November 27, 2011 3:10 pm
On occasion, I’ve wished there was a Linux feature that enabled me to run any command once the next time the system comes up (sort of similar to Windows’ RunOnce). The last time I needed this, I put together a simple init script to provide the functionality. I use this on Debian, but it should work on any UNIX-y OS with Sys-V style init. Create a file called /etc/init.d/runonce with the following content. Don’t forget to make it executable (chmod a+x).
#! /bin/sh
### BEGIN INIT INFO
# Provides: runonce
# Required-Start:
# Required-Stop:
# Should-Start:
# Default-Start: S
# Default-Stop:
# Short-Description: RunOnce
# Description: Runs scripts in /usr/local/etc/runonce.d
### END INIT INFO
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
RUNONCE_D=/usr/local/etc/runonce.d
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_start () {
mkdir -p $RUNONCE_D/ran > /dev/null 2>&1
for file in $RUNONCE_D/*
do
if [[ ! -f "$file" ]]
then
continue
fi
"$file"
mv "$file" "$RUNONCE_D/ran/"
logger -t runonce -p local3.info "$file"
done
}
case "$1" in
start|"")
do_start
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop)
# Do nothing
;;
*)
echo "Usage: runonce [start|stop]" >&2
exit 3
;;
esac
Then, you’ll need to symlink this script into the directories for the appropriate runlevels, which can be done easily on Debian with the following command:
update-rc.d runonce defaults
Finally, create a directory called /usr/local/etc/runonce.d. Now, you can simply put executable scripts or symlinks to utilities on the system into that directory. They’ll be run the next time you boot up, and then moved into the subdirectory /usr/local/etc/runonce.d/ran for posterity.
Posted by Martin Goldman
Categories: Sysadmin
Tags:
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This might be a old port, but I’d like to add the for CentOS, you’ll need to created the symlink with this command :
ln -s /etc/init.d/start_my_app /etc/rc.d/
By Daniel Berthiaume on November 22, 2017 at 4:14 pm