change linux process priority with nice and renice

2009-12-03

Process priorities are set between 20 (lowest) and -19 (highest)

To launch a task with a priority of 5 try:
mike@mikebox:~$ sudo nice task 5

If you're laptop is overehating and kacpi_notify is stealing all your CPU power polling the CPU temperature you can use renice to change priority of a running process (pid 20) to priority 5
mike@mikebox:~$ sudo renice 5 -p 20

nice Usage: nice [OPTION] [COMMAND [ARG]...]
Run COMMAND with an adjusted niceness, which affects process scheduling.
With no COMMAND, print the current niceness. Nicenesses range from
-20 (most favourable scheduling) to 19 (least favourable).

-n, --adjustment=N add integer N to the niceness (default 10)
--help display this help and exit
--version output version information and exit

find java path in ubuntu

2008-12-08

finding the java path in ubuntu is easy, just follow the links... most links live in /usr/bin so:

mike@mbox:/$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2008-12-07 22:16 /usr/bin/java -> /etc/alternatives/java

mike@mbox:/$ ls -l /etc/alternatives/java
lrwxrwxrwx 1 root root 40 2008-12-07 22:34 /etc/alternatives/java -> /usr/lib/jvm/java-6-openjdk/jre/bin/java

Telnet to Netgear Box

2008-09-04

To telnet to your Netgear box and play with all the onboard settings try the following

http://192.168.1.1/setup.cgi?todo=debug

where 192.168.1.1 is the IP of your router, then:
telnet 192.168.1.1
and you can play

adsl
adslctl
ash
ath_cli
ath_helper
atm
atm_monitor
atmarp
atmarpd
atmctl
br2684ctl
brctl
busybox
cat
cfm
chmod
cmd_agent_ap
conf
cp
crond
dd
dmesg
dnrd
dumpmem
echo
ez-ipupdate
free
fw-scripts/
grep
hostapd
ifconfig
init
insmod
iptables
iwconfig
iwpriv
kill
killall
klogd
lash
ln
ls
lsmod
mini_httpd
mkdir
more
mount
mv
nbtscan
netgear_ntp
nvram
pb_ap
ping
pot
potcounter
pppd
pppoe
pppoe-relay
ps
rc
reaim
reboot
restore_config.cgi
rm
rmmod
route
routed
rt2684d
scfgmgr
setmem
setup.cgi
sh
sleep
smtpc
syslogd
test
touch
udhcpc
udhcpd
umount
upgrade_flash.cgi
upnpd
utelnetd
wizard
wlanconfig

whois on linux

2008-06-19

installing whois on a linux box

# sudo apt-get install jwhois

# yum install jwhois

or

browse to: http://packages.qa.debian.org/j/jwhois.html

find the latest version and

# wget http://ftp.debian.org/debian/pool/main/j/jwhois/jwhois_4.0.orig.tar.gz

tar xf jwhois_4.0.orig.tar.gz

# cd jwhois_4.0/

# ./configure

# make install

get your environment variables / path with:

# env
:: PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

# cd /usr/local/bin

create a symbolic link so you can call whois url

# ln -s jwhois whois

then put the link in the path

# mv whois /usr/local/bin

Automatic Zimbra Backup

2008-03-10

If you are backing up Zimbra to a remote NFS file system then you should probably mount it in the fstab r the init.d - bear in mind that if the remote box cannot be found on boot or shutdown the machine will hang for ages before it times out.

#mounts remote file system #init.d
mount remoteBox:/email/backup /mnt/emailbackup/
#fstab
remoteBox:/email/backup /mnt/emailbackup/ nfs rw,intr,bg 0 0

Zimbra's own script
#!/bin/bash
export time=`date +%Y-%m-%d_%H-%M-%S`
export backup_dir=/var/spool/zimbra/backup
export backup_file=$backup_dir/zimbra$time.tar.gz
export zimbra_dir=/opt/zimbra
mkdir -p $backup_dir
su zimbra --command="/opt/zimbra/bin/zmcontrol stop"
tar -czvf $backup_file $zimbra_dir
su zimbra --command="/opt/zimbra/bin/zmcontrol start"

Zimbra Backup Script

Put this in /etc/cron.daily

#!/bin/sh
#deletes all files from remot drive older than 7 days
find /mnt/emailbackup/ -maxdepth 1 -ctime +7 -daystart -exec rm "{}" \;

#run back up
/opt/zimbra/bin/zmfullbackup > /var/spool/zimbra/backup/backup.log

#move back up to remote drive
mv /var/spool/zimbra/backup/* /mnt/emailbackup