Installing Debian

Assumptions: The server has two identically sized hard drives

Ideally - you should boot using a Debian installer that uses the serial console. If you can't - just install the normal way.

Prepare your laptop - Screen

• Install screen on your debian laptop:

$ sudo apt-get install screen

• Connect your serial cable (or USB - serial cable) from your laptop to the server. You may want to check dmesg after plugging in the cable to see which device is being used. You should have a line along the lines of: usb 3-1: PL-2303 converter now attached to ttyUSB0

• Start screen with:

  mkdir screen-log
  cd screen-log
  screen -L /dev/ttyUSB0 115200
  

Install Linux

Initial steps

• Put in Daniel's Serial Console debian installer and boot (note - if you don't have a serial installer, use a normal installer and a keyboard and monitor attached to the server).

• At the boot prompt hit enter to install the 2.6 kernel

• [Skipping easy steps]

• Manually partition the drive

• There should be two drives. Remove any existing partitions.

• Add one partition on each disk that is:

  # bootable
  # 250 MB
  # Physical volume for RAID array
  

• Add a second parition on each disk that is:

  # Takes up remaining space
  # Physical volume for RAID array
  

• Choose "Congifure software RAID"

• Choose "Create MD Device"

• Choose RAID1

• Number of active devices: 2

• Number of spare devices: 0

• Now select the first partition on each device.

• Click Continue. Repeat for second partition on each device.

• When you are done, click Finish. Now you are back at the partition menu.

• Scroll down to the raid devices. Modify as follows:

250 MB RAID device: Filesystem: ext3, mount on /boot
Remaining: Physical Volume for LVM

• Choose "Congifure LVM"

• Create a volume group called vg_nameofserver0

• Create a logical volumes in this volume group

dom0: 1 GB
dom0-swap: 512MB

• After returning to the main disk config menu, click on the LVM #1 and configure it to use ext3 and /.

• Click on the #2 lvm disk and configure it as swap

Afer reboot

• Set Hardware clock to GMT (even if it isn't)

• Insert root password into pass db

• Create new user: mayfirst

• Do not select any of the pre-set application packages. Just tab to OK.

• For mail congiration - choose No configuration (we will be installing postfix later)

• Root and postmaster recipient: root@…

Post Install

Syn Cookies ===

• Enable syncookies:

 echo 1 > /proc/sys/net/ipv4/tcp_syncookies

• Preserve syncookies on reboot:

  echo 'net.ipv4.tcp_syncookies=1' >> /etc/sysctl.conf
  

Setup xen

• Install with:

apt-get install xen-hypervisor-3.0.3-1-i386 xen-linux-system-2.6.18-4-xen-686 libc6-xen

• Edit /boot/grub/menu.1st

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=dom0_mem=131072

• run update-grub and reboot

• Install bridge-utils and xen-tools

  aptitude install bridge-utils xen-tools
  /etc/init.d/xend restart
  

• Edit /etc/xen-tools/xen-tools.conf. Apply the following diffs:

  0 gramsci:/etc/xen-tools# diff -u xen-tools.conf.orig xen-tools.conf
  --- xen-tools.conf.orig 2007-05-27 19:59:38.000000000 -0400
  +++ xen-tools.conf      2007-05-27 20:01:15.000000000 -0400
  @@ -35,6 +35,7 @@
  #
  ##
  # lvm = skx-vg
  +lvm = vg_gramsci0
  
  
  #
  @@ -61,7 +62,7 @@
  ##
  #
  # copy = /path/to/pristine/image
  -# debootstrap = 1
  +debootstrap = 1
  # rpmstrap = 1
  # tar = /path/to/img.tar
  #
  @@ -95,7 +96,7 @@
  swap   = 128Mb    # Swap size
  # noswap = 1      # Don't use swap at all for the new system.
  fs     = ext3     # use the EXT3 filesystem for the disk image.
  -dist   = sarge    # Default distribution to install.
  +dist   = etch     # Default distribution to install.
  image  = sparse   # Specify sparse vs. full disk images.
  
  #
  @@ -154,8 +155,8 @@
  #
  # Default kernel and ramdisk to use for the virtual servers
  #
  -kernel = /boot/vmlinuz-2.6.16-2-xen-686
  -initrd = /boot/initrd.img-2.6.16-2-xen-686
  +kernel = /boot/vmlinuz-2.6.18-4-xen-686
  +initrd = /boot/initrd.img-2.6.18-4-xen-686
  
  #
  #  The architecture to use when using debootstrap or rpmstrap.
  1 gramsci:/etc/xen-tools#
  

• Create new xen instances with:

xen-create-image --size=5Gb --swap=512Mb --gateway=209.51.180.17 --netmask=255.2
55.255.240 --ip=209.51.180.24 --hostname=mendes

Change settings as needed.

Misc

• Edit /etc/group and change the group id of mayfirst to 1500 (so it will be consistent with red)

• Login as root and install the following packages:

# apt-get install --purge ssh ntpdate ntp-server sudo vim less rsync postfix

• Add the group wheel.

# addgroup wheel

• Add mayfirst to wheel:

# addgroup mayfirst wheel

• Configure sudo:

  # visudo
  

Add a line at the bottom that says:

%wheel	ALL=(ALL) ALL

• Upload the mayfirst public keys to:

 .ssh/authorized_keys

• Configure ssh to only accept connections with auth keys (unless this is a server that should be accessible by members). Edit /etc/ssh/sshd_config.

• Uncomment and change the ChallengeResponseAuthentication line to match the following:

ChallengeResponseAuthentication no

• Reload ssh:

# /etc/init.d/ssh reload

• Uninstall unecesary packages:

$ sudo apt-get remove --purge portmap lpr nfs-common ppp

• Make sure no uneeded services are running. Look through /etc/rc2.d. Move from S to K any services that are not needed (e.g. rsync and inetd).

Serial console login

If you did not use the serial console installer, then perform the following:

• Edit the /etc/inittab file. Uncomment the line that reads:

T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100

and change 9600 to 115200 so it reads:

T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100

• Refresh:

$ sudo init q

• Add the following lines after the timeout line in /boot/grub/menu.1st

serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console

• Add the following lies to the Start Default Options

You should already have a line such as:

# kopt=root=/dev/md0 ro

add to it, so that your final line says:

# kopt=root=/dev/md0 ro console=ttyS0,115200n8

Refresh grub:

$ sudo update-grub

Encrypted File system

• Install programs:

$ sudo apt-get install dmsetup cryptsetup

• Create an encrypted file system for members:

• Now, unmount the partition (make sure there is no data on it that you care about).

$ sudo umount /home/members

• Create the encrypted filesystem:

$ cryptsetup luksFormat /dev/mapper/vg_NAMEOFSERVER0-members

You will be prompted for a password. Put password in resource db!

• Add to crypttab

echo crypt_members /dev/mapper/vg_NAMEOFSERVER0-members none luks >> /etc/crypttab

• Start it

/etc/init.d/cryptdisks start

• Create a file system on the partition:

$ mkfs -t ext3 /dev/mapper/crypt_members

• Remove cryptdisks from the rc2.d directory - we do not want this to start automatically on boot! Instead we want to start it manually so the boot process doesn't hang waiting for a password.