Wednesday, November 26, 2014

Re-size Amazon EC2 Instance Disk Size

Resize Amazon EC2 Instance Disk
1) Create Snapshot from Volume
2) Create Volume From New Snapshot & give size as you want.
3) Stop EC2 Instance
4) Go to Volume & detach Volume
5) Attach  new Volume as /dev/sda1
6) Start Instance & do the following
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 6.0G 2.0G 3.7G 35% /
tmpfs 15G 0 15G 0% /dev/shm
# fdisk -l
Disk /dev/xvda: 21.5 GB, 21474836480 bytes
97 heads, 17 sectors/track, 25435 cylinders
Units = cylinders of 1649 * 512 = 844288 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003b587
Device Boot Start End Blocks Id System
/dev/xvda1 * 2 7632 6291456 83 Linux
# fdisk /dev/xvda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): u
Changing display/entry units to sectors
Command (m for help): p
Disk /dev/xvda: 21.5 GB, 21474836480 bytes
97 heads, 17 sectors/track, 25435 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003b587
Device Boot Start End Blocks Id System /dev/xvda1 * 2048 12584959 6291456 83 Linux
Command (m for help): d
Selected partition 1
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1 First sector (17-41943039, default 17): 2048 Type same value you see above
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): Enter
Using default value 41943039
Command (m for help): p
Disk /dev/xvda: 21.5 GB, 21474836480 bytes
97 heads, 17 sectors/track, 25435 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003b587
Device Boot Start End Blocks Id System
/dev/xvda1 2048 41943039 20970496 83 Linux
Command (m for help): a
Partition number (1-4): 1
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
# reboot

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 20G 2.0G 17G 11% /
tmpfs 15G 0 15G 0% /dev/shm

# resize2fs /dev/xvda1

# df -h

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