coreos cloud-config file for dynamically mount aws efs in the right availability zone

coreos-efs-cloud-config

#cloud-config

write-files:
 - path: /etc/conf.d/nfs
   permissions: '0644'
   content: |
     OPTS_RPC_MOUNTD=""
users:
   - name: XYZ
     groups:
       - sudo
       - docker
     ssh-authorized-keys:
       - ssh-rsa XYZ
coreos:
  etcd:
    discovery: https://discovery.etcd.io/XYZ
    peer-addr: $private_ipv4:7001
  units:
    - name: rpc-statd.service
      command: start
      enable: true
    - name: mnt-efs.mount
      content: |
         [Mount]
         What=AZ_ZONE.fs-XYZ.efs.AMAZON_REGION.amazonaws.com:/
         Where=/mnt/efs
         Type=nfs
    - name: etcd.service
      command: start
    - name: fleet.service
      command: start
    - name: runcmd.service
      command: start
      content: |
         [Unit]
         Description=command
         [Service]
         Type=oneshot
         ExecStart=/bin/sh -c "AZ_ZONE=$(curl -L http://169.254.169.254/latest/meta-data/placement/availability-zone); sed -i \"s/AZ_ZONE/$AZ_ZONE/\" /etc/systemd/system/mnt-efs.mount; systemctl daemon-reload; systemctl restart mnt-efs.mount"