Nginx 502安装tomcat 8后出现网关错误

安装tomcat8后出现网关错误。我不知道可能是什么问题，检查问题，我使用nginx -t，这是没有显示任何错误我有3个配置文件，我张贴在这里

I run

#nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

nginx.conf

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
events {
    worker_connections 1024;
}
http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
# #
     server {
        listen       80 default_server;
         listen       [::]:80 default_server;
         server_name  _;
         root         /usr/share/nginx/html;
         # Load configuration files for the default server block.
         include /etc/nginx/default.d/*.conf;
         location / {
         }
     ## Add the following lines ##
    location ~ '.php$ {
              root           /usr/share/nginx/html;
              try_files $uri =404;
              fastcgi_split_path_info ^(.+'.php)(/.+)$;
              fastcgi_pass   127.0.0.1:9000;
              fastcgi_index  index.php;
              fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
              include        fastcgi_params;
      }
        error_page 404 /404.html;
            location = /40x.html {
        }
        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}

conf.d/tomcat.conf猫tomcat.conf

server {
  listen          80;
  server_name     45.55.62.37;
 # proxy_cache one;
  location / {
        proxy_pass http://127.0.0.1:8080/;
        proxy_set_header Host $host;
        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 $scheme;
        proxy_set_header X-Forwarded-Host $host;
  }
}

conf.d/php-frm.conf

cat php-fpm.conf
# PHP-FPM FastCGI server
# network or unix domain socket configuration
upstream php-fpm {
        server unix:/run/php-fpm/www.sock;
}

可能是什么问题?我如何解决这个问题?