Automate LVM With Python - Script

Task Description ??

?? 7.1: Elasticity Task -

?(C)

??Automating LVM Partition using Python-Script.

* For this task I will use RedHat 8 ( "192.168.43.160" ) -

* & I have already attached new volumes of "5 GiB" ( '/dev/sdb' , '/dev/sdc' , '/dev/sdd' , '/dev/sde' ) to this VM -

* To know how to attach new volumes to VM in VirtualBox then visit below article -

* To do this task I create make a python file ("lvm.py") who have different classes & method for LVM (Logical Volume Management) , so that we don't need to interact LVM commands directly. To create this python file I will follow these steps -

1) Create "VolumeGroup" Class Which will Manage Volume Group

2) Create "LogicalVolume" Class Which will Manage Logical Volume

* I will use a pre-created python module "subprocess" to develop this program file. First I will import this module.

Step - 1 Create "VolumeGroup" Class -

(A) Create "__init__" Method -

(B) Create "refresh" Method -

(C) Create "create" method -

(D) Create "display" method -

(E) Create "extend" method -

(F) Create "merge" method -

(G) Create "reduce" method -

(H) Create "rename" method -

(I) Create "remove" method -

(J) Create "add" method -

Step - 2 Create "LogicalVolume" Class -

(A) Create "__init__" method -

(B) Create "refresh" method -

(C) Create "create" method -

(D) Create "format" method -

(E) Create "mount" method -

(F) Create "unmount" method -

(G) Create "extend" method -

(H) Create "reduce" method -

(I) Create "remove" method -

(J) Create "display" method -

"lvm.py" python is successfully developed.

Now who want to automate LVM then they can use this python code. & We don't need to interact directly with LVM command. We can use this python program.

<<** Automate LVM Using "lvm.py" **>>

* To automate LVM I will write a python program in "AutomateLVM.py" file.

Step -1 Take Input That in which ( Volume Group & Logical Volume ) user want to perform operation -

> 1 ---------- One is for Volume Group

> 2 ---------- Two is for Logical Volume

> 3 ---------- Three is for break from while last outer while loop

Step - 2 Operations For Volume Groups -

> Operation 'A' to 'E'

> Operation 'F' to 'I'

Step - 3 Operations For Logical Volume -

> Operations 'A' to 'E'

> Operations 'F' to 'I'

Step - 4 Break From Outer While loop & Clear Screen -

<<** Run "AutomateLVM.py" **>

* First I will perform operation for Volume Group.

1) For Volume Group -

(a) "arth" Volume Group -

> Create "arth"

> Display Information About Volume Group -

> Extend Volume Group -

> Exit 'I' -

> Create New Volume Group "lv3" -

> Merge "arth" into "lv3"

> Reduce "lv3" ('/dev/sdd') -

> Rename Volume Group "lv3" to "task" -

> Remove "task" -

2) For Logical Volume -

> Create "VG" -

> "lv1" Logical Volume in Volume Group "VG"

> Create "lv1"

> Display "lv1" Information -

> Format "lv1"

> Mount "lv1" at "/root/LVM/k/" -

> Unmount "lv1"

> Display Information -

> Extend "lv1"

> Reduce "lv1" -

> Remove "lv1" -

Now our Task is successfully completed.

Thank you for giving your time to this Article.