###Swap Partitions & Files###
Features:
1. Extra, virtual RAM for the OS
Steps:
1. Identify current swap space
a. ''swapon -s'' - enumerates partitions and/or files, which constitute swap storage
b. ''free -m''
2. Select target drive and provision swap partition
a. ''fdisk /dev/sdb''
b. ''n''
c. ''2''
d. ''500''
e. '' 512M'' (cylinder 562) - 63 cylinders are required for 512MB
f. ''t'' - Change Type
g. ''82'' - Linux Swap/Solaris
h. ''w'' - committ changes to disk
3. Create the swap file system on the raw partition: /dev/sdb2
a. ''mkswap /dev/sdb2''
4. Enable swapping - publish the swap space to the kernel
a. ''swapon /dev/sdb2'' - this enables swapping on /dev/sdb2
5. update /etc/fstab
a. ''/dev/sdb2 swap swap defaults 0 0
swapoff /dev/sdb2 - disables swapping on /dev/sdb2
Task:
1. Improve system performance by distributing swapping to /dev/sdb2
a. swapon /dev/sdb2
b. swapoff /dev/sda6
c. disable /dev/sda6 via /etc/fstab
###Create Swap based on File###
Features:
1. The ability to provision swap space based on a file, similar to pagefile.sys in Windows NT, etc. if you have no available disk space to partition
2. Doesn''t waste partitions
Task:
1. Create 512MB swap file
a. ''dd if=/dev/zero of=/home1/swapfile1 bs=1024 count=524288''
b. ''mkswap /home1/swapfile1'' - overlays swap file system
c. ''swapon /home1/swapfile1'' - makes swap space available to the kernel
2. Ensure that when the system reboots, the swapfile is made available to the kernel
a. ''nano /etc/fstab'' - /home1/swapfile1 swap swap default 0 0
3. Create 2GB swap file
a. ''dd if=/dev/zero of=/home1/swapfile2 bs=1M count=2048''
###Encrypt a partition###
Features:
1. Encrypt a Partition
Tasks:
1. Create a partition
a. ''fdisk -cu /dev/vda''
2. Encrypt
a. ''cryptsetup luksFormat /dev/vda5''
3. Open
a. ''cryptsetup luksOpen /dev/vda5 encdisk''
4. Format
a. ''mkfs.ext4 /dev/mapper/encdisk''
5. Use
a. ''mkdir /encdisk''
b. ''mount /dev/mapper/encdisk /encdisk''
6. Auto-mount
a. Edit /etc/crypttab
encdisk /dev/vda5 /root/encdisk
b. ''echo westos > /root/encdisk''
c. ''chown root /root/encdisk
d. ''chmod 600 /root/encdisk
e. ''cryptsetup luksAddKey /dev/vda5 /root/encdisk
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