aws-attach-volume-to-instance.txt

[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /etc/udev/rules.d/
total 20K
-rw-r--r-- 1 root root  640 May  8  2014 51-ec2-hvm-devices.rules
-rw-r--r-- 1 root root  641 May  8  2014 52-ec2-vcpu.rules
-rw-r--r-- 1 root root  724 May  8  2014 53-ec2-network-interfaces.rules
-rw-r--r-- 1 root root  326 Jul  9  2014 60-raw.rules
-rw-r--r-- 1 root root 1.4K May  8  2014 75-persistent-net-generator.rules


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/udev/rules.d/51-ec2-hvm-devices.rules
# Copyright (C) 2006-2014 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

KERNEL=="xvd*", PROGRAM="/sbin/ec2udev-vbd %k", SYMLINK+="%c"


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /sbin/ec2udev-vbd
#!/bin/bash

# Copyright (C) 2006-2014 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

# Maintain consistent naming scheme with current EC2 instances
if [ "$#" -ne 1 ] ; then
  echo "$0 <device>" >&2
  exit 1
else
  if echo "$1"|grep -qE 'xvd[a-z][0-9]?' ; then
    echo "$1" | sed -e 's/xvd/sd/'
  else
    echo "$1"
  fi
fi


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/udev/rules.d/60-raw.rules
#
# Enter raw device bindings here.
#
# An example would be:
#   ACTION=="add", KERNEL=="sda", RUN+="/usr/bin/raw /dev/raw/raw1 %N"
# to bind /dev/raw/raw1 to /dev/sda, or
#   ACTION=="add", ENV{MAJOR}=="8", ENV{MINOR}=="1", RUN+="/usr/bin/raw /dev/raw/raw2 %M %m"
# to bind /dev/raw/raw2 to the device with major 8, minor 1.
[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/udev/rules.d/52-ec2-vcpu.rules
# Copyright (C) 2014 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

SUBSYSTEM=="cpu", ACTION=="add", RUN+="/sbin/ec2udev-vcpu $devpath"


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/udev/rules.d/53-ec2-network-interfaces.rules
# Copyright (C) 2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth*", IMPORT{program}="/bin/sleep 1"
SUBSYSTEM=="net", RUN+="/etc/sysconfig/network-scripts/ec2net.hotplug"


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/udev/rules.d/75-persistent-net-generator.rules
# Copyright (C) 2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

# these rules generate rules for persistent network device naming
SUBSYSTEM!="net", GOTO="persistent_net_generator_end"
KERNEL!="eth*", GOTO="persistent_net_generator_end"
ACTION!="add", GOTO="persistent_net_generator_end"
NAME=="?*", GOTO="persistent_net_generator_end"

# do not create rule for eth0
ENV{INTERFACE}=="eth0", GOTO="persistent_net_generator_end"

# read MAC address
ENV{MATCHADDR}="$attr{address}"

# do not use empty address
ENV{MATCHADDR}=="00:00:00:00:00:00", GOTO="persistent_net_generator_end"

# discard any interface name not generated by our rules
ENV{INTERFACE_NAME}=="?*", ENV{INTERFACE_NAME}=""

# default comment
ENV{COMMENT}="elastic network interface"

# write rule
IMPORT{program}="write_net_rules"

# rename interface if needed
ENV{INTERFACE_NEW}=="?*", NAME="$env{INTERFACE_NEW}"

LABEL="persistent_net_generator_end"


attach a volume dmesg log:
Aug 27 13:28:34 ip-172-31-24-248 kernel: [286073.819561] blkfront: xvdf: barrier or flush: disabled; persistent grants: disabled; indirect descriptors: enabled;
Aug 27 13:28:34 ip-172-31-24-248 kernel: [286073.836337]  xvdf: unknown partition table


[ec2-user@ip-172-31-24-248 ~]$ sudo fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/xvda: 8589 MB, 8589934592 bytes, 16777216 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 label type: gpt


#         Start          End    Size  Type            Name
 1         4096     16777182      8G  Linux filesyste Linux
128         2048         4095      1M  BIOS boot parti BIOS Boot Partition

Disk /dev/xvdf: 1073 MB, 1073741824 bytes, 2097152 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

[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /dev/disk/by-path/*
lrwxrwxrwx 1 root root 10 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712 -> ../../xvda
lrwxrwxrwx 1 root root 11 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712-part1 -> ../../xvda1
lrwxrwxrwx 1 root root 10 Aug 27 13:28 /dev/disk/by-path/xen-vbd-51792 -> ../../xvdf

