azilber · September 5, 2021 08:04 · Jul 28, 2014 · Jun 29, 2014 · Jun 29, 2014 · Jun 29, 2014
diff --git a/ipassign b/ipassign
@@ -45,7 +45,6 @@ valid_ip() {
 
 check_ec2metadata() {
   ec2-metadata >/dev/null 2>&1
-
   if [ $? -eq 0 ]
   then
     # Amazon Linux ec2-metadata command found
@@ -54,16 +53,26 @@ check_ec2metadata() {
   else
     # Checking ec2metadata command
     ec2metadata >/dev/null 2>&1
-
     if [ $? -eq 0 ]
     then
       # ec2metadata command found
       EC2INSTANCE=`ec2metadata --instance-id`
       EC2PUBLICIP=`ec2metadata --public-ipv4`
     else
-      # ec2metadata/ec2-metadata command not found
-      LOG="ERROR: No ec2metadata or ec2-metadata command found"; write_log
-      exit 127
+      # No ec2metadata/ec2-metadata command found. Trying to obtain using curl requests directly
+      IP_AVAILABLE=`curl --connect-timeout 5 -i http://169.254.169.254/latest/meta-data/public-ipv4 2>/dev/null | grep "200 OK" | wc -l`
+      IS_AVAILABLE=`curl --connect-timeout 5 -i http://169.254.169.254/latest/meta-data/instance-id 2>/dev/null | grep "200 OK" | wc -l`
+      (( INFO=${IP_AVAILABLE}+${IS_AVAILABLE} ))
+
+      if [ ${INFO} -eq 2 ]
+      then
+        EC2INSTANCE=`curl --connect-timeout 5 http://169.254.169.254/latest/meta-data/instance-id 2>/dev/null`
+        EC2PUBLICIP=`curl --connect-timeout 5 http://169.254.169.254/latest/meta-data/public-ipv4 2>/dev/null`
+      else
+        # ec2metadata/ec2-metadata command not found and unable to obtain metadata info using curl
+        LOG="ERROR: Unable to obtain metadata information using ec2metadata/ec2-metadata command or curl requests"; write_log
+        exit 127
+      fi
     fi
   fi
 }

diff --git a/ipassign b/ipassign
@@ -1,6 +1,6 @@
 #!/bin/bash
 # chkconfig: 2345 99 10
-# description: Auto assigns free EIP
+# description: Set Public IP from ElasticIP pool during instance startup
 # processname: ipassign
 # Provides:             ipassign
 # Required-Start:       

diff --git a/ipassign b/ipassign
@@ -150,7 +150,7 @@ stop() {
   exit 6
 }
 
-status () {
+status() {
   check_ec2metadata
   valid_ip
 

diff --git a/ipassign b/ipassign
@@ -54,6 +54,7 @@ check_ec2metadata() {
   else
     # Checking ec2metadata command
     ec2metadata >/dev/null 2>&1
+
     if [ $? -eq 0 ]
     then
       # ec2metadata command found

diff --git a/ipassign b/ipassign
@@ -45,6 +45,7 @@ valid_ip() {
 
 check_ec2metadata() {
   ec2-metadata >/dev/null 2>&1
+
   if [ $? -eq 0 ]
   then
     # Amazon Linux ec2-metadata command found

diff --git a/ipassign b/ipassign
@@ -9,6 +9,7 @@
 # Default-Stop:         
 # Short-Description:    Set Public IP from ElasticIP pool during instance startup
 #
+#
 # Developed by: Javier Sianes - [email protected]
 #
 

diff --git a/ipassign b/ipassign
@@ -7,7 +7,10 @@
 # Required-Stop:        
 # Default-Start:        2 3 4 5
 # Default-Stop:         
-# Short-Description:    Set Public IP from ElasticIP pool during instance start-up
+# Short-Description:    Set Public IP from ElasticIP pool during instance startup
+#
+# Developed by: Javier Sianes - [email protected]
+#
 
