Tham khảo tài liệu 'practical mod_perl-chapter 5:web server control, monitoring, upgrade, and maintenance', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Page 146 Thursday November 18 2004 12 36 PM CHAPTER 5 Web Server Control Monitoring Upgrade and Maintenance This chapter covers everything about administering a running mod_perl server. First we will explain techniques for starting restarting and shutting down the server. As with Perl there s more than one way to do it and each technique has different implications for the server itself and the code it runs. A few widely used techniques for operating a server are presented. You may choose to use one of the suggested techniques or develop your own. Later in the chapter we give instructions on upgrading and disabling scripts on a live server using a three-tier scheme and monitoring and maintaining a web server. Starting the Server in Multi-Process Mode To start Apache manually just run its executable. For example on our machine a mod_perl-enabled Apache executable is located at home httpd httpd_perl httpd_perl. So to start it we simply execute panic home httpd httpd_perl bin httpd_perl This executable accepts a number of optional arguments. To find out what they are without starting the server use the -h argument panic home httpd httpd_perl bin httpd_perl -h The most interesting arguments will be covered in the following sections. Any other arguments will be introduced as needed. Starting the Server in Single-Process Mode When developing new code it is often helpful to run the server in single-process mode. This is most often used to find bugs in code that seems to work fine when the server starts but refuses to work correctly after a few requests have been made. It also helps to uncover problems related to collisions between module names. 146 Page 147 Thursday November 18 2004 12 36 PM Running in single-process mode inhibits the server from automatically running in the background. This allows it to more easily be run under the control of a debugger. The -X switch is used to enable this mode panic home httpd httpd_perl bin httpd_perl -X With the
