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Posts Tagged ‘mount’

Create and Attach AWS EBS Volume to AWS EC2 -Linux

May 20, 2012 1 comment

Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides resizable compute capacity in the cloud. It is designed to make web-scale computing easier for developers. Amazon EC2 enables “compute” in the cloud.

Amazon Elastic Block Store (EBS) provides block level storage volumes for use with Amazon EC2 instances. EBS provides highly available, highly reliable storage volumes that can be attached to a running Amazon EC2 instance and exposed as a device within the instance. It persists independently from the life of an instance. These EBS volumes are created in a particular Availability Zone and can be from 1 GB to 1 TB in size.

Follow the below steps to Create, attach and mount EBS Volumes to launched EC2 instances:

Create the EBS Volume

Log into AWS Management Console and follow the below steps for all the each extra volume to be attached to instances. For example, let’s create and attach a 6GB EBS volume (for Oracle Alert Logs and Traces) to Database server.

• Choose “Volumes” on the left hand control panel:

• In the right-hand pane under EBS Volumes, click on ‘Create Volume’

• In Create Volume dialog box that appears:
Enter the size mentioned in table, keep availability zone same as that of Database instance and select No Snapshot and click on ‘Create’.

• This will create an EBS volume and once create is complete it will be displayed as

Attach Volume

• Select a volume and click on button to Attach Volume

• Select the instance for which EBS volume is to be attached. Also mention the mount point for the volume in device.
Here Instance is for database and mount device is /dev/sdf

• Once attached it will be displayed as

Mount the Volume

• Execute commands in the EC2 instance’s (Database Server) linux shell. As this is a new volume (with no data), we will have to format it
Run command:

mkfs -t ext3 /dev/sdf

(Replace text in blue with mount device used in previous step)

• Make a directory to mount the device.

mkdir /mnt/disk1

• Mount the device in newly created directory

mount /dev/sdf /mnt/disk1

(Replace text in blue as required)

• By default volumes will not be attached to the instance on reboot. To attach these volumes to given mount point every time on reboot, execute the following command

echo "/dev/sdf /mnt/disk1ext3 noatime 0 0" >> /etc/fstab"

(Replace text in blue as required)

Check attached volume by using command: df -h

Unmounting the volume

From the Elastic Block Storage Feature Guide: A volume must be unmounted inside the instance before being detached. Failure to do so will result in damage to the file system or the data it contains.

umount /mnt/disk1

Remember to cd out of the volume, otherwise you will get an error message

umount: /mnt/disk1: device is busy

Hope the above steps help you get into action in minutes.

In case you get stuck at any point, do comment below. I will be glad to help. 🙂

Installation and Setup of S3fs on Amazon Web Services

May 18, 2012 1 comment

FUSE-based file system backed by Amazon S3.

S3fs is a FUSE filesystem that allows you to mount an Amazon S3 bucket as a local filesystem. It doesn’t store anything on the Amazon EC2, but user can access the data on S3 from EC2 instance, as if a network drive attached to it.

S3fs-fuse project is written in python backed by Amazons Simple Storage service. Amazon offers an open API to build applications on top of this service, which several companies have done, using a variety of interfaces (web, rsync, fuse, etc).

Steps

These steps are specific to an Ubuntu Server.

  1. Launch an Ubuntu Server on AWS EC2. (Recommended AMI – ami-4205e72b, username : ubuntu )
  2. Login to the Server using Winscp / Putty
  3. Type below command   to update the existing libraries on the server.

sudo apt-get update

                       

4.Type command to upgrade the libraries. If any msg is prompted, say ‘y’ or ‘OK’ as applicable.
sudo apt-get upgrade


Once upgrade is complete, install the necessary libraries for fuse with following command

sudo aptitude install build-essential libcurl4-openssl-dev libxml2-dev libfuse-dev comerr-dev libfuse2 libidn11-dev libkadm55 libkrb5-dev libldap2-dev libselinux1-dev libsepol1-dev pkg-config fuse-utils sshfs

 If any msg is prompted, say ‘y’ or ‘OK’ as applicable.

        

 5. Once all the packages are installed, download the s3fs source (Revision 177 as of this writing) from the Google Code project:

6.Untar and install the s3fs binary: (Run each command individually)

tar xzvf s3fs-r177-source.tar.gz
cd ./s3fs
sudo make
sudo make install

7.  In order to use the allow_other option (see below) you will need to modify the fuse configuration:

sudo vi /etc/fuse.conf

 And uncomment the following line in the conf file: ( To uncomment a line, remove the  ‘#’ symbol )


 Save the file using command:  ‘Esc + : wq  ’

8. Now you can mount an S3 bucket. Create directory using command :

sudo mkdir -p /mnt/s3

Mount the bucket to the created directory

sudo s3fs bucketname -o accessKeyId=XXX -o secretAccessKey=YYY -o use_cache=/tmp -o allow_other /mnt/s3

Replace the XXX above with your real Amazon Access Key and YYY with your real Secret Key.

Command also includes instruction to cache the bucket’s files locally (in /tmp) and to Allow other users to be able to manipulate files in the mount.

Now any files written to /mnt/s3 will be replicated to your Amazon S3 bucket.

 WinScp – Verify mount directory

Check the wiki documentation for more options available to s3fs, including how to save your Access Key and Secret Key in /etc/passwd-s3fs.