 OUTPUT="text"
 REGION="eu-west-1"

diff --git a/ipassign b/ipassign
@@ -105,7 +105,7 @@ start() {
     if [ "${IP}" = "" ]
     then
       # Public IP on Elastic pool unavailable
-      LOG="ERROR: Public IP from Elastic pool in ${REGION} region unavailable"; write_log
+      LOG="ERROR: Free Public IP inside Elastic pool in ${REGION} region unavailable"; write_log
       exit 5
     else
       # Attach Public IP from Elastic pool

diff --git a/ipassign b/ipassign
@@ -81,8 +81,8 @@ start() {
 
   if [ ${VALIDIP} -eq 0 ]
   then
-    # No Public IP available. Can't use AWS CLI
-    LOG="ERROR: There is no Public IP address assigned to ${EC2INSTANCE} instance. Unable to use AWS CLI."; write_log
+    # No Public IP available. So, AWS CLI unavailable
+    LOG="ERROR: There is no Public IP address attached to ${EC2INSTANCE} instance. Unable to use AWS CLI."; write_log
     exit 3
   fi
 

diff --git a/ipassign b/ipassign
@@ -7,7 +7,7 @@
 # Required-Stop:        
 # Default-Start:        2 3 4 5
 # Default-Stop:         
-# Short-Description:    Set Public IP from ElasticIP pool during start-up
+# Short-Description:    Set Public IP from ElasticIP pool during instance start-up
 
 OUTPUT="text"
 REGION="eu-west-1"

diff --git a/ipassign b/ipassign
@@ -159,10 +159,10 @@ status () {
 
   if [ ${IPPRESENTINPOOL} -eq 1 ]
   then
-    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance belongs ElasticIP pool"
+    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance in ${REGION} region belongs to ElasticIP pool"
     exit 0
   else
-    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance is a generic public IP NOT present in ElasticIP pool"
+    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance in ${REGION} region is a generic public IP NOT present in ElasticIP pool"
     exit 2
   fi
 }

diff --git a/ipassign b/ipassign
@@ -55,7 +55,7 @@ check_ec2metadata() {
       EC2INSTANCE=`ec2metadata --instance-id`
       EC2PUBLICIP=`ec2metadata --public-ipv4`
     else
-      # No ec2metadata command found
+      # ec2metadata/ec2-metadata command not found
       LOG="ERROR: No ec2metadata or ec2-metadata command found"; write_log
       exit 127
     fi
@@ -67,46 +67,45 @@ check_awscli() {
 
   if [ $? -ne 0 ]
   then
-    # Incorrect instance role or no valid AWS CLI configuration found
-    LOG="ERROR: AWS CLI commands not available. Check AWS CLI installation or configuration"; write_log
+    # Incorrect instance role or invalid AWS CLI configuration
+    LOG="ERROR: AWS CLI command not available. Check instance role or AWS CLI installation/configuration"; write_log
     exit 128
   fi
 }
 
 start() {
-  # EC2 metadata: public IP and Instance ID
   check_ec2metadata
 
-  # Checking if any Public IP is assigned
+  # Check Public IP
   valid_ip
 
   if [ ${VALIDIP} -eq 0 ]
   then
-    # No Public IP available. Can't execute AWS CLI command
-    LOG="ERROR: There is no Public IP address assigned. Can't run AWS CLI commands"; write_log
+    # No Public IP available. Can't use AWS CLI
+    LOG="ERROR: There is no Public IP address assigned to ${EC2INSTANCE} instance. Unable to use AWS CLI."; write_log
     exit 3
   fi
 
-  # Check if AWS CLI commands are available
+  # Check if AWS CLI is available
   check_awscli
 
