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fix: nginx — re-resolve upstream hostname via Docker DNS

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Mirror of wowcheckout e0c349a. Same bug would bite xmrcheckout after any api container rebuild — nginx caches IP at startup and never re-resolves, so a rebuild that gives the api container a new IP leaves nginx 502'ing until manually restarted. Use 'resolver 127.0.0.11 valid=10s' + variable-based proxy_pass so nginx re-resolves every ~10s via Docker's internal DNS.
This commit is contained in:
jwinterm
2026-04-19 16:09:09 -04:00
parent eb15c5202a
commit b34a32c433
2 changed files with 99 additions and 3 deletions
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nginx/conf.d/default.conf
+14 -3
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@@ -1,5 +1,13 @@
limit_req_zone $binary_remote_addr zone=global_rate_limit:10m rate=50r/s;
# Docker's embedded DNS (127.0.0.11) lets nginx re-resolve upstream service
# hostnames. Without `resolver` + a variable-based proxy_pass, nginx resolves
# `api` / `ui` to an IP once at startup and caches it forever — if the api
# container is rebuilt and Docker gives it a new IP, nginx keeps hitting the
# old one and every request returns 502 Bad Gateway until nginx is manually
# restarted. `valid=10s` bounds the stale window to ~10 seconds.
resolver 127.0.0.11 valid=10s ipv6=off;
server {
listen 80;
server_name xmrcheckout.such.software localhost;
@@ -11,7 +19,8 @@ server {
}
location /api/ {
proxy_pass http://api:8000/api/;
set $api_upstream "api";
proxy_pass http://$api_upstream:8000/api/;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -23,7 +32,8 @@ server {
}
location = /openapi.json {
proxy_pass http://api:8000/openapi.json;
set $api_upstream "api";
proxy_pass http://$api_upstream:8000/openapi.json;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -37,7 +47,8 @@ server {
}
location / {
proxy_pass http://ui:3000/;
set $ui_upstream "ui";
proxy_pass http://$ui_upstream:3000/;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;