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RH133_FilesystemManagement.md

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Partition Table Information

  • partition id
  • starting cylinder for partition
  • number of cylinders for partition

fdisk

  • fdisk -l /dev/sda
  • fisk /dev/sda
  • partprobe
  • mke2fs /dev/sdaX
  • dumpe2fs /dev/sdaX | less

e2label

  • e2albel /dev/sdaX data
  • e2label /dev/sdaX

Mount

  • mkdir /data
  • mount /dev/sdaX /data
  • mount
  • df -h
  • umount /data
  • e2label /dev/sdaX
  • mount -L /data /data L label
  • df -h

Mount Options

mount [-t vfstype] [-o options] device mount_point
-t vfstype(vfat,ext2,ext3,iso9660,etc.)
-o options
suid
dev
exec
auto
nouser
async
loop
ro
rw

Umount Filesystem

  • mount

  • umount /data

  • mount

  • umount /dev/sdaX

  • fuser -v /data

  • fuser -km /data

  • umount /data

  • mount -o remount,ro /data

Mount Example

  • mount /dev/sdaX /data

  • cp -a /usr/bin /data

  • cd /data/bin

  • ./whami

  • mount -o noexec /dev/sdaX /data

  • ca /data/bin

  • ./whami

  • midir /iso

  • mount -t iso9660 -o ro,loop boot.iso /iso

Connecting Network Resources

  • showmount -e 192.168.1.100

  • mkdir /mnt/nfs

  • mount 192.168.1.100:/var/ftp /mnt/nfs

  • smbclient -L 192.168.1.100 -N

  • mkdir /mnt/smb

  • mount //192.168.1.100/mskv /mnt/smb -o username=mskv%chinou

Managing Data:/etc/fatab

  • less /etc/fstab
    format:device mount_point FS_type options dump_freq fsck_order
    dump_freq:
    0:never 2:daily
    1:every other day,etc
    fsck_order:
    0:ignore
    1:first
    2:second
    ...

  • cp /etc/fstab /etc/fstab.bak

  • vim /etc/fstab

  • reboot

  • vim /etc/auto.master

  • lsattr

  • lsattr doc/

  • man chattr

  • echo "1 2 3 " > test

  • lsattr test

  • chattr +a test

  • echo "abc" > test

  • echo "abcd" >> test

  • chattr -a test

  • lsattr test

  • chattr =aAS test

  • chattr = test

Virtual Memory

SWAP:partion,file

Basic setup involves:

  1. crate swap partion
    fdisk /dev/sda
    n
    enter
    +100M
    m
    t
    lastnumber
    L
    82
    p
    w
    partprobe

  2. write special signature using mkswap
    mkswap /dev/sdaX

  3. add appropriate entries /etc/fstab
    vim /etc/fatab
    /dev/sdaX swap swap defaults 0 0

  4. active swap space with swapon -a swapon -s
    swapon -a
    swapon -s

check the swap partition status using swapon -s

using file for swap

  • dd if=/dev/zero of=/swapfile bs=1M count=100

  • ls -lh /swapfile

  • mkswap /swapfile

  • vim /etc/fstab as up exapmle

  • swapon -s

  • swapon -a

  • swapon -s

  • umount /data

  • fsck -y /dev/sdaX

  • tune2fs -j /dev/sdaX

  • umount /data

  • mount /dev/sdaX /data

  • df -h

  • dumpe2fs -h /dev/sdaX

Adding Drive