Question

I have an Apache server configured with many virtual hosts and would like to be able to filter them using grep like so..

# httpd -S | grep "myStr"

.. however, this approach doesn’t work – I’m still seeing all my virtual hosts listed. Any ideas how I can actually do this?

Here’s a sample of the output from httpd -S

[root@224136 config]# httpd -S
VirtualHost configuration:
184.22.xxx.33:80       is a NameVirtualHost
         default server default (/etc/httpd/conf/kloxo/default.conf:4)
         port 80 namevhost default (/etc/httpd/conf/kloxo/default.conf:4)
         port 80 namevhost webmail (/etc/httpd/conf/kloxo/webmail.conf:6)
         port 80 namevhost xxxxxx.com (/home/httpd/xxxxxx.com/conf/kloxo.xxxxxxx.com:4)
         port 80 namevhost twptest.xxxxxx.com (/home/httpd/twptest.xxxxxx.com/conf/kloxo.twptest.xxxxxx.com:4)
         port 80 namevhost yyyyyyy.com (/home/httpd/yyyyyy.com/conf/kloxo.yyyyyyy.com:4)
         port 80 namevhost zzzzzzzz.com (/home/httpd/zzzzzzz.com/conf/kloxo.zzzzzzzz.com:4)
         port 80 namevhost expenses.zzzzzzzz.com (/home/httpd/expenses.zzzzzzz.com/conf/kloxo.expenses.zzzzzzz.com:4)
         port 80 namevhost aaaaaaaa.cz (/home/httpd/aaaaaaaaaaaa.cz/conf/kloxo.aaaaaaaaaaa.cz:4)
         port 80 namevhost aaaaaaaaaaa.cz (/home/httpd/aaaaaaaaaaaaa.cz/conf/kloxo.aaaaaaaaaa.cz:142)

Answer 1

Since you say that “I’m still seeing all my virtual hosts listed” I suspect you need to redirect STDERR to STDOUT as seen below (assuming bash) out.py is just a pythonscript that writes some output to STDERR using sys.stderr.write()

$ ./out.py | grep zzzzzzzz

VirtualHost configuration:
184.22.xxx.33:80       is a NameVirtualHost
         default server default (/etc/httpd/conf/kloxo/default.conf:4)
         port 80 namevhost default (/etc/httpd/conf/kloxo/default.conf:4)
         port 80 namevhost webmail (/etc/httpd/conf/kloxo/webmail.conf:6)
         port 80 namevhost xxxxxx.com (/home/httpd/xxxxxx.com/conf/kloxo.xxxxxxx.com:4)
         port 80 namevhost twptest.xxxxxx.com (/home/httpd/twptest.xxxxxx.com/conf/kloxo.twptest.xxxxxx.com:4)
         port 80 namevhost yyyyyyy.com (/home/httpd/yyyyyy.com/conf/kloxo.yyyyyyy.com:4)
         port 80 namevhost zzzzzzzz.com (/home/httpd/zzzzzzz.com/conf/kloxo.zzzzzzzz.com:4)
         port 80 namevhost expenses.zzzzzzzz.com (/home/httpd/expenses.zzzzzzz.com/conf/kloxo.expenses.zzzzzzz.com:4)
         port 80 namevhost aaaaaaaa.cz (/home/httpd/aaaaaaaaaaaa.cz/conf/kloxo.aaaaaaaaaaa.cz:4)
         port 80 namevhost aaaaaaaaaaa.cz (/home/httpd/aaaaaaaaaaaaa.cz/conf/kloxo.aaaaaaaaaa.cz:142)

Now send STDERR to STDOUT:

$ ./out.py 2>&1 | grep zzzzzzzz
         port 80 namevhost zzzzzzzz.com (/home/httpd/zzzzzzz.com/conf/kloxo.zzzzzzzz.com:4)
         port 80 namevhost expenses.zzzzzzzz.com (/home/httpd/expenses.zzzzzzz.com/conf/kloxo.expenses.zzzzzzz.com:4)