How to Fix Common yum Errors on CentOS 7: Step‑by‑Step Guide

Introduction

This article explains how to troubleshoot frequent yum command failures on a CentOS 7 system, providing concrete commands and step‑by‑step procedures.

1. yum returns a 404 error

Check that the yum repository is correctly configured, for example by downloading the official repo file from Alibaba Cloud:

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

If the error mentions the $releasever variable, verify that the centos-release package is installed: rpm -qa | grep centos-release If it is missing, download and install it:

wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/centos-release-7-7.1908.0.el7.centos.x86_64.rpm
rpm -ivh centos-release-7-7.1908.0.el7.centos.x86_64.rpm

2. yum install reports a failed error

Example error when installing telnet:

ERROR UNpacking rpm package 1：telnet-0.17-64.e17.x86_64
error：unpacking of archive failed on file /usr/bin/telnet；5e785bc7：cpio：open

Check the attributes of the target directory; an immutable i flag can block writes: lsattr /usr/bin Remove the immutable flag:

chattr -i /usr/bin