如何解决当上游服务器重启且未恢复正常时,NGINX 显示“bad gateway”
每次我重新启动上游服务器时,我的 Nginx 都会显示“坏网关”,这是正常的,但是后来,当上游服务器重新启动时,Nginx 不会自动恢复,我需要手动重新启动它(Nginx)。
有没有办法让Nginx每隔几秒检查一次上游是否恢复正常?
upstream core {
server core:3001;
}
server {
server_name core.mydomain.com corestg.mydomain.com www.core.mydomain.com;
#listen 80;
#listen [::]:80;
gzip on;
gzip_static on;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+RSS text/javascript application/javascript;
gzip_proxied any;
#gzip_vary on;
gzip_comp_level 6;
gzip_buffers 16 8k;
gzip_http_version 1.1;
listen 443 ssl http2;
listen [::]:443 ssl http2;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;
server_tokens off;
ssl_certificate /etc/ssl/domain.crt;
ssl_certificate_key /etc/ssl/domain.rsa;
error_log /var/log/Nginx/error.log;
access_log /var/log/Nginx/access.log;
location / {
proxy_ssl_session_reuse off;
proxy_pass http://core;
proxy_buffers 8 24k;
proxy_buffer_size 2k;
proxy_http_version 1.1;
proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
proxy_ignore_headers Set-Cookie;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_set_header X-Nginx-Proxy true;
# proxy_set_header Host $http_host;
proxy_set_header Host $host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_cache_bypass $http_upgrade;
proxy_redirect off;
}
}
解决方法
我测试 NGINX 的设置:
Docker-Container 模拟后端暴露 9002 端口。
afd9551abc54 nginx "/docker-entrypoint.…" About a minute ago Up 11 seconds 0.0.0.0:9002->80/tcp laughing_pike
NGINX 配置
# Defined upstream block.
upstream backend {
server 127.0.0.1:9002;
}
#Main Server block
server {
listen 80;
location / {
proxy_pass http://backend;
proxy_set_header Host $host;
}
}
停止容器将导致 502 Bad Gateway。在不重新启动/重新加载的情况下启动容器 NGINX 将数据发送到上游服务器。所以基本上这应该可行!
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