userdata-with-efs.sh

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#! /bin/bash
#Put your standard user data here
echo "userdata here for general purpose"

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#cloud-boothook
#Join the default ECS cluster
echo ECS_CLUSTER=default >> /etc/ecs/ecs.config
PATH=$PATH:/usr/local/bin
#Instance should be added to an security group that allows HTTP outbound
yum update -y
#Install jq, a JSON parser
yum -y install jq
#Install NFS client
if ! rpm -qa | grep -qw nfs-utils; then
    yum -y install nfs-utils
fi
if ! rpm -qa | grep -qw python27; then
	yum -y install python27
fi
#Install pip
yum -y install python27-pip
#Install awscli
pip install awscli
#Upgrade to the latest version of the awscli
pip install --upgrade awscli
#Add support for EFS to the CLI configuration
aws configure set preview.efs true
#Get region of EC2 from instance metadata
EC2_AVAIL_ZONE=`curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone`
EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"
#
# Need code here to read tag for EFS_MOUNT_NAME to replace "efs-docker" hardcode below
#Create mount point
mkdir /mnt/efs
#Get EFS FileSystemID attribute
#Instance needs to be added to a EC2 role that give the instance at least read access to EFS
EFS_FILE_SYSTEM_ID=`/usr/local/bin/aws efs describe-file-systems --region $EC2_REGION | jq '.FileSystems[]' | jq 'select(.Name=="efs-docker")' | jq -r '.FileSystemId'`
#Check to see if the variable is set. If not, then exit.
if [-z "$EFS_FILE_SYSTEM_ID"]; then
	echo "ERROR: variable not set" 1> /etc/efssetup.log
	exit
fi
#Instance needs to be a member of security group that allows 2049 inbound/outbound
#The security group that the instance belongs to has to be added to EFS file system configuration
#Create variables for source and target
DIR_SRC=$EC2_AVAIL_ZONE.$EFS_FILE_SYSTEM_ID.efs.$EC2_REGION.amazonaws.com
DIR_TGT=/mnt/efs 
#Mount EFS file system
mount -t nfs4 $DIR_SRC:/ $DIR_TGT
#Backup fstab
cp -p /etc/fstab /etc/fstab.back-$(date +%F)
#Append line to fstab
echo -e "$DIR_SRC:/ \t\t $DIR_TGT \t\t nfs \t\t defaults \t\t 0 \t\t 0" | tee -a /etc/fstab
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