-  # Checking if instance has a public IP from Elastic pool assigned
+  # Check if instance has a public IP from Elastic pool assigned
   PUBLICIPASSIGNED=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | wc -l`
 
   if [ ${PUBLICIPASSIGNED} -gt 0 ]
   then
-    # Instance has at least one Pulic IP associated from Elastic pool
+    # Instance has (at least) one Pulic IP associated from Elastic pool
     IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | head -1 | awk '{ print $NF; }'`
-    LOG="Instance ${EC2INSTANCE} has a Public IP address from Elastic pool in ${REGION} region (${IP})"; write_log
+    LOG="Instance ${EC2INSTANCE} has (at least) one Public IP address from Elastic pool in ${REGION} region (${IP})"; write_log
     exit 4
   else
     # Get IP address from Elastic pool
     IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep -v 'i-' | head -1 | awk '{ print $NF; }'`
 
     if [ "${IP}" = "" ]
     then
-      # No unassigned Public IP on pool
-      LOG="ERROR: No free Public IP from Elastic pool in ${REGION} region available"; write_log
+      # Public IP on Elastic pool unavailable
+      LOG="ERROR: Public IP from Elastic pool in ${REGION} region unavailable"; write_log
       exit 5
     else
       # Attach Public IP from Elastic pool
@@ -116,9 +115,9 @@ start() {
 
       if [ ${EXITCODE} -eq 0 ]
       then
-        LOG="${IP} Public IP from pool assigned to ${EC2INSTANCE} instance"; write_log
+        LOG="${IP} Public IP from Elastic pool assigned to ${EC2INSTANCE} instance"; write_log
       else
-        LOG="ERROR: (${EXITCODE}) Unable to associate ${IP} Public IP from Elastic pool to ${EC2INSTANCE} instance"; write_log
+        LOG="ERROR: (${EXITCODE}) Unable to attach ${IP} Public IP from Elastic pool to ${EC2INSTANCE} instance"; write_log
         BOOL=1
       fi
 
@@ -130,9 +129,9 @@ start() {
 
         if [ ${EXITCODE} -eq 0 ] || [ ${EXITCODE} -eq 255 ]
         then
-          LOG="Default public IP ${EC2PUBLICIP} not from pool disassociated in ${EC2INSTANCE} instance"; write_log
+          LOG="Default public IP ${EC2PUBLICIP} outside Elastic pool detached from ${EC2INSTANCE} instance"; write_log
         else
-          LOG="ERROR: (${EXITCODE}) Unable to disassociate default public IP ${EC2PUBLICIP} in ${EC2INSTANCE} instance"; write_log
+          LOG="ERROR: (${EXITCODE}) Unable to detach default public IP ${EC2PUBLICIP} from ${EC2INSTANCE} instance"; write_log
           BOOL=2
         fi
       fi
@@ -151,7 +150,7 @@ status () {
 
   if [ ${VALIDIP} -eq 0 ]
   then
-    echo "No Public IP address assigned to ${EC2INSTANCE} instance."
+    echo "No Public IP address attached to ${EC2INSTANCE} instance."
     exit 1
   fi
 
@@ -160,10 +159,10 @@ status () {
 
   if [ ${IPPRESENTINPOOL} -eq 1 ]
   then
-    echo "Public IP ${EC2PUBLICIP} assigned to ${EC2INSTANCE} instance is part of the ElasticIP pool"
+    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance belongs ElasticIP pool"
     exit 0
   else
-    echo "Public IP ${EC2PUBLICIP} assigned to ${EC2INSTANCE} instance is a generic public IP NOT present in ElasticIP pool"
+    echo "Public IP ${EC2PUBLICIP} attached to ${EC2INSTANCE} instance is a generic public IP NOT present in ElasticIP pool"
     exit 2
   fi
 }

diff --git a/ipassign b/ipassign
@@ -23,6 +23,11 @@ usage() {
   exit 255
 }
 
+write_log() {
+  timestamp
+  echo "${TIMESTAMP} - ${LOG}" >> ${IPLOGFILE}
+}
+
 valid_ip() {
   RX='([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])'
 
