Monit

Monit is a lightweight, open-source utility designed for managing and proactively monitoring Unix/Linux systems. It automates maintenance and repair tasks to ensure essential processes run smoothly. With Monit, you receive alerts when issues arise, providing continuous and reliable supervision of your servers.

Automatic Service Monitoring and Management

You can use Monit to monitor essential system processes such as sendmail, sshd, apache, or mysql. It detects when these services are not functioning properly and can automatically restart or stop them to prevent prolonged downtime. This helps minimize service interruptions and maintain your infrastructure’s availability.

Monitoring Files, Directories, and Filesystems

Monit lets you monitor files and directories for changes, including timestamp, size, or checksum modifications (MD5/SHA1). This feature is especially useful for security purposes, alerting you if sensitive files are altered unexpectedly. You can also track disk space usage to avoid running out of storage.

Network and System Resource Checks

Monit tests network connections (TCP, UDP, Unix sockets) locally or remotely and can verify major Internet protocols like HTTP or SMTP. Additionally, it monitors system resource usage such as CPU, memory, load averages, and network interfaces, helping you quickly identify issues like DDoS attacks or abnormal resource consumption.

Monit integrates smoothly with init systems (init, upstart, systemd), runs autonomously without extra dependencies, and includes a lightweight web interface for managing and viewing status in real time. It is an ideal tool to ensure Linux server stability by automating monitoring and management for you.