cvs commit: hints vixie-cron.txt

tushar at linuxfromscratch.org tushar at linuxfromscratch.org
Fri Oct 10 20:50:21 PDT 2003


tushar      03/10/10 21:50:21

  Added:       .        vixie-cron.txt
  Log:
  Added Hint: vixie-cron
  
  Revision  Changes    Path
  1.1                  hints/vixie-cron.txt
  
  Index: vixie-cron.txt
  ===================================================================
  AUTHOR:         Jim Gifford <lfs-hints at jg555.com>
  
  DATE: 		2003-10-09
  
  LICENSE: 	GNU Free Documentation License Version 1.2
  
  SYNOPSIS: 	Setup vixie-cron for LFS
  
  DESCRIPTION:	This will describe on how to setup vixie-cron for LFS.
  
  PREREQUISITES:	NONE
  
  HINT:
  
  Introduction to vixie-cron
  
  Download location for vixie-cron
  			ftp://ftp.roedu.net/pub/mirrors/gentoo.org/distfiles
  vixie-cron Version used		3.0.1
  
  cron is a standard UNIX program that runs user-specified programs at
  periodic scheduled times. vixie cron adds a number of features to the
  basic UNIX cron, including better security and more powerful configuration
  options. 
  
  ---
  Required Patches for vixie-cron
  
  In order to build vixie-cron, you will need to patch it. I have made patches
  available and posted to patches.linuxfromscratch.org. The patch order listed
  is critical to follow. At this point I have assumed that you have downloaded
  the vixie-cron-3.0.1.tar.bz2 file and uncompressed it.
  
  Patch Order
  
  Patch 1 - vixie-cron-3.0.1-redhat-mdk-1.patch
  Patch 2 - vixie-cron-3.0.1-security-1.patch
  Patch 3 - vixie-cron-3.0.1-makefile-1.patch
  Patch 4 - vixie-cron-3.0.1-variables-1.patch
  
  Optional - PAM
  
  Patch 5 - vixie-cron-3.0.1-pam-1.patch
  
  These patches can be retrieved from
  http://www.linuxfromscratch.org/patches/downloads/vixie-cron
  or
  ftp://ftp.jg555.com/pub/patches/vixie-cron
  
  All patches can be installed using patch -Np1 -i NAME
  
  ---
  Install vixie-cron by running the following commmands|
  
  make "gcc $CFLAGS" &&
  make install
  
  ----
  How-to use vixie-cron
  
  The cron daemon consults so-called crontabs for jobs to execute. These
  crontabs are ordinary textfiles, however you should always use the crontab
  tool to manipulate them.
  
  To have a look at your crontab execute crontab -l. If a crontab exists then
  it's contents is listed, otherwise "no crontab for <username>" will be
  displayed.
  
  To add or delete an entry in your crontab, use crontab -e. Which editor is
  used can be customized, but usually it's vi or whatever is in EDITOR variable.
  
  You add or delete entries by adding or deleting the appropriate line in the
  crontab (every entry takes exactly one line).
  
  Each line consists of six columns which are seperated by blanks. The sixth
  (rightmost) column tells cron which command/file to execute (always use the full
  path here), while the other five columns tell cron when to execute it.
  
  The columns (1 stands for the leftmost column, counting to the right) have the
  following meaning and take the values in brackets: 
  
  Minute (0 - 59)
  Hour (0 - 23)
  Day of month (1 - 31)
  Month (1 - 12)
  Day of the week (0 - 6, 0 representing sunday, 6 saturday) 
  
  In each of these five columns an asterisk ("*") stands for "every". 
  Example: "41 5 * * * /home/jim/backupmeup.sh" would mean that everyday at 5:41
  in the morning the script backmeup.sh in jim's home directory would be executed
  (assuming, of course, that the script is executable).
  
  If you want to specify a group of times, then concatenate the individual values,
  seperated by commas (Example: "00,15,30,45" - in the first column this would read
  as "every quarter of an hour on the quarter of the hour").
  
  If you want to specify a range of times, you can use the minus (Example: "1-5"
  in the fifth column would read as "every workday"). 
  
  ---
  /etc/cron.d
  
  You can also create text files with the same information listed above in /etc/cron.d.
  When you add a file to this directory, crond will sense the addition and add it to the
  execution schedule.
  
  ---
  /etc/crontab
  
  
  ---
  Make cron start on bootup
  
  Create the /etc/rc.d/init.d/cron by running:
  
  cat > /etc/rc.d/init.d/cron << "EOF"
  #!/bin/sh
  # Begin $rc_base/init.d/cron - cron loader
  
  # Based on sysklogd script from LFS-3.1 and earlier.
  # Rewritten by Gerard Beekmans  - gerard at linuxfromscratch.org
  
  source /etc/sysconfig/rc
  source $rc_functions
  
  case "$1" in
  	start)
  		echo "Starting Cron Scheduler..."
  		loadproc crond
  		;;
  	stop)
  		echo "Stopping Cron Schedular..."
  		killproc crond
  		rm -f /var/run/crond.pid
  		;;
  
  	restart)
  		$0 stop
  		sleep 1
  		$0 start
  		;;
  
  	status)
  		statusproc crond
  		;;
  
  	*)
  		echo "Usage: $0 {start|stop|restart|status}"
  		exit 1
  		;;
  esac
  
  # End $rc_base/init.d/cron
  EOF
  
  ---
  Make the script executable and create the appropriate symlinks by
  running:
  
  chmod 755 /etc/rc.d/init.d/cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc0.d/K08cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc2.d/S40cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc3.d/S40cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc4.d/S40cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc5.d/S40cron &&
  ln -s /etc/rc.d/init.d/cron /etc/rc.d/rc6.d/K08cron
  
  VERSION:        1.0
  
  CHANGELOG:     	1.0 Initial Version
  
   New Version of this document can be viewed from http://cvs.jg555.com/viewcvs.cgi/lfs-hints
  
  
  
  
  



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