HAProxy

Publishing Internal APIs from DMZ Without Direct LAN Connections: Five Tested Architectures

When an API gateway resides in the DMZ but security policies forbid outbound connections into the LAN, organizations must adopt alternative patterns to expose internal services synchronously. The article examines five production-ready approaches built on the NEOMSA APIM platform, ranging from custom request-reply logic over Kafka to zero-code solutions using ActiveMQ Artemis and experimental reverse HTTP in HAProxy. Each pattern is evaluated against criteria such as the need for DMZ-to-LAN firewall rules, volume of custom code, support for streaming responses, and measured performance. Load tests on the Artemis-based bridge reached 50 requests per second with a 95th percentile latency of approximately 100 ms, while the Kafka implementation required roughly 2,500 lines of Java to emulate missing reply semantics. The analysis highlights trade-offs in operational complexity, vendor support implications, and security posture, particularly the benefit of preventing any outbound initiation from the DMZ.

From HAProxy to VLESS+Reality: Overcoming DPI Blocks for MTProto Telegram Proxies

A detailed case study describes the challenges of running an MTProto proxy for Telegram on Russian servers facing ISP-level DPI. Initial attempts using HAProxy TCP relays and SOCKS5 tunnels failed because modern DPI systems detect MTProto and fake-TLS signatures regardless of transparent forwarding. The author eventually succeeded by layering mtg with an Xray VLESS+Reality tunnel that performs genuine TLS 1.3 handshakes to legitimate domains. Key configuration pitfalls included the xtls-rprx-vision flow breaking non-TLS payloads, missing mux causing handshake timeouts on short-lived connections, and provider-specific network policies. Final architecture places mtg and an Xray client on the Russian entry server while the foreign exit server runs Xray in VLESS+Reality inbound mode. The guide supplies complete docker-compose examples, key generation commands, and a checklist of common misconfigurations to avoid.

OTUS Publishes Extensive Digest Covering Kubernetes, GitLab CI, DevSecOps and Infrastructure Reliability

OTUS has released a large-scale digest that compiles free lessons, practical articles and advanced courses focused on real-world infrastructure challenges. The collection addresses interconnected topics including Kubernetes container orchestration, GitLab CI pipeline automation, observability with OpenTelemetry, network troubleshooting, and DevSecOps practices. Readers can explore specific lessons on secrets management with Vault, load testing, RAID recovery, and kernel-level protections in Linux. The digest also features in-depth articles on Docker Compose configuration, CrowdSec migration, L2 network loops, and self-service deployment models. For experienced professionals, OTUS offers specialized courses on high-load systems, PostgreSQL administration, Linux kernel development, and advanced networking with BGP and OSPF.