add swap memory to elastic beanstalk

swap.config

commands:
  create_pre_dir:
    command: "mkdir /opt/elasticbeanstalk/hooks/appdeploy/pre"
    ignoreErrors: true
files:
  "/opt/elasticbeanstalk/hooks/appdeploy/pre/00_setup_swap.sh":
    mode: "000755"
    owner: root
    group: root
    content: |
      #!/bin/bash

      SWAPFILE=/var/swapfile
      SWAP_MEGABYTES=4096

      if [ -f $SWAPFILE ]; then
        echo "Swapfile $SWAPFILE found, skipping"
        exit 0;
      fi

      /bin/dd if=/dev/zero of=$SWAPFILE bs=1M count=$SWAP_MEGABYTES
      /bin/chmod 600 $SWAPFILE
      /sbin/mkswap $SWAPFILE
      /sbin/swapon $SWAPFILE
      exit 0;