04_efs_mount.config

###################################################################################################
#### Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
####
#### Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file
#### except in compliance with the License. A copy of the License is located at
####
####     https://aws.amazon.com/apache2.0/
####
#### or in the "license" file accompanying this file. This file is distributed on an "AS IS"
#### BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#### License for the specific language governing permissions and limitations under the License.
###################################################################################################

###################################################################################################
#### This configuration file mounts an Amazon EFS file system to a directory named /efs. To mount
#### the file system to a different path, modify the MOUNT_DIRECTORY value in the "option_settings"
#### section.
####
#### The FILE_SYSTEM_ID setting references a resource named "FileSystem", which is created by the
#### storage-efs-createfilesystem.config configuration file. To use this file to mount a
#### file system that you created outside of AWS Elastic Beanstalk, replace the Ref with the
#### resource ID (e.g., fs-e7605f4e):
####
####      FILE_SYSTEM_ID: fs-cb379562
####
#### If your environment and file system are in a custom VPC, you must configure the VPC to allow
#### DNS resolution and DNS host names. See this topic in the VPC User Guide for more information:
####    https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html
###################################################################################################

option_settings:
  aws:elasticbeanstalk:application:environment:
    MOUNT_DIRECTORY: '/efs'

##############################################
#### Do not modify values below this line ####
##############################################
    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 '.EFS_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
            chmod 777 ${EFS_MOUNT_DIR}
            if [ $? -ne 0 ]; then
                echo 'ERROR: Permission update failed!'
                exit 1
            fi
        else
            echo "Directory ${EFS_MOUNT_DIR} already exists!"
        fi

        mountpoint -q ${EFS_MOUNT_DIR}
        if [ $? -ne 0 ]; then
            echo "Maybe appending ${EFS_FILE_SYSTEM_ID}.efs.${EFS_REGION}.amazonaws.com mount to /etc/fstab"
            grep -q -F "${EFS_FILE_SYSTEM_ID}.efs.${EFS_REGION}.amazonaws.com" /etc/fstab || echo "${EFS_FILE_SYSTEM_ID}.efs.${EFS_REGION}.amazonaws.com:/ ${EFS_MOUNT_DIR} nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2 0 0" >> /etc/fstab
            mount -a -t nfs4
            if [ $? -ne 0 ] ; then
                echo 'ERROR: Mount command failed!'
                exit 1
            fi
        else
            echo "Directory ${EFS_MOUNT_DIR} is already a valid mountpoint!"
        fi

        echo 'EFS mount complete.'