Automated Install Script for memcached on RHEL5

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linux · memcached · RHEL5 · install · script

I created this script that will download memcached build,install and set it up to start up automatically on reboot. It also installs the init.d script to manage memcache so you can restart etc.

You can either copy and paste it into your shell prompt using a user that has install privileges (root,admin,etc) or you can copy into a .sh file and execute it.

The code for most of this was take from this blog post: http://www.vbseo.com/blogs/danny-bembibre/daemon-scripts-memcached-44/ it doesn’t seem to be around anymore so I put it here for anyone else looking for this very helpful info.

wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
tar -xvzf memcached-1.4.5.tar.gz
cd memcached-1.4.5
./configure
make
make test
make install

touch /etc/memcached.conf
cat << EOF >> /etc/memcached.conf
#Memory a user
-m 64
# default port
-p 11211
# user to run daemon nobody/apache/www-data
-u nobody
# only listen locally
-l 127.0.0.1
EOF

touch /etc/init.d/memcached
chmod +x /etc/init.d/memcached

cat << EOF >> /etc/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/functions
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/bin/memcached
DAEMONBOOTSTRAP=/usr/local/bin/start-memcached
DAEMONCONF=/etc/memcached.conf
NAME=memcached
DESC=memcached
PIDFILE=/var/run/$NAME.pid
[ -x $DAEMON ] || exit 0
[ -x $DAEMONBOOTSTRAP ] || exit 0
RETVAL=0
start() {
 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 "$1" in
 start)
  start
  ;;
 stop)
  stop
  ;;
 restart|reload)
  stop
  start
  RETVAL=$?
  ;;
 status)
  status $prog
  RETVAL=$?
  ;;
 *)
  echo $"Usage: $0 {start|stop|restart|status}"
  exit 1
esac
exit $RETVAL
EOF

touch /usr/local/bin/start-memcached
chmod +x /usr/local/bin/start-memcached

cat << EOF >> /usr/local/bin/start-memcached
#!/usr/bin/perl -w
# start-memcached
# 2003/2004 - Jay Bonci <jaybonci@debian.org>
# 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.pid
my $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 tip
my $fd_reopened = "/dev/null";
sub handle_logfile {
 my ($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] directives
my $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";
}
EOF

/etc/init.d/memcached restart
/sbin/chkconfig memcached on
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