isdn dialin syncppp 
Thursday, April 10, 2008, 10:07 - Network
Posted by Administrator
apt-get install isdnutils-base

because ippp0 sets a default route we change to ippp1:

mv /etc/isdn/device.ippp0 /etc/isdn/device.ippp1
mv /etc/isdn/ipppd.ippp0 /etc/isdn/ipppd.ippp1

/etc/isdn/device.ippp1 (remove '# REMOVE'):
LOCALMSN='XXXXX'
REMOTEMSN=
isdnctrl ihup ${device} on
isdnctrl secure ${device} off

/etc/isdn/ipppd.ippp1 (remove '# REMOVE'):
debug
name YYYYY

/etc/ppp/chap-secrets:
# client server secret IP addresses
YYYYY HOSTNAME PASSWORD ""


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Desktopsharing with vnc 
Wednesday, April 9, 2008, 13:23 - System
Posted by Administrator
sudo apt-get install vnc4-common vnc4

sudo vncpasswd /etc/vncpasswd

/etc/X11/xorg.conf:
Section "Module"
        Load     "vnc"
EndSection

Section "Screen"
        Option          "PasswordFile"    "/etc/vncpasswd"
EndSection



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Using a Flashdisk and take care about limited writes 
Tuesday, March 25, 2008, 11:23 - System
Posted by Administrator
For me it is sufficient to have data written every 20 Minutes.

To enable this i use laptop-mode and set some values in /etc/sysctrl.conf:

vm.swappiness = 0
vm.laptop_mode = 1200
vm.dirty_writeback_centisecs = 120000
vm.dirty_expire_centisecs = 120000
vm.dirty_ratio = 40
vm.dirty_background_ratio = 1


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Install minimal sid with cdebootstrap from ubuntu gutsy 
Saturday, March 22, 2008, 20:59 - Debian/Ubuntu
Posted by Administrator
To bootstrap debian sid on a second harddisk do following

* create partitions / filesystems

cfdisk /dev/hdc
mkfs.ext2 /dev/hdc1
mount -o rw,suid,dev /dev/hdc1 /mnt

mkswap -f /dev/hdc2
swapon /dev/hdc2

* bootstrap (with a deb proxy like approx)

cdebootstrap -v sid /mnt http://proxy:9999/debian

install cdebootstrap from hardy if something went wrong

wget [mirror]cdebootstrap_0.4.4ubuntu1_i386.deb
dpkg --force-all -i cdebootstrap_0.4.4ubuntu1_i386.deb

* enter chroot

mount --bind /proc /mnt/proc/
mount --bind /dev /mnt/dev

chroot /mnt
export LANG=C

* install kernel and bootloader

apt-get install grub linux-image-2.6.24-1-486

cat /etc/kernel-img.conf<<EOF
# Kernel Image management overrides
# See kernel-img.conf(5) for details
do_symlinks = yes
relative_links = yes
do_bootloader = no
do_bootfloppy = no
do_initrd = yes
link_in_boot = no
postinst_hook = update-grub
postrm_hook = update-grub
EOF

* config bootloader

echo "/dev/hdc1 / ext2 rw 0 0" > /etc/mtab
grub-install /dev/hdc
update-grub

change in /boot/grub/menu.lst root=/dev/hdc1 with UUID
sed "s|root=/dev/hdc1|root=UUID=$(/lib/udev/vol_id --uuid /dev/hdc1)|" /boot/grub/menu.lst

* create /etc/fstab

echo "UUID=$(/lib/udev/vol_id --uuid /dev/hdc1) / auto defaults,noatime 0 1" > /etc/fstab

echo "UUID=$(/lib/udev/vol_id --uuid /dev/hdc2) none swap sw 0 0" >> /etc/fstab

* add a user

shadowconfig on
adduser USERNAME

* setup network, timezone

echo "nameserver NAMESERVERIP" > /etc/resolv.conf
echo HOSTNAME >/etc/hostname
cat > /etc/network/interfaces <<EOF
auto lo eth0
iface lo inet loopback
iface eth0 inet dhcp
EOF

* individual configs

tzselect

/etc/default/rcS:
TMPTIME=0
SULOGIN=no
DELAYLOGIN=no
UTC=yes
VERBOSE=no
FSCKFIX=yes
RAMRUN=yes
RAMLOCK=yes

/etc/default/syslogd:
SYSLOGD="-m 0"

* cleanup

apt-get clean
apt-get install deborphan
apt-get remove --purge $(deborphan)

* search for unused packages

dpkg -l | grep ^ii | less

* remove unused packages

apt-get remove --purge aptitude cdebootstrap-helper-diverts laptop-detect nano tasksel-data tasksel vim-common vim-tiny

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digitemp with collectd 
Sunday, March 16, 2008, 12:24 - System
Posted by Administrator
I used following schematic



Additionally i connected three twisted pair wires with a 100 Ohm resistor. At the end of each wire a schottky diode reverse biased across the DS18S20 sensor against spikes is used.

At the moment i have 5 DS18S20 temperature sensors (inside, outside, heater back, heater, warmwater)

Initialising: digitemp -i -s /dev/ttyS0 -q -c /etc/digitemp.conf

Reading: digitemp -a -q -c /etc/digitemp.conf

Mar 16 12:44:06 Sensor 0 C: 20.94 F: 69.69
Mar 16 12:44:07 Sensor 1 C: 13.75 F: 56.75
Mar 16 12:44:09 Sensor 2 C: 28.69 F: 83.64
Mar 16 12:44:10 Sensor 3 C: 31.94 F: 89.49
Mar 16 12:44:11 Sensor 4 C: 48.75 F: 119.75

/etc/collectd.conf:
LoadPlugin exec
<Plugin exec> Exec "nobody:dialout" "/usr/bin/digitemp_DS9097" "-n0" "-d10" "-a" "-q" "-c/etc/digitemprc" "-oPUTVAL home/temp/temperature-%s interval=10 %N:%.2C"
</Plugin>

I had to make a patch for collectd that the exec plugin runs with user nobody and group dialout. Because user nobody's group is not dialout "setgroups" have to be called (add user nobody to /etc/groups dialout is only used if initgroups is called).

Also for digitemp i made a patch because i got sometimes 85 degrees (error condition) which are not correctly handled by digitemp:

Hi!

I discovered the use of wrong indexes:

These is your Indextable:

Temperature = scratchpad[1]
Sign = scratchpad[2]
TH = scratchpad[3]
TL = scratchpad[4]
Count Remain = scratchpad[7]
Count Per C = scratchpad[8]
CRC = scratchpad[9]


1. glitch condition

COUNT_PER_C is Index 8 and COUNT_REMAIN is Index 7

- if( (scratchpad[7] - scratchpad[6]) == 1 )
+ if( (scratchpad[8] - scratchpad[7]) == 1 )

2. Error Condition (85 Degrees)

- if( (scratchpad[4]==0xAA) &&
- (scratchpad[3]==0x00) &&
- (scratchpad[7]==0x0C) &&
- (scratchpad[8]==0x10)
+ if( (scratchpad[1]==0xAA) &&
+ (scratchpad[2]==0x00) &&
+ (scratchpad[7]==0x0C) &&
+ (scratchpad[8]==0x10) )

Also i think an Error Condition (85 Degrees) should be handled like a
CRC Error.


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