4_configure_local_storage.md

objectives: 4_configure_local_storage

####List, create, delete partions on MBR and GPT disks

• fdisk -l - list all partitions
• fdisk /dev/vda - create a new primary partition
• [n] - for new partition
• [p] - primary
• (1-4) - partition number
• <size/sector> - choose appropriate sizing
• [t] - filesystem type, 8e for LVM, 82 for swap
• [w] - save the partition changes
• partprobe - force kernel to read updated partition table
• mkfs.ext4 /dev/vda1 - format the disk for ext4
• mkfs.xfs /dev/vda2 - format the disk for xfs
• mkfs.vfat /dev/vda3 - format the disk for vfat
• mkdir /mnt/{ext4,xfs,vfat} - create mount points for each filesystem
• blkid /dev/vda[n] - retrieve UUID for appropriate partition
• update /etc/fstab with appopriate entry

#/etc/fstab
UUID='...' /dev/vda1 /mnt/ext4 ext4 defaults 0 2
UUID='...' /dev/vda2 /mnt/xfs xfs defaults 0 0
UUID='...' /dev/vda3 /mnt/vfat vfat defaults 0 0

• mount -a - mount all filesystems

####Create and remove physical volumes, assign physical volumes to volume groups, and create and delete logical volumes

• lsblk -a - display current block devices and configuration
• pvcreate /dev/vdb1 - create a physical volume
• vgcreate <vgname> -s 8m /dev/vdb1 - create volume group, set extant size (4m default, set to 8m)
• lvcreate -n <lvname> -L 25G <vgname> - create logical volume, assign name and size
• mkfs.xfs /dev/<vgname>/<lvname> - create filesystem (xfs) on logical volume
• mkdir /mnt/lvm - create mountpoint
• blkid /dev/<vgname>/<lvname - display UUID
• vi /etc/fstab - update fstab

UUID="..." /mnt/lvm xfs defaults 0 0
# or
/dev/vg1/lv1 /mnt/lvm xfs defaults 0 0

####Add swap to a system non-destructively

• lvcreate -L 1G -n <lv_swapname> <vgname> - create new logical volume for swap space
• mkswap /dev/<vgname>/<lv_swapname> - create swap
• swapon /dev/<vgname>/<lv_swapname> - activate swap
• swapon -s - verify swap summary
• vi /etc/fstab - update fstab
• /dev/vg/swap swap swap defaults 0 0 - entry