CentOS的yum源被误删解决方法

Chapter1: yum源误删

Question Description:

1 2	(base) [root@automlgpu4 bin]# yum -bash: /usr/bin/yum: No such file or directory

Solution

# step1: 查看centos版本信息
$ rpm -q centos-release
[output]: centos-release-7-9.2009.1.el7.centos.x86_64

# step2 找到对应的源信息，链接如下：
http://mirrors.163.com/

# step3:执行下面命令
rpm -ivh --nodeps http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh --nodeps http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
rpm -ivh --nodeps http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm

# step4
cd /etc/yum.repo.d/
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
yum repolist
yum clean all
yum makecache

Chapter2: abrt-cli: error while loading shared libraries: libstdc++.so.6: wrong ELF class: ELFCLASS32

问题分析：
- 由于libstdc++.so.6的版本不对（写者这是6.0.19 改为6.0.17解决问题）
解决方案：
- 只需把libstdc++.so.6.0.17复制到 /usr/lib64 然后建立连接即可
- 下载链接: libstdc++.so.6.0.17

# 放到对应目录下面
mv ./libstdc++.so.6.0.17 /usr/lib64/

# 删除以前的libstdc++.so.6
cd /usr/lib64
rm libstdc++.so.6

# 建立新的链接
ln -s /usr/lib64/libstdc++.so.6.0.17 /usr/lib64/libstdc++.so.6

# 验证
ll | grep libstdc
# lrwxrwxrwx  1 root root  30 Jul  2 16:07 libstdc++.so.6 -> /usr/lib64/libstdc++.so.6.0.17

# 重新加载环境变量
source /etc/profile