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From flyio-pack
Optimizes Fly.io costs by configuring auto-stop/suspend for idle machines, right-sizing VMs, cleaning volumes, and monitoring app/region spend.
How this skill is triggered — by the user, by Claude, or both
Slash command
/flyio-pack:flyio-cost-tuningThis skill is limited to the following tools:
The summary Claude sees in its skill listing — used to decide when to auto-load this skill
Fly.io charges per-second for running machines plus storage. Key levers: auto-stop idle machines, suspend instead of stop, right-size VMs, and clean up unused volumes.
Fly.io charges per-second for running machines plus storage. Key levers: auto-stop idle machines, suspend instead of stop, right-size VMs, and clean up unused volumes.
| Resource | Free Tier | Cost |
|---|---|---|
| shared-cpu-1x (256mb) | 3 VMs free | ~$1.94/month each |
| shared-cpu-1x (512mb) | included | ~$3.88/month |
| shared-cpu-2x (1gb) | - | ~$11.62/month |
| Volumes | 3GB free | $0.15/GB/month |
| Bandwidth | 100GB free | $0.02/GB after |
| IPv4 | 1 free per org | $2/month each |
# fly.toml — stop machines when no traffic
[http_service]
auto_stop_machines = "stop" # Full stop (cheapest, ~5s cold start)
auto_start_machines = true
min_machines_running = 0 # Allow all machines to stop
# Use min_machines_running = 1 only for production apps
# Suspend keeps memory state — resumes in ~100ms but costs ~$0.50/month
[http_service]
auto_stop_machines = "suspend"
# List all apps and their machine counts
fly apps list
# Find idle/stopped machines
fly machine list -a my-app --json | jq '.[] | select(.state != "started") | {id, state, region}'
# Destroy unused apps
fly apps destroy old-app --yes
# List and delete orphaned volumes
fly volumes list -a my-app
fly volumes destroy vol_xxx
# Check memory usage to see if oversized
fly ssh console -a my-app -C "cat /proc/meminfo | head -3"
# Downgrade if using <50% of allocated memory
fly scale vm shared-cpu-1x --memory 256 -a my-app
# Check current month's usage
fly billing # Shows org-level billing
# Estimate per-app cost
fly scale show -a my-app # See VM count and size
For architecture design, see flyio-reference-architecture.
npx claudepluginhub jeremylongshore/claude-code-plugins-plus-skills --plugin flyio-packTunes Fly.io apps for performance: suspend/resume to cut cold starts, VM sizing, multi-region low latency, Postgres PgBouncer pooling, concurrency limits.
Deploy, configure, and manage applications on the Fly.io platform using flyctl CLI, fly.toml configuration, Fly Machines, Fly Volumes, private networking, secrets, health checks, autoscaling, and GitHub Actions CI/CD. Use when deploying any application to Fly.io, writing or modifying fly.toml configuration, managing Fly Machines or Volumes, configuring networking (public services, private 6PN, Flycast, custom domains, TLS), setting secrets, configuring health checks, setting up autostop/autostart or metrics-based autoscaling, deploying with GitHub Actions, managing Fly Postgres databases, or preparing an app for production on Fly.io.
Provides quick reference for Fly.io PaaS deployments including fly.toml config, global distribution, scaling patterns, secrets management, health checks, and troubleshooting. Auto-loads on fly.toml detection.