[ec2-user@ip-172-31-24-248 ~]$ ls -lh /dev/sd*
lrwxrwxrwx 1 root root 4 Aug 24 06:01 /dev/sda -> xvda
lrwxrwxrwx 1 root root 5 Aug 24 06:01 /dev/sda1 -> xvda1
lrwxrwxrwx 1 root root 4 Aug 27 13:28 /dev/sdf -> xvdf


[ec2-user@ip-172-31-24-248 ~]$ sudo rpm -qa | grep ec2
aws-apitools-ec2-1.7.3.0-1.0.amzn1.noarch
ec2-utils-0.4-1.22.amzn1.noarch
ec2-net-utils-0.4-1.22.amzn1.noarch
aws-amitools-ec2-1.5.6-1.1.amzn1.noarch
[ec2-user@ip-172-31-24-248 ~]$ sudo rpm -ql ec2-utils-0.4-1.22.amzn1.noarch
/etc/udev/rules.d/51-ec2-hvm-devices.rules
/etc/udev/rules.d/52-ec2-vcpu.rules
/opt/aws/bin/ec2-metadata
/sbin/ec2udev-vbd
/sbin/ec2udev-vcpu
[ec2-user@ip-172-31-24-248 ~]$ sudo rpm -ql ec2-net-utils-0.4-1.22.amzn1.noarch
/etc/dhcp/dhclient.d/ec2dhcp.sh
/etc/init/elastic-network-interfaces.conf
/etc/modprobe.d/ixgbevf.conf
/etc/sysconfig/modules/acpiphp.modules
/etc/sysconfig/network-scripts/ec2net-functions
/etc/sysconfig/network-scripts/ec2net.hotplug
/etc/udev/rules.d/53-ec2-network-interfaces.rules
/etc/udev/rules.d/75-persistent-net-generator.rules
/sbin/ec2ifdown
/sbin/ec2ifscan
/sbin/ec2ifup
/usr/share/man/man8/ec2ifdown.8.gz
/usr/share/man/man8/ec2ifscan.8.gz
/usr/share/man/man8/ec2ifup.8.gz


[ec2-user@ip-172-31-24-248 ~]$ sudo cat /opt/aws/bin/ec2-metadata
#!/bin/bash

# Copyright (C) 2006-2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

function print_help()
{
echo "ec2-metadata v0.1.2
Use to retrieve EC2 instance metadata from within a running EC2 instance.
e.g. to retrieve instance id: ec2-metadata -i
                 to retrieve ami id: ec2-metadata -a
                 to get help: ec2-metadata --help
For more information on Amazon EC2 instance meta-data, refer to the documentation at
http://docs.amazonwebservices.com/AWSEC2/2008-05-05/DeveloperGuide/AESDG-chapter-instancedata.html

Usage: ec2-metadata <option>
Options:
--all                     Show all metadata information for this host (also default).
-a/--ami-id               The AMI ID used to launch this instance
-l/--ami-launch-index     The index of this instance in the reservation (per AMI).
-m/--ami-manifest-path    The manifest path of the AMI with which the instance was launched.
-n/--ancestor-ami-ids     The AMI IDs of any instances that were rebundled to create this AMI.
-b/--block-device-mapping Defines native device names to use when exposing virtual devices.
-i/--instance-id          The ID of this instance
-t/--instance-type        The type of instance to launch. For more information, see Instance Types.
-h/--local-hostname       The local hostname of the instance.
-o/--local-ipv4           Public IP address if launched with direct addressing; private IP address if launched with public addressing.
-k/--kernel-id            The ID of the kernel launched with this instance, if applicable.
-z/--availability-zone    The availability zone in which the instance launched. Same as placement
-c/--product-codes        Product codes associated with this instance.
-p/--public-hostname      The public hostname of the instance.
-v/--public-ipv4          NATted public IP Address
-u/--public-keys          Public keys. Only available if supplied at instance launch time
-r/--ramdisk-id           The ID of the RAM disk launched with this instance, if applicable.
-e/--reservation-id       ID of the reservation.
-s/--security-groups      Names of the security groups the instance is launched in. Only available if supplied at instance launch time
-d/--user-data            User-supplied data.Only available if supplied at instance launch time."
}

#check some basic configurations before running the code
function chk_config()
{
        #check if run inside an ec2-instance
        x=$(curl -sq http://169.254.169.254/)
        if [ $? -gt 0 ]; then
                echo '[ERROR] Command not valid outside EC2 instance. Please run this command within a running EC2 instance.'
                exit 1
        fi
}

