I am trying to set up Apache as a frontend proxy to a Docker app. I have done this several times in the past, but for some reason, the new Ubuntu VPS I have is not co-operating. I'm using Apache/2.4.18.
I am using this vhost:
<VirtualHost *:80> ServerName blog.example.com ProxyPass / http://127.0.0.1:8083/ ProxyPassReverse / http://127.0.0.1:8083/ </VirtualHost>
I have enabled the necessary modules:
a2enmod proxy a2enmod proxy_html a2enmod xml2enc
Apache starts up fine, but I get this error in the logs, plus the standard 500 crash message in the browser:
AH01144: No protocol handler was valid for the URL /. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.
This problem is mentioned a lot on the web, but the advice basically reflects the contents of the error message, which is that I need to ensure the proxy modules are loaded. I can confirm 100% they are loaded - in fact, if I replicate the
LoadModule commands in my vhost config, Apache won't start, because the modules are already loaded.
They also look loaded from here too:
$ apachectl -M | grep proxy proxy_module (shared) proxy_html_module (shared)
I can confirm the Docker app is serving an HTTP response (I don't think it's getting that far anyway):
root@agnes:~# wget localhost:8083 --2018-04-02 19:04:46-- http://localhost:8083/ Resolving localhost (localhost)... ::1, 127.0.0.1 Connecting to localhost (localhost)|::1|:8083... connected. HTTP request sent, awaiting response... 200 OK Length: 7 [text/html] Saving to: ‘index.html’ index.html 100%[=========================================================================================================================================>] 7 --.-KB/s in 0s 2018-04-02 19:04:46 (1.20 MB/s) - ‘index.html’ saved [7/7] root@agnes:~# cat index.html Hello
I am rather stuck as to what other problem I could be having. Researching the problem further is not trivial, since search engine results are drowned out by a common answer that does not seem to apply in my case.