###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
RH135-6-simple-fs
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