Install Jdk,tomcat and MySQL under Linux

Environment: centOS6.8, jdk1.8,tomcat-8.5.15,mysql-5.7.18 1. Installing the JDK

Note:rpm and software-related commands are equivalent to software Assistant management software under windows

Steps:

　　1) View current Linux whether the system has been installed Java

grep Java

Enter the above instructions to check whether the installation is not unnecessary, and then uninstall it with the following command

RPM-E--nodeps software to uninstall

2) upload jdk-8u131-linux-x64.tar.gz to Linux

3) Unzip the JDK to the directory you want to unzip

tar -zxvf jdk-8u131-linux-x64. tar. Gz-c/usr/local/

4) Configure the JDK environment variable, open the/etc/profile configuration file with the following command,

Vim/etc/profile

Copy the configuration below (thejava_home path is configured according to its actual decompression path )

#set java environmentjava_home=/usr/local/jdk1. 8 . 0_131classpath=.: $JAVA _home/Lib.tools.jarPATH= $JAVA _home/bin: $PATHexport java_home CLASSPATH PATH

5) Reload the/etc/profile configuration file

Source/etc/profile

5. Test whether Java commands are available

Authentication method is the same as Windows

2. Tomcat installation

The tomcat configuration is simple, just unzip the folder you want to unzip.

Steps:

1) upload Tomcat to Linux

2) Unzip the Tomcat to the desired decompression

TAR-ZXVF apache-tomcat-8.5. tar.gz-c/usr/local/

3) Open Linux port 8080 for external access

8080 -j ACCEPT

Permanently save open ports

/etc/rc.d/init.d/iptables Save

4) Start off Tomcat

Enter Tomcat under the bin to start:

./startup.sh

Enter Tomcat under the bin to close:

./shutdown.sh

This installs well and you can access tomcat through the browser to test for successful startup

3.mysql Installation

1) See if the current CentOS system has MySQL

Rpm-qa | grep MySQL

Enter the above instructions to check whether the installation is not unnecessary, and then uninstall it with the following command

RPM-E--nodeps software to uninstall

2) upload Mysql-5.7.18-1.el6.x86_64.rpm-bundle.tar to Linux

3) Extract MySQL to the directory you want to unzip

TAR-XVF mysql-5.7. 1. el6.x86_64.rpm-bundle.tar-c/usr/local/mysql-5.7. /

These files are available after decompression:

4) Install MySQL dependency (lack of dependencies to install, not missing can skip this step)

Yum Install-y libaio*

Yum Install-y libnuma*

5) Install MySQL (be sure to install in this order, or there will be a lack of dependency problem)

RPM-IVH mysql-community-common-5.7. 1. el6.x86_64.rpm

RPM-IVH mysql-community-libs-5.7. 1. el6.x86_64.rpm

RPM-IVH mysql-community-client-5.7. 1. el6.x86_64.rpm

RPM-IVH mysql-community-server-5.7. 1. el6.x86_64.rpm

6) Start MySQL

Service mysqld Start

7) Add MySQL to the system service and set the boot up

Add to System services:

Chkconfig--add mysqld

Auto Start:

Chkconfig mysqld on

8) Next log in to MySQL

Get the default password for MySQL's initial build first

' Temporary password ' /var/log/mysqld.log

The following results appear, with the initial password in the red box

Then log in to MySQL

Mysql-uroot-p2gd6oq:kxkuf

Change password immediately after login or the following error will occur

Enter the following instructions to change the password

' Root '@'localhost'123456';

If you change your password, the following error indicates that the password is too simple

If the password is not simple, there are the following errors, can be modified as follows

Set Global validate_password_policy=0;

Set Global validate_password_length=1;

And then change the password again, okay?

Telnet on MySQL

MySQL is not supported by default MySQL for security purposes, if you want to telnet, you need to set the remote login MySQL permission

' Root ' @'%'root';

Explanation: Grant all on * * to username @ "%" identified by "password"; This user name and password is a telnet user name and password

Refresh Permissions Table

Flush privileges;

Open Linux port 3306 for external access

3306 -j ACCEPT

Permanently saving modifications to the firewall

/etc/rc.d/init.d/iptables Save

Install Jdk,tomcat and MySQL under Linux