I'm a rookie in Ubuntu and recently trying to learn Ubuntu. Now I encountered a very serious issue that for some reasons I need to update the configuration file like httpd.conf, hosts.deny and others and in order to make these changes to take effect, every time I rebooted the Ubutn server machine which is totally not allowed and produces serious impacts. I know Ubuntu has many kinds of configuation files, including ones from system itself, or user's applications, etc, so the questions I'm intending to ask are:
1, can anybody summarize a list of types of configuation files in Ubuntu?
2, what's the convenient way for making these changes to take effect without rebooting the machine?
Thanks in advance.