Knowledge blog

2012-03-03T23:08:00.057-08:00

APT-PROXY Configuration
Apt-proxy is caching proxy can be easily install on ubuntu/debain. It will build up a partial debian mirror, and caches the packages in your hard drive it will behaves full http proxy server. In the case of missing packages the apt-proxy will fetch the missing package from internet and that will save your installation time and bandwidth, it's also clean the unused files based on user defined attributes in configuration file. apt-proxy is also accessible through ftp:// protocol.

Install proxy on your proxy server from any of debain/ubuntu mirror.

Install Apt-proxy
$> apt-get install apt-proxy

Open the apt-proxy configuration file which contains the default apt-proxy settings, Add mirrors in apt-proxy-v2.conf define the IP, PORT and cache-dir where you want to store download packages.

$> vi /etc/apt-proxy/apt-proxy-v2.conf

address 192.168.1.12
port = 9999;
cache-dir= “/var/cache/apt-proxy”
timeout = 30
passive_ftp = on

[ubuntu]
; Ubuntu archive
backends =
http://archive.ubuntu.com/ubuntu
http://de.archive.ubuntu.com/ubuntu
[ubuntu-security]
; Ubuntu security updates
backends = http://security.ubuntu.com/ubuntu
[debian] ; Backend servers, in order of preference
backends =
http://ftp.us.debian.org/debian
http://ftp.de.debian.org/debian
http://ftp2.de.debian.org/debian
ftp://ftp.uk.debian.org/debian
[debian-non-US]
; Debian debian-non-US archive
backends =
http://ftp.us.debian.org/debian-non-US
http://ftp.th.debian.org/debian-non-US
ftp://ftp.us.debian.org/debian
[security]
; Debian security archive
backends =
http://security.debian.org/debian-security
http://ftp2.de.debian.org/debian-security
[openoffice]
; OpenOffice.org packages
backends =
http://ftp.freenet.de/pub/debian-openoffice
http://ftp.sh.cvut.cz/MIRRORS/OpenOffice.deb
http://borft.student.utwente.nl/debian
[apt-proxy]
; Apt-proxy new versions
backends = http://apt-proxy.sourceforge.net/apt-proxy

Initializing apt-proxy
You’re apt-proxy is ready to use, to start/restart you’re apt-proxy server run

$> /etc/init.d/apt-proxy [start|restart]

Export HTTP_PROXY
If you are using http proxy to connect though internet you need to define the proxy setting in your server. To define the proxy settings you run

$> export http_proxy=http://username:password@myproxyserver:port/
$> export ftp_proxy=http://username:password@myproxyserver:port/

You need to export http proxy setting each time your server restarted to fix the add above lines in /etc/bash.bashrc file.

Client Setting
Edit source.list (/etc/apt/source.list) to use your proxy server instead of using internet.
Replace the existing mirrors

deb http://archive.ubuntu.com/ubuntu dapper main restricted
deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe
archive.ubuntu.com will be replace with your server address and port it would become
deb http://myProxyServerIp:port/ubuntu dapper main restricted
deb http://myProxyServerIp:port /ubuntu-security dapper-security main restricted universe

$>apt-get update

Enjoy your local proxy server.

2012-02-29T22:32:00.009-08:00

Simple Log4j Configuration

Log4j is a simple logging framework. you can download the latest version of log4j ( Download ). After download finished add jar in class path log4j-x.x.x.jar.
Create a new HelloLogger.java file.

package com.abc.helloworld;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;

public class HelloLogger {

 static final Logger logger = Logger.getLogger(HelloLogger.class);
 
 public static void main(String[] args) {
  BasicConfigurator.configure();
  logger.debug("Hello World!");
 }
}

Log4j available methods are info(), warn(), error() and fatal() , logger levels are
DEBUG, INFO, WARN, ERROR, FATAL .

Following example shows usage of method.

package com.abc.helloworld;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;

public class HelloLogger {

 static final Logger logger = Logger.getLogger(HelloLogger.class);
 
 public static void main(String[] args) {
  BasicConfigurator.configure();
  logger.debug("debug message");
  logger.info("info message");
  logger.warn("warn message");
  logger.error("error message");
  logger.fatal("fatal message");
 }
}

Output of the above code.

0 [main] DEBUG com.abc.helloworld.HelloLogger  - debug message
0 [main] INFO com.abc.helloworld.HelloLogger  - info message
0 [main] WARN com.abc.helloworld.HelloLogger  - warn message
0 [main] ERROR com.abc.helloworld.HelloLogger  - error message
0 [main] FATAL com.abc.helloworld.HelloLogger  - fatal message

Enjoy log4j in you web application.

Well Come Post

2012-01-30T23:44:00.002-08:00

Well Come Post...