Topic
systemd
CVE-2026-98432: Temporary nftables Filter with Auto-Rollback for Ubuntu Servers
Vulnerabilities & Exploits
Prod is Down: Free gVisor-Based Simulator Gives Strangers Root Access for Realistic Linux Incident Training
Other
What Server Logs Reveal About Attackers: Analyzing Suspicious Requests on Linux
OtherDeploying Self-Hosted Hysteria 2 Proxy on Debian-Based Linux VPS via Terminal
A detailed guide explains how to set up a personal Hysteria 2 proxy server on a KVM VPS running Debian or Ubuntu without any web panels. The process begins with generating ed25519 SSH keys, hardening the sshd_config file, and restricting access with ufw to only TCP port 22 and UDP port 443. Hysteria 2 is downloaded from GitHub, made executable, and configured using a TOML file that enables salamander obfuscation and a self-signed TLS certificate. A custom systemd unit ensures the service restarts on failure. The client configuration includes SHA256 pinning of the server certificate to prevent MITM attacks. The guide emphasizes manual CLI operations that apply equally to other services such as Nginx and stresses checking local laws before deployment.
Secure Custom Domain Setup for Client Status Pages Using CNAME, Certbot and Go Instead of ACME On-Demand
A detailed case study describes how a monitoring service implemented white-label status pages on customer domains without relying on ACME on-demand certificate issuance. The approach uses pre-validated domains stored in a database, background DNS checks via CNAME or A-record matching, and a root helper script running on a systemd timer to handle certbot issuance and nginx configuration. Key design choices separate privileges so the Go application never touches certificates or nginx directly, while loopback endpoints are protected against proxy header spoofing. The solution explicitly addresses risks such as DoS through malicious Host headers exhausting Let's Encrypt rate limits, private key exposure, and first-visitor latency during TLS handshakes. Hysteresis in DNS status prevents temporary resolution glitches from disabling active customer pages. The entire implementation stays under a few hundred lines of code and runs reliably on a single server with nginx in front of the Go application.