每当有人在 Facebook 或 Twitter 上分享我的网站链接时，他们都会收到 502 Bad Gate way。我检查了 nginx 错误日志以查看发生了什么，结果出现了这个错误。
error1615#0: *2375 connect() failed (111: Connection refused) while connecting to upstream, client: 69.171.230.119, server: example.com, request: "GET /328/example/tracks/2023 HTTP/1.1", upstream: "http://127.0.0.1:9000/snapshots?_escaped_fragment_=/328/example/tracks/2023", host: " example.com"
我尝试了很多方法来解决此问题，但没有成功。
#configs
server {
listen 80;
server_name www.example.com;
rewrite ^/(.*) http://example.com/$1 permanent;
}
server {
listen 80;
server_name www.api.example.com;
rewrite ^/(.*) http://api.example.com/$1 permanent;
}
server {
set $maintenance 0;
listen 80;
server_name example.com;
access_log /srv/example-backend/logs/nginx.access.log;
error_log /srv/example-backend/logs/nginx.error.log;
root /srv/example-frontend/www/built/prod;
index index.html;
gzip on;
gzip_types text/plain text/xml text/css application/json application/javascript application/x-javascript;
location = /favicon.ico {
log_not_found off;
}
location /api {
proxy_pass http://api.example.com/api/v1;
proxy_redirect off;
}
location ~* \.(eot|ttf|woff|js|css)$ {
expires max;
add_header Access-Control-Allow-Origin *;
add_header Access-Control-Allow-Headers "X-Requested-With";
add_header Access-Control-Allow-Methods "GET, OPTIONS";
}
location / {
set $prerender 0;
if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest") {
set $prerender 1;
set $prerender_uri $request_uri;
}
if ($args ~ "_escaped_fragment_=(.*)") {
set $prerender 1;
set $prerender_uri $1;
}
if ($uri ~ "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent)") {
set $prerender 0;
set $maintenance 0;
}
if ($prerender = 1) {
set $args _escaped_fragment_=$prerender_uri;
rewrite ^ /snapshots;
}
expires -1;
add_header Pragma "no-cache";
add_header Cache-Control "no-store, no-cache, must-revalidate, post-check=0, pre-check=0";
if ($args ~* disable_maintenance) {
set $maintenance 0;
}
if ($maintenance = 1) {
rewrite ^ /maintenance.html break;
}
try_files $uri /index.html =404;
}
location /snapshots {
proxy_set_header Host $http_host;
proxy_pass http://127.0.0.1:9000;
proxy_connect_timeout 30s;
proxy_redirect off;
}
}
server {
listen 80;
server_name api.example.com;
gzip on;
gzip_types text/plain text/xml text/css application/json application/javascript;
client_max_body_size 2G;
access_log /srv/example-backend/logs/nginx.api.access.log;
error_log /srv/example-backend/logs/nginx.api.error.log;
root /srv/example-backend/www/app/;
index index.php;
more_set_headers 'Access-Control-Allow-Origin: *';
more_set_headers 'Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE';
more_set_headers 'Access-Control-Allow-Headers: Authorization,Cache-Control,Origin,Content-Type,Accept';
location = /favicon.ico {
log_not_found off;
access_log off;
}
location = /robots.txt {
alias /srv/example-frontend/www/built/prod/robots.txt;
}
location ~ /\. {
deny all;
access_log off;
log_not_found off;
}
location / {
if ($request_method = OPTIONS) {
more_set_headers 'Content-Length: 0';
more_set_headers 'Access-Control-Max-Age: 1728000';
more_set_headers 'Content-Type: text/plain';
return 204;
}
try_files $uri /index.php?$args;
}
location ~ /uploads/ {
if ($request_method = OPTIONS) {
more_set_headers 'Content-Length: 0';
more_set_headers 'Access-Control-Max-Age: 1728000';
more_set_headers 'Content-Type: text/plain';
return 204;
}
#count downloads
if ($args ~* dl=1&entityTypeId=(\d+)&entityId=(\d+)&userId=(\d+)&filename=(.+)$) {
set $entityTypeId $1;
set $entityId $2;
set $userId $3;
more_clear_headers Content-Type;
add_header Content-Type application/octet-stream;
add_header Content-Disposition 'attachment; filename=$4';
post_action /count_downloads;
}
expires max;
try_files $uri =404;
}
location /count_downloads {
proxy_pass http://api.example.com/api/v1/downloads/$entityTypeId/$entityId/$userId;
internal;
}
location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
expires 24h;
log_not_found off;
}
#yii specific
location ~ /(protected|framework) {
deny all;
access_log off;
log_not_found off;
}
#m4a streaming
location ~* \.m4a {
types {
audio/mp4 mp4 m4a;
}
mp4;
mp4_buffer_size 1m;
mp4_max_buffer_size 5m;
}
location ~ \.php$ {
include fastcgi_params;
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_pass unix:/var/run/php5-fpm.sock;
}
}
答案1
这意味着 nginx 无法连接到 127.0.0.1 端口 9000 来转发请求。
您需要通过监控相关指标来调查为什么没有服务绑定到该套接字的原因。