Resolved "502 Bad Gateway" with nginx reverse proxy for openhab cloud

[proton23]

Server operating system version

Ubuntu 20.04.6 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.52

Hi,
I'm trying to make openhab cloud (GitHub - openhab/openhab-cloud: Cloud companion for openHAB instances) work on Plesk but it seems impossible for me.
To explain briefly how it should work:
- Local openhab instance connects with UUID and secret to openhab cloud instancen. They are connected via websocket
(seems to work since local instance is shown as online)
- User calls OPENHAB.mydomain.com (where openhab cloud is running) and logs in
- Application shows a link to HOME.mydomain.com, which get proxied to the dashboard of the local instance (I my case it does not work)

This is the additional directive for openhab.mydomain.com

location /css {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/css;
}
location /js {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/js;
}
location /img {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/img;
}
location /bootstrap {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/bootstrap;
}
location /font-icons {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/font-icons;
}
location /fonts {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/fonts;
}
location /js-plugin {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/js-plugin;
}
location /staff/js-plugin {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/js-plugin;
}
location /downloads {
    alias /var/www/vhosts/mydomain.com/oh.mydomain.com/public/downloads;
}

location ~ /.well-known {
    allow all;
}

location ~ ^/(socket.io|rest|images|static|rrdchart.png|chart|openhab.app|WebApp|CMD|cometVisu|proxy|greent|jquery|classicui|ui|basicui|doc|start|icon|habmin|remote|habpanel|ifttt/v1/actions/command) {
    proxy_pass http://SERVER-IP:3000;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Host $host;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    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;
}

location / {
    proxy_pass http://SERVER-IP:3000;
    proxy_redirect off;
    proxy_http_version 1.1;
    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 https;
}

And this the additional directive for home.mydomain.com

location / {
    proxy_pass http://SERVER-IP:3000;
    proxy_redirect off;
    proxy_http_version 1.1;
    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 https;
}

I get "502 Bad Gateway" with this.
ChatGPT told me that I should consolidate those directives to something like this

server {
    listen 80;
    listen [::]:80;
    server_name myopenhab.org www.myopenhab.org home.myopenhab.org;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;
    server_name myopenhab.org www.myopenhab.org home.myopenhab.org;

    charset utf-8;

    access_log /var/log/nginx/my.openhab.org-access.log;
    error_log /var/log/nginx/my.openhab.org-error.log;
    client_max_body_size 300m;

    root /var/www/html;

    location ~ /.well-known {
        allow all;
    }

    location ~ ^/(socket.io|rest|images|static|rrdchart.png|chart|openhab.app|WebApp|CMD|cometVisu|proxy|greent|jquery|classicui|ui|basicui|doc|start|icon|habmin|remote|habpanel|ifttt/v1/actions/command) {
        proxy_pass http://localhost:3000;
        proxy_redirect off;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        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;
    }

    location / {
        proxy_pass http://localhost:3000;
        proxy_redirect off;
        proxy_http_version 1.1;
        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 https;
    }
}

How can I do something like this in Plesk?

Best regards

 

[Peter Debik]

What's happening on port 3000? Is there a service installed that listens on it and responds to it?

 

[proton23]

Actually I'm not sure. In app.js on line 117 there is

app.set('port', process.env.PORT || 3000);

and the application is running but if I run

sudo netstat -tulpn | grep LISTEN

no service is listening on port 3000.

 

[Maarten]

OpenHAB is a Node.js application. Did you start it using the Node.js Toolkit?

 

[proton23]

I'm not sure what you mean with toolkit. I started it with node.js dashboard from Plesk.

 

[Maarten]

The Node.js Toolkit is the new name for Node.js:

Plesk Obsidian 18.0.52:
- Updated the Node.js Toolkit extension (former Node.js) to version 2.3.0

 

[proton23]

So, I guess the answer is yes?
How can I make the the application start on port 3000 in Plesk?

 

[proton23]

I changed

app.set('port', process.env.PORT || 3000);

to

app.set('port', 3000);

to make sure the app is using port 3000, but after restart there is still so service listening on port 3000.
The application is available when I access oh.mydomain. What am I missing here?
Should I open a new thread, because the topic has moved away from the title quite a bit?

Best regards

 

[proton23]

I was able to solve the problem.
After activating node.js I was able to access the page but there was no process listening on port 3000.
Under run nodejs commands I had to execute "run start" to make node listen on port 3000.
Now all configuration works as expected. Thanks to everyone trying to help!

Best regards

 

[proton23]

How can I mark this as resolved?

 

[Maarten]

Glad to hear you solved the issue!
I've marked the thread as "Resolved"