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4 changes: 3 additions & 1 deletion apps/build-secrets.mdx
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---
title: Build Secrets
title: Docker build secrets on Fly.io
sidebarTitle: Build secrets
description: "Use Docker build secrets on Fly.io: mount a secret in your Dockerfile with RUN --mount=type=secret and pass its value with fly deploy --build-secret."
source_url: https://fly.io/docs/apps/build-secrets/
---

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5 changes: 4 additions & 1 deletion networking/egress-ips.mdx
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---
title: Egress IP addresses
title: "Egress IP addresses: static outbound IPs for Fly Machines"
sidebarTitle: Egress IP addresses
description: "Allocate static egress IPs on Fly.io for third-party allowlists, with per-region app-scoped IPv4 and IPv6 pairs, caveats, and migration from machine-scoped IPs."
source_url: https://fly.io/docs/networking/egress-ips/
---
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## Overview

An egress IP is the source address of outbound connections from your app: the IP that an external API, database or payment provider sees, and the one you add to its allowlist.

- By default, outbound (egress) IPs from Fly Machines are **unstable** and may change.
- You can allocate **static egress IPs** for an app (both IPv4 and IPv6) via `fly ips allocate-egress`.
- App-scoped static egress IPs are per-region: you need one for each region where you have machines.
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