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Install phpMyAdmin on CentOs 6

Install phpMyAdmin on CentOs 6 and had interesting walkthrough of the installation

1. Get the latest copy of phpMyAdmin from sourceforge

wget http://downloads.sourceforge.net/project/phpmyadmin/phpMyAdmin/3.5.7/phpMyAdmin-3.5.7-english.tar.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fphpmyadmin%2Ffiles%2FphpMyAdmin%2F3.5.7%2F&ts=1361966494&use_mirror=jaist

2. Extract the files

tar -zxvf phpMyAdmin-3.5.7-english.tar.gz

3. move the extracted files to proper location

mv phpMyAdmin-3.5.7-english.tar.gz /var/www/html/phpmyadmin

4. cd /var/www/html/phpmyadmin

5. Make a copy of configuration files

cp config.sample.inc.php config.inc.php

6. Modify […]

Java Heap Dump and analyze

First get the Java Applications Process Id, one way to do this is with: jps

jmap -dump:format=b,file=dump.bin <javaProcessIdHere>

The size of the heap dump file will be same as the heap memory in use at the time the command is run. For large heap sizes this can take several minutes to run, and can stall (make […]

Traffic Calcuation for Tomcat and Apache

How many users can we handle? How many requests/second can we handle? How much bandwidth is needed to handle so many users or requests/second? How do i calculate these figures? How many (an application) servers do i need to handle this traffic?

Lets begin with a small example to understand how we arrive at […]

Solaris Add Defualt Route

netstat -nr

route delete default 192.168.1.251

ou can add default router temporarily by following command

route add default 192.168.10.249

You can add default router permanently by following commands

route -p add default 192.168.1.249

Or

echo 192.168.1.249 > /etc/defaultrouter

It will create /etc/defaultrouter file if not already available. Next time you restart you system 192.168.1.249 will […]

How to Install and Configure VNC Server

First you need to check for already installed VNC Server. You can check this by executing following command.

rpm -q vnc-server

If you found message like  “package vnc-server is not installe” then you need to install it first by executing following command from root user.

yum install vnc-server

Once VNC Server installed you need to […]

Starting the DB2 control center on Linux

To start the DB2 control center, perform the following steps:

Login as root. At the command line, run the following command: xhost +localhost. Run the following command su – ctginst1. Run the following command db2cc.

Convert VirtualBox VDI to VMware VMDK disks

VBoxManage

We have used VBoxManage to clone VirtualBox disks. The method here is identical, except that we will be converting to a different disk format. Let’s see how this is done.

VBoxManage clonehd source.vdi target.vmdk –format VMDK

Where source is your VirtualBox disk, target is your VMware disk and –format VMDK is the desired output format. Similarly, […]

Linux commands for Reference

find . -type f -exec grep ‘NMX_FXNG_AND_CONTRACT_DBF’ {} \;

history

 history|awk ‘{print $2}’|awk ‘BEGIN {FS=”|”} {print $1}’|sort|uniq -c|sort -r

 history|tail -1000|awk ‘{print $2}’|awk ‘BEGIN {FS=”|”} {print $1}’|sort|uniq -c|sort -r

-daystart    This flag starts at the beginning of the day.-atime    The time the file was last accessed — in number of days.-ctime    The time the file’s […]

start/stop asterisk

To start asterisk server /usr/sbin/asterisk

To stop asterisk server /usr/sbin/asterisk -r CLI>stop now

To reload asterisk server CLI>reload

To restart asterisk server CLI>restart now

asterisk –rx “stop now”

To show version

asterisk -rx “core show version”

 

asterisk –rx “core show translation”

asterisk –rx “core show codecs”

 

YUM Server in CentOS 6.x / RHEL 6.x

Setup Local YUM Server in CentOS 6.x / RHEL 6.x

(Yum) is a software package manager that installs, updates and removes packages on RPM-based Linux distributions. Yum makes it easier to maintain groups of machines without having to manually update each one using rpm.

Features:

Support for multiple repositories.Simple configuration.Automatic dependency calculation.Fast operation.RPM-consistent behavior.Package […]

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