How To Configure DNF And YUM To Cache Downloaded RPM Packages

DNF and YUM automatically download RPM packages and their dependencies during installation. If you need to build offline installation media, create local mirrors, or avoid repeated downloads across multiple systems, you’ll want to preserve those packages instead of letting them disappear from cache after installation.

This is especially useful for:

Building offline installation repositories
Preparing packages for air-gapped environments
Creating custom installation media
Pre-staging updates across multiple machines without re-downloading

Method 1: Download Packages Without Installing

The most straightforward approach is to download packages and their dependencies without performing any transaction:

dnf install --downloadonly --downloaddir=/var/cache/rpms/ package-name

For multiple packages:

dnf install --downloadonly --downloaddir=/var/cache/rpms/ package1 package2 package3

DNF will resolve all dependencies, download them, and exit without installing anything. The --downloaddir option specifies where to store the RPMs. Without this flag, packages are downloaded to DNF’s default cache directory (/var/cache/dnf/), which may be cleaned automatically.

Installing Downloaded Packages

Once you have the packages cached, install them locally:

dnf install /var/cache/rpms/*.rpm

Or install a specific package:

dnf install /var/cache/rpms/package-name-*.rpm

Handling Repository Metadata

When working with cached packages, you may need to create repository metadata if distributing them elsewhere. Use createrepo:

createrepo /var/cache/rpms/

This generates the necessary metadata files (repomd.xml, primary.xml.gz, etc.) so other systems can treat the directory as a proper repository.

Method 2: Enable Global Package Caching

Configure DNF to preserve all downloaded packages permanently by editing /etc/dnf/dnf.conf:

[main]
keepcache=True

With keepcache=True, packages remain in /var/cache/dnf/ even after successful installation. Without this setting (the default), DNF cleans the cache after transactions complete.

Important considerations:

This is a system-wide setting affecting all users and all transactions
Cache directory grows over time and requires periodic cleanup
Useful if you frequently reinstall or troubleshoot systems
Not ideal for space-constrained environments

To manually clean cached packages later:

dnf clean all

This removes all cached packages but preserves repository metadata.

Method 3: Download Updates for Offline Systems

To download available updates without applying them immediately:

dnf upgrade --downloadonly --downloaddir=/var/cache/rpms/

This is valuable for staging critical updates, testing on a separate system, or preparing updates for distribution to multiple machines.

Practical Workflow Example

Here’s a typical scenario: preparing packages for a fleet of machines without internet access.

Download packages and dependencies:

dnf install --downloadonly --downloaddir=/mnt/repo/ nginx postgresql postgresql-server

Create repository metadata:
```
createrepo /mnt/repo/
```
Transfer /mnt/repo/ to target systems via USB, NFS, or local mirror

On target systems, add a local repository (/etc/yum.repos.d/local.repo):

[local]
name=Local Repository
baseurl=file:///mnt/repo/
enabled=1
gpgcheck=0

Install from the local repository:

dnf install nginx postgresql postgresql-server

Useful Related Commands

Check available packages before downloading:

dnf list available | grep package-name

Download a package for a different system architecture:

dnf install --downloadonly --downloaddir=/var/cache/rpms/ --forcearch=x86_64 package-name

Get dependency information without downloading:

dnf deplist package-name

Notes for RHEL/CentOS Systems

RHEL and CentOS Stream use DNF (DNF5 on RHEL 9.4+). The syntax remains identical. If using legacy YUM on older RHEL 7 systems, the same --downloadonly and --downloaddir options work, though repository configuration may differ.

2026 Comprehensive Guide: Best Practices

This extended guide covers How to Configure DNF and YUM to Cache Downloaded RPM Packages with advanced techniques and troubleshooting tips for 2026. Following modern best practices ensures reliable, maintainable, and secure systems.

Advanced Implementation Strategies

For complex deployments, consider these approaches: Infrastructure as Code for reproducible environments, container-based isolation for dependency management, and CI/CD pipelines for automated testing and deployment. Always document your custom configurations and maintain separate development, staging, and production environments.

Security and Hardening

Security is foundational to all system administration. Implement layered defense: network segmentation, host-based firewalls, intrusion detection, and regular security audits. Use SSH key-based authentication instead of passwords. Encrypt sensitive data at rest and in transit. Follow the principle of least privilege for access controls.

Performance Optimization

Monitor resources continuously with tools like top, htop, iotop
Profile application performance before and after optimizations
Use caching strategically: application caches, database query caching, CDN for static assets
Optimize database queries with proper indexing and query analysis
Implement connection pooling for network services

Troubleshooting Methodology

Follow a systematic approach to debugging: reproduce the issue, isolate variables, check logs, test fixes. Keep detailed logs and document solutions found. For intermittent issues, add monitoring and alerting. Use verbose modes and debug flags when needed.

Related Tools and Utilities

These tools complement the techniques covered in this article:

System monitoring: htop, vmstat, iostat, dstat for resource tracking
Network analysis: tcpdump, wireshark, netstat, ss for connectivity debugging
Log management: journalctl, tail, less for log analysis
File operations: find, locate, fd, tree for efficient searching
Package management: dnf, apt, rpm, zypper for package operations

Integration with Modern Workflows

Modern operations emphasize automation, observability, and version control. Use orchestration tools like Ansible, Terraform, or Kubernetes for infrastructure. Implement centralized logging and metrics. Maintain comprehensive documentation for all systems and processes.

Quick Reference Summary

This comprehensive guide provides extended knowledge for How to Configure DNF and YUM to Cache Downloaded RPM Packages. For specialized requirements, refer to official documentation. Practice in test environments before production deployment. Keep backups of critical configurations and data.