我已经将我的node.js express应用程序部署到了DigitalOcean，在那里我使用Nginx和PM2运行我的应用程序。除了我尝试将个人资料图片上传到网站之外，其他所有东西都工作正常。该图像未存储在数据库中，而是被发送到Cloudinary，在此托管我的图像和视频。
当我尝试上传图像时，该应用程序立即转到502 Bad Gateway，并且当我在浏览器中单击“返回”时，似乎PM2已重新启动，原因是我将不得不再次登录。
此功能在我的本地主机上运行良好，因此我认为我的nginx配置或类似的地方可能有问题。
我的Nginx网站可用的默认外观如下：
root /var/www/html;
# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;
server_name (DOMAIN) (DOMAIN);
location / {
proxy_pass http://127.0.0.1:8080/;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
proxy_buffer_size 1024k;
proxy_buffers 4 1024k;
proxy_busy_buffers_size 1024k;
}
listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/(DOMAIN)/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/(DOMAIN)/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = (DOMAIN)) {
return 301 https://$host$request_uri;
} # managed by Certbot
if ($host = (DOMAIN)) {
return 301 https://$host$request_uri;
} # managed by Certbot
listen 80 default_server;
listen [::]:80 default_server;
server_name (DOMAIN) (DOMAIN);
return 404; # managed by Certbot
}
我的nginx配置看起来像这样：
user www-data;
worker_processes auto;
pid /run/nginx.pid;
events {
worker_connections 768;
# multi_accept on;
}
http {
##
# Basic Settings
##
send_timeout 10m;
client_header_timeout 10m;
client_body_timeout 10m;
client_max_body_size 100m;
large_client_header_buffers 8 256k;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
当我尝试将图像上传到Cloudinary时，我已经检查了nginx的错误日志，它说连接过早关闭。这是日志：
2019/05/03 23:33:57 [error] 1798#1798: *5 upstream prematurely closed connection while reading response header from upstream, client: (IP LOCAL MACHINE), server: (DOMAIN), request: "POST /profile/5cc44420618f3606623288ec/settings/imageupload HTTP/1.1", upstream: "http://127.0.0.1:8080/profile/5cc44420618f3606623288ec/settings/imageupload", host: "(DOMAIN)", referrer: "https://(DOMAIN)/profile/5cc44420618f3606623288ec/settings
2019/05/03 23:33:57 [error] 1798#1798: *5 connect() failed (111: Connection refused) while connecting to upstream, client: (IP LOCAL MACHINE), server: (DOMAIN), request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8080/favicon.ico", host: "(DOMAIN)", referrer: "https://(DOMAIN)/profile/5cc44420618f3606623288ec/settings/imageupload
这是我的节点应用程序发出的POST路由：
router.post("/profile/:id/settings/imageupload", middleware.checkIfUserIsUser, upload.single('avatar'), function(req, res) {
execForUser(req, res, function(foundUser) {
if (foundUser.avatarId) {
cloudinary.v2.uploader.destroy(foundUser.avatarId, function(err) {
if (err) {
createError("E30: Error happened while deleting old profile picture from Cloudinary.");
req.flash("error", "Oops! Something wen't wrong while trying to update your profile picture. Please try again.");
return res.redirect("back");
}
cloudinary.v2.uploader.upload(req.file.path, { moderation: "aws_rek" }, function(error, result) {
if (error) {
req.flash("error", "Oops! Seems like this image doesn't live up to our standards. Please check that this is not an adult image or contains nudity.");
return res.redirect("back");
}
User.findByIdAndUpdate(req.params.id, { $set: { avatar: result.secure_url, avatarId: result.public_id } }, { new: true }, function(err, updatedUser) {
if (err) {
createError("E31: Error happened while saving new profile picture to profile.");
req.flash("error", "Oops! Something went wrong while trying to save your new profile picture. Please try again.");
res.redirect("back");
}
else {
res.redirect("/profile/" + req.params.id + '/settings');
}
});
});
});
}
else {
cloudinary.v2.uploader.upload(req.file.path, { moderation: "aws_rek" }, function(error, result) {
if (error) {
req.flash("error", "Oops! Seems like this image doesn't live up to our standards. Please check that this is not an adult image or contains nudity.");
return res.redirect("back");
}
User.findByIdAndUpdate(req.params.id, { $set: { avatar: result.secure_url, avatarId: result.public_id } }, { new: true }, function(err, updatedUser) {
if (err) {
createError("E31: Error happened while saving new profile picture to profile.");
req.flash("error", "Oops! Something wen't wrong while trying to save your profile picture. Please try again.");
res.redirect("back");
}
else {
res.redirect("/profile/" + req.params.id + '/settings');
}
});
});
}
});
});
我真的不敢一个人解决这个问题。在我的本地计算机上，甚至在我部署到heroku时，它都可以完美运行。但是现在我在digitalocean上使用了nginx，那么我遇到了502。我应该在我的配置文件中进行某种设置以允许上传文件吗？我是Nginx的新手，如果这是我犯的一个愚蠢的错误，请原谅我。
应该工作的方式是，我单击“上传”，它与Cloudinary联系，以检查图像是否包含裸露，如果没有，它会上传并发送回一个我可以用来引用该图像的URL。