@@ -42,17 +47,16 @@ check_ec2metadata() {
     EC2INSTANCE=`ec2-metadata -i | awk '{ print $NF; }'`
     EC2PUBLICIP=`ec2-metadata -v | awk '{ print $NF; }'`
   else
-    # Checking for ec2metadata command
+    # Checking ec2metadata command
     ec2metadata >/dev/null 2>&1
     if [ $? -eq 0 ]
     then
       # ec2metadata command found
       EC2INSTANCE=`ec2metadata --instance-id`
       EC2PUBLICIP=`ec2metadata --public-ipv4`
     else
-      # Error, no ec2metadata command found
-      timestamp
-      echo "${TIMESTAMP} - ERROR: No ec2metadata or ec2-metadata command found." >> ${IPLOGFILE}
+      # No ec2metadata command found
+      LOG="ERROR: No ec2metadata or ec2-metadata command found"; write_log
       exit 127
     fi
   fi
@@ -63,15 +67,14 @@ check_awscli() {
 
   if [ $? -ne 0 ]
   then
-    # Error, no valid aws cli configuration
-    timestamp
-    echo "${TIMESTAMP} - ERROR: AWS CLI commands not available. Check AWS CLI installation or configuration." >> ${IPLOGFILE}
+    # Incorrect instance role or no valid AWS CLI configuration found
+    LOG="ERROR: AWS CLI commands not available. Check AWS CLI installation or configuration"; write_log
     exit 128
   fi
 }
 
 start() {
-  # Obtaining EC2 metadata: public IP and Instance ID
+  # EC2 metadata: public IP and Instance ID
   check_ec2metadata
 
   # Checking if any Public IP is assigned
@@ -80,63 +83,56 @@ start() {
   if [ ${VALIDIP} -eq 0 ]
   then
     # No Public IP available. Can't execute AWS CLI command
-    timestamp
-    echo "${TIMESTAMP} - ERROR: There is no Public IP address assigned. Can't run AWS CLI commands" >> ${IPLOGFILE}
+    LOG="ERROR: There is no Public IP address assigned. Can't run AWS CLI commands"; write_log
     exit 3
   fi
 
   # Check if AWS CLI commands are available
   check_awscli
 
-  # Check if instance has a public IP from Elasticip pool assigned
+  # Checking if instance has a public IP from Elastic pool assigned
   PUBLICIPASSIGNED=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | wc -l`
 
   if [ ${PUBLICIPASSIGNED} -gt 0 ]
   then
-    # Instance has at least one Pulic IP associated from pool. So, nothing to do
+    # Instance has at least one Pulic IP associated from Elastic pool
     IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | head -1 | awk '{ print $NF; }'`
-    timestamp
-    echo "${TIMESTAMP} - Instance ${EC2INSTANCE} has a Public IP ${IP} address from pool associated. So, nothing required" >> ${IPLOGFILE}
+    LOG="Instance ${EC2INSTANCE} has a Public IP address from Elastic pool in ${REGION} region (${IP})"; write_log
     exit 4
   else
-    # Get a IP address from pool
+    # Get IP address from Elastic pool
     IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep -v 'i-' | head -1 | awk '{ print $NF; }'`
 
     if [ "${IP}" = "" ]
     then
       # No unassigned Public IP on pool
-      timestamp
-      echo "${TIMESTAMP} - ERROR: can't find a free Public IP in the pool" >> ${IPLOGFILE}
+      LOG="ERROR: No free Public IP from Elastic pool in ${REGION} region available"; write_log
       exit 5
     else
-      # Allocate Public IP from pool
+      # Attach Public IP from Elastic pool
       BOOL=0
       aws ec2 associate-address --output ${OUTPUT} --region ${REGION} --instance-id ${EC2INSTANCE} --public-ip ${IP} >/dev/null 2>&1
       EXITCODE=$?
 
       if [ ${EXITCODE} -eq 0 ]
       then
-        timestamp
-        echo "${TIMESTAMP} - ${IP} Public IP from pool assigned to ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+        LOG="${IP} Public IP from pool assigned to ${EC2INSTANCE} instance"; write_log
       else
-        timestamp
-        echo "${TIMESTAMP} - ERROR: (${EXITCODE}) Unable to associate ${IP} Public IP from pool to ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+        LOG="ERROR: (${EXITCODE}) Unable to associate ${IP} Public IP from Elastic pool to ${EC2INSTANCE} instance"; write_log
         BOOL=1
       fi
 
       if [ ${BOOL} -eq 0 ]
       then
-        # Disassociating default Public IP
+        # Detaching default Public IP
         aws ec2 disassociate-address --output ${OUTPUT} --region ${REGION} --instance-id ${EC2INSTANCE} --public-ip ${EC2PUBLICIP} >/dev/null 2>&1
         EXITCODE=$?
 
