A licensing web tier stores sessions only in local memory on each E…

Question

A licensing web tier stores sessions only in local memory on each EC2 host, so Auto Scaling replacements and load-balancer drains drop citizen logins. Which reliability pattern best enables elastic, ASG-friendly behavior?

Accepted Answer

Move sessions to a shared store such as ElastiCache or another external session state service so any healthy instance can serve the citizen after scale-in or replacement — Sessions glued to one box hate Auto Scaling—the citizen gets bounced when that box leaves. Park session state in a shared cache so any fresh instance can pick up the clipboard.

Answer

Disable Auto Scaling and run one oversized instance forever to protect in-memory sessions

Answer

Sticky-session forever to a single unhealthy host without health checks

Answer

Replicate /tmp session files with manually copied scp scripts between hosts during incidents

A licensing web tier stores sessions only in local memory on each EC2 host, so Auto Scaling replacements and load-balancer drains drop citizen logins. Which reliability pattern best enables elastic, ASG-friendly behavior?

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