#print standard metric
function print_normal_metric() {
        metric_path=$2
        echo -n $1": "
        RESPONSE=$(curl -fsq http://169.254.169.254/latest/${metric_path}/)
        if [ $? == 0 ]; then
                echo $RESPONSE
        else
                echo not available
        fi
}

#print block-device-mapping
function print_block-device-mapping()
{
echo 'block-device-mapping: '
x=$(curl -fsq http://169.254.169.254/latest/meta-data/block-device-mapping/)
if [ $? -eq 0 ]; then
        for i in $x; do
                echo -e '\t' $i: $(curl -sq http://169.254.169.254/latest/meta-data/block-device-mapping/$i)
        done
else
        echo not available
fi
}

#print public-keys
function print_public-keys()
{
        echo 'public-keys: '
        x=$(curl -fsq http://169.254.169.254/latest/meta-data/public-keys/)
        if [ $? -eq 0 ]; then
                for i in $x; do
                        index=$(echo $i|cut -d = -f 1)
                        keyname=$(echo $i|cut -d = -f 2)
                        echo keyname:$keyname
                        echo index:$index
                        format=$(curl -sq http://169.254.169.254/latest/meta-data/public-keys/$index/)
                        echo format:$format
                        echo 'key:(begins from next line)'
                        echo $(curl -sq http://169.254.169.254/latest/meta-data/public-keys/$index/$format)
                done
        else
                echo not available
        fi
}


function print_all()
{
        print_normal_metric ami-id meta-data/ami-id
        print_normal_metric ami-launch-index meta-data/ami-launch-index
        print_normal_metric ami-manifest-path meta-data/ami-manifest-path
        print_normal_metric ancestor-ami-ids meta-data/ancestor-ami-ids
        print_block-device-mapping
        print_normal_metric instance-id meta-data/instance-id
        print_normal_metric instance-type meta-data/instance-type
        print_normal_metric local-hostname meta-data/local-hostname
        print_normal_metric local-ipv4 meta-data/local-ipv4
        print_normal_metric kernel-id meta-data/kernel-id
        print_normal_metric placement meta-data/placement/availability-zone
        print_normal_metric product-codes meta-data/product-codes
        print_normal_metric public-hostname meta-data/public-hostname
        print_normal_metric public-ipv4 meta-data/public-ipv4
        print_public-keys
        print_normal_metric ramdisk-id /meta-data/ramdisk-id
        print_normal_metric reservation-id /meta-data/reservation-id
        print_normal_metric security-groups meta-data/security-groups
        print_normal_metric user-data user-data
}

#check if run inside an EC2 instance
chk_config

#command called in default mode
if [ "$#" -eq 0 ]; then
        print_all
fi

#start processing command line arguments
while [ "$1" != "" ]; do
        case $1 in
        -a | --ami-id )                print_normal_metric ami-id meta-data/ami-id
                                                                                                                          ;;
        -l | --ami-launch-index )      print_normal_metric ami-launch-index meta-data/ami-launch-index
                                                                                                                          ;;
        -m | --ami-manifest-path )     print_normal_metric ami-manifest-path meta-data/ami-manifest-path
                                                                                                                          ;;
        -n | --ancestor-ami-ids )      print_normal_metric ancestor-ami-ids meta-data/ancestor-ami-ids
                                                                                                                          ;;
        -b | --block-device-mapping )  print_block-device-mapping
                                                                                                                          ;;
        -i | --instance-id )           print_normal_metric instance-id meta-data/instance-id
                                                                                                                          ;;
        -t | --instance-type )         print_normal_metric instance-type meta-data/instance-type
                                                                                                                          ;;
        -h | --local-hostname )        print_normal_metric local-hostname meta-data/local-hostname
                                                                                                                          ;;
        -o | --local-ipv4 )            print_normal_metric local-ipv4 meta-data/local-ipv4
                                                                                                                          ;;
        -k | --kernel-id )             print_normal_metric kernel-id meta-data/kernel-id
                                                                                                                          ;;
        -z | --availability-zone )     print_normal_metric placement meta-data/placement/availability-zone
                                                                                                                          ;;
        -c | --product-codes )         print_normal_metric product-codes meta-data/product-codes
                                                                                                                          ;;
        -p | --public-hostname )       print_normal_metric public-hostname meta-data/public-hostname
                                                                                                                          ;;
        -v | --public-ipv4 )           print_normal_metric public-ipv4 meta-data/public-ipv4
                                                                                                                          ;;
        -u | --public-keys )           print_public-keys
                                                                                                                          ;;
        -r | --ramdisk-id )            print_normal_metric ramdisk-id /meta-data/ramdisk-id
                                                                                                                          ;;
        -e | --reservation-id )        print_normal_metric reservation-id /meta-data/reservation-id
                                                                                                                          ;;
        -s | --security-groups )       print_normal_metric security-groups meta-data/security-groups
                                                                                                                          ;;
        -d | --user-data )             print_normal_metric user-data user-data
                                                                                                                          ;;
        -h | --help )                  print_help
                                                                 exit
                                                                                                                          ;;
        --all )                        print_all
                                                                 exit
                                                                                                                          ;;
        * )                            print_help
                                                                 exit 1
        esac
        shift
done