         if [ ${EXITCODE} -eq 0 ] || [ ${EXITCODE} -eq 255 ]
         then
-          timestamp
-          echo "${TIMESTAMP} - Default public IP ${EC2PUBLICIP} not from pool disassociated in ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+          LOG="Default public IP ${EC2PUBLICIP} not from pool disassociated in ${EC2INSTANCE} instance"; write_log
         else
-          timestamp
-          echo "${TIMESTAMP} - ERROR: (${EXITCODE}) Unable to disassociate default public IP ${EC2PUBLICIP} in ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+          LOG="ERROR: (${EXITCODE}) Unable to disassociate default public IP ${EC2PUBLICIP} in ${EC2INSTANCE} instance"; write_log
           BOOL=2
         fi
       fi

diff --git a/ipassign b/ipassign
@@ -0,0 +1,188 @@
+#!/bin/bash
+# chkconfig: 2345 99 10
+# description: Auto assigns free EIP
+# processname: ipassign
+# Provides:             ipassign
+# Required-Start:       
+# Required-Stop:        
+# Default-Start:        2 3 4 5
+# Default-Stop:         
+# Short-Description:    Set Public IP from ElasticIP pool during start-up
+
+OUTPUT="text"
+REGION="eu-west-1"
+IPLOGFILE="/var/log/ipassign.log"
+export PATH=/usr/share/pear:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/opt/aws/bin:/home/ec2-user/bin
+
+timestamp() {
+  TIMESTAMP=`date -u +"%Y-%m-%dT%H:%M:%S.000Z"`
+}
+
+usage() {
+  echo "$0 {start|stop|status}"
+  exit 255
+}
+
+valid_ip() {
+  RX='([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])'
+
+  if [[ ${EC2PUBLICIP} =~ ^${RX}\.${RX}\.${RX}\.${RX}$ ]]
+  then
+    VALIDIP=1
+  else
+    VALIDIP=0
+  fi
+}
+
+check_ec2metadata() {
+  ec2-metadata >/dev/null 2>&1
+  if [ $? -eq 0 ]
+  then
+    # Amazon Linux ec2-metadata command found
+    EC2INSTANCE=`ec2-metadata -i | awk '{ print $NF; }'`
+    EC2PUBLICIP=`ec2-metadata -v | awk '{ print $NF; }'`
+  else
+    # Checking for ec2metadata command
+    ec2metadata >/dev/null 2>&1
+    if [ $? -eq 0 ]
+    then
+      # ec2metadata command found
+      EC2INSTANCE=`ec2metadata --instance-id`
+      EC2PUBLICIP=`ec2metadata --public-ipv4`
+    else
+      # Error, no ec2metadata command found
+      timestamp
+      echo "${TIMESTAMP} - ERROR: No ec2metadata or ec2-metadata command found." >> ${IPLOGFILE}
+      exit 127
+    fi
+  fi
+}
+
+check_awscli() {
+  aws ec2 describe-addresses >/dev/null 2>&1
+
+  if [ $? -ne 0 ]
+  then
+    # Error, no valid aws cli configuration
+    timestamp
+    echo "${TIMESTAMP} - ERROR: AWS CLI commands not available. Check AWS CLI installation or configuration." >> ${IPLOGFILE}
+    exit 128
+  fi
+}
+
+start() {
+  # Obtaining EC2 metadata: public IP and Instance ID
+  check_ec2metadata
+
+  # Checking if any Public IP is assigned
+  valid_ip
+
+  if [ ${VALIDIP} -eq 0 ]
+  then
+    # No Public IP available. Can't execute AWS CLI command
+    timestamp
+    echo "${TIMESTAMP} - ERROR: There is no Public IP address assigned. Can't run AWS CLI commands" >> ${IPLOGFILE}
+    exit 3
+  fi
+
+  # Check if AWS CLI commands are available
+  check_awscli
+
