[Cafe] Cafe server information

[Gareth Coleman]

Great work alan - and wow - documentation too!

You put us all to shame :)

love

gareth

On Sun, 2007-12-02 at 12:04 +0000, Alan Dawson wrote:
> Cafe Server progress
> 
> 0.  Server Name decided...  sevenhills
> 
> 1.  Debian Etch installed across mirrored disks
>     ToDo .. install grub to both mirrored disk MBR to give choice of booting
> from disk 1 or 2
> 
> 2.  Xen Virtualisation Hypervisor added to sevenhills
> 
> 3.  Xen Paravirtualised Debian Etch Server template built
> 
> 4.  Paravirtualised monitoring server added and set to run constantly. 
> Monitoring software used is munin.
>     Machine name is "munin"
>     As other virtual machines are added they should be set so that the
> monitoring box can poll them.
> 
>     Resources used by "munin"  64MB RAM 2.5G HDD
> 
> 5.  Second PV (paravirtual) server called "gareth".  Built from the Debian Etch
> Template.      
>     Resources used 1024MB Ram, 12G HDD ( see notes on altering disk size later
> )
> 
> 6.  Fully Virtualised server built.
>     Resources Used 4G HDD, 1024MB Ram
>     ... work in progress ...
> 
> static IP addresses for machines
> 
> sevenhills 192.168.1.200
> munin	192.168.1.201
> gareth 192.168.1.202
> 
> 
> http://monitoring graphs available at 
> http://192.168.1.201/munin/
>     
> 
> 
> 
> getting a graphical console on one of the virtual servers
> -----------------------------------------------------------
> 
> On a headless machine which we'd like to see use in a graphical way
> Edit /etc/gdm/gdm.conf
> add line under [XDMCP]
> Enable=true
> 
> On your workstation start gmdXnestchooser
> 
> Select the remote machine and login
> 
> 
> Resizing a disk
> ---------------
> 
> Server Gareth had initially a 2G HDD.  This isn't big enough to build a desktop
> environment really.
> 
> gareth:/var/cache/apt/archives# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/hda1             2.0G  1.5G  414M  79% /
> tmpfs                 513M     0  513M   0% /lib/init/rw
> udev                   10M   24K   10M   1% /dev
> tmpfs                 513M  4.0K  513M   1% /dev/shm
> 
> 
> So.. on host sevenhills show the logical volumes...
> 
> sevenhills:~# lvs
>   LV            VG          Attr   LSize   Origin Snap%  Move Log Copy%
>   FullVirt      XenMachines -wi-a-  10.00G
>   GarethRoot    XenMachines -wi-ao   2.00G
>   GarethSwap    XenMachines -wi-ao 512.00M
>   ISO           XenMachines -wi-ao   4.00G
>   MuninRoot     XenMachines -wi-ao   2.00G
>   MuninSwap     XenMachines -wi-ao 512.00M
>   XenFileImages XenMachines -wi-ao   4.00G
> 
> 
> we want to increase LV GarethRoot by 10G to 12G in size
> 
> sevenhills:~# lvextend -L +10G /dev/XenMachines/GarethRoot
>   Extending logical volume GarethRoot to 12.00 GB
> 
> OK.. now we need to tell PV machine gareth that its got more capacity
> 
> so reboot it - so it picks up a bigger disk
> 
> gareth:/var/cache/apt/archives# init 6
> gareth:/var/cache/apt/archives# Connection to 192.168.1.202 closed by remote
> host.
> Connection to 192.168.1.202 closed.
> 
> Log back in
> 
> aland at freedom:~$ ssh 192.168.1.202 -l root
> root at 192.168.1.202's password:
> Last login: Sun Dec  2 10:54:24 2007 from 192.168.1.26
> Linux gareth 2.6.18-5-xen-686 #1 SMP Wed Oct 3 04:02:16 UTC 2007 i686
> 
> The programs included with the Debian GNU/Linux system are free software;
> the exact distribution terms for each program are described in the
> individual files in /usr/share/doc/*/copyright.
> 
> Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
> permitted by applicable law.
> gareth:~#
> 
> online Resize the fs to the full available on the disk
> 
> 
> gareth:~# resize2fs /dev/hda1
> resize2fs 1.40-WIP (14-Nov-2006)
> Filesystem at /dev/hda1 is mounted on /; on-line resizing required
> old desc_blocks = 1, new_desc_blocks = 1
> Performing an on-line resize of /dev/hda1 to 3145728 (4k) blocks.
> The filesystem on /dev/hda1 is now 3145728 blocks long.
> 
>   Logical volume GarethRoot successfully resized
> 
> gareth:~# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/hda1              12G  1.9G  9.4G  17% /
> tmpfs                 513M     0  513M   0% /lib/init/rw
> udev                   10M   24K   10M   1% /dev
> tmpfs                 513M  4.0K  513M   1% /dev/shm
> 
> notice 12G disk now rather than 2G for /
> 
> 
> 
> As a suggestion for further investement if we have capacity ..  a pair of 500GB
> sata disks ?
> 
> 
> 
> 
> -- 
> "The long revolution is creating small federated microsocieties, true guerilla
> cells practising and fighting for this self-management. Effective radicality
> authorises all variations and guarantees every freedom"
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