1603 - Updates
baseurl=http://vault.centos.org/altarch/7.2.1603/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1603-extras]
name=CentOS-7.2.1603 - Extras
baseurl=http://vault.centos.org/altarch/7.2.1603/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1603-centosplus]
name=CentOS-7.2.1603 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.2.1603/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.2.1603-fasttrack]
name=CentOS-7.2.1603 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.2.1603/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.3.1611
[C7.3.1611-base]
name=CentOS-7.3.1611 - Base
baseurl=http://vault.centos.org/altarch/7.3.1611/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.3.1611-updates]
name=CentOS-7.3.1611 - Updates
baseurl=http://vault.centos.org/altarch/7.3.1611/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.3.1611-extras]
name=CentOS-7.3.1611 - Extras
baseurl=http://vault.centos.org/altarch/7.3.1611/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.3.1611-centosplus]
name=CentOS-7.3.1611 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.3.1611/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.3.1611-fasttrack]
name=CentOS-7.3.1611 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.3.1611/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.4.1708
[C7.4.1708-base]
name=CentOS-7.4.1708 - Base
baseurl=http://vault.centos.org/altarch/7.4.1708/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.4.1708-updates]
name=CentOS-7.4.1708 - Updates
baseurl=http://vault.centos.org/altarch/7.4.1708/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.4.1708-extras]
name=CentOS-7.4.1708 - Extras
baseurl=http://vault.centos.org/altarch/7.4.1708/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.4.1708-centosplus]
name=CentOS-7.4.1708 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.4.1708/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.4.1708-fasttrack]
name=CentOS-7.4.1708 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.4.1708/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.5.1804
[C7.5.1804-base]
name=CentOS-7.5.1804 - Base
baseurl=http://vault.centos.org/altarch/7.5.1804/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.5.1804-updates]
name=CentOS-7.5.1804 - Updates
baseurl=http://vault.centos.org/altarch/7.5.1804/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.5.1804-extras]
name=CentOS-7.5.1804 - Extras
baseurl=http://vault.centos.org/altarch/7.5.1804/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.5.1804-centosplus]
name=CentOS-7.5.1804 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.5.1804/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.5.1804-fasttrack]
name=CentOS-7.5.1804 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.5.1804/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.6.1810
[C7.6.1810-base]
name=CentOS-7.6.1810 - Base
baseurl=http://vault.centos.org/altarch/7.6.1810/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.6.1810-updates]
name=CentOS-7.6.1810 - Updates
baseurl=http://vault.centos.org/altarch/7.6.1810/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.6.1810-extras]
name=CentOS-7.6.1810 - Extras
baseurl=http://vault.centos.org/altarch/7.6.1810/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.6.1810-centosplus]
name=CentOS-7.6.1810 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.6.1810/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.6.1810-fasttrack]
name=CentOS-7.6.1810 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.6.1810/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
# C7.7.1908
[C7.7.1908-base]
name=CentOS-7.7.1908 - Base
baseurl=http://vault.centos.org/altarch/7.7.1908/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.7.1908-updates]
name=CentOS-7.7.1908 - Updates
baseurl=http://vault.centos.org/altarch/7.7.1908/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.7.1908-extras]
name=CentOS-7.7.1908 - Extras
baseurl=http://vault.centos.org/altarch/7.7.1908/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.7.1908-centosplus]
name=CentOS-7.7.1908 - CentOSPlus
baseurl=http://vault.centos.org/altarch/7.7.1908/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0
[C7.7.1908-fasttrack]
name=CentOS-7.7.1908 - Fasttrack
baseurl=http://vault.centos.org/altarch/7.7.1908/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-$basearch
enabled=0

3、更新yum源信息

yum clean all
yum makecache

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