Difference between revisions of "Aws-storage"

__NOTOC__

= Persistent Storage =

== Prepare the work environment ==

Before start ensure you have the latest EC2 API tools installed on system.

Download the latest EC2 API from Amazon:

[http://developer.amazonwebservices.com/connect/entry.jspa?externalID=351]

And follow the instructions in [[aws-build|Buindling an AMI]] to install or replace the current API.

<pre><nowiki>#!wiki warning

'''Warning'''

Older releases of EC2 API cannot handle persistent volume commands.

</nowiki></pre>

== Create volume ==

# Look for available zones

<pre><nowiki>

# ec2-describe-availability-zones

AVAILABILITYZONE us-east-1a available

AVAILABILITYZONE us-east-1b available

AVAILABILITYZONE us-east-1c available

</nowiki></pre>

# Create a volume, the `-s` specifies the size in Gigabytes.

<pre><nowiki>

# ec2-create-volume -z us-east-1a -s 549755813888

Client.InvalidParameterValue: Volume of 549755813888GiB is too large; maximum is 1024GiB.

# ec2-create-volume -z us-east-1a -s 128

VOLUME vol-cd2dc8a4 128 us-east-1a creating 2008-08-29T01:07:22+0000

</nowiki></pre>

# Check the volume status

<pre><nowiki>

# ec2-describe-volumes

VOLUME vol-cd2dc8a4 128 us-east-1a available 2008-08-29T01:07:22+0000

</nowiki></pre>

== Attach volume to an instance ==

# Get the instance name

<pre><nowiki>

# ec2-describe-instances

RESERVATION r-9f5c9ff6 367161194499 default

INSTANCE i-577aae3e ami-43ab4f2a ec2-75-101-129-154.compute-1.amazonaws.com domU-12-31-39-00-A2-02 .compute-1.internal running bashlinux-general-server-keypair 0 m1.small 2008-06-20T01:57:42+0000 us-east-1a

</nowiki></pre>

# Attach the volume using the instance name `i-577aae3e` obtained from the last command, note that `/dev/sdb` must not exist, in case it does, then just use another name not used yet

<pre><nowiki>

# ec2-attach-volume vol-cd2dc8a4 -i i-577aae3e -d /dev/sdb

ATTACHMENT vol-cd2dc8a4 i-577aae3e /dev/sdb attaching 2008-08-29T01:18:06+0000

</nowiki></pre>

# Login into the instance

<pre><nowiki>

# ssh -i .ssh/bashlinux-general-server-keypair [email protected]

</nowiki></pre>

# Format the new attached drive `/dev/sdb`

<pre><nowiki>

[root@ec2 ~]# mkfs -t ext3 /dev/sdb

mke2fs 1.39 (29-May-2006)

/dev/sdb is entire device, not just one partition!

Proceed anyway? (y,n) y

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

16777216 inodes, 33554432 blocks

1677721 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=0

1024 block groups

32768 blocks per group, 32768 fragments per group

16384 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 38 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

</nowiki></pre>

# Mount the new partitioned drive

<pre><nowiki>

[root@ec2 ~]# mkdir -p /mnt/storage

[root@ec2 ~]# mount /dev/sdb /mnt/storage

</nowiki></pre>

# Check new partition space

<pre><nowiki>

[root@ec2 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda1 4.0G 4.0G 0 100% /

none 851M 0 851M 0% /dev/shm

/dev/sda2 147G 388M 139G 1% /mnt

/dev/sdb 126G 188M 120G 1% /mnt/storage

</nowiki></pre>

== Remove volume ==

# Login into the instance

<pre><nowiki>

# ssh -i .ssh/bashlinux-general-server-keypair [email protected]

</nowiki></pre>

# Unmount the volume

<pre><nowiki>

[root@ec2 log]# umount /mnt/storage

</nowiki></pre>

# Check the volume was unmounted

<pre><nowiki>

[root@ec2 log]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda1 4.0G 4.0G 0 100% /

none 851M 0 851M 0% /dev/shm

/dev/sda2 147G 388M 139G 1% /mnt

</nowiki></pre>

# Logout from the instance

<pre><nowiki>

[root@ec2 log]# exit

</nowiki></pre>

# Detach the volume

<pre><nowiki>

# ec2-detach-volume vol-cd2dc8a4 -i i-577aae3e -d /dev/sdb

ATTACHMENT vol-cd2dc8a4 i-577aae3e /dev/sdb detaching 2008-08-29T01:18:06+0000

</nowiki></pre>

# Delete volume

<pre><nowiki>

# ec2-delete-volume vol-cd2dc8a4

VOLUME vol-cd2dc8a4

</nowiki></pre>

# Check deleted volume

<pre><nowiki>

# ec2-describe-volumes

VOLUME vol-cd2dc8a4 128 us-east-1a deleting 2008-08-29T01:07:22+0000

</nowiki></pre>