A simple example of a custom component managed by CRS

You can add custom components to CRS if you have a need. You basically need a program (perhaps as simple as a shell script) that accepts three command line arguments:

• start
• stop
• check

Below is an example of a shell script that you can register.

#!/bin/sh

if [ "$1" = "start" ]; then
  /home/oracle/test &
elif [ "$1" = "stop" ]; then
  PID=$(ps -ef | grep "/home/oracle/test" | grep -v grep | awk '{print $2}')
  if [ $PID ]; then
    kill -9 $PID
  fi
  exit 0
elif [ "$1" = "check" ]; then
  ps -ef | grep "/home/oracle/test" | grep -v grep  | grep -v check > /dev/null
  RETURN=$?
  exit $RETURN
fi

…with the program below called by the script above…

#!/bin/sh

while true; do
  echo 1
  sleep 5
done

You can then register the program by creating the following resource profile in a file named oclc.linux1.test.cap in the current directory…

NAME=oclc.linux1.test
TYPE=application
ACTION_SCRIPT=/home/oracle/test.sh
ACTIVE_PLACEMENT=0
AUTO_START=1
CHECK_INTERVAL=30
DESCRIPTION=test application
FAILOVER_DELAY=0
FAILURE_INTERVAL=0
FAILURE_THRESHOLD=0
HOSTING_MEMBERS=linux1
OPTIONAL_RESOURCES=
PLACEMENT=restricted
RESTART_ATTEMPTS=20
SCRIPT_TIMEOUT=30
START_TIMEOUT=0
STOP_TIMEOUT=0
UPTIME_THRESHOLD=7d

…which you finally register with the clusterware as follows…

crs_register oclc.linux1.test -dir $(pwd)