Offline Local Yum Repository Setup

1. Prepare ISO Storage and Mount Points

   mkdir -p /app/centos-iso-mount
   mkdir -p /data/iso-files
   

   Upload the CentOS-6.7-x86_64-bin-DVD1.iso file to /data/iso-files.

2. Mount the ISO Image

   mount -o loop /data/iso-files/CentOS-6.7-x86_64-bin-DVD1.iso /app/centos-iso-mount
   

3. Adjust Yum Repository Configuration Files Navigate to the yum configuration directory and disable network-based repos by renaming them:

   cd /etc/yum.repos.d/
   mv CentOS-Base.repo CentOS-Base.repo.offline
   mv CentOS-Vault.repo CentOS-Vault.repo.offline
   mv CentOS-Debuginfo.repo CentOS-Debuginfo.repo.offline
   

4. Create or Edit Local Media Repo Open CentOS-Local-Media.repo with a text editor and add the following content:

   [c6-local]
   name=CentOS-$releasever - Local ISO
   baseurl=file:///app/centos-iso-mount/
   gpgcheck=0
   enabled=1
   

5. Clear Yum Cache and Test Installation

   yum clean all
   yum install -y git
   

6. Enable Persistent ISO Mount on Boot Add the mount command to /etc/rc.d/rc.local:

   echo 'mount -o loop /data/iso-files/CentOS-6.7-x86_64-bin-DVD1.iso /app/centos-iso-mount' >> /etc/rc.d/rc.local
   chmod +x /etc/rc.d/rc.local
   

---

Online Vault-Based Yum Repository Setup

CentOS 6 reached end-of-life in November 2020, so standard public mirrors no longer serve updates. The Alibaba Cloud vault provides archvied packages. Follow these steps:

1. Disable Fastest Mirror Plugin

   sed -i 's|enabled=1|enabled=0|g' /etc/yum/pluginconf.d/fastestmirror.conf
   

2. Backup Existing Base Repo

   mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
   

3. Download and Apply Vault Repo File

   curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-6-vault.repo
   

4. Clear and Rebuild Yum Cache

   yum clean all
   yum makecache
   

Manual Vault Repo File Content

If the curl command fails, create /etc/yum.repos.d/CentOS-Base.repo manually with:

[base]
name=CentOS-6.10 - Base - Aliyun Vault
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/6.10/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

[updates]
name=CentOS-6.10 - Updates - Aliyun Vault
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/6.10/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

[extras]
name=CentOS-6.10 - Extras - Aliyun Vault
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/6.10/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

[centosplus]
name=CentOS-6.10 - Plus - Aliyun Vault
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/6.10/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

[contrib]
name=CentOS-6.10 - Contrib - Aliyun Vault
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/6.10/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6