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javaapplicationWeb application setup on Ubuntu VPS

2天前CN2资讯

题记：写这篇博客要主是加深自己对javaapplication的认识和总结实现算法时的一些验经和训教，如果有错误请指出，万分感谢。

Now there are many hosting server for people to choose to host their own apps or website. And sometimes normal web hosting can not exactly fulfil your requirements. So VPS is a good option, with VPS you can setup anything you want just like you are working in your own server.

Next I will share my experience of my java based apps/website setup, it will contains below several sections:

1. Find a good VPS;

2. Setup JDK;

3. Setup Tomcat;

4. Setup Database;

5. Setup your application;

6. Setup cron jobs;

1. Find a good VPS

Obviously, you need to choose one VPS with a reasonable price and can provide good service e.g. bandwidth this is very important for your apps/website. What you can do is find the information from internet see the feedback of those existing user. The time i chooses Atlantic.Net, as they offer $10 for the new new user, with this $10 you can almost run your apps as a trial for 2 months, and during the 2 months definitely you can see how is the service provider.

2. My website is java based, so first thing first, setup JDK

Ubuntu install and configure JDK

Ubuntu 12.04

steps:

a. download and install jdk

$sudo apt-get install openjdk-6-jdk

b. check the system JVM

$sudo update-alternatives --display java

c. install JVM

$sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-1.6.0-openjdk-i386/bin/java 60

d. update system JVM

$sudo update-alternatives –config java

e. configure environment variables

$vim /etc/profile

add below lines in the end:

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-i386

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$JAVA_HOME/bin:$PATH

export JAVA_HOME

export PATH

export CLASSPATH

save and reboot ubuntu

f. validate the installation

$echo $JAVA_HOME

$java -version

Note: Vi command

You need to use this for editing the configuration file

Comand mode：control the cursor move

Insert mode：only in this Insert mode you can do the editing, press Esc can go back to Comand mode

Last line mode：will save the file and leave the editing

i - insert

a - add, input from the next words

o - insert a new line and start to input

:w filename (save the file with this filename)

:wq (save and exit)

:q! (discard changes and exit)

3. Setup Tomcat

a. download apache-tomcat6,

http://archive.apache.org/dist/tomcat/tomcat-6/v6.0.28/bin/

选择Ubuntu Linux实用版本，即apache-tomcat-6.0.28.tar.gz文件，

b. 复制安装文件到/usr/local/目录下面，在控制台console输入命令，

sudo tar -zxvf apache-tomcat-6.0.28.tar.gz,

将安装包解压至apache-tomcat-6.0.28目录下，

配置tomcat的启动环境，在/etc/environment目录下添加

CATALINA_HOME="/usr/local/apache-tomcat-6.0.28"

c. console输入命令：sudo gedit /usr/local/apache-tomcat-6.0.28/bin/startup.sh，

配置startup.sh文件，添加入以下配置项，

JAVA_HOME=/usr/lib/sunJVM/JDK/jdk1.6.0_20

JRE_HOME=/usr/lib/java/jdk1.6.0_20/jre

PATH=$JAVA_HOME/bin:$JRE_HOME:$PATH

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

TOMCAT_HOME=/usr/local/apache-tomcat-6.0.28

其中的JAVA_HOME等如同上文Sun JDK安装一文所示。

保存退出。

d. 进入/usr/local/apache-tomcat-6.0.28/bin/目录，

输入命令：

cd /usr/local/apache-tomcat-6.0.28/bin，

sudo ./startup.sh

启动tomcat服务器，

若涌现：

Using CATALINA_BASE: /usr/local/apache-tomcat-6.0.28

Using CATALINA_HOME: /usr/local/apache-tomcat-6.0.28

Using CATALINA_TMPDIR: /usr/local/apache-tomcat-6.0.28/temp

Using JRE_HOME: /usr/lib/sunJVM/JDK/jdk1.6.0_20

Using CLASSPATH: /usr/local/apache-tomcat-6.0.28/bin/bootstrap.jar

代码，则基本上畸形启动了，输入http://localhost:8080/查看，看看是否涌现熟悉的tomcat欢送界面。

可以用系统自带的文字浏览器w3m,

w3m的一般应用方法就是：$w3m http://localhost:8080/

C-c 停止

C-z 挂起（退出）

q 退出（需确认）

Q 退出而不确认

每日一道理

自己把自己说服了，是一种理智的胜利；自己被自己感动了，是一种心灵的升华；自己把自己征服了，是一种人生的成功。

4. Setup database - Mysql

#apt-get install mysql-server

issue you may encounter - mysql“Access denied for user 'root'@'localhost'”

直接应用/etc/mysql/debian.cnf文件中[client]节提供的用户名和密码:

# mysql -udebian-sys-maint -p

Enter password: <输入[client]节的密码>

mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';

mysql> FLUSH PRIVILEGES;

mysql> quit

# mysql -uroot -p

Enter password: <输入新设的密码newpassword>

mysql> source \usr\local\test.sql;

5. setup application

put your war file to tomcat webapps directory and run tomcat

Note: jar -cvf test.war *

Issue you may encounter - com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'xyz' doesn't exist

this normally because the name is case sensitive on linux

6. Setup cron job

This will be used when there is a requirement that you need to run some cron job, e.g. update something daily to your database or sent out your application daily report

Installing Crontab From a Cron File

Instead of directly editing the crontab file, you can also add all the entries to a cron-file first. Once you have all thoese entries in the file, you can upload or install them to the cron as shown below.

ramesh@dev-db$ crontab -l

no crontab for ramesh

$ cat cron-file.txt

@yearly /home/ramesh/annual-maintenance

*/10 * * * * /home/ramesh/check-disk-space

ramesh@dev-db$ crontab cron-file.txt

ramesh@dev-db$ crontab -l

@yearly /home/ramesh/annual-maintenance

*/10 * * * * /home/ramesh/check-disk-space

Note: This will install the cron-file.txt to your crontab, which will also remove your old cron entries. So, please be careful while uploading cron entries from a cron-file.txt.

/usr/lib/jvm/java-6-openjdk/bin/javac tes.java

0 */2 * * * script.sh

#! /bin/sh

java -jar <your jar file>

@daily java -jar /usr/local/custom/cron/application.jar > /usr/local/log.log 2>&1

@daily java -jar /usr/local/custom/cron/application.jar | mail -s "cron output" youemail@

Note: You can use the IDE tools (e.g. IntelliJ IDEA, eclipse) to package the jar file.

and this executable .jar file must contains a MANIFEST.MF file to indicate the related classpath

文章结束给大家分享下程序员的一些笑话语录：程序员打油诗　　

　　写字楼里写字间，写字间里程序员;

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