What is AWS ALB host header routing?

It's ALB rules that inspect the Host header (e.g., app1.com) and forward to specific target groups—perfect for multi-subdomain setups on one balancer.

How to set up HTTPS on ALB with custom SSL?

Import .crt, .key, chain to ACM, attach to 443 listener. Avoid ACM requests; use import for bought certs.

Can I use CNAME for ALB without Route53?

Yes—point subdomains via Google Cloud DNS (or any) CNAME to the ALB's DNS name. Propagates fast, no vendor lock.

☁️ Cloud & Infrastructure

One ALB to Rule Them All: HTTPS Routing, Subdomains, No Route53 Needed

Tired of overpaying for multiple ALBs? This deep dive shows how one balancer handles your whole microservices squad with HTTPS, subdomain smarts, and zero Route53 dependency. Production-proven, future-ready.

theAIcatchup Apr 10, 2026 4 min read

AWS Application Load Balancer dashboard showing HTTPS listener rules and host header conditions

⚡ Key Takeaways

One ALB handles multiple ECS Fargate services via host headers, slashing costs dramatically. 𝕏
Import custom SSL to ACM for HTTPS—guard that private key fiercely. 𝕏
Google Cloud DNS CNAMEs free you from Route53, enabling multi-cloud flexibility. 𝕏

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theAIcatchup

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#AWS ALB #ECS Fargate #HTTPS ACM Import #HTTPS ALB Setup #Host Header Routing

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