Elastic Network Interface Count

#!/usr/bin/env bash # This script will generate an HTML page to monitor the number of AWS VPC Elastic Network Interfaces currently in use and upload it to an S3 bucket website # Requires the AWS CLI, jq # Set Variables VPCID="YOUR-VPC-ID-HERE" # AWS CLI Profile for VPC ID PROFILE1="CLI-PROFILE-FOR-VPC" # AWS CLI Profile for S3 Bucket PROFILE2="CLI-PROFILE-FOR-S3-BUCKET" HTMLFILENAME="vpc-eni-monitor.html" S3BUCKETPATH="s3://YOUR-S3-BUCKET-HERE/" minENI=0 maxENI=0 # Functions # Check Command function check_command { type -P $1 &>/dev/null || fail "Unable to find $1, please install it and run this script again." } # Fail function fail(){ tput setaf 1; echo "Error: $*" && tput sgr0 exit 1 } # Horizontal Rule function HorizontalRule(){ echo "============================================================" } # Verify AWS CLI Credentials are setup # http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html if ! grep -q aws_access_key_id ~/.aws/credentials; then if ! grep -q aws_access_key_id ~/.aws/config; then fail "AWS config not found or CLI not installed. Please run \"aws configure\"." fi fi # Validate VPC ID function validateVPCID(){ if [ "$VPCID" = "YOUR-VPC-ID-HERE" ] || [ -z "$VPCID" ]; then # Count number of VPCs DESCRIBEVPCS=$(aws ec2 describe-vpcs --profile $PROFILE1 2>&1) if echo $DESCRIBEVPCS | egrep -q "Error|error|not"; then fail "$DESCRIBEVPCS" fi NUMVPCS=$(echo $DESCRIBEVPCS | jq '.Vpcs | length') if echo $NUMVPCS | egrep -q "Error|error|not|invalid"; then fail "$NUMVPCS" fi # If only one VPC, use that ID if [ "$NUMVPCS" -eq "1" ]; then VPCID=$(echo "$DESCRIBEVPCS" | jq '.Vpcs | .[] | .VpcId' | cut -d \" -f2) else FOUNDVPCS=$(aws ec2 describe-vpcs --profile $PROFILE1 2>&1 | jq '.Vpcs | .[] | .VpcId') if echo $FOUNDVPCS | egrep -q "Error|error|not|invalid"; then fail "$FOUNDVPCS" fi echo "Found VPCs:" $FOUNDVPCS echo read -r -p "Please specify VPC ID (ex. vpc-12345678): " VPCID if [ -z "$VPCID" ]; then fail "Must specify a valid VPC ID." fi fi fi CHECKVPC=$(aws ec2 describe-vpcs --vpc-ids "$VPCID" --profile $PROFILE1 2>&1) # Test for error if ! echo "$CHECKVPC" | grep -q "available"; then fail $CHECKVPC else HorizontalRule tput setaf 2; echo "VPC ID Validated" && tput sgr0 HorizontalRule fi } # Main function to generate the HTML and upload to S3 function generateHTML(){ while : do ENI=$(aws ec2 describe-network-interfaces --filters Name=vpc-id,Values=$VPCID --profile $PROFILE1 2>&1 | jq '.NetworkInterfaces | .[] | .NetworkInterfaceId' | wc -l | rev | cut -d ' ' -f1 | rev) if echo $ENI | grep -q error; then fail "$ENI" fi date echo ENIs: $ENI ( cat << 'EOP' Elastic Network Interface Count

ENIs: EOP ) > $HTMLFILENAME echo ' '$ENI >> $HTMLFILENAME ( cat << 'EOP'

Updated: EOP ) >> $HTMLFILENAME echo ' '$(date) >> $HTMLFILENAME if [ $minENI -eq "0" ]; then minENI=$ENI maxENI=$ENI fi if [ $ENI -eq $minENI ] && [ $ENI -eq $maxENI ]; then trend=flat fi if [ $ENI -lt $minENI ]; then minENI=$ENI trend=down fi if [ $ENI -gt $maxENI ]; then maxENI=$ENI trend=up fi echo minENIs: $minENI echo maxENIs: $maxENI echo trending: $trend echo '

'minENI = $minENI >> $HTMLFILENAME echo '
'maxENI = $maxENI >> $HTMLFILENAME echo '
' >> $HTMLFILENAME if [ "$trend" = "flat" ]; then echo '

---' >> $HTMLFILENAME fi if [ "$trend" = "up" ]; then echo '

/\' >> $HTMLFILENAME fi if [ "$trend" = "down" ]; then echo '

\/' >> $HTMLFILENAME fi ( cat << 'EOP'

EOP ) >> $HTMLFILENAME UPLOAD=$(aws s3 cp $HTMLFILENAME $S3BUCKETPATH --profile $PROFILE2 2>&1) if echo $UPLOAD | egrep -q "Error|error|not"; then fail "$UPLOAD" fi echo $UPLOAD if [ $ENI -lt "100" ]; then sleep=60 echo "sleeping $sleep seconds..." HorizontalRule echo sleep $sleep else sleep=3 echo "sleeping $sleep seconds..." HorizontalRule echo sleep $sleep fi done } # Check for required applications check_command "aws" check_command "jq" validateVPCID generateHTML