centos7.2重新安装yum
问题
[root@zf-test-web01-4 ~]# yum install rng-tools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
There are no enabled repos.
Run "yum repolist all" to see the repos you have.
You can enable repos with yum-config-manager --enable
红色部分问题解决如下：
-bash-4.2# vi /etc/yum/pluginconf.d/fastestmirror.conf
[main]
enabled=0
verbose=0
always_print_best_host = true
socket_timeout=3
# Relative paths are relative to the cachedir (and so works for users as well
# as root).
hostfilepath=timedhosts.txt
maxhostfileage=10
maxthreads=15
#exclude=.gov, facebook
把enabled=1改为enabled=0
再次执行yum安装，仍报错
[root@zf-test-web01-4 ~]# yum install -y rng-tools
There are no enabled repos.
Run "yum repolist all" to see the repos you have.
You can enable repos with yum-config-manager --enable
也就是蓝色部分，解决办法：
1. 查看centos7.2系统本身所安装的那些yum 软件包
[root@zf-test-web01-4 ~]# rpm -qa|grep yum
yum-plugin-fastestmirror-1.1.31-34.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64
yum-3.4.3-132.el7.centos.0.1.noarch
[root@zf-test-web01-4 ~]#
2. 卸载这些软件包
[root@zf-test-web01-4 ~]# rpm -e yum-plugin-fastestmirror-1.1.31-34.el7.noarch --nodeps
warning: /etc/yum/pluginconf.d/fastestmirror.conf saved as /etc/yum/pluginconf.d/fastestmirror.conf.rpmsave
[root@zf-test-web01-4 ~]# rpm -e yum-metadata-parser-1.1.4-10.el7.x86_64 --nodeps
[root@zf-test-web01-4 ~]# rpm -e yum-3.4.3-132.el7.centos.0.1.noarch --nodeps
[root@zf-test-web01-4 ~]#
3. 进入centos镜像网站找到自己对应系统需要的yum包
查看系统的命令：
[root@zf-test-web01-4 ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
查看系统的位数：
[root@zf-test-web01-4 ~]# file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=aa7ff68f13de25936a098016243ce57c3c982e06, stripped
http://vault.centos.org/
4. 下载这些yum包
wget http://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm
wget http://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-3.4.3-132.el7.centos.0.1.noarch.rpm
5. 安装下载的这些yum包
[root@zf-test-web01-4 ~]# rpm -ivh yum-*
Preparing... ################################# [100%]
Updating / installing...
1:yum-metadata-parser-1.1.4-10.el7 ################################# [ 33%]
2:yum-plugin-fastestmirror-1.1.31-3################################# [ 67%]
3:yum-3.4.3-132.el7.centos.0.1 ################################# [100%]
[root@zf-test-web01-4 ~]#
6. 更新centos系统的repo文件
http://mirrors.163.com/.help/centos.html
1）首先备份/etc/yum.repos.d/CentOS-Base.repo
[root@zf-test-web01-4 yum.repos.d]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2）下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)
3）运行以下命令生成缓存
[root@zf-test-web01-4 yum.repos.d]# yum clean all
Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Cleaning repos: base extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
[root@zf-test-web01-4 yum.repos.d]# yum makecache
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/12): base/7/x86_64/group_gz | 156 kB 00:00:00
(2/12): base/7/x86_64/filelists_db | 6.7 MB 00:00:01
(3/12): extras/7/x86_64/prestodelta | 71 kB 00:00:00
(4/12): extras/7/x86_64/primary_db | 145 kB 00:00:00
(5/12): extras/7/x86_64/filelists_db | 528 kB 00:00:00
(6/12): extras/7/x86_64/other_db | 97 kB 00:00:00
(7/12): updates/7/x86_64/prestodelta | 589 kB 00:00:00
(8/12): base/7/x86_64/primary_db | 5.7 MB 00:00:01
(9/12): base/7/x86_64/other_db | 2.5 MB 00:00:00
(10/12): updates/7/x86_64/primary_db | 4.5 MB 00:00:00
(11/12): updates/7/x86_64/other_db | 490 kB 00:00:00
(12/12): updates/7/x86_64/filelists_db | 2.7 MB 00:00:01
Determining fastest mirrors
Metadata Cache Created
7. 重新运用yum安装软件