Exercise 4

1. If you have anything valuable in KONE2, save it. Otherwise, nuke the VM.
2. Login to lonka_N+1, where lonka_N is your home lonka (or lonka5 if N=8). Start a new log in that lonka. (Optional) make a note in the old KONE2 log that the machine has been removed and reinstalled in another location.
3. Reinstall in similiar manner as the previous install of KONE2. Differences below:
4. 5G disk.
5. Virt-install arguments: Replace xenial with bionic in the installer URL, and add priority=low in kernel arguments (to enable expert mode). Replace bridge=br0 with network=default.
6. Network settings: No autoconfiguration. For IP address, choose 192.168.12X.NNN, where X is the number of your (different) lonka and NNN is the last octet of your KONE2 address. Check the netmask from lonka's routing settings. (ip r)
7. Proxy: http://192.168.12N.1:3142/
8. LVM with following partition table:

   LV	Size	FS	Mount point	Details
   lvroot	1G	ext4	/
   lvusr	1G	ext4	/usr	Typical use news
   lvvar	800M	xfs	/var
   lvtmp	100M	ext2	/tmp
   lvhome	1G	ext4	/home
   lvswap1	1G	swap

9. At the end of the installer, after GRUB is installed, open a shell and chroot into the installed system (chroot /target sh). Enable serial console right away (systemctl enable serial-getty@ttyS0). Exit the shell and finish the installation after that.

1. Setup Kerberos and users. (Using a backup or scp, doesn't matter.)
2. Move disk out of /ramdisk.
3. Update system. Check free disk space.
4. Reduce RAM to 256M. Reboot.

• Create a 1G image and attach it to KONE2. Create a new PV and a new VG on that. Name it TUNNUS-backups-vg.

Move the zero account (TUNNUS0) directly to filesystem root (/TUNNUS0) and change its uid to 999. usermod refuses to change these details of a logged in user. You can work around this by using the normal account

• What is the origin of the name of the command grep?
• Find the config file where apt's proxy information is stored in /etc. Recursive grep (grep -r) can be very useful here.
• How can you find all addresses of form 192.168.12X.NNN in /etc? Write the command and analyze the found addresses in your log.

• Shrink swap partition down to 500MB (swapoff, lvresize, mkswap, swapon). Check disk space before and after.