deb_prepare.txt

A note on system that is installed on sd-card.

On SD Card there is clean Debian 7 Wheezy, and some improvements:

* /tmp is mounted on tmpfs (RAM) to speed up and carry on card
* kernel and libc and openssh is HOLD in aptitude to prevent from segfaults in pthread.so when updating system

After this, the system uses about 35 of 256 of RAM

root@coderdojo-galileo:~# free -m
             total       used       free     shared    buffers     cached
Mem:           226         33        193          0          2         18
-/+ buffers/cache:         12        214
Swap:            0          0          0



* card 2GB image has 3 partitions on it (as in pictures/sd_card_partition.png)

                                GNU cfdisk 1.2.4

                                    SD SD02G
        Disk: /dev/mmcblk0   Disk type: gpt    Size: 1967128575B, 1967MB
              Heads: 255   Sectors per track: 63   Cylinders: 239

   Number   Flags      Part Type   Filesystem        Label                Size
 ------------------------------------------------------------------------------
      1     Bootable   Primary     fat16                                  100MB
      2                Primary     ext3                                  1600MB
      3                Primary     ext3                                   266MB
                       Primary     Free space                            1.03MB


Special files for partitions on /dev subsystem:

brw-rw---T 1 root floppy 179, 0 mar 30 18:36 /dev/mmcblk0
brw-rw---T 1 root floppy 179, 1 sty  1  2001 /dev/mmcblk0p1
brw-rw---T 1 root floppy 179, 2 sty  1  2001 /dev/mmcblk0p2
brw-rw---T 1 root floppy 179, 3 sty  1  2001 /dev/mmcblk0p3


What you (as teacher with stidens) can do is:

* change the name of system ( vim /etc/hostname )
* make another partition on SD CARD mount in somewhere, in example /opt ( vim /etc/fstab )

After that operation you will have additional space for data (ex. rrd files in /opt)

root@coderdojo-galileo:~# df -h
System plików  rozm. użyte dost. %uż. zamont. na
rootfs          1,5G  480M  949M  34% /
udev             10M     0   10M   0% /dev
tmpfs            23M  108K   23M   1% /run
/dev/mmcblk0p2  1,5G  480M  949M  34% /
tmpfs           5,0M     0  5,0M   0% /run/lock
tmpfs            46M     0   46M   0% /run/shm
tmpfs           114M     0  114M   0% /tmp
/dev/mmcblk0p3  246M  6,1M  228M   3% /opt

Root password is: root ;-)

What you must do is:

* install all neccesary software for our project ( deb_install.sh )