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MinSpareThreads
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The MinSpareThreads directive specifies the minimum number of idle threads These spare threads are used to service requests and new spare threads are created to maintain the minimum spare thread pool size You can leave the default settings alone
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MaxSpareThreads
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The MaxSpareThreads directive specifies the maximum number of idle threads; leave the default as is In the default threaded mode, Apache kills child processes to control minimum and maximum thread count
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ThreadsPerChild
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This directive defines how many threads are created per child process
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If you are running Apache on a Windoiws system, set ThreadsPerChild to the maximum number of simultaneous requests that you want to handle, because on this platform there is only one child process, and it owns all the threads
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MaxRequestPerChild
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The final directive for the global environment is MaxRequestPerChild, which sets the number of requests a child process can serve before getting killed The default value of zero makes the child process serve requests forever I do not like to the default value because it enables Apache processes to slowly consume large amounts of memory when a faulty mod_perl script, or even a faulty third-party Apache module, leaks memory Thus, I prefer to set this to 30
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If you do not plan on running any third-party Apache modules or mod_perl scripts, you can keep the defaults or else set it to a reasonable number A setting of 30 ensures that the child process is killed after processing 30 requests Of course, a new child process is created as needed
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Configuring the main server
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The main server configuration applies to the default Web site Apache serves This is the site that will come up when you run Apache and use the server s IP address or host name on a Web browser
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The very first directive in this section is the Port directive, which sets the TCP port that Apache listens to for connections The default value of 80 is the standard HTTP port If you change this to another number, such as 8080, you can only access the server using a URL such as http://hostname:8080/ You must specify the port number in the URL if the server runs on a nonstandard port There are many reasons for running Apache on nonstandard ports, but the only good one I can think of is that you do not have permission to run Apache on the standard HTTP port As a nonroot user you can only run Apache on ports higher than 1024 After you have decided to run Apache by using a port, you need to tell Apache what its user and group names are
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User and Group directives
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The User and Group directives tell Apache the user (UID) and group (GID) names to use These two directives are very important for security reasons When the primary Web server process launches a child server process to fulfill a request, it changes the child s UID and GID according to the values set for these directives Refer to Figure 3-1 to see how the primary Web server process that listens for the connection runs as a root user process, and how the child processes run as different user/group processes If the child processes are run as root user processes, a potential security hole will be opened for attack by hackers Enabling the capability to interact with a root user process maximizes a potential breach of security in the system; hence, this is not recommended Rather, I highly recommend that you choose to run the child server processes as a very low-privileged user belonging to a very low-privileged group In most Unix systems, the user named nobody (usually UID = -1) and the group named nogroup (usually GID = -1) are low-privileged You should consult your /etc/group and /etc/passwd files to determine these settings If you plan to run the primary Web server as a nonroot (regular) user, it will not be able to change the UID and GID of child processes, because only root user processes can change the UID or GID of other processes Therefore, if you run your primary server as the user named ironsheik, then all child processes will have the same privileges as ironsheik Similarly, whatever group ID you have will also be the group ID for the child processes
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