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45 Cards in this Set
- Front
- Back
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To mount another VG from another system to your new system
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echo "0 1 0" /sys/class/scsi_host/host0/scan
vgexport vg_humu vgimport vg_humu vgchange -ay vg_humu mount /dev/vg_humu/LogVol00 /humu |
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What two tools are used to create and manage partitions?
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fdisk
parted |
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How do you mount all swap files in /etc/fstab?
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swapon -a
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How do you see all active swap files?
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swapon -s
-or- cat /proc/swaps |
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Encrypted Filesystem Setup
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Build and Format Partitions
fdisk /dev/sdb cryptsetup luksFormat /dev/sdb1 cryptsetup luksOpen /dev/sdb1 testcrypt mkfs -t ext4 /dev/mapper/testcrypt Update the tabs and make the /t Run blkid and get the UUID of crypted drive and copy edit /etc/crypttab and add "testcrypt /dev/disk/by-uuid/{paste UUID} /root/testcrypt_passkey" (This will map to dev/mapper for you) add /dev/mapper/testcrypt /t ext4 defaults 1 0 (to fstab) mkdir /t Build the passkey and Add to the crypt grub-md5-crypt (copy hash) vi /root/testcrypt_passkey (paste hash) chmod 600 /root/testcrypt_passkey cryptsetup luksAddKey /dev/sdb1 /root/testcrypt_passkey reboot Leave rd_NO_LUKS in the kernel arguments in grub.conf to not prompt for password remove rd_NO_LUKS to prompt for password on boot |
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Build an LV from a newly installed 2 GB disk /dev/sdc
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fdisk /dev/sdc (change type to LVM whilst partitioning)
pvcreate /dev/sdc1 vgcreate vg_fish /dev/sdc1 lvcreate -L 1.99GB -n lv_fish vg_fish mkfs -t ext4 /dev/vg_fish/lv_fish mkdir /fish && mount /dev/vg_fish/lv_fish /fish df -h |
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What are the general steps to creating an LV from a blank disk?
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fdisk it to create partition
Create a PV Create a VG Create a LV Create a filesystem Make directory and mount said filesystem |
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What are the specific steps to extending an LV to an added disk?
/dev/sdb is the existing disk and /dev/sdc is the new disk |
fdisk /dev/sdc (use 8e)
pvcreate /dev/sdc1 vgextend vg_fish /dev/sdc1 lvextend -L+1.99GB -n /dev/vg_fish/lv_fish e2fsck -f /dev/vg_fish/lv_fish resize2fs /dev/vg_fish/lv_fish 2500M (this would only add 500 to the FS) |
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What are the general steps to extending an LV to an added disk?
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fdisk the new disk and use (8e)
pvcreate new partition (not the disk) vgextend lvextend e2fsck -f (or just fsck -f) resize2fs |
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How do you create a swap volume from new disk /dev/sdc?
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fdisk /dev/sdc (use 82)
mkswap /dev/sdc1 edit fstab swapon -a cat /proc/swaps (To see active swaps) |
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What are the two ways to format the filesystem format command?
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mkfs -t ext4
mkfs.ext4 |
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How do you convert a filesystem to ext3?
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tune2fs -j /dev/sdb1
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How do you convert a filesysten to ext4?
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Go to ext3 first, and unmount it
tune2fs -O extents,uninit_bg,dir_index /dev/sdb1 |
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How do you see active swap files?
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cat /proc/swaps
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What is /bin
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Essential Command line utilities.
Do Not mount seperately or you can't use a rescue disk |
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What is /dev
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Hardware and Software drivers
Do Not mount seperately |
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What is /etc
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Most basic configuration files
Do Not mount seperately |
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What is /home
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Home directories for all users except root
Can definitely mount seperately |
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What is /root
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Root's home directory
Do Not mount seperately like you can with /home |
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What is /lib
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Program libraries for the kernel and command line utilities
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What is /misc and /net
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Both automounter only directories
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What is /mnt
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A legacy mount point for removable media that grandpa used
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What is /opt
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Common location for third-party application files
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What is /proc
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Virtual filesystem in RAM with currently running kernel processes
You can't mount seperately |
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What is /sbin
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System administration commands
Do Not mount seperately |
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What is /tmp
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Deleted by Linux periodically
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What is /usr
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Small programs accessible to all users (sys admin commands and utils)
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Which 8 mounts should not ever be mounted seperately?
These should always be part of / |
/bin
/dev /etc /lib /proc /root /sbin /selinux |
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What are the different PV Commands (5)?
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pvdisplay (detailed PV list)
pvs or pvscan (simple PV list) pvcreate pvresize pvremove |
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What are the different VG commands (6)?
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vgdisplay (detailed VG list)
vgs or vgscan (simple VG list) vgcreate vgextend vgreduce vgremove |
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What are the different LV commands?
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lvdisplay (detailed LV list)
lvs or lvscan (simple LV list) lvcreate lvextend lvreduce lvremove lvresize |
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What are the common commands with relation to PV VG and LV?
All PV and LV only VG and LV only |
display
s or scan create remove resize (only PV and LV) extend (only VG and LV) reduce (only VG and LV) |
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Chart of PV VG and LV commands
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PV VG LV
display display display s or scan s or scan s or scan create create create remove remove remove resize resize extend extend reduce reduce |
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Chart of PV VG and LV commands
display s or scan create remove resize extend reduce |
PV VG LV
x x x x x x x x x x x x x x x x x x |
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How can you format the resize2fs command to not use all the
available space on a newly resized LV? |
resize2fs /dev/vg_test/lv_test 1900M
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In the fstab file, what are the valid filesystem types?
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ext, ext2, ext3, ext4, msdos, vfat, devpts, proc, tmpfs, udf, iso9660, nfs
smb, and swap |
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In the fstab, what do the two numbers 0 1 or whatever mean?
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The first is the dump value. 0 dumps it, 1 saves to disk upon exit of Linux
The second value is the filesystem check order. root 1 removable 0 All else 2 |
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What mount options are included in defaults in fstab?
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rw
suid dev exec auto Looks through /etc/filesystems for appropriate filesystem nouser Only root can mount the filesystem async |
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What are other options for mounting besides defaults in fstab?
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atime Updates inode time each time file is accessed
ro user (allows non root to mount filesystem, but also sets no suid, noexec, no dev) You cam add a no to most commands included in defaults as well |
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What are the two main virtual directories?
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/proc
/sys |
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How would you mount to an NFS datastore in fstab?
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nasshare1:/vol/ingenix /nas/sftp nfs rw,tcp,rsize=8192,wsize=8192,timeo=14,intr,upd 0 0
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How would you set up an SMB share in fstab?
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//server/pub /share cifs rw,username=user,password=pass 0 0
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How can you setup a samba mount is fstab with a secret password?
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With visible password
//server/pub /share cifs rw,username=user,password=pass 0 0 Without visible password //server/pub /share cifs rw,credentials=/etc/secret 0 0 make a file '/etc/secret and chmod it to 600 username=user password=password |
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With automounter, what are the five files?
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/etc/auto.master
/etc/auto.misc - Example mounts /etc/auto.home - for configuring home directories /etc/auto.net - NFS /etc/auto.smb - SMB |
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How do you activate the automounter?
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start the autofs service
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