memcached 使用 daemon 脚本

1. 编译 memcached (略)

 

2. 配置文件 /etc/memcached.conf

#Memory a user-m 512# default port-p 11211# user to run daemon nobody/apache/www-data-u daemon# only listen locally-l 10.1.1.27# threads-t 16

3. 启动进程脚本 /usr/local/bin/start-memcached

#!/usr/bin/perl -w# start-memcached# This script handles the parsing of the /etc/memcached.conf file# and was originally created for the Debian distribution.# Anyone may use this little script under the same terms as# memcached itself.use strict;if ($> != 0 and $< != 0) { print STDERR "Only root wants to run start-memcached.\n"; exit;}my $etcfile = shift || "/etc/memcached.conf";my $params = [];my $etchandle;# This script assumes that memcached is located at /usr/bin/memcached, and# that the pidfile is writable at /var/run/memcached.pidmy $memcached = "/usr/local/bin/memcached";my $pidfile = "/var/run/memcached.pid";# If we don't get a valid logfile parameter in the /etc/memcached.conf file,# we'll just throw away all of our in-daemon output. We need to re-tie it so# that non-bash shells will not hang on logout. Thanks to Michael Renner for# the tipmy $fd_reopened = "/dev/null";sub handle_logfile { my ($logfile) = @_; $fd_reopened = $logfile;}sub reopen_logfile { my ($logfile) = @_; open *STDERR, ">>$logfile"; open *STDOUT, ">>$logfile"; open *STDIN, ">>/dev/null"; $fd_reopened = $logfile;}# This is set up in place here to support other non -[a-z] directivesmy $conf_directives = { "logfile" => \&handle_logfile};if (open $etchandle, $etcfile) { foreach my $line (<$etchandle>) {  $line =~ s/\#.*//go;  $line = join ' ', split ' ', $line;  next unless $line;  next if $line =~ /^\-[dh]/o;  if ($line =~ /^[^\-]/o) {   my ($directive, $arg) = $line =~ /^(.*?)\s+(.*)/;   $conf_directives->{$directive}->($arg);   next;  }  push @$params, $line; }}unshift @$params, "-u root" unless (grep $_ eq '-u', @$params);$params = join " ", @$params;if (-e $pidfile) { open PIDHANDLE, "$pidfile"; my $localpid = <PIDHANDLE>; close PIDHANDLE; chomp $localpid; if (-d "/proc/$localpid") {  print STDERR "memcached is already running.\n";  exit; } else {  `rm -f $localpid`; }}my $pid = fork();if ($pid == 0) { reopen_logfile($fd_reopened); exec "$memcached $params"; exit(0);} elsif (open PIDHANDLE,">$pidfile") { print PIDHANDLE $pid; close PIDHANDLE;} else { print STDERR "Can't write pidfile to $pidfile.\n";}

 

4. 服务进程 /etc/rc.d/init.d/memcached

#!/bin/bash## memcached    This shell script takes care of starting and stopping#              standalone memcached.## chkconfig: - 80 12# description: memcached is a high-performance, distributed memory#              object caching system, generic in nature, but#              intended for use in speeding up dynamic web#              applications by alleviating database load.# processname: memcached# config: /etc/memcached.conf# Source function library.. /etc/rc.d/init.d/functionsPATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/binDAEMON=/usr/local/bin/memcachedDAEMONBOOTSTRAP=/usr/local/bin/start-memcachedDAEMONCONF=/etc/memcached.confNAME=memcachedDESC=memcachedPIDFILE=/var/run/$NAME.pid[ -x $DAEMON ] || exit 0[ -x $DAEMONBOOTSTRAP ] || exit 0RETVAL=0start() { echo -n $"Starting $DESC: " daemon $DAEMONBOOTSTRAP $DAEMONCONF RETVAL=$? [ $RETVAL -eq 0 ] && touch $PIDFILE echo return $RETVAL}stop() { echo -n $"Shutting down $DESC: " killproc $NAME RETVAL=$? echo [ $RETVAL -eq 0 ] && rm -f $PIDFILE return $RETVAL}# See how we were called.case "$1" instart) start ;;stop)  stop ;;restart|reload)  stop  start  RETVAL=$?  ;; status)  status $prog  RETVAL=$?  ;; *)  echo $"Usage: $0 {start|stop|restart|status}"  exit 1esacexit $RETVAL

 

5. 确保 start-memcached, memcached 可执行即可