The Planet Forums > HOWTO: virtualcron for CentOS 4.x / Ensim 4.1

Full Version: HOWTO: virtualcron for CentOS 4.x / Ensim 4.1

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mta

Mar 30 2006, 03:24 PM

Because of issues with pam, setting up 'virtual cron' daemons in CentOS 4.2/Ensim 4.1 is not as simple as it was under FC1. Since we will soon be migrating to CentOS I took some time to find a solution using GNU mcron for the 'virtual cron' daemon. There are divers ways that this could be setup, but this is how I did it.

First, I created a mcron rpm. Nothing fancy, here's the spec file; modify to your liking:

CODE

Summary: Vixie Cron Replacement

Name: mcron

Version: 1.0.2

Release: 1.int

Source0: %{name}-%{version}.tar.gz

Patch0: %{name}-%{version}.patch

License: GPL

Group: Applications/System

BuildRoot: %{_builddir}/%{name}-root

%description

The GNU package mcron (Mellor's cron) is a 100% compatible replacement for Vixie cron. It is written in pure Guile, and allows configuration files to be written in scheme (as well as Vixie's original format) for infinite flexibility in specifying when jobs should be run. Mcron was written by Dale Mellor.

BuildRequires: guile-devel

Requires: guile

%prep

%setup -q

%patch0 -p1 -b .buildroot

%build

./configure --prefix=/usr/local --sysconfdir=/etc --localstatedir=/var --infodir=/usr/local/share/info --mandir=/usr/local/share/man

make

%install

rm -rf $RPM_BUILD_ROOT

make DESTDIR=$RPM_BUILD_ROOT install

%clean

rm -rf $RPM_BUILD_ROOT

%files

%defattr(-,root,root)

%dir /usr

%dir /usr/share

%dir /usr/share/guile

%dir /usr/share/guile/site

%dir /usr/share/guile/site/mcron

%dir /usr/local

%dir /usr/local/share

%dir /usr/local/share/mcron

%dir /usr/local/share/info

%dir /usr/local/bin

%dir /var

%dir /var/run

%dir /var/cron

/usr/local/share/mcron/vixie-specification.scm

/usr/local/share/mcron/config.scm

/usr/local/share/mcron/job-specifier.scm

/usr/local/share/mcron/redirect.scm

/usr/local/share/mcron/core.scm /usr/local/share/mcron/vixie-time.scm

/usr/local/share/mcron/environment.scm

/usr/local/share/info/dir

/usr/local/share/info/mcron.info

/usr/local/bin/mcron

/usr/local/bin/crontab

/usr/local/bin/cron

mcron-1.0.2.patch ( for makefile.in )

CODE

--- mcron-1.0.2/makefile.in 2006-01-02 10:09:32.000000000 -0500

+++ mcron-1.0.2/makefile.in 2006-03-29 16:38:08.000000000 -0500

@@ -775,10 +775,10 @@

$(INSTALL) --mode='u=rwx' mcron$(EXEEXT) $(fpp)cron$(EXEEXT); rm -f $(fpp)crontab$(EXEEXT) > /dev/null 2>&1;

$(INSTALL) --mode='u=rwxs,og=rx' mcron$(EXEEXT) $(fpp)crontab$(EXEEXT);

- ./mkinstalldirs -m 'u=rwx' /var/cron;

- ./mkinstalldirs -m 'u=rwx,og=rx' /var/run;

- ./mkinstalldirs -m 'u=rwx,og=rx' @GUILE_SITE@;

- ./mkinstalldirs -m 'u=rwx,og=rx' @GUILE_SITE@/mcron;

+ $(install_sh) -d -m 'u=rwx' $(DESTDIR)/var/cron;

+ $(install_sh) -d -m 'u=rwx,og=rx' $(DESTDIR)/var/run;

+ $(install_sh) -d -m 'u=rwx,og=rx' $(DESTDIR)@GUILE_SITE@;

+ $(install_sh) -d -m 'u=rwx,og=rx' $(DESTDIR)@GUILE_SITE@/mcron;

else

echo "+++ WARNING: NON-ROOT INSTALL: ONLY mcron WILL BE INSTALLED, NOT ANY OF THE VIXIE REPLACEMENT PROGRAMS";

fi

Next, I created /etc/virtualhosting/filelists/siteinfo.custom.sh containing the following:

CODE

#!/bin/bash

/bin/cat

/bin/echo "N:S,rpm:guile"

/bin/echo "N:S,rpm:mcron"

I didn't want mcron's cron daemon running on sites that weren't going to be using it. The virtualcron script we had been using ( with anacron on FC1 ) determined whether or not to run the virtual site's cron daemon by whether or not /home/virtual/$site/fst/usr/sbin/crond existed or not. Since the daemon exists on all virtual sites in our method, our virtual cron script decides if it will run the daemon based on whether or not /home/virtual/$site/fst/var/cron/tabs exists. If tabs/ exists, it will start cron for that virtual site. I also chose to start the daemon with the --noetc option, so that /home/virtual/$site/etc/crontab will not be run by the system and the virtual site.

