swap-on-lvm

1. Start the LinuxAcademy.com lab server and mount a new disk and ensure LVM utilities are installed on the system.

[root@localhost #] yum install lvm2

2. Create a partition that uses the entire disk space on /dev/xvdf.

[root@localhost dev]# fdisk /dev/xvdf Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table.

Building a new DOS disklabel with disk identifier 0x0631abd7.

Command (m for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): 

Using default response p

Partition number (1-4, default 1): 

First sector (2048-2097151, default 2048): 

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151): 

Using default value 2097151

Partition 1 of type Linux and of size 1023 MiB is set

Command (m for help): t

Selected partition 1

Hex code (type L to list all codes): 8e

Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

3. Create a physical volume and a new volume group named battlestar out of the /dev/xvdf1 partition.

[root@localhost #] pvcreate /dev/xvdf1

[root@localhost #] vgcreate battlestar /dev/xvdf1

4. Create a new LVM volume that is approximately 500M in size (generally you will want it to be 2 to 2.5 times
the size of your physical memory but this is a lab).

[root@localhost dev]# lvcreate -n swap -L 500M battlestar

5. Format the new LVM volume with a swap signature.

[root@loclhost dev] #  mkswap /dev/battlestar/swap

Setting up swapspace version 1, size = 511996 KiB

no label, UUID=679ea5a2-c652-458a-8726-6e3970d1f58f // (Note use your UUID provded not the one here)

6. Add an entry into the /etc/fstab file using the UUID of the LVM device to create a persistent swap mount.

#

# /etc/fstab

UUID=668dbd02-c201-44bc-be76-f606fc9ab8db /                       xfs     defaults        1 1

UUID=679ea5a2-c652-458a-8726-6e3970d1f58f swap swap defaults 0 0 

7. Run the swapon command that enables all swap entires in the /etc/fstab file.

[root@localhost dev]# swapon -a

8. Verify swap space is working.

[root@localhost dev]# free -m

or

[root@localhost dev]# swapon -s

[root@localhost dev]# cat /proc/swaps

9. Reboot and test.

[root@localhost dev]# reboot