Apache 中的不同配置文件取决于环境

Question

I am trying to move Apache from Linux servers to Openshift servers based on the Docker Image http:2.4, and the basics are working. But the original servers are in different environments and data centers, so I have to find a way to combine all the different variations of httpd.conf files into one file with conditionals.

I will have Linux environment variables in Openshift similar to this:

oc_env=dev # [or stage or prod]  # environment
oc_loc=dc1 # [or dc2]            # data center

Based on the combinations of these two variables, different settings have to be loaded, probably using include .

I have played around with <If> and Define , but so far I have not been able to get anything to work consistently the way I need it to. Here is my current test - mydir is NOT part of the final design, I'm only using it to test conditionals easier:

Define mydir "/usr/local/apache2/htdocs"  # set the default
<If "osenv('oc_env') == 'dev'">
  LogMessage "dev"
  Define mydir "/usr/local/apache2/htdocs/dev"  # override default
</If>
LogMessage "mydir is set to"
LogMessage ${mydir}
DocumentRoot ${mydir}

If I set oc_env (in Openshift, so it will show up in env within the Linux environment), here is what happens in the log file:

oc_env=dev

mydir is set to 
/usr/local/apache2/htdocs/dev
dev

oc_env=other

mydir is set to
/usr/local/apache2/htdocs/dev

So the Define command is executed a second time even if the conditional is false, and it is using the wrong definition.

I'm also confused about the order in which the entries show up ( LogMessage "dev" shows at the end although it is earlier in the code).

In the end, I need to have a httpd.conf file with multiple areas where it needs to run a check like this:

# section 1
"if oc_env is dev and oc_loc is dc1 then load external config file dev_dc1_part1.conf else if ....."
[...]
# section 2
"if oc_env is dev and oc_loc is dc1 then load external config file dev_dc1_part2.conf else if ....."

The current file is pretty complex.

I'm probably on a completely wrong track with this. My next attempts will revolve around SetEnvIf , but after having worked on this for a few days now, I am running short on time, so I'm hoping someone can point me in the right direction.

Thanks!

--- update ---

SetEnvIf doesn't seem to be the right tool for the job, either.

So I tried Include , and now I'm more confused than ever...

<If "osenv('oc_env') == 'dev'">
  LogMessage "dev"
  Include /usr/local/apache2/conf/inc_dev.conf
    # file content: Define mydir "/usr/local/apache2/htdocs/dev"
</If>
<ElseIf "osenv('oc_env') == 'stage'">
  LogMessage "stage"
  Include /usr/local/apache2/conf/inc_stage.conf
    # file content: Define mydir "/usr/local/apache2/htdocs"
</ElseIf>
<Else>
  LogMessage "test"
  Include /usr/local/apache2/conf/inc_test.conf
    # file content: Define mydir "/usr/local/apache2/htdocs"
</Else>

LogMessage ${mydir}

The result:

/usr/local/apache2/htdocs
dev

How is this even possible? Is Include ALWAYS executed even if the If clause doesn't apply to it?

Please let me know what I can do to make this work.