io scheduler for databases (deadline) 
Tuesday, June 17, 2008, 15:20 - System
Posted by Administrator
As suggested by http://www.nextre.it/oracledocs/oraclemyths.html
i put elevator=deadline to grubs menu.lst.

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atomic ops in c with help of gcc 
Monday, June 16, 2008, 13:51 - Programming
Posted by Administrator
atomic.h Read More...

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find PCs in a network 
Thursday, June 5, 2008, 10:51 - Network, Programming
Posted by Administrator
for i in $(seq 2 254); do ping -c 1 192.168.0.$i | grep -q rtt && echo "found 192.168.0.$i"; done

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kvm pxe boot 
Wednesday, June 4, 2008, 15:21 - System
Posted by Administrator
get a ISO bootable image without legacy floppy emulation (.iso) from etherboot

kvm.sh:
#!/bin/sh

switch=br0

USERID=$(whoami)
iface=$(sudo tunctl -b -u $USERID)

sudo /usr/sbin/brctl addbr $switch
sudo /sbin/ifconfig $switch 192.168.99.1 up

kvm -M pc -m 512 -smp 1 -cdrom eb-5.4.3-ns8390.iso \
    -boot d -net nic,model=rtl8139 \
    -net tap,vlan=0,ifname=$iface, \
     script=qemu-ifup,downscript=qemu-ifdown

sudo tunctl -d $iface &> /dev/null

sudo /sbin/ifconfig br0 down
sudo /usr/sbin/brctl delbr $switch
qemu-ifup:
#!/bin/sh

#!/bin/sh

switch=br0

if [ -n "$1" ];then
        echo "config $1"
        /usr/bin/sudo /sbin/ifconfig $1 0.0.0.0 promisc up
        /usr/bin/sudo /usr/sbin/brctl addif $switch $1
        exit 0
else
        echo "Error: no interface specified"
        exit 1
fi
qemu-ifdown:
#!/bin/sh

switch=br0

if [ -n "$1" ];then
        sudo tunctl -d $1
        sudo ifconfig $switch down
        exit 0
else
        echo "Error: no interface specified"
        exit 1
fi


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apparmor create a new profile 
Wednesday, May 28, 2008, 16:41 - Security
Posted by Administrator
aa-genprof can not connect to internet, therefore i do it manually

/etc/apparmor.d/usr.bin.program:
#include <tunables/global>
/usr/sbin/program flags=(complain) {
  #include <abstractions/base>
}

start program and use it

aa-logprof -f /var/log/syslog -m "STARTSCAN-TIMESTAMP FROM SYSLOG"

Answer the questions and save it.

if no audit logs occur remove "flags=(complain)"

reload a rule: apparmor_parser -r usr.bin.program

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