I am trying to run wireshark in linux using sudo, but was told: i am not in the sudoer files. So I must edit this file to add my own user into this file. Steps as follows:

1. su to root:  su-
 2. open sudoers:  visudo /etc/sudoers
3. add my user name:  testuser ALL=(ALL) NOPASSWD:ALL
    This lines means that the user "testuser" can execute from ALL terminals, acting as ALL (any) users, and run ALL (any) command.

The detail is in paper:  http://www.go2linux.org/sudoers-how-to






In order to supports internationalization (I18N), on Tomcat some additional configuration is necessary. You must
ensure that Tomcat's URI encoding is set to UTF-8. You can do this by editing the Tomcat configuration file
conf/server.xml and adding URIEncoding=”UTF-8” to each connector element, as shown below:

<Connector port="8080"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" debug="0"
acceptCount="100" connectionTimeout="20000"
disableUploadTimeout="true"
URIEncoding="UTF-8" />

And make sure you do this for every connectort. I planned to install Roller in my centOS which need tomcat6. But centos5.3 has tomcat5 in it's yum. So I have to install tomcat6 using other way. I searched and found this good install guide in:
     http://cloudservers.mosso.com/index.php/CentOS_-_Tomcat_6 ( or http://de0ris.blogspot.com/2008/08/installing-tomcat-6x-on-centos-5.html )
which give detail instructions. I choose some important part and paste here in case for late use.

1.  install appache ant:  （note： download and put the tar file in /usr/share first ）

   tar -xzf apache-ant-1.7.1-bin.tar.gz







2. install tomcat:（note： download and put the tar file in /usr/share first ）







tar -xzf apache-tomcat-6.0.18.tar.gz

3.  create a symbolic link for Ant so other applications can easily find it. Be sure to select the correct version when you create your link.

ln -s /usr/share/apache-ant-1.7.1/bin/ant /usr/bin

4. set JAVA_HOME:

cd /usr/share/apache-tomcat-6.0.18/bin



vi catalina.sh

enter insert mode. Enter the following:

JAVA_HOME=/usr/java/jdk1.6.0_14

Test:

cd /usr/share/apache-tomcat-6.0.18/bin



./startup.sh

5.Automating atartup:   Right now Tomcat will not start up on it's own so we need to create a startup script for this. To do this:

cd /etc/init.d



vi tomcat

Press i to enter insert mode and paste in the following:

#!/bin/bash



# chkconfig: 234 20 80



# description: Tomcat Server basic start/shutdown script



# processname: tomcat



JAVA_HOME=/usr/java/jdk1.6.0_14



export JAVA_HOME



TOMCAT_HOME=/usr/share/apache-tomcat-6.0.18/bin



START_TOMCAT=/usr/share/apache-tomcat-6.0.18/bin/startup.sh



STOP_TOMCAT=/usr/share/apache-tomcat-6.0.18/bin/shutdown.sh



start() {



echo -n "Starting tomcat: "



cd $TOMCAT_HOME



${START_TOMCAT}



echo "done."



}



stop() {



echo -n "Shutting down tomcat: "



cd $TOMCAT_HOME



${STOP_TOMCAT}



echo "done."



}



case "$1" in



start)



start



;;



stop)



stop



;;



restart)



stop



sleep 10



start



;;



*)



echo "Usage: $0 {start|stop|restart}"



esac



exit 0

Be sure to change the following items in the above file:



* JAVA_HOME path



* TOMCAT_HOME path



* START_TOMCAT path



* STOP_TOMCAT path

Once you have those changes made, save the file and quit.

Now we need to change the permissions on the file.

chmod 755 tomcat

We need to set the script to start with other system services and set the runlevels.

chkconfig --add tomcat



chkconfig --level 234 tomcat on

You can verify that it is listed by typing chkconfig --list tomcat.

tomcat         	0:off	1:off	2:on	3:on	4:on	5:off	6:off

Test your shutdown and startup script.

sudo /sbin/service tomcat stop



sudo /sbin/service tomcat start

Tomcat 6 should now be installed under CentOS.

    



1.Agile model driven development(AMDD): focus on model

2.Extreme programmning: focus on full development life cycle.

3.Jconsole: c:\program files\java\jdk1.6.0_14\bin\jconsole, which could dectect the memory issue, class loading, garbage collection...
一看書名就知道又是一本通俗易懂的書。果不其然，而且比想象的更有意思（我想是簡單的緣故吧）。

書里只是很簡單的提及了一些網絡的基本概念和運作原理，似乎各個方面都有覆蓋，但是因為描述的很淺顯，所以建議給：
1 想大致了解DNS，ARP，router等網絡知識的人；
2 有閑但是對于網絡感興趣的人；

其實不錯，無聊的時候翻翻，解悶！

centos

0. /sbin/ifconfig

1. mysql :

   *remove: yum -y remove mysql mysql-server
   *insatll: yum -y install mysql mysql-server
 
   *check: chkconfig --list | grep mysql
  
   *Set to Start on Boot:
       chkconfig mysqld on

   *start service:
       service --status-all
       service mysqld start
       check:  mysqladmin version    
 
   *setup root password:
    mysqladmin -u root password ***(this is new password)

    *run:
    mysql -u root -p

    *exit:
    \q

    *commands:ep t
    show databases;

    drop database ***;

2. Tomcat:

    *install:
        yum -y install tomcat5 tomcat5-webapps tomcat5-admin-webapps

    *You can find these packages using
        yum list available tomcat5*
        or
        yum search tomcat5

    *Start:
        service tomcat5 start
       
    view:   http://localhost:8080/.

    *location:r
         /usr/share/tomcat5 .
        *setting:
            "$CATALINA_HOME".

3. JDK:

     * Originally, centOS only install jre. so we need install jdk by ourselves.
     *To install from the command line:

$yum install java-1.6.0-openjdk-devel

You can also install all the OpenJDK 6 packages, including the API documentation, by using the wildcard java-1.6.0-openjdk*.

      *location:         /usr/lib/jvm...
      *check:  java -version