Graylog installation behind NGINX for proxy and CloudFlare for SSL

[dlevenden]

I’m looking for a Graylog Installation playbook that is causing me some troubles.

I’m trying to get graylog installed behind nginx as a proxy, and then behind cloudflare for SSL.

Anyone know of a blog I can take a look at that addresses this? I’m hosting my platform on http and using cloudflare for the SSL cert. (FYI)

Thanks.

[jochen]

There probably won’t be a blog post 100% matching your requirements.

This being said, an example of a working nginx setup is described in the documentation of Graylog:
http://docs.graylog.org/en/2.4/pages/configuration/web_interface.html#making-the-web-interface-work-with-load-balancers-proxies

[dlevenden]

Right. I thought that might be the case.

I followed that documentation article to get NGINX up and running. I can access the site without using the SSL cert, but get the following error when trying to access it via the SSL cert.

“We are experiencing problems connecting to the Graylog server running on http://XXX.XXX.XXX.XXX:9000/. Please verify that the server is healthy and working correctly.”

Please note: I removed the public IP and replaced with X’s. Thank you.

Any suggestions on how to solve that? I assume it’s Cloudflare blocking the request, but just can’t quite pin it down. Also I have no errors in the logs for Graylog or NGINX.

[jan (Jan Doberstein)]

n http://XXX.XXX.XXX.XXX:9000/.

you might have something configured not using https - maybe you need to set the X-Graylog-Server-URL to something including https and the correct port

[dlevenden]

Yea maybe. Let me try something and I’ll let you know if I figure it out.

Thanks for the help.

[dlevenden]

So I figured it out. In order to work behind cloudflare, just like you said, you have to redirect the X-Graylog-Server-URL url to https://$server_name/api/, then add an API catch in your NGINX to filter/redirect the API requests. I was missing the “Location /api/” section. Thanks again for the help.

    server_name graylog.example.org;

    location / {
            proxy_set_header Host $http_host;
            proxy_set_header X-Forwarded-Host $host;
            proxy_set_header X-Forwarded-Server $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Graylog-Server-URL https://$server_name/api;
            proxy_pass       http://127.0.0.1:9000;
    }
    location /api/ {
            proxy_pass      http://127.0.0.1:9000/api/;
    }