Configure nginx on the server

[joewandy]

Currently PALS Viewer is running on port 8501 (default for Streamlit). It can be accessed on http://134.122.111.79:8501, but we want to access it from http://pals.glasgowcompbio.org/ instead.

We should configure nginx to forward to the right port based on http request. See:

• https://gist.github.com/soheilhy/8b94347ff8336d971ad0
• https://discuss.streamlit.io/t/permission-denied-in-ec2-port-80/798/3
• https://discuss.streamlit.io/t/media-path-for-nginx/2416

[joewandy]

So I followed Section 9 (Redirecting Based on Host Name) in https://gist.github.com/soheilhy/8b94347ff8336d971ad0, and added the following to to /etc/nginx/sites-enabled/default:

server {                                                
    listen 80;                                       
    listen [::]:80;                                  

    server_name pals.glasgowcompbio.org;                         
    location / {
            proxy_pass              http://127.0.0.1:8501/;
    }      
}                                                       

Going to http://pals.glasgowcompbio.org/, the page loads initially, but it throws a lot of timeout (400) errors in the developer console.

[RonanDaly]

Turned out to be a bit tricky. Need to specify external address to streamlit to stop CORS errors. --browser.serverPort=80 --browser.serverAddress=pals.glasgowcompbio.org Also needed to change nginx config

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

server { 
        listen 80;                                       
        listen [::]:80;                                  

        server_name pals.glasgowcompbio.org;
        location / {
                proxy_pass              http://127.0.0.1:8501;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection $connection_upgrade;
        }          
}