Sometimes you may not want to load all the modules in the Apache. For e.g. You may want to load ldap related modules to Apache, only when you are testing LDAP. This can be achieved as shown below.
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Use option -V (upper-case V), to display Apache version number and all the parameters that are used while building the Apache.
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Use option -t to validate whether there are any issues with a specific Apache configuration file. In the example shown below, it displays that there is a problem at line 148 in the httpd.conf.debug. mod_auth_basicso is missing a . (period) before the so.
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This is like an extended help for httpd, which will display all the httpd.conf directives and the places where they are valid. For a specific directive, it tells all the possible values and where it can be used inside the httpd.conf. This can be very helpful, when you want to quickly know about a particular Apache directive.
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Display the modules compiled inside Apache
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While you are debugging an issue, you can change the LogLevel of the Apache temporarily, without modifying the LogLevel directive in the httpd.conf as shown below using option -e. In this example, the LogLevel is set to debug.
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This is very helpful, when you are trying out different layout for your website and don’t want to modify the original files under the default DocumentRoot.
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Typically you’ll modify the original httpd.conf to try out different Apache directives. If something doesn’t work out, you’ll revert back the changes. Instead of playing around with the original httpd.conf, copy it to a new httpd.conf.debug and use this new httpd.conf.debug file with Apache for testing purpose as shown below using option -f.
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The magic SysRq key is a key combination in the Linux kernel which allows the user to perform various low level commands regardless of the system’s state.
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Using cron you can execute a shell-script or Linux commands at a specific time and date. For example a sysadmin can schedule a backup job that can run every day.
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