View source for Talk:OPS235 Lab 4 - Fedora17


= State when starting Lab 4 =

When the students are done lab 3, they should have:

* fedora1

  This VM has a GUI and no free space in the VG.
 
  VG         #PV #LV #SN Attr   VSize VFree
  vg_fedora1   1   2   0 wz--n- 9.80G    0 
 
  LV      VG         Attr   LSize   
  lv_root vg_fedora1 -wi-ao   8.83G                                      
  lv_swap vg_fedora1 -wi-ao 992.00M                                      
 
  PV         VG         Fmt  Attr PSize PFree
  /dev/vda2  vg_fedora1 lvm2 a-   9.80G    0 

* fedora2

  This VM has a GUI and free space in the VG.
 
  VG         #PV #LV #SN Attr   VSize VFree
  vg_fedora2   1   3   0 wz--n- 9.80G 3.95G
 
  LV      VG         Attr   LSize    
  lv_home vg_fedora2 -wi-ao 1000.00M                                      
  lv_root vg_fedora2 -wi-ao    3.91G                                      
  lv_swap vg_fedora2 -wi-ao  992.00M                                      
 
  PV         VG         Fmt  Attr PSize PFree
  /dev/vda2  vg_fedora2 lvm2 a-   9.80G 3.95G

* fedora3

  This VM has no GUI installed.
 
  VG         #PV #LV #SN Attr   VSize VFree
  vg_fedora3   1   3   0 wz--n- 9.80G 3.83G
 
  LV      VG         Attr   LSize   
  lv_home vg_fedora3 -wi-ao   1.00G                                      
  lv_root vg_fedora3 -wi-ao   4.00G                                      
  lv_swap vg_fedora3 -wi-ao 992.00M                                      
 
  PV         VG         Fmt  Attr PSize PFree
  /dev/vda2  vg_fedora3 lvm2 a-   9.80G 3.83G

* host (disk pack)

  Four PVs, minimum VG size 60G
  Single filesystem on vg_main/root, size 50G
  At least 10G available space in VG
 
  20% of disk space unallocated (min 15G)



= Recommendations for the revised Lab 4 =

== LVMs ==
* Start with the GUI tool, which may help them visualize what is happening.
* Continue with performing exactly the same operations on another VM using command-line tools.
* Next, the will add a second virtual disk to a VM and migrate /home to its own filesystem.
* On the real system (disk pack), they will add a partition as a PV and grow the root filesystem (minimal risk).
* They will then migrate a VM from its original virtual disk to a new, slightly larger virtual disk.

{{Admon/note|Recovering VMs|If the students encounter problems in Investigations 1-3 or 5, they can quickly restore their VM disk images from the backups created in Lab 3.}}

=== Investigation 1: How are LVMs managed using system-config-lvm? ===
* On fedora2, perform some LVM operations using the system-config-lvm graphical tool:
** Determine the current LVM configuration.
** Grow the home filesystem to 2G
** Create a new 2G LV containing an ext4 filesystem named lv_archive and mount it at /archive
** Backup /etc into /archive
** Shrink lv_archive to 1G
** Try shrinking / and observe that it is not permitted

=== Investigation 2: How are LVMs managed from the command line? ===
* Repeat the operations from Investigation 1, using fedora3 (command-line tools only):
** Determine the current LVM configuration.
** Grow the home filesystem to 2G (lvextend, resize2fs)
** Create a new 2G LV containing an ext4 filesystem and mount it at /archive (lvcreate, mkfs, mount, edit fstab, reboot to confirm automatic mount)
** Backup /etc into /archive
** Shrink lv_archive to 1G (umount, resize2fs, lvreduce, resize2fs, mount)
** Try shrinking / and observe that it is not permitted

=== Investigation 3: How can a PV be added to an existing VG? ===
* Provision fedora1 with an additional 5G virtual disk
* Add that virtual disk to the existing volume group
* Create lv_home (1G), and migrate /home onto it (lvcreate, mkfs, mount, mv, rm, umount, edit fstab, mount)

=== Investigation 4: How can I use LVM to manage storage on my disk pack? ===
* This investigation will have less-detailed instructions -- they students should be able to apply and adapt what they learned in the first three investigations.
* On the host (disk pack):
** Create a new logical partition (minimum 5G, leaving at least 10G free space in the extended partition)
** Add that partition as a PV into the existing VG
** Grow the root filesystem to fill the available space (this will provide sufficient space for Investigation 5)



== Package Management ==

* Keep existing content.

== User/Group Management ==

* Keep existing content, add a requirement to create their Matrix user on fedora3 (forcing use of command-line tools).