How do I import custom SSL to AWS ACM for ALB?

Grab cert body (.crt), private key (.key), chain. Console > ACM > Import. Paste, tag, done. Status: Issued.

What's AWS ALB host header routing and how to set it up?

Rules on HTTPS listener: Condition Host header = app1.domain.com, Action Forward to target group. Priority low to high.

Yes. Point subdomain CNAME to ALB's DNS name (e.g., alb-123.elb.region.amazonaws.com). TTL 300. Instant.

Tired of basic ALB configs tanking your ECS deploys? This no-BS guide cuts through the AWS fog for HTTPS, subdomain routing, and cheap DNS tricks.

theAIcatchup Apr 10, 2026 4 min read

One ALB for multiple services slashes costs 5x — bill by hour, not headcount. 𝕏
Import custom SSL to ACM for non-Route53 freedom; skip freebies for production control. 𝕏
Host header rules + Google DNS CNAME = flexible routing without AWS lock-in. 𝕏

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#AWS ALB #ECS Fargate #HTTPS SSL Import #Host Header Routing

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Originally reported by Dev.to