(B15) Linux Admin Part6 Disk Management 2 -fdisk,blkid,swap,mkswap
20220322 151428
fdisk /dev/sda
p
v
n
-enter
-enter
: +4G
p
7 184551424 192940031 4G Linux filesyste
v
t
: 7
: 20
Changed type of partition 'Linux filesystem' to 'Linux filesystem'
p
w
partprobe
partprobe /dev/sda
mkfs.ext4 /dev/sda7
mkdir /data7
ls -a /data7
mount /dev/sda7 /data7
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda6 2.0G 6.0M 1.8G 1% /data6
/dev/sda7 3.9G 16M 3.6G 1% /data7
ls -a /data7
. .. lost+found
touch /data7/f7{1..7}
ls -a /data7
. .. f71 f72 f73 f74 f75 f76 f77 lost+found
umount /data7
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda6 2.0G 6.0M 1.8G 1% /data6
ls -a /data7
. ..
mount /dev/sda7 /data7
ls -a /data7
. .. f71 f72 f73 f74 f75 f76 f77 lost+found
-----------------------------------------------------
the mounting is temporary
-on next boot , drive and dir unmounted
-on next boot , it wont mount automatically
permanent mount?
spacify mount information in /etc/fstab
umount /data6
vi /etc/fstab
/dev/sda6 /data6 ext4 defaults 0 0
mount /data6
or
mount -a
df -h
ls /data6
----------------------------
/dev/sda7 /data7 ext4
df -h
umount /data7
df -h
vi /etc/fstab
mount -a
vi /etc/fstab
df -h
-------------------------
there is possible the drive names like sda1 sda2 sdb1 sdb3..changes
when we reboot/next boot , system through error
unique id of parition/drives
blkid
blkid /dev/sda6
/dev/sda6: UUID="b1c884e4-25df-4c84-94de-87594e1d9823" TYPE="ext4" PARTUUID="ff71e264-2007-4386-8dca-098289fca13f"
----------------------------------------
update drive UUID in /etc/fstab
vi /etc/fstab
UUID=b1c884e4-25df-4c84-94de-87594e1d9823 /data6 ext4 defaults 0 0
---------------------------------------
blkid /dev/sda7
/dev/sda7: UUID="d98bed18-5a3c-48ac-84e8-58241934348d" TYPE="ext4" PARTUUID="2331f641-e18d-4423-8a82-2cd156cef822"
-----------------------------------------------------------------------------------------------
grep 'MemTotal' /proc/meminfo
MemTotal: 1862392 kB
grep 'SwapTotal' /proc/meminfo
SwapTotal: 4194300 kB
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
fdisk /dev/sda
: m
: p
: v
: n
Partition number:
First sector :
Last sector, +sectors or +size{K,M,G,T,P}: +2G
Created partition 8
: p
8 192940032 197134335 2G Linux filesyste
: t
Partition number: 8
Partition type: l
19 Linux swap
20 Linux filesystem
31 Linux LVM
Partition type: 19
Changed type of partition 'Linux filesystem' to 'Linux swap'
: p
8 192940032 197134335 2G Linux swap
: v
: w
partprobe
partprobe /dev/sda
mkswap /dev/sda8
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=0b0ed15e-c2c4-494f-bc8e-475dd3752493
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
swapon /dev/sda8
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
/dev/sda8 partition 2097148 0 -3
grep 'SwapTotal' /proc/meminfo
SwapTotal: 6291448 kB
swapoff /dev/sda8
grep 'SwapTotal' /proc/meminfo
SwapTotal: 4194300 kB
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
------------------------------------------------
add swap parition permanently
add details to /etc/fstab
blkid /dev/sda8
/dev/sda8: UUID="0b0ed15e-c2c4-494f-bc8e-475dd3752493" TYPE="swap" PARTUUID="0f1b937e-f72f-44b7-91db-bc3d1653ce02"
vi /etc/fstab
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
swapon -a
swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 4194300 0 -2
/dev/sda8 partition 2097148 0 -3
grep 'SwapTotal' /proc/meminfo
SwapTotal: 6291448 kB
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