Script to automatically move RAC 11gR2 services back to preferred instances

#!/bin/bash
#
# GI callout script to catch INSTANCE up event from clusterware and relocate services to preferred instance
# Copy or symlink this script to $GRID_HOME/racg/usrco
# Tested on Oracle Linux 5.8 with 11.2.0.3 Oracle Grid Infrastructure and 11.2.0.2 & 11.2.0.3 Oracle Database Enterprise Edition
# 2012 Ilmar Kerm ilmar.kerm@gmail.com
#Modified for log location and tested on RHEL 6.4 with 11.2.0.3 Oracle Grid Infrastructure
# 2014 Hitesh G https://hiteshgondalia.wordpress.com/

FAN_LOGFILE=/home/oracle/log/rac_`hostname`.log
echo $* "reported="`date` >> $FAN_LOGFILE &

LOGFILE=/home/oracle/log.log
SCRIPTDIR=`dirname $0`

# Determine grid home
if [[ "${SCRIPTDIR:(-11)}" == "/racg/usrco" ]]; then
  CRS_HOME=""${SCRIPTDIR:0:$(( ${#SCRIPTDIR} - 11 ))}""
  export CRS_HOME
fi

# Only execute script for INSTANCE events
if [ "$1" != "INSTANCE" ]; then
  exit 0
fi

STATUS=""
DATABASE=""
INSTANCE=""

# Parse input arguments
args=("$@")
for arg in ${args[@]}; do
  if [[ "$arg" == *=* ]]; then
    KEY=${arg%=*}
    VALUE=${arg#*=}

    case "$KEY" in
      status)
        STATUS="$VALUE"
        ;;
      database)
        DATABASE="$VALUE"
        ;;
      instance)
        INSTANCE="$VALUE"
        ;;
    esac

  fi
done

# If database, status and instance values are not set, then exit
# status must be up
if [[ -z "$DATABASE" || -z "$INSTANCE" || "$STATUS" != "up" ]]; then
  exit 0
fi

echo "`date`" >> "$LOGFILE"
echo "[$DATABASE][`hostname`] Instance $INSTANCE up" >> "$LOGFILE"

#
# Read database software home directory from clusterware
#
DBCONFIG=`$CRS_HOME/bin/crsctl status res ora.$DATABASE.db -f | grep "ORACLE_HOME="`
if [ -z "$DBCONFIG" ]; then
  exit 0
fi
declare -r "$DBCONFIG"
echo "ORACLE_HOME=$ORACLE_HOME" >> "$LOGFILE"

# Array function
in_array() {
    local hay needle=$1
    shift
    for hay; do
        [[ $hay == $needle ]] && return 0
    done
    return 1
}

#
# Read information about services
#
for service in `$CRS_HOME/bin/crsctl status res | grep -E "ora.$DATABASE.(.+).svc" | sed -rne "s/NAME=ora.$DATABASE.(.+).svc/1/gip"`; do
  SERVICECONFIG=`$ORACLE_HOME/bin/srvctl config service -d $DATABASE -s $service`
  echo "Service $service" >> "$LOGFILE"
  if [[ `echo "$SERVICECONFIG" | grep "Service is enabled" | wc -l` -eq 1 ]]; then
    echo " enabled" >> "$LOGFILE"
    PREFERRED=( `echo "$SERVICECONFIG" | grep "Preferred instances:" | sed -rne "s/.*: ([a-zA-Z0-9]+)/1/p" | tr "," "n"` )
    #
    # Check if current instance is preferred for this service
    #
    if in_array "$INSTANCE" "${PREFERRED[@]}" ; then
      echo " preferred" >> "$LOGFILE"
      #
      # Check if service is already running on current instance
      #
      SRVSTATUS=`$ORACLE_HOME/bin/srvctl status service -d $DATABASE -s $service`
      if [[ "$SRVSTATUS" == *"is not running"* ]]; then
          #
          # if service is not running, then start it
          #
        echo " service stopped, starting" >> "$LOGFILE"
        $ORACLE_HOME/bin/srvctl start service -d "$DATABASE" -s "$service" >> "$LOGFILE"
      else
        #
        # Service is running, but is it running on preferred instance?
        #
        RUNNING=( `echo "$SRVSTATUS" | sed -rne "s/.* ([a-zA-Z0-9]+)/1/p" | tr "," "n"` )
        echo "${RUNNING[@]} = ${PREFERRED[@]}"
        if ! in_array "$INSTANCE" "${RUNNING[@]}" ; then
          echo " not running on preferred $INSTANCE" >> "$LOGFILE"
          #
          # Find the first non-preferred running instance
          #
          CURRENT=""
          for inst in "${RUNNING[@]}"; do
            if ! in_array "$inst" "${PREFERRED[@]}" ; then
              CURRENT="$inst"
              break
            fi
          done
          #
          # Relocate
          #
          if [[ -n "$CURRENT" ]]; then
            echo " relocate $CURRENT -> $INSTANCE" >> "$LOGFILE"
            $ORACLE_HOME/bin/srvctl relocate service -d "$DATABASE" -s "$service" -i "$CURRENT" -t "$INSTANCE" >> "$LOGFILE"
          fi
        else
          #
          # Service is already running on preferred instance, no need to do anything
          #
          echo " running on preferred $INSTANCE" >> "$LOGFILE"
        fi
      fi
    fi
  fi
done