분명히 존재하는 패키지인데 설치가 되지 않는 경우가 있습니다.
이는, /etc/yum.repos.d에 저장된 centos-base.repo 파일에 문제가 있을 경우가 큽니다.
아래 내용은 CentOS 버전 별 CentOS-Base.repo 파일의 기본 설정 내용입니다. 임의로 수정 후 다시 복구할 때 사용할 수 있습니다.
#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.
[BaseOS]
name=CentOS-releasever&arch=basearch&repo=BaseOS&infra=infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
#CentOS-Base.repo
#The mirror system uses the connecting IP address of the client and the
#update status of each mirror to pick mirrors that are updated to and
#geographically close to the client. You should use this for CentOS updates
#unless you are manually picking other mirrors.
#If the mirrorlist= does not work for you, as a fall back you can try the
#remarked out baseurl= line instead.
[base]
name=CentOS-releasever&arch=basearch&repo=os&infra=infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-releasever&arch=basearch&repo=updates&infra=infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-releasever&arch=basearch&repo=extras&infra=infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-releasever&arch=basearch&repo=centosplus&infra=infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#CentOS-Base.repo
#The mirror system uses the connecting IP address of the client and the
#update status of each mirror to pick mirrors that are updated to and
#geographically close to the client. You should use this for CentOS updates
#unless you are manually picking other mirrors.
#If the mirrorlist= does not work for you, as a fall back you can try the
#remarked out baseurl= line instead.
[base]
name=CentOS-releasever&arch=basearch&repo=os #baseurl=http://mirror.centos.org/centos/releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-releasever&arch=basearch&repo=updates #baseurl=http://mirror.centos.org/centos/releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-releasever&arch=basearch&repo=extras #baseurl=http://mirror.centos.org/centos/releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-releasever&arch=basearch&repo=centosplus #baseurl=http://mirror.centos.org/centos/releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-releasever&arch=basearch&repo=contrib #baseurl=http://mirror.centos.org/centos/releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#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&arch=basearch&repo=os #baseurl=http://mirror.centos.org/centos/releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
exclude=kernel*
#released updates
[updates]
name=CentOS-releasever&arch=basearch&repo=updates #baseurl=http://mirror.centos.org/centos/releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
exclude=kernel*
#packages used/produced in the build but not released
[addons]
name=CentOS-releasever&arch=basearch&repo=addons #baseurl=http://mirror.centos.org/centos/releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-releasever&arch=basearch&repo=extras #baseurl=http://mirror.centos.org/centos/releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-releasever&arch=basearch&repo=centosplus #baseurl=http://mirror.centos.org/centos/releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5