How to Cut AI Agent Hosting Costs 60% by Migrating from VPS to AWS Fargate Spot
A developer has published a step-by-step guide for migrating a self-hosted, always-on AI agent from a $24/month VPS to AWS Fargate Spot, reducing costs to roughly $9/month. The agent — which connects to chat platforms like Slack or Telegram and runs code in a Docker sandbox — can be containerized and moved without losing persistent state by using Amazon EFS for storage. Key migration challenges include the absence of a Docker socket on Fargate, remapping absolute host file paths, and switching from implicit host AWS credentials to a proper IAM task role. The guide advises skipping a load balancer for outbound-only chat agents, right-sizing RAM based on workload, and choosing Spot instances only if the agent can gracefully reconnect after occasional interruptions. The author cautions that on-demand Fargate at 4 GB RAM can exceed $28/month — more than the original VPS — so cost modeling before committing is essential.
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