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NAMENet::Server::PreFork - Net::Server personality SYNOPSISuse base qw(Net::Server::PreFork); sub process_request { #...code... } __PACKAGE__->run(); DESCRIPTIONPlease read the pod on Net::Server and Net::Server::PreForkSimple first. This module is a personality, or extension, or sub class, of the Net::Server::PreForkSimple class which is a sub class of Net::Server. See Net::Server::PreForkSimple. This personality binds to one or more ports and then forks "min_servers" child process. The server will make sure that at any given time there are "min_spare_servers" available to receive a client request, up to "max_servers". Each of these children will process up to "max_requests" client connections. This type is good for a heavily hit site, and should scale well for most applications. (Multi port accept is accomplished using flock to serialize the children). At this time, it does not appear that this module will pass tests on Win32 systems. Any ideas or patches for making the tests pass would be welcome. SAMPLE CODEPlease see the sample listed in Net::Server. COMMAND LINE ARGUMENTSIn addition to the command line arguments of the Net::Server base class and the Net::Server::PreForkSimple parent class, Net::Server::PreFork contains several other configurable parameters. You really should also see Net::Server::PreForkSimple. Key Value Default min_servers \d+ 5 min_spare_servers \d+ 2 max_spare_servers \d+ 10 max_servers \d+ 50 max_requests \d+ 1000 serialize (flock|semaphore |pipe|none) undef # serialize defaults to flock on multi_port or on Solaris lock_file "filename" File::Temp->new check_for_dead \d+ 30 check_for_waiting \d+ 10 max_dequeue \d+ undef check_for_dequeue \d+ undef child_communication 1 undef
CONFIGURATION FILE"Net::Server::PreFork" allows for the use of a configuration file to read in server parameters. The format of this conf file is simple key value pairs. Comments and white space are ignored. #-------------- file test.conf -------------- ### server information min_servers 20 max_servers 80 min_spare_servers 10 min_spare_servers 15 max_requests 1000 ### user and group to become user somebody group everybody ### logging ? log_file /var/log/server.log log_level 3 pid_file /tmp/server.pid ### access control allow .+\.(net|com) allow domain\.com deny a.+ ### background the process? background 1 ### ports to bind host 127.0.0.1 port localhost:20204 port 20205 ### reverse lookups ? # reverse_lookups on ### enable child communication ? # child_communication #-------------- file test.conf -------------- PROCESS FLOWProcess flow follows Net::Server until the loop phase. At this point "min_servers" are forked and wait for connections. When a child accepts a connection, finishes processing a client, or exits, it relays that information to the parent, which keeps track and makes sure there are enough children to fulfill "min_servers", "min_spare_servers", "max_spare_servers", and "max_servers". HOOKSThe PreFork server has the following hooks in addition to the hooks provided by PreForkSimple. See Net::Server::PreForkSimple.
HOT DEPLOYSince version 2.000, the PreFork server has accepted the TTIN and TTOU signals. When a TTIN is received, the min and max_servers are increased by 1. If a TTOU signal is received the min max_servers are decreased by 1. This allows for adjusting the number of handling processes without having to restart the server. BUGSTests don't seem to work on Win32. Any ideas or patches would be welcome. TO DOSee Net::Server AUTHORPaul T. Seamons paul@seamons.com THANKSSee Net::Server SEE ALSOPlease see also Net::Server::Fork, Net::Server::INET, Net::Server::PreForkSimple, Net::Server::MultiType, Net::Server::Single Net::Server::SIG Net::Server::Daemonize Net::Server::Proto
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