AWS : Mount EFS on EC2 - Part II - V Important

 sudo mkdir -p /efs

sudo chmod -R ugo+rwx /efs     

ls -ld /efs 

sudo vi /etc/fstab

fs-face524e.efs.us-east-1.amazonaws.com:/ /efs nfs4 rw,intr,hard,_netdev,nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport

sudo mount -a

sudo reboot now

chmod -R 777 /efs  is not safer

chmod -R ugo+rwx /efs is safer - Does not override SETUID AND SETGID BITS - Just Appends permissions

https://unix.stackexchange.com/questions/296675/is-chmod-r-ugorwx-safer-than-chmod-r-777

cd / && sudo umount /efs && sudo mv /efs /fileshare && sudo chmod ugo+w /fileshare  && cat /etc/fstab 

sudo sed  -i 's+/efs+/fileshare+g' /etc/fstab 

sudo mount -a && sudo reboot now

ls -l /fileshare 

df -h

ls -l /fileshare ; df -h

ls -l /fileshare && df -h

umount /efs 

sudo mv /efs /fileshare

sudo chmod ugo+w /fileshare

sudo vi /etc/fstab

sudo reboot now

https://www.cyberciti.biz/faq/how-to-use-sed-to-find-and-replace-text-in-files-in-linux-unix-shell/

sudo sed   's/efs/fileshare/g' /etc/fstab   //Replace content and its temporary

sudo sed   's+/efs+/fileshare+g' /etc/fstab  // Change Delimiter

sudo sed  -i 's+/efs+/fileshare+g' /etc/fstab //-i save changes to file/stream

sudo sed  -e '/fs-face524e/s/fileshare/helloooo/' /etc/fstab //Replace only if lines contain specific string "fs-face524e"

AWS : EFS : Mount Target and Mount in EC2

sudo apt-get -y install nfs-common
sudo yum -y install nfs-utils
sudo service nfs start
sudo service nfs status

sudo su -
sudo mkdir -p /efs
sudo chmod -R ugo+rwx /efs     
ls -ld /efs 

echo 'fs-face524e.efs.us-east-1.amazonaws.com:/ /efs nfs4 rw,intr,hard,_netdev,nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0' >> /etc/fstab

sudo mount -a

sudo reboot now

umount -f efs
sudo mount -a

#fs-face524e.efs.us-east-1.amazonaws.com:/ /efs nfs4 rw,intr,hard,_netdev,nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0

#echo 'fs-face524e.efs.us-east-1.amazonaws.com:/ /efs nfs4 rw,intr,hard,_netdev,nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0' | sudo tee -a /etc/fstab

#sudo vi /etc/fstab

chmod -R 777 /efs  is not safer

chmod -R ugo+rwx /efs is safer - Does not override SETUID AND SETGID BITS - Just Appends permissions

https://unix.stackexchange.com/questions/296675/is-chmod-r-ugorwx-safer-than-chmod-r-777

https://www.thegeekdiary.com/understanding-the-configuration-file-for-mounting-file-systems-etc-fstab/

https://askubuntu.com/questions/9939/what-do-the-last-two-fields-in-fstab-mean

The EFS mount helper is part of the amazon-efs-utils package. 

The amazon-efs-utils package is an open-source collection of Amazon EFS tools. 

For more information, see Manually installing the Amazon EFS client.

https://docs.aws.amazon.com/efs/latest/ug/installing-amazon-efs-utils.html#installing-efs-utils-amzn-linux

https://docs.aws.amazon.com/efs/latest/ug/installing-amazon-efs-utils.html#installing-other-distro

Before the Amazon EFS mount helper was available, 

we recommended mounting your Amazon EFS file systems using the standard Linux NFS client.

https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-old.html#mounting-fs-install-nfsclient

https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-mount-cmd-dns-name.html

https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-mount-cmd-ip-addr.html

https://docs.aws.amazon.com/efs/latest/ug/efs-mount-helper.html#mount-fs-auto-mount-onreboot

To view and copy the exact commands to mount your EFS file system using the mount target IP address

Open the Amazon Elastic File System console at https://console.aws.amazon.com/efs/.

In the Amazon EFS console, choose the file system that you want to mount to display its details page.

To display the mount commands to use for this file system, choose Attach in the upper right.

The Attach screen displays the exact commands to use for mounting the file system.

https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2_instance-profiles.html

https://kichik.com/2020/09/08/how-does-ec2-instance-profile-work/

https://computingforgeeks.com/mount-aws-efs-file-system-on-ec2/

https://docs.aws.amazon.com/efs/latest/ug/efs-mount-helper.html#mounting-access-points

sudo mkdir /efs

sudo mount -t nfs4 -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport fs-face524e.efs.us-east-1.amazonaws.com:/ efs

fs-face524e.efs.us-east-1.amazonaws.com:/ efs nfs4 defaults,_netdev 0 0

umount -f efs

sudo mount -a

Mounting on Amazon EC2 with a DNS name

Mounting with an IP address [https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-mount-cmd-dns-name.html]

Mounting your Amazon EFS file system automatically[https://docs.aws.amazon.com/efs/latest/ug/mounting-fs-mount-cmd-ip-addr.html]

[https://docs.aws.amazon.com/efs/latest/ug/efs-mount-helper.html#mount-fs-auto-mount-onreboot]

NFS client

nfs-utils for RHEL, CentOS, Amazon Linux, and Fedora distributions

nfs-common for Debian and Ubuntu distributions

Network File Sharing (NFS) is a protocol that allows you to share directories and files with other Linux clients over a network

EBS vs EFS - AWS - Elastic Block Storage vs Elastic File System

https://aws.amazon.com/getting-started/tutorials/create-network-file-system/

https://www.missioncloud.com/blog/resource-amazon-ebs-vs-efs-vs-s3-picking-the-best-aws-storage-option-for-your-business

EBS  --------> 1 EC2 Instance is mapped to EBS - Block Level Storage

EFS ----------> Multiple EC2 Instances - Mounted to this File System - Common across multiple Apps

The main differences between EBS and EFS is that EBS is only accessible from a single EC2 instance in your particular AWS region, while EFS allows you to mount the file system across multiple regions and instances.

S3 -->  S3 is Object Level storage. S3 is not limited to EC2, Its linked to CloudFront through which many Media etc are hosted there.