Disk space monitoring made easy

Disk Notifier is a disk space monitoring service designed to help prevent server downtime caused by full disks. It addresses the common problem of servers becoming unavailable due to running out of disk space by providing timely alerts before disks reach capacity. The tool is intended for users managing Linux servers and emphasizes simplicity and security in its deployment process.

Deployment requires only adding a single line to a user's authorized_keys file on an SSH-enabled server, with no additional software installation or new ports required. Disk Notifier leverages existing, widely used system components—specifically, the server's SSH daemon and the df command—to perform its checks. This approach eliminates the need for proprietary software, updates, or elevated permissions, and does not require any modifications to firewall settings. Regular checks are performed on the server's disks several times a day, and the service includes mechanisms to retry checks if one fails.

The platform offers round-the-clock monitoring and notifies users when a disk is approaching full capacity. Notifications can be sent via email and Telegram. Disk Notifier supports monitoring multiple servers, with pricing tiers that include a free option for monitoring a single server, a mid-tier for up to five servers with email support, and a higher tier for up to twenty servers. Users interested in monitoring more than twenty servers are invited to contact the service for further options. Billing can be monthly or annually, and all plans include regular checks and notification features.

Disk Notifier is positioned as a straightforward observability tool for Linux server administrators and operators who seek an easy, low-maintenance solution for disk space monitoring without the overhead of installing and maintaining additional software.