Apache module is not enabled-CodePudding

Attempting to use directives for an Apache module that is not enabled will result in apachectl configtest messages like the following:Example Error Output (13)Permission denied: AH00957: HTTP: attempt to connect to 127.0.0.1:9090 (127.0.0.1) failed The Apache error log may have more information.

I tried verifying logs and searched the error in online but unable to find anything. Can someone please help with the same.

CodePudding user response：

Apache log files are a very helpful resource for troubleshooting. Generally, any error that you receive in a browser or other HTTP client will have a corresponding entry in Apache’s logs. Sometimes Apache will also output errors related to configuration, built-in modules, and other debugging information to its log files.

To examine log files for errors while troubleshooting Apache on a Fedora, CentOS, or RedHat server, examine the /var/log/httpd/error_log file.

If you are troubleshooting a Debian or Ubuntu derived system, examine /var/log/apache2/error.log for errors using a tool like tail or less. For example, to view the last two lines of the error log using tail, run the following command:

sudo tail -n 2 /var/log/apache2/error.log

Substitute the number of lines that you would like to examine in place of the number 2 in the command. On a CentOS or Fedora system, the log file to examine is /var/log/httpd/error_log.

An example error will resemble something like the following lines, regardless of which Linux distribution you are using to run your Apache server:

Error Log Examples
[Wed Jul 15 01:34:12.093005 2020] [proxy:error] [pid 13949:tid 140150453516032] (13)Permission denied: AH00957: HTTP: attempt to connect to 127.0.0.1:9090 (127.0.0.1) failed
[Wed Jul 15 01:34:12.093078 2020] [proxy_http:error] [pid 13949:tid 140150453516032] [client 127.0.0.1:42480] AH01114: HTTP: failed to make connection to backend: 127.0.0.1

The two lines in this output are distinct error messages. They both reference the module causing the error (proxy in the first line, proxy_http in the second) and include an error code that is specific to the module. The first one, AH00957, indicates that the Apache server attempted to connect to a backend server (127.0.0.1 on port 9090 in this case) using the proxy module but failed to do so.

The second error is derived from the first: AH01114 is a proxy_http module error that also indicates that Apache was unable to connect to the configured backend server to make an HTTP request.

These example lines are just for illustration purposes. If you are diagnosing errors with your Apache server, chances are the error lines in your logs will have different contents than these. Regardless of your Linux distribution, the format of any error lines in your logs will include the relevant Apache module and error code, as well as a text description of the error.

Once you have an idea of what might be causing problems with your Apache server you can continue researching and troubleshooting the issue. The error code and text description are especially useful, since they give you explicit and specific terms that you can use to narrow down the range of possible causes of a problem.