Expect semiautomatic disk expansion script

Expect is a free programming language that enables automated and interactive tasks to communicate without the need for human intervention.

The expect RPM package needs to be installed before use, the version on the centos6.5 64 bit is expect-5.44.1.15-5.el6_4.x86_64

In addition, the scalability is built on the premise of/Is the logical volume:

View disk information through Df-h, for example:

Filesystem Size used Avail use% mounted on

/dev/mapper/volgroup-logvol01 35G 9.3G 24G 29%/

Tmpfs 7.8G 0 7.8G 0%/dev/shm

/DEV/SDA1 194M 34M 150M 19%/boot

Then view the logical volume information through Lvdisplay:

---Logical volume---

LV path/dev/volgroup/logvol01

LV Name LogVol01

VG Name VolGroup

LV UUID Cxd3nz-8goa-pye4-shyn-78yn-scbk-oqcvcz

LV Write Access Read/write

LV Creation Host, Time Localhost.localdomain, 2015-03-27 08:16:39 +0800

LV Status Available

# open 1

LV Size 35.05 GiB

Current LE 8974

Segments 1

Allocation inherit

Read ahead Sectors Auto

-Currently set to 256

Block Device 253:0

---Logical volume---

LV path/dev/volgroup/logvol00

LV Name LogVol00

VG Name VolGroup

LV UUID tp3pqg-vw3i-rvnd-wvz3-mws0-caif-lmpecl

LV Write Access Read/write

LV Creation Host, Time Localhost.localdomain, 2015-03-27 08:16:50 +0800

LV Status Available

# open 1

LV Size 2.00 GiB

Current LE 512

Segments 1

Allocation inherit

Read ahead Sectors Auto

-Currently set to 256

Block Device 253:1

You can see that the logical volume is /dev/mapper/volgroup-logvol01 and the disk capacity is 35.05G.

Assuming that the new disk is SDB and that 2 partitions already exist in the previous system, the following script will complete the partitioning action and the newly created partition is SDB1:

#!/usr/bin/expectspawn fdisk/dev/sdbexpect "):" Send "n\n" expect "4)" send "p\n" expect ":" Send "1\n" expect ":" send "\ n" Expect ":" send "\ n" expect "):" Send "p\n" expect "):" Send "w\n" expect Eofexitend

After the execution of the above script is complete, the system may need to be restarted.

The next step is to sdb1 into/

#!/usr/bin/expectset timeout 3600spawn mkfs.ext4 /dev/sdb1expect  ' override ' sleep  5spawn pvcreate /dev/sda3expect  ' successfully created ' sleep 5spawn  vgextend volgroup /dev/sda3expect  ' successfully extended ' Sleep 5spawn fdisk  -l /dev/sda3 set accum {}    expect {         {:* gb} {             set accum  "${accum} $expect _out (0,string)"         }     }puts  "\ n" puts  "###########################################" puts  "##### # sda3 has  $accum  free space ###### "puts " ################################# ########## "puts " \ n "puts " Please type the percentage of free space   (1 to 100,defaul 100),  then type enter: "puts " Please enter a positive integer within 100, Sda3 free disk space by percentage   add to  /  use, and end with carriage return. The direct carriage return defaults to 100%: "expect_user " \ n " {set raw  $expect _out (buffer) # remove final  carriage returnset response [string trimright  "$raw"   "\n%"]}if {$response = = "} {set response 100}puts " $response "spawn lvextend -l + $response%free  /dev/mapper/VolGroup-LogVol01expect  ' successfully resized ' sleep 5spawn resize2fs  /dev/mapper/VolGroup-LogVol01expect  ' Blocks long ' #set  timeout 5puts  Resize  complete! " Exitend

The script above will let you enter a number and decide how much space will be added to/from the new disk, and the direct return defaults to 100%.

Attached: expect_out usage

Expect-re ". *" {}

Automatically empties content inside the Expect_out cache

Expect_out (buffer) all the content entered

Expect_out (0,string) matches the input content

Expect semiautomatic disk expansion script