Linux: Difference between revisions

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put list of commands in a table
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=== Physical volume ===
=== Physical volume ===


Initialize for use as LVM physical volume.
{| class="wikitable" border="1" style="border-collapse:collapse"
 
! style="text-align: center;"| Description
<source lang="bash">
! Command
$ pvcreate /dev/sdb1
|-
</source>
| Initialize for use as LVM physical volume.
 
| <code>pvcreate /dev/sdb1</code>
Scanning for block devices.
|-
 
| Scanning for block devices.
<source lang="bash">
| <code>lvmdiskscan</code>
$ lvmdiskscan
|-
</source>
| Display the physical volumes.
 
| <code>pvdisplay</code>
Display the physical volumes.
|-
 
| Show all physical devices.
<source lang="bash">
| <code>pvscan</code>
$ pvdisplay
|-
</source>
| Prevent allocation of physical extents on the free space of one or more physical volumes.
 
| <code>pvchange -x n /dev/sdb1</code>
Show all physical devices.
|-
 
| Resize.
<source lang="bash">
| <code>pvresize</code>
$ pvscan
|-
</source>
| Remove LVM label.
 
| <code>pvremove</code>
Prevent allocation of physical extents on the free space of one or more physical volumes. This may be necessary if there are disk errors, or if you will be removing the physical volume.
|}
 
<source lang="bash">
$ pvchange -x n /dev/sdb1
</source>
 
Resize.
 
<source lang="bash">
$ pvresize
</source>
 
Remove LVM label.
 
<source lang="bash">
$ pvremove
</source>


=== Volume group ===
=== Volume group ===


Create a volume group.
{| class="wikitable" border="1" style="border-collapse:collapse"
 
! style="text-align: center;"| Description
<source lang="bash">
! Command
$ vgcreate vg1 /dev/sdb1 /dev/sdc1
|-
</source>
| Create a volume group.
 
| <code>vgcreate vg1 /dev/sdb1 /dev/sdc1</code>
Add a physical volume to a volume group.
|-
 
| Add a physical volume to a volume group.
<source lang="bash">
| <code>vgextend vg1 /dev/sdd1</code>
$ vgextend vg1 /dev/sdd1
|-
</source>
| Display volume group.
 
| <code>vgdisplay new_vg</code>
Display volume group.
|-
 
| Scan disks for volume groups.
<source lang="bash">
| <code>vgscan</code>
$ vgdisplay new_vg
|-
</source>
| Remove a physical volume from a volume group.
 
| <code>vgreduce group_name /dev/sdc1</code>
Scan disks for volume groups.
|-
 
| Change the maximum number of logical volumes of volume group vg00 to 128.
<source lang="bash">
| <code>vgchange -l 128 /dev/vg00</code>
$ vgscan
|-
</source>
| Activate or deactivate a volume group.
 
| <code>vgchange -a n my_volume_group</code>
Remove a physical volume from a volume group.
|-
 
| Remove a volume group.
<source lang="bash">
| <code>vgremove officevg</code>
$ vgreduce group_name /dev/sdc1
|-
</source>
| Split the physical volumes of a volume group and create a new volume group.
 
| <code>$ vgsplit bigvg smallvg /dev/ram15<br>Volume group "smallvg" successfully split from "bigvg"</code>
Change parameters of a volume group. Change the maximum number of logical volumes of volume group vg00 to 128.
|-
 
| Merge the inactive volume group my_vg into the active or inactive volume group databases giving verbose runtime information.
<source lang="bash">
| <code>vgmerge -v databases my_vg</code>
$ vgchange -l 128 /dev/vg00
|-
</source>
| Change the name of a volume group.
 
| <code>vgrename vg02 my_volume_group</code>
Activate or deactivate a volume group.
|}
 
<source lang="bash">
$ vgchange -a n my_volume_group
</source>
 
Remove a volume group.
 
<source lang="bash">
$ vgremove officevg
</source>
 
Split the physical volumes of a volume group and create a new volume group.
 
<source lang="bash">
$ vgsplit bigvg smallvg /dev/ram15
Volume group "smallvg" successfully split from "bigvg"  
</source>
 
Merge the inactive volume group my_vg into the active or inactive volume group databases giving verbose runtime information.
 
<source lang="bash">
$ vgmerge -v databases my_vg
</source>
 
Change the name of a volume group.
 
<source lang="bash">
$ vgrename vg02 my_volume_group
</source>


= File =
= File =

Revision as of 18:21, 2 April 2018


SSH

Description Command
Create private/public SSH key file using 2048 bit encryption and with a comment. The command creates files under ~/.ssh folder. ssh-keygen -b 2048 -C user@host.domain
Push public SSH key to a server ssh-copy-id -p 41111 -i ~/.ssh/id_rsa.pub mhan@remote.server.com

Disk

LVM

Physical volume

Description Command
Initialize for use as LVM physical volume. pvcreate /dev/sdb1
Scanning for block devices. lvmdiskscan
Display the physical volumes. pvdisplay
Show all physical devices. pvscan
Prevent allocation of physical extents on the free space of one or more physical volumes. pvchange -x n /dev/sdb1
Resize. pvresize
Remove LVM label. pvremove

Volume group

Description Command
Create a volume group. vgcreate vg1 /dev/sdb1 /dev/sdc1
Add a physical volume to a volume group. vgextend vg1 /dev/sdd1
Display volume group. vgdisplay new_vg
Scan disks for volume groups. vgscan
Remove a physical volume from a volume group. vgreduce group_name /dev/sdc1
Change the maximum number of logical volumes of volume group vg00 to 128. vgchange -l 128 /dev/vg00
Activate or deactivate a volume group. vgchange -a n my_volume_group
Remove a volume group. vgremove officevg
Split the physical volumes of a volume group and create a new volume group. $ vgsplit bigvg smallvg /dev/ram15
Volume group "smallvg" successfully split from "bigvg"
Merge the inactive volume group my_vg into the active or inactive volume group databases giving verbose runtime information. vgmerge -v databases my_vg
Change the name of a volume group. vgrename vg02 my_volume_group

File

Permissions

Letter Number
r 4
w 2
x 1
rw- 6
r-x 5
rwx 7
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