root@foo apache $ bin/apachectl graceful in VS .NET

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A graceful restart is generally preferred, as it avoids disrupting users You can use the /usr/apache/ bin/apachectl tool to do this, as shown here:
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root@foo apache $ bin/apachectl graceful
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Following is the returned process listing:
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Owner PID PPID root10185 1 2 09:31:14 www-data 10230 10185 1 09:41:27 www-data 10233 10185 1 09:41:27 www-data 10231 10185 1 09:41:27 www-data 10232 10185 1 09:41:27 www-data 10229 10185 1 09:41:27 0:01 /usr/apache/bin/httpd 0:00 /usr/apache/bin/httpd 0:00 /usr/apache/bin/httpd 0:00 /usr/apache/bin/httpd 0:00 /usr/apache/bin/httpd 0:00 /usr/apache/bin/httpd
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The previous child processes have gone away, and the parent process has launched a new set of children Modules are called once to initialize themselves and then again for each configuration directive All of their configuration is built into memory at startup and never changed again Modules attach their configurations to a tree of directories and locations held in memory, mirroring the <Directory> and <Location> entries in the configuration file Modules are also called back as each child process starts and stops There are four command-line options to bin/httpd that are particularly useful when dealing with modules The first is -t, which asks Apache to check that the configuration is all right
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root@foo apache $ Syntax OK root@foo apache $ bin/httpd -t
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This will catch syntax errors and contradictions in the file The apachectl script runs this before trying to restart the Web server, and ensures that it will not shut down the server and be unable to restart it The second option, -l, will show a list of modules currently compiled into the server
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root@foo apache $ bin/httpd -l Compiled-in modules: http_corec mod_envc mod_log_configc mod_mimec mod_negotiationc mod_statusc mod_includec mod_autoindexc mod_dirc mod_cgic mod_asisc mod_imapc mod_actionsc mod_userdirc mod_aliasc mod_accessc mod_authc mod_soc mod_setenvifc root@foo apache $
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N OT E The -l argument shows only the compiled modules and not the dynamically loaded modules
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The -L option shows the configuration directives they define; the -h option shows a short summary of available command-line options
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There are a number of different log files ready when Apache starts, as well as ways to configure new log files for an individual Apache install Utilizing log files, which may seem daunting at first, will provide invaluable information to the log-savvy administrator, whenever anything goes wrong (or right) with an Apache install, configuration, and use
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/var/apache/logs/access_log
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Apache adds a line to this log file for every request it receives By default, entries are similar to the following:
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19216811 - - [05/May/2000:12:32:52 -0700] "GET / HTTP/10" 200 1622
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This is known as Common Log Format (CLF)
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The fields are as follows:
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host ident authuser date request status bytes
If no information exists, the log shows a hyphen (-) in its place
host
This is the IP address the request came from Apache can automatically do a reverse look-up on each IP and fill in the actual host name here To enable this, edit the httpdconf file and turn on the HostnameLookups directive Type:
HostnameLookups On
DNS look-ups tend to be very slow, so this feature should not be activated If actual host names must be tracked for traffic analysis purposes, do the DNS look-ups at log analysis time Most popular log analysis tools have an option to resolve IP addresses
ident
Apache can do an identd check (see RFC 1413) on the incoming HTTP connection An identd check is an attempt to determine the identity of a user of a particular TCP connection To turn on this feature, edit the httpdconf file, and add:
IdentityCheck On
IdentityCheck requires that the client machine run identd if it is to work
identd checks can be extremely slow, so do not use this feature on a busy Web server identd checks can also be faked, so the information should not be explicitly trusted
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authuser
If the requested document requires access authentication, then the authenticated user ID is placed in this field
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date
This field contains the date and time the request was initiated The format is as follows:
05/May/2000:12:08:19 -0700
request
The actual HTTP request that the client sent is enclosed in quotes
status
This field contains the three-digit HTTP status code returned to the client from Apache The most common codes are 200, 202, 301, 302, 400, 403, and 404