add-swap-partition-in-centos.md

Add swap partition in CentOS7

1. Create new partition using fdisk /dev/sda with needed swap size
2. Change change partition type as LVM by partition code 8e using t option in fdisk
3. Save changes using w option
4. Reboot CentOS7
5. Create PV using pvcreate /dev/sdaX. 'X' will be newly created partition number.
6. Get VG name using vgdisplay
7. Extend VG size using vgextend centos /dev/sdaX
8. After extending VG size create Logical Volume using lvcreate centos -n swap -L 4G. Here, 'centos' in VG name and 'swap' is LV name
9. mkswap /dev/centos/swap. Here, '/dev/centos/swap' is LV path
10. Add swap partition details in vim /etc/fstab

/dev/centos/swap        swap                    swap    defaults        0 0

11. Execut swapon -va
12. Check swap size using free -h command.

Reference

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/deployment_guide/s1-swap-adding