Nginx:502坏网关

Question

我的nginx.conf文件是这样的：

user www-data;
worker_processes 4;

events {
    worker_connections 1024;
}

http {

    include mime.types;
    server_tokens off;
    root /var/www/html;

    fastcgi_cache_path /tmp/nginx/cache levels=1:2 keys_zone=phpcache:100m inactive=60m;
    fastcgi_cache_key "$scheme$request_method$host$request_uri";

    server {
        listen 80;
        server_name localhost;
        return 301 https://$host$request_uri;
    }

    server {
        listen 443 ssl http2;
        server_name localhost;

        ssl_certificate /etc/nginx/ssl/nginx.crt;
        ssl_certificate_key /etc/nginx/ssl/nginx.key;

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
        ssl_prefer_server_ciphers on;
        ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DH+3DES:!ADH:!AECDH:!MD5;

        add_header Strict-Transport-Security "max-age=31536000" always;

        index index.php index.html;

        location / {
            try_files $uri $uri/ =404;
        }

        location ~\.php {
            fastcgi_param SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_index  index.php;
            include fastcgi_params;
            fastcgi_pass unix:/run/php/php7.3-fpm.sock;
            fastcgi_cache phpcache;
            fastcgi_cache_valid 200 301 302 60m;
            add_header X-FastCGI-Cache $upstream_cache_status;
            fastcgi_cache_bypass $skip_cache;
            fastcgi_no_cache $skip_cache;
        }
    }
}

现在，在打开一些URL时，它抛出了502个坏网关，但对其他URL则没有。我犯的错误。日志为：

2019/01/10 23:53:39[错误]12139#12139:*5 recv（）在从上游读取响应头时失败（104：由对等方重置连接），客户端：127.0。0.1，服务器：localhost，请求：“GET/wordpress/HTTP/2.0”，上游：fastcgi://unix:/run/php/php7.3-fpm.sock:，主机：“localhost”

请让我知道有什么问题。

Answer 1

如果PHP无法在文件中记录会话信息，则会出现此问题。检查php中的会话保存路径。ini文件。