AWS Cloudformation - mount to existing file system - amazon-web-services

Question

Currently, I have a json that will create a EFS in an auto scaling group. However, how can I make it so it mounts an existing EFS that is previously created (so i can pre-load data)
this is the current set up
"FileSystem": {
"Type": "AWS::EFS::FileSystem",
"Properties": {
"PerformanceMode": "generalPurpose",
"FileSystemTags": [
{
"Key": "Name",
"Value": { "Ref" : "VolumeName" }
}
]
}
},
"MountTarget": {
"Type": "AWS::EFS::MountTarget",
"Properties": {
"FileSystemId": { "Ref": "FileSystem" },
"SubnetId": { "Ref": "Subnet" },
"SecurityGroups": [ { "Ref": "MountTargetSecurityGroup" } ]
}
},

Answer 1

As per #MaiKaY Suggested, Just Pass the FileSystemId as a Parameter.
here is the mounting Script
container_commands:
1chown:
command: "chown webapp:webapp /wpfiles"
2create:
command: "sudo -u webapp mkdir -p wp-content/uploads"
3link:
command: "sudo -u webapp ln -s /wpfiles wp-content/uploads"
option_settings:
aws:elasticbeanstalk:application:environment:
FILE_SYSTEM_ID: 'FileSystemId' #Provide your FileSystemId
MOUNT_DIRECTORY: '/wpfiles'
REGION: '`{"Ref": "AWS::Region"}`'
packages:
yum:
nfs-utils: []
jq: []
commands:
01_mount:
command: "/tmp/mount-efs.sh"
files:
"/tmp/mount-efs.sh":
mode: "000755"
content : |
#!/bin/bash
EFS_REGION=$(/opt/elasticbeanstalk/bin/get-config environment | jq -r '.REGION')
EFS_MOUNT_DIR=$(/opt/elasticbeanstalk/bin/get-config environment | jq -r '.MOUNT_DIRECTORY')
EFS_FILE_SYSTEM_ID=$(/opt/elasticbeanstalk/bin/get-config environment | jq -r '.FILE_SYSTEM_ID')
echo "Mounting EFS filesystem ${EFS_DNS_NAME} to directory ${EFS_MOUNT_DIR} ..."
echo 'Stopping NFS ID Mapper...'
service rpcidmapd status &> /dev/null
if [ $? -ne 0 ] ; then
echo 'rpc.idmapd is already stopped!'
else
service rpcidmapd stop
if [ $? -ne 0 ] ; then
echo 'ERROR: Failed to stop NFS ID Mapper!'
exit 1
fi
fi
echo 'Checking if EFS mount directory exists...'
if [ ! -d ${EFS_MOUNT_DIR} ]; then
echo "Creating directory ${EFS_MOUNT_DIR} ..."
mkdir -p ${EFS_MOUNT_DIR}
if [ $? -ne 0 ]; then
echo 'ERROR: Directory creation failed!'
exit 1
fi
else
echo "Directory ${EFS_MOUNT_DIR} already exists!"
fi
mountpoint -q ${EFS_MOUNT_DIR}
if [ $? -ne 0 ]; then
echo "mount -t nfs4 -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2 ${EFS_FILE_SYSTEM_ID}:/ ${EFS_MOUNT_DIR}"
mount -t nfs4 -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2 ${EFS_FILE_SYSTEM_ID}:/ ${EFS_MOUNT_DIR}
if [ $? -ne 0 ] ; then
echo 'ERROR: Mount command failed!'
exit 1
fi
chmod 777 ${EFS_MOUNT_DIR}
runuser -l ec2-user -c "touch ${EFS_MOUNT_DIR}/it_works"
if [[ $? -ne 0 ]]; then
echo 'ERROR: Permission Error!'
exit 1
else
runuser -l ec2-user -c "rm -f ${EFS_MOUNT_DIR}/it_works"
fi
else
echo "Directory ${EFS_MOUNT_DIR} is already a valid mountpoint!"
fi
echo 'EFS mount complete.'