feat(gateway): add nginx gateway for maintenance mode fallback
Proxy frontend traffic through Nginx to handle service restarts gracefully Serve a static 503 maintenance page when frontend or backend is unavailable Update deployment design docs and docker-compose configuration
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frontend/gateway/maintenance.html
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224
frontend/gateway/maintenance.html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="robots" content="noindex, nofollow" />
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<meta http-equiv="refresh" content="30" />
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<title>Pokopia Wiki is upgrading</title>
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<style>
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:root {
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color-scheme: light;
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--pokemon-yellow: #ffcb05;
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--pokemon-yellow-soft: #ffe46b;
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--pokemon-blue: #2a75bb;
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--pokemon-blue-deep: #003a70;
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--pokemon-red: #ee1515;
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--pokemon-red-deep: #cc0000;
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--bg: #f2f5fa;
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--bg-alt: #eaf1fb;
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--surface: #ffffff;
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--surface-soft: #f8fafd;
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--ink: #151923;
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--ink-soft: #354052;
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--muted: #687487;
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--line: #d8deea;
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--line-strong: #1f2a3b;
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--shadow-raised: 0 14px 32px rgba(23, 35, 54, .13);
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--font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
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--font-display: "Arial Rounded MT Bold", "Nunito", "Avenir Next Rounded", var(--font-sans);
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}
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* {
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box-sizing: border-box;
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}
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html {
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min-width: 320px;
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min-height: 100%;
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}
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body {
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min-height: 100vh;
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margin: 0;
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color: var(--ink);
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font-family: var(--font-sans);
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background:
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linear-gradient(90deg, rgba(42, 117, 187, .08) 1px, transparent 1px) 0 0 / 32px 32px,
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linear-gradient(rgba(42, 117, 187, .08) 1px, transparent 1px) 0 0 / 32px 32px,
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linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
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}
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main {
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min-height: 100vh;
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display: grid;
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place-items: center;
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padding: 32px 20px;
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}
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.maintenance-card {
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width: min(100%, 560px);
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overflow: hidden;
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border: 1px solid rgba(31, 42, 59, .14);
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border-radius: 8px;
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background: var(--surface);
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box-shadow: var(--shadow-raised);
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}
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.status-ribbon {
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height: 12px;
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background:
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linear-gradient(90deg, var(--pokemon-red) 0 28%, var(--line-strong) 28% 34%, var(--surface) 34% 66%, var(--line-strong) 66% 72%, var(--pokemon-blue) 72% 100%);
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}
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.content {
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padding: clamp(28px, 6vw, 48px);
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}
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.brand {
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display: flex;
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align-items: center;
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gap: 14px;
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margin-bottom: 28px;
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}
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.mark {
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position: relative;
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width: 48px;
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height: 48px;
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flex: 0 0 auto;
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overflow: hidden;
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border: 4px solid var(--line-strong);
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border-radius: 50%;
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background:
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linear-gradient(180deg, var(--pokemon-red) 0 45%, var(--line-strong) 45% 55%, var(--surface) 55% 100%);
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box-shadow: 0 4px 0 rgba(31, 42, 59, .2);
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}
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.mark::after {
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content: "";
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position: absolute;
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inset: 13px;
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border: 4px solid var(--line-strong);
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border-radius: 50%;
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background: var(--surface);
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}
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.brand-name {
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display: block;
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color: var(--pokemon-yellow);
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font-family: var(--font-display);
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font-size: 2rem;
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font-weight: 900;
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line-height: .95;
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-webkit-text-stroke: 2px var(--pokemon-blue-deep);
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text-shadow: 2px 3px 0 var(--pokemon-blue);
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}
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.brand-subtitle {
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display: block;
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margin-top: 4px;
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color: var(--muted);
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font-size: .78rem;
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font-weight: 800;
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letter-spacing: 0;
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text-transform: uppercase;
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}
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.status {
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display: inline-flex;
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align-items: center;
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min-height: 34px;
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padding: 7px 10px;
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border: 1px solid color-mix(in srgb, var(--pokemon-blue) 28%, var(--line));
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border-radius: 8px;
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background: color-mix(in srgb, var(--pokemon-blue) 10%, var(--surface));
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color: var(--pokemon-blue-deep);
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font-size: .82rem;
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font-weight: 800;
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line-height: 1.2;
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text-transform: uppercase;
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}
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h1 {
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margin: 20px 0 10px;
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color: var(--ink);
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font-size: 3rem;
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font-weight: 900;
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letter-spacing: 0;
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line-height: 1.04;
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}
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p {
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max-width: 38rem;
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margin: 0;
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color: var(--ink-soft);
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font-size: 1.12rem;
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line-height: 1.65;
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}
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.meter {
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height: 12px;
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margin-top: 30px;
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overflow: hidden;
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border: 1px solid var(--line-strong);
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border-radius: 999px;
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background: var(--surface-soft);
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}
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.meter span {
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display: block;
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width: 70%;
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height: 100%;
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border-right: 1px solid rgba(31, 42, 59, .28);
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background: linear-gradient(90deg, var(--pokemon-yellow) 0%, var(--pokemon-yellow-soft) 46%, var(--pokemon-blue) 100%);
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}
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@media (max-width: 520px) {
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main {
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align-items: stretch;
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}
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.maintenance-card {
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align-self: center;
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}
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.brand {
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align-items: flex-start;
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}
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.brand-name {
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font-size: 1.65rem;
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}
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h1 {
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font-size: 2rem;
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}
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p {
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font-size: 1rem;
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}
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}
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</style>
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</head>
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<body>
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<main aria-labelledby="maintenance-title">
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<section class="maintenance-card" aria-live="polite">
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<div class="status-ribbon" aria-hidden="true"></div>
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<div class="content">
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<div class="brand">
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<span class="mark" aria-hidden="true"></span>
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<div>
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<span class="brand-name">Pokopia</span>
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<span class="brand-subtitle">Wiki</span>
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</div>
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</div>
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<span class="status">Upgrading</span>
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<h1 id="maintenance-title">Pokopia Wiki is upgrading</h1>
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<p>We'll be online within 5 minutes.</p>
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<div class="meter" aria-hidden="true"><span></span></div>
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</div>
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</section>
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</main>
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</body>
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</html>
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45
frontend/gateway/nginx.conf
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45
frontend/gateway/nginx.conf
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@@ -0,0 +1,45 @@
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server {
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listen 20015;
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server_name _;
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resolver 127.0.0.11 valid=5s ipv6=off;
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location / {
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auth_request /backend-health;
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error_page 500 502 503 504 =503 /maintenance.html;
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set $frontend_upstream http://frontend:20015;
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proxy_http_version 1.1;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_connect_timeout 1s;
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proxy_send_timeout 30s;
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proxy_read_timeout 30s;
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proxy_intercept_errors on;
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proxy_pass $frontend_upstream;
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}
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location = /backend-health {
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internal;
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set $backend_upstream http://backend:3001/health;
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proxy_pass_request_body off;
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proxy_set_header Content-Length "";
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proxy_connect_timeout 1s;
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proxy_read_timeout 1s;
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proxy_pass $backend_upstream;
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}
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location = /maintenance.html {
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internal;
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root /usr/share/nginx/html;
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add_header Cache-Control "no-store" always;
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add_header Retry-After "300" always;
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}
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}
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