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NodeJS（Debian 9）出现 502 Bad Gateway nginx/1.10.3 错误

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NodeJS（Debian 9）出现 502 Bad Gateway nginx/1.10.3 错误

几天来，我拥有一台服务器，并在该服务器上成功运行了一些用 NodeJS 开发的 Web 应用程序。

一切正常，直到浏览器突然开始显示错误 502 错误网关 nginx/1.10.3尝试访问网站时。我没有进行任何可能导致此类错误的更改。

在网上查找资料，似乎这个错误与 Nginx 将请求定向到我的应用程序的端口的方式有关。我检查了我的 /etc/nginx/sites-available/default 中的配置，一切似乎都正确。这是我的配置的摘录：

# --------------------------
# WEBSITE 1 - www.mywebsite.com
# --------------------------

server {
    listen 80;

    if ($host = mywebsite.com) {
        return 301 https://www.mywebsite.com$request_uri;
    }
    if ($host = www.mywebsite.com) {
        return 301 https://www.mywebsite.com$request_uri;
    }

    server_name www.mywebsite.com mywebsite.com;
    location /{
        proxy_pass "http://127.0.0.1:3000";
    }
}

server {
    listen 443 ssl;

    if ($host = mywebsite.com) {
        return 301 https://www.mywebsite.com$request_uri;
    }

    server_name www.mywebsite.com mywebsite.com;
    location /{
        proxy_pass "http://127.0.0.1:3000";
    }

    # LetsEncrypt Certificates
    ssl_certificate /etc/letsencrypt/live/mywebsite.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/mywebsite.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

# --------------------------
# WEBSITE 2 - www.mywebsite2.com
# --------------------------

server {
    listen 80;

    if ($host = mywebsite2.com) {
        return 301 https://www.mywebsite2.com$request_uri;
    }
    if ($host = www.mywebsite2.com) {
        return 301 https://www.mywebsite2.com$request_uri;
    }

    server_name www.mywebsite2.com mywebsite2.com;
    location /{
        proxy_pass "http://127.0.0.1:3001";
    }
}

server {
    listen 443 ssl;

    if ($host = mywebsite2.com) {
        return 301 https://www.mywebsite2.com$request_uri;
    }

    server_name www.mywebsite2.com mywebsite2.com;
    location /{
        proxy_pass "http://127.0.0.1:3001";
    }

    # [...] More LetsEncrypt Certificates, and more websites [...]

}

另外，我查看了 nginx错误日志文件，我可以看到自从发生此错误以来，每次访问该网站时都会写入此行：

[error] connect() failed (111: Connection refused) while connecting to upstream, client: XXX.XXX.XXX.XXX, server: www.mywebsite.com, request: "GET /aCustomUrl HTTP/1.1", upstream: "http://127.0.0.1:3000/aCustomUrl", host: "www.mywebsite.com"

您知道会发生什么吗？配置对我来说似乎没问题，而且几天前它就成功运行了。我尝试重新启动服务器，但没有帮助...

谢谢大家。

答案1

您的应用是否可直接通过http://127.0.0.1:3000？

尝试：

curl http://127.0.0.1:3000

它有回应嗎？

如果不是，502 Bad Gateway 错误可能意味着您的 nodejs 进程正在崩溃。也许是需要重建的包。比如 sqlite3。您最近升级过 nodejs 吗？

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