[ec2-user@ip-172-31-24-248 ~]$ sudo cat /etc/sysconfig/network-scripts/ec2net.hotplug
#!/bin/bash

# Copyright (C) 2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#    http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the
# License.

# During init and before the network service is started, metadata is not
# available. Exit without attempting to configure the elastic interface.
if [ ! -f /var/lock/subsys/network ]; then
  exit
fi
if [ -f /dev/.in_sysinit ]; then
  exit
fi

. /etc/sysconfig/network-scripts/ec2net-functions

case $ACTION in
  add)
    plug_interface
    ;;
  remove)
    unplug_interface
    ;;
esac


after dettach the volume.
[ec2-user@ip-172-31-24-248 ~]$ sudo fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/xvda: 8589 MB, 8589934592 bytes, 16777216 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 label type: gpt


#         Start          End    Size  Type            Name
 1         4096     16777182      8G  Linux filesyste Linux
128         2048         4095      1M  BIOS boot parti BIOS Boot Partition
[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /dev/disk/by-path/*
lrwxrwxrwx 1 root root 10 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712 -> ../../xvda
lrwxrwxrwx 1 root root 11 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712-part1 -> ../../xvda1
[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /dev/sd*
lrwxrwxrwx 1 root root 4 Aug 24 06:01 /dev/sda -> xvda
lrwxrwxrwx 1 root root 5 Aug 24 06:01 /dev/sda1 -> xvda1

attach-a-sde-disk-dmesg-log:
Aug 27 14:14:27 ip-172-31-24-248 kernel: [288826.732292] blkfront: xvde: barrier or flush: disabled; persistent grants: disabled; indirect descriptors: enabled;
Aug 27 14:14:27 ip-172-31-24-248 kernel: [288826.746452]  xvde: unknown partition table

[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /dev/disk/by-path/*
lrwxrwxrwx 1 root root 10 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712 -> ../../xvda
lrwxrwxrwx 1 root root 11 Aug 24 06:01 /dev/disk/by-path/xen-vbd-51712-part1 -> ../../xvda1
lrwxrwxrwx 1 root root 10 Aug 27 14:14 /dev/disk/by-path/xen-vbd-51776 -> ../../xvde
[ec2-user@ip-172-31-24-248 ~]$ sudo ls -lh /dev/sd*
lrwxrwxrwx 1 root root 4 Aug 24 06:01 /dev/sda -> xvda
lrwxrwxrwx 1 root root 5 Aug 24 06:01 /dev/sda1 -> xvda1
lrwxrwxrwx 1 root root 4 Aug 27 14:14 /dev/sde -> xvde
[ec2-user@ip-172-31-24-248 ~]$ sudo fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/xvda: 8589 MB, 8589934592 bytes, 16777216 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 label type: gpt


#         Start          End    Size  Type            Name
 1         4096     16777182      8G  Linux filesyste Linux
128         2048         4095      1M  BIOS boot parti BIOS Boot Partition

Disk /dev/xvde: 1073 MB, 1073741824 bytes, 2097152 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



[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvde
/dev/sde
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd xvde
sde
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/sde
/dev/sde
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd sde
sde


[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/sdf
/dev/sdf
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/sdgg
/dev/sdgg
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/ddd
/dev/ddd
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvdg
/dev/sdg
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvdgg
/dev/sdgg
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvdggggg1111
/dev/sdggggg1111
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xggg
/dev/xggg
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xv123
/dev/xv123
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvd123
/dev/xvd123
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/xvda123
/dev/sda123
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/sdbb
/dev/sdbb
[ec2-user@ip-172-31-24-248 ~]$ sudo /sbin/ec2udev-vbd /dev/sd1234
/dev/sd1234


http://blog.csdn.net/gaoxingnengjisuan/article/details/9157977