Hi guys,
I'm preparing a stage in my fablab to teach NodeRED. As I want everyone has its own NodeRED instance, I created multiple instances on my Proxmox server. In front I have an Nginx virtual machine which manages HTTPS and serve the right server function of the URL (ex : 200.example.org => 192.168.9.200 201.example.org => 192.168.9.201 etc ...).
Problem : if I join a NodeRED instance, and after that I try to join another instance, I got a 502 bad gateway error (sometimes I loss both instances for a while).
I used another virtual machine directly on the Proxmox server (so on "local" network) and nodered instances are OK. All other services (other virtual machines) are OK, even when NodeRED instances are not joinable. So the issue seems to come from Nginx<->Here<->NodeRED.
Just to be clear : if I try to join a NodeRED instance => it's OK, I can refresh the page as I want everything is OK. If I try to join another instance, I can join this instance but the mess begins ...
Nginx server config (just one instance showed, others are just a copy/paste of that just changing the urls and names) :
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name 200.example.org;
access_log /var/log/nginx/200.access.log;
ssl on;
ssl_stapling on;
ssl_stapling_verify on;
ssl_certificate /etc/letsencrypt/live/200.example.org/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/200.example.org/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/200.example.org/fullchain.pem;
ssl_session_timeout 1d;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
location ~ /\.well-known{
root /var/www/html;
allow all;
}
location / {
proxy_pass http://192.168.9.200:2880;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header X-Real-IP $remote_addr;
}
}
Both Nginx and NodeRED installs are fresh.
Only modified files are : Nginx sites and settings.json for NodeRED (change port and add admin credentials).
error.log shows this :
2019/05/27 20:46:21 [error] 2367#2367: *684 connect() failed (113: No route to host) while connecting to upstream, client: 37.169.21.20, server: 201.example.org, request: "GET / HTTP/2.0", upstream: "http://192.168.9.201:2880/", host: "201.example.org"
I searched on Google of course but could not found any solutions ...
I also found this topic : 4 x Node-RED Docker containers with Nginx reverse proxy - help
But didn't help :s
So if someone can help me ... Thanks and regards