For a free, open-source antivirus solution for a Linux server, ClamAV is widely considered the best option. It is the most commonly recommended tool for this purpose due to its effectiveness as an on-demand malware scanner and its integration capabilities for server environments.
ClamAV for Linux Servers
ClamAV is a robust, command-line interface (CLI) based antivirus engine maintained by Cisco. It is specifically designed for detecting Trojans, viruses, and other malicious software, and is particularly useful for servers that handle file transfers or email traffic with Windows and macOS systems, preventing the spread of cross-platform malware.
- Key Features:
- Open Source & Free: ClamAV is completely free under the GPL license and is available in most major Linux distribution repositories.
- Cross-Platform Threat Detection: It can scan for and detect malware that affects Windows and Mac operating systems, making it essential for mixed-OS environments.
- Automated Updates: The
freshclamtool automatically updates the virus definitions to ensure protection against the latest known threats. - Server Integration: It can be integrated with mail servers like Postfix and Sendmail to scan email attachments, and configured to run automated, scheduled scans via cron jobs.
- Lightweight: The tool is designed to be efficient and has a minimal impact on server performance.
Install:
# apt install clamav
# apt install clamav-daemon
To scan:
# clamscan --help
To update database:
# freshclam
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