Re: Running Apache in Single Process Mode for Docker Container?

[David Aronchick <aronchick@xxxxxxxxx>]

Thanks for all the help all! I dug into the apachectl and realized I was using the config file in sites-enabled, instead of the top level /etc/apache2/apache.conf file. The latter file installs all the modules in /mods-enabled, which is what was missing. (for the curious, I also had to copy all the env vars into a Dockerfile so that the binary executed with the right environment variables set)

So the net is, the following command now starts apache2 correctly:

/usr/sbin/apache2 -DFOREGROUND -DNO_DETACH -f /etc/apache2/apache2.conf

However, it still seems to spin up three threads, which I can't figure out why. Thanks again all!

On Sun, Oct 25, 2015 at 7:52 PM, Kurtis Rader <krader@xxxxxxxxxxxxx> wrote:

On Sun, Oct 25, 2015 at 7:26 PM, David Aronchick <aronchick@xxxxxxxxx> wrote:

Thank you, this is very helpful! Is there any way to get an output of all the items on the command line ultimately used by apachectl? For example, when I do the following, it fails - I assume I'm missing something.

$ source /etc/apache2/envvars
$ /usr/sbin/apache2 -f /etc/apache2/sites-available/rails.conf  -DFOREGROUND -DNO_DETACH 
AH00534: apache2: Configuration error: No MPM loaded.

As Eric Covener pointed out you probably have a "envvars" file that contains additional environment variables your Apache HTTP server configuration expects to be defined. For example, on my Mac OS X server the HomeBrew installed apachectl script includes these statements:

if test -f /usr/local/Cellar/httpd24/2.4.16/bin/envvars; then

  . /usr/local/Cellar/httpd24/2.4.16/bin/envvars

fi

If you're unfamiliar with UNIX shell scripting that says that if the file exists assume it contains shell commands and run them in the context of the current shell. This is most often done as a way to set so-called "environment" variables that are inherited by subsequent processes; including the Apache HTTP server.

Take a look at your apachectl script for the equivalent block of code then look at the contents of the file it refers to. You'll want to ensure you have set and exported the same variables. Probably the easiest way is to run the same "." (dot or "source") command before invoking the httpd binary.

--

Kurtis Rader

Caretaker of the exceptional canines Junior and Hank