https://www.pistack.xyz/tags/health-check/ Recent content in Health-Check on Pi Stack Hugo en-us Sat, 16 May 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-05-16-self-hosted-dns-anycast-health-checking-bird-keepalived-guide/ Sat, 16 May 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-05-16-self-hosted-dns-anycast-health-checking-bird-keepalived-guide/ <p>DNS Anycast is the standard approach for running highly available, geographically distributed DNS services. By advertising the same IP address from multiple locations via BGP, clients are automatically routed to the nearest available DNS server. But what happens when one of those servers goes down? Without health checking, BGP continues advertising the anycast IP from a failed node, sending queries into a black hole.</p> https://www.pistack.xyz/posts/2026-05-26-self-hosted-mail-server-health-monitoring-postfix-exporter-swaks-mailu-guide/ Sat, 16 May 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-05-26-self-hosted-mail-server-health-monitoring-postfix-exporter-swaks-mailu-guide/ <p>Self-hosted email infrastructure requires continuous health monitoring to ensure reliable message delivery. A failing mail server can silently drop messages, cause bounce storms, or become an open relay. Unlike web applications where a down server is immediately obvious, mail server degradation can go unnoticed for hours or days until users start reporting missing messages.</p>