Here is the virtualcron init script ( I think originally by Guarav Sabharwal ), slightly modified by me for mcron.

CODE

#!/bin/sh

#

# virtualcron Start virtual cron daemons

#

# chkconfig: 345 99 99

# description: virtualcron for domains

RETVAL=0

# See how we were called.

case "$1" in

start)

echo "Starting virtualcron for ALL sites"

cd /home/virtual

for domain in *.*

do

[[ ! -d ./$domain ]] && continue

if [[ -x /home/virtual/$domain/usr/local/bin/cron ]] && [[ -d /home/virtual/$domain/var/cron/tabs ]];

then

$0 domain-start $domain

fi

done

;;

domain-start)

OK="echo -en 033[1;32m"

FAIL="echo -en 033[1;31m"

END="echo -en 033[0;39m"

domain=$2

site=$(awk '$1 == "'"$domain"'" {print $3;exit}'

/etc/virtualhosting/mappings/domainmap)

ison=$(ls -ald /home/virtual/* |

egrep "$site/fst"'$' | fgrep -v virtual/admin)

if [ "x$ison" = "x" ]

then

echo "$domain not active."

exit

fi

pid="$(egrep "r-xp.*virtual/$site/fst/usr/local/bin/cron"

/proc/*/maps 2>/dev/null | awk -F/ '{print $3}')"

if [ "x$pid" = "x" ]

then

/usr/sbin/chroot /home/virtual/$domain /usr/local/bin/cron --noetc

sleep 1

pid="$(egrep "r-xp.*virtual/$site/fst/usr/local/bin/cron"

/proc/*/maps 2>/dev/null | awk -F/ '{print $3}')"

else

status="previously started - $pid"

fi

output=$(kill -0 $pid 2>&1 | sed -e 's/.*kill://')

if [ "x$output" = "x" ]

then

color=$OK

if [ "$status" = "" ]

then

status="started - $pid"

fi

else

color=$FAIL

status=failed

fi

printf "%-40s " $domain

$color

echo -n "[$status] "

$END

echo "$output"

;;

stop)

echo "Stopping virtualcron for ALL sites"

cd /home/virtual

for domain in *.*

do

[[ ! -d ./$domain ]] && continue

$0 domain-stop $domain

done

;;

domain-stop)

OK="echo -en 033[1;32m"

FAIL="echo -en 033[1;31m"

END="echo -en 033[0;39m"

domain=$2

site=$(awk '$1 == "'"$domain"'" {print $3;exit}'

/etc/virtualhosting/mappings/domainmap)

pid="$(egrep "r-xp.*virtual/$site/fst/usr/local/bin/cron"

/proc/*/maps 2>/dev/null | awk -F/ '{print $3}')"

nopid=0

if [ "x$pid" = "x" ]

then

ison=$(ls -ald /home/virtual/* |

egrep "$site/fst"'$' | fgrep -v virtual/admin)

if [ "x$ison" = "x" ]

then

continue

else

nopid=1

status="previously stopped"

fi

fi

if [ $nopid = 0 ]

then

output=$(kill $pid 2>&1 | sed -e 's/.*kill://')

fi

if [ "x$output" = "x" ]

then

color=$FAIL

if [ "$status" = "" ]

then

status="stopped - $pid"

fi

else

color=$FAIL

status=failed

fi

printf "%-40s " $domain

$color

echo -n "[$status] "

$END

echo "$output"

;;

status)

UP="echo -en 033[1;32m"

DOWN="echo -en 033[1;31m"

END="echo -en 033[0;39m"

cd /home/virtual

for site in site*

do

domain=$(awk '$3 == "'"$site"'" {print $1;exit}'

/etc/virtualhosting/mappings/domainmap)

base="$(egrep "r-xp.*virtual/$site/fst/usr/local/bin/cron"

/proc/*/maps 2>/dev/null |

sed -e 's/^.* //' -e 's#/fst.*##')"

if [ "x$base" = "x" ]

then

ison=$(ls -ald /home/virtual/* |

egrep "$site/fst"'$' | fgrep -v virtual/admin)

if [ "x$ison" = "x" ]

then

continue

else

status="stopped"

color="$DOWN"

fi

else

pid="$(egrep "r-xp.*virtual/$site/fst/usr/local/bin/cron"

/proc/*/maps 2>/dev/null | awk -F/ '{print $3}')"

status="running - $pid"

color="$UP"

fi

printf "%-40s " $domain

$color

echo -n "[$status]"

$END

echo

done

;;

restart|reload)

$0 stop

$0 start

RETVAL=$?

;;

*)

echo "Usage: virtualcron {start|stop|domain-start|domain-stop|restart|status}"

exit 1

esac

exit $RETVAL

Adding new jobs:
chroot /home/virtual/$site/fst
su - admin
crontab -e

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