Deisz Tech Blog

Archive for the ‘Linux’ Category

To null out log  /var/tmp/mond.log

Run:  cp /dev/null /var/tmp/mond.log

All the content of the log file will be removed

If log is in use.. you can do this:

Send a SIGSTOP signal to the process which you want to pause/stop, copy the log files to target directory and finally issue a SIGCONT signal to the same process.

It seems to happen often enough that I had to note this

If your in WebSphere counsole and stop your JVM but it doesn’t go down, or it partially goes down.. Open a command line on the server

If the JVM is called: server1

run this:  ps -ef|grep server1

Then find the processID and run:  kill -9 (procID)

I found an OpenSource project called Clonezilla (http://clonezilla.org/). This software does essentially the same thing as Norton Ghost, and there is also a version than can do distributed cloning (such as doing an install for a computer lab).

5.2.16. /proc/loadavg This file provides a look at the load average in regard to both the CPU and IO over time, as well as additional data used by uptime and other commands. A sample /proc/loadavg file looks similar to the following:

0.20 0.18 0.12 1/80 11206

The first three columns measure CPU and IO utilization of the last one, five, and 10 minute periods. The fourth column shows the number of currently running processes and the total number of processes. The last column displays the last process ID used.

good link to explain load:

Redhat asked for the below 3 reports to help resolve:

• top -n 500 -b -d 1 > /tmp/top.txt&      (top)
• vmstat 1 500 > /tmp/vm.txt&              (vm info)
• iostat -x 1 500 > /tmp/io.txt&               (io)

This will remove the xxx.tar.gz and leave you with the xxx.tar

• gunzip xxx.tar.gz

Then this will remove all the files from the tar, leaving the xxx.tar (make sure you run this in the folder you want the files at)

• tar -xvvf xxx.tar

less /proc/cpuinfo

cat /etc/red*