shad
7c25a6a62e
When the K3s node recovers from an outage, cluster DNS (CoreDNS at 10.43.0.10) can be briefly unavailable, and nginx's startup-time resolution of demo.flow-master.ai + canvas-llm-proxy.demo.svc... fails the conf check, leaving the pod in CrashLoopBackOff. The hostnames sat in proxy_pass directives that nginx resolves at boot. Switched to: - resolver 10.43.0.10 valid=30s ipv6=off; - set $upstream_demo / $upstream_llm; proxy_pass $variable; This forces lazy per-request DNS so transient cluster-DNS hiccups don't kill the canvas-frontend pod. Verified during a real K3s node outage today.
75 lines
3.2 KiB
Nginx Configuration File
75 lines
3.2 KiB
Nginx Configuration File
map $sent_http_content_type $csp_header {
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default "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' data: https://fonts.gstatic.com; img-src 'self' data: blob: https://*.tile.openstreetmap.org https://unpkg.com; connect-src 'self' https://demo.flow-master.ai https://canvas.flow-master.ai wss://canvas.flow-master.ai; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; object-src 'none'";
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}
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server {
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listen 80;
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server_name _;
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root /usr/share/nginx/html;
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index index.html;
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# Hardening — every response carries these.
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add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
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add_header X-Content-Type-Options "nosniff" always;
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add_header X-Frame-Options "DENY" always;
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add_header Referrer-Policy "strict-origin-when-cross-origin" always;
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add_header Permissions-Policy "camera=(), microphone=(self), geolocation=(self), payment=()" always;
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add_header Content-Security-Policy $csp_header always;
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add_header Cross-Origin-Opener-Policy "same-origin" always;
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add_header Cross-Origin-Resource-Policy "same-origin" always;
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add_header X-Robots-Tag "noindex, nofollow" always;
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# Use the cluster CoreDNS resolver so upstream hostnames are resolved
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# lazily (per-request), not at nginx startup. The proxy_pass targets below
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# use $variable form to force this lazy resolution; otherwise nginx fails
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# to start when cluster DNS is briefly unavailable (e.g. node recovery).
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resolver 10.43.0.10 valid=30s ipv6=off;
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# Reverse-proxy /api to the demo backend so live mode is same-origin.
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location /api/ {
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set $upstream_demo "https://demo.flow-master.ai";
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proxy_pass $upstream_demo;
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proxy_set_header Host demo.flow-master.ai;
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proxy_set_header X-Forwarded-Proto https;
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proxy_set_header X-Forwarded-Host $host;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_ssl_server_name on;
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proxy_http_version 1.1;
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proxy_read_timeout 30s;
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proxy_buffering off;
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}
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# In-cluster LLM proxy. Returns 503 when no provider key is configured,
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# so the frontend's deterministic fallback fires gracefully.
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location /internal/canvas-llm/ {
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set $upstream_llm "http://canvas-llm-proxy.demo.svc.cluster.local:8080";
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proxy_pass $upstream_llm;
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proxy_set_header Host $host;
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proxy_set_header X-Forwarded-Proto https;
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proxy_http_version 1.1;
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proxy_read_timeout 60s;
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proxy_buffering off;
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}
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# SPA fallback to index.html for client-side routing.
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location / {
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try_files $uri $uri/ /index.html;
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add_header Cache-Control "no-cache" always;
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add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
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add_header X-Content-Type-Options "nosniff" always;
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add_header X-Frame-Options "DENY" always;
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add_header Referrer-Policy "strict-origin-when-cross-origin" always;
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add_header Permissions-Policy "camera=(), microphone=(self), geolocation=(self), payment=()" always;
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add_header Content-Security-Policy $csp_header always;
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}
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# Hashed static assets cache forever.
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location /assets/ {
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try_files $uri =404;
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add_header Cache-Control "public, max-age=31536000, immutable" always;
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}
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# Hide nginx version on errors.
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server_tokens off;
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}
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