+  # Check if instance has a public IP from Elasticip pool assigned
+  PUBLICIPASSIGNED=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | wc -l`
+
+  if [ ${PUBLICIPASSIGNED} -gt 0 ]
+  then
+    # Instance has at least one Pulic IP associated from pool. So, nothing to do
+    IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep ${EC2INSTANCE} | head -1 | awk '{ print $NF; }'`
+    timestamp
+    echo "${TIMESTAMP} - Instance ${EC2INSTANCE} has a Public IP ${IP} address from pool associated. So, nothing required" >> ${IPLOGFILE}
+    exit 4
+  else
+    # Get a IP address from pool
+    IP=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep -v 'i-' | head -1 | awk '{ print $NF; }'`
+
+    if [ "${IP}" = "" ]
+    then
+      # No unassigned Public IP on pool
+      timestamp
+      echo "${TIMESTAMP} - ERROR: can't find a free Public IP in the pool" >> ${IPLOGFILE}
+      exit 5
+    else
+      # Allocate Public IP from pool
+      BOOL=0
+      aws ec2 associate-address --output ${OUTPUT} --region ${REGION} --instance-id ${EC2INSTANCE} --public-ip ${IP} >/dev/null 2>&1
+      EXITCODE=$?
+
+      if [ ${EXITCODE} -eq 0 ]
+      then
+        timestamp
+        echo "${TIMESTAMP} - ${IP} Public IP from pool assigned to ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+      else
+        timestamp
+        echo "${TIMESTAMP} - ERROR: (${EXITCODE}) Unable to associate ${IP} Public IP from pool to ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+        BOOL=1
+      fi
+
+      if [ ${BOOL} -eq 0 ]
+      then
+        # Disassociating default Public IP
+        aws ec2 disassociate-address --output ${OUTPUT} --region ${REGION} --instance-id ${EC2INSTANCE} --public-ip ${EC2PUBLICIP} >/dev/null 2>&1
+        EXITCODE=$?
+
+        if [ ${EXITCODE} -eq 0 ] || [ ${EXITCODE} -eq 255 ]
+        then
+          timestamp
+          echo "${TIMESTAMP} - Default public IP ${EC2PUBLICIP} not from pool disassociated in ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+        else
+          timestamp
+          echo "${TIMESTAMP} - ERROR: (${EXITCODE}) Unable to disassociate default public IP ${EC2PUBLICIP} in ${EC2INSTANCE} instance" >> ${IPLOGFILE}
+          BOOL=2
+        fi
+      fi
+      exit ${BOOL}
+    fi
+  fi
+}
+
+stop() {
+  exit 6
+}
+
+status () {
+  check_ec2metadata
+  valid_ip
+
+  if [ ${VALIDIP} -eq 0 ]
+  then
+    echo "No Public IP address assigned to ${EC2INSTANCE} instance."
+    exit 1
+  fi
+
+  check_awscli
+  IPPRESENTINPOOL=`aws ec2 describe-addresses --output ${OUTPUT} --region ${REGION} | grep "${EC2INSTANCE}" | grep ${EC2PUBLICIP} | wc -l`
+
+  if [ ${IPPRESENTINPOOL} -eq 1 ]
+  then
+    echo "Public IP ${EC2PUBLICIP} assigned to ${EC2INSTANCE} instance is part of the ElasticIP pool"
+    exit 0
+  else
+    echo "Public IP ${EC2PUBLICIP} assigned to ${EC2INSTANCE} instance is a generic public IP NOT present in ElasticIP pool"
+    exit 2
+  fi
+}
+
+case "$1" in
+  start)
+        start
+        ;;
+  stop)
+        stop
+        ;;
+  status)
+        status
+        ;;
+  *)
+        usage
+        ;;
+esac