Build a JAVA Runtime Environment in CentOS Linux

Build a JAVA Runtime Environment in CentOS Linux

1. Install jdk

1. Enter the usr directory

Cd/usr

2. Create a java installation directory under the usr directory

Mkdir java

3. Copy jdk-6u24-linux-i586.bin to the java directory

Cp/home/itcast/Desktop/jdk-6u24-linux-i586.bin/usr/java/

4. Install jdk

Cd/usr/java

/Jdk-6u24-linux-i586.bin

5. After the installation is complete, create a link for him to save the directory Length

Ln-s/usr/java/jdk1.6.0 _ 24 // usr/jdk

6. Edit the configuration file

Vim/etc/profile

Add the following content:

JAVA_HOME =/usr/jdk

CLASSPATH = $ JAVA_HOME/lib/

PATH = $ PATH: $ JAVA_HOME/bin

Export PATH JAVA_HOME CLASSPATH

8. Restart the machine or source/etc/profile

Sudo shutdown-r now

9. view the installation status

Java-version

Java version "1.6.0 _ 24"

Java (TM) SE Runtime Environment (build1.6.0 _ 24-b07)

Java HotSpot (TM) Client VM (build 19.1-b02, mixed mode, sharing)

Ii. install tomcat

Tar-zxvf apache-tomcat-6.0.29.tar.gz-C/opt (unzip to/opt)

Ln-s/opt/apache-tomcat-6.0.29 // opt/tomcat (create a link file)

Start tomcat

Cd/opt/tomcat/bin/

./Startup. sh (Note: points represent the current directory)

If it cannot be started, try

-I switch to the root user and restart

./Startup. sh

Test http: // 127.0.0.1: 8080/

Iii. Uninstall and install mysql

1. uninstall mysql

Uninstall mysql in linux

Uninstall mysql

1. Check whether mysql is installed before.

Command: rpm-qa | grep-I mysql

We can see two mysql packages:

Mysql-4.1.12-3.RHEL4.1

Mysqlclient10-3.23.58-4.RHEL4.1

2. Delete mysql

DELETE command: rpm-e -- nodeps package name

(Rpm-ev mysql-4.1.12-3.RHEL4.1)

3. Delete the development header files and libraries of old mysql versions.

Command: rm-fr/usr/lib/mysql

Rm-fr/usr/include/mysql

Note: After uninstallation, data in/var/lib/mysql and/etc/my. cnf will not be deleted. If you are sure it is useless, manually delete it.

Rm-f/etc/my. cnf

Rm-fr/var/lib/mysql

2. Install mysql

(1) uninstall mysql rpm-e mysql // normal deletion mode [root @ xiaoluo ~] # Rpm-e -- nodeps mysql // strong deletion mode. If the above command is used to delete other dependent files, you can use this command to forcibly delete them.

(2): Install mysql using yum

1) yum list | grep mysql: Command to view the available mysql database versions on yum:

2) install yum install-ymysql-server mysql-deve

3) run the rpm-qimysql-server command to check the version of the newly installed mysql-server.

4) servicemysqld start: start our mysql service.

5) servicemysqld restart to restart mysql

6) chkconfig mysqld on sets mysql to start automatically upon startup

7) mysqladmin-u root password 'root': Use this command to set the password of the root account to root.

Error: 1130-host... isnot allowed to connect to this MySql server

It may be that your account is not allowed to log on remotely, but only on localhost. At this time, you only need to log in to mysql on the computer of localhost, and change the "host" entry in the "user" table in the "mysql" database to "%" from "localhost"

Mysql-u root-pvmwaremysql> use mysql;

Mysql> update user set host = '%' whereuser = 'root ';

Mysql> select host, user from user;

4. Open specific linux ports

More/etc/sysconfig/iptables

# Firewall configuration written bysystem-config-firewall

# Manual customization of this file is notrecommended.

* Filter

: Input accept [0: 0]

: Forward accept [0: 0]

: Output accept [0: 0]

-A input-m state -- state ESTABLISHED, RELATED-j ACCEPT

-A input-p icmp-j ACCEPT

-A input-I lo-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 22-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 80-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 8080-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 3306-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 8009-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 8081-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 3690-j ACCEPT

-A input-j REJECT -- reject-with icmp-host-prohibited

-A forward-j REJECT -- reject-with icmp-host-prohibited

COMMIT

[Root @ nb home] #/etc/init. d/iptablesrestart

Iptables: clear firewall rules: [OK]

Iptables: Set the chain to policy ACCEPT: filter [OK]

Iptables: uninstalling module: [OK]

Iptables: Application Firewall Rules: [OK]