Graphic tutorial for installing JDK, Tomcat and MySQL on Linux

This article will introduce in detail how to install JDK, Tomcat and MySQL in Linux after installing a virtual machine on Windows. If you are interested, you can learn more

This article will introduce in detail how to install a virtual machine on Windows. How to install JDK, Tomcat and MySQL in Linux, I hope it can help you.

First of all, these installations are run in xshell, what, no xshell? Well, I'll give you the resources. After installation, there will be xshell inside, just open it and use it.

1. Install JDK

I personally recommend using the rpm package when installing. The rpm in Linux is equivalent to the exe in Windows. There is no need to manually set up using the installation method in this article. environment variables.

Here is a resource for JDK-8.

1.1 Upload the local JDK file to the server (Linux)

Many people will use xftp to drag directly to Linux. Although the same effect can be achieved, But this is what a rookie does. Today we will use another method, which is quite crude: typing commands.

Knocking the command will use a software. In the future, yum will be used first to install software. yum puts some popular Linux packages on some relatively fast domestic servers. It downloads the installation package in rpm format and installs it.

Okay, let’s install this software first, command: yum -y install lrzsz;

##Use file upload command: rz -y ;

#A dialog box will pop up, just select the JDK installation package.

1.2 Get the rpm package

Use the command:

yum -y install jdk-8u141-linux-x64.rpm;

After a while, the installation will be successful. This method does not require configuring environment variables. After installation, you should develop a habit and test whether the environment variables work well:

2. Install Tomcat

2.1 Put the Tomcat installation package into Linux

You can use the command line. To save trouble, there is no need for commands here. Just use xftp to drag it into Linux (forgive me). Here is a resource for Tomcat.

(How about various resources, I’m pretty good, haha)

It is recommended to put all the software you need to decompress under the /data directory. If there is no such directory, you can directly Create this directory under the root directory. The command to create this directory: mkdir /data

Enter the /data directory and copy (cut) the Tomcat compressed package to the /data directory:

2.2 Decompress the Tomcat compressed package

Use the command: tar -xzvf apache-tomcat-8.0.45.tar. gz

Among them:

X: represents release (decompression);

V: represents the display of the decompression process;
Z: represents whether this is a compressed package, Generally speaking, if it ends with gz, it means a compressed package;
F: means recursive decompression;

Of course, you can also choose to modify the name of Tomcat, command: mv (there is a space here) apache- tomcat-8.0.45 (there are also spaces here) tomcat_test_1

Start Tomcat: Whether you write a relative path or an absolute path, you must specify to run startup.sh

2.3 Check whether Tomcat is started

Some people may have questions, why don’t you check whether Tomcat is started? Sometimes the Tomcat port is occupied, so Will fail to start.

Check whether the command is started: ps aux|grep tomcat

Then look at the Tomcat path and its port number, as shown in the red box above Show.

After your Tomcat is opened, you will be ecstatic to enter your virtual machine IP address plus 8080 in the browser to access the three-legged cat (Tomcat icon). You will find that the cat will not show up until dawn. It will appear, not that the cat is lost, but that it was blocked on its way to your computer by the great firewall.

So there is one step left, stop the firewall.

2.4 Stop the firewall

Command:

service iptables stop

Then enter the IP address of the virtual machine plus 8080 in the browser to see the Tomcat logo:

3. Install the latest version mysql 5.7

On the official website of MySQL, there is a link: A Quick Guide to Using the MySQL Yum Repository.

Now, I will walk you through the installation process according to this address.

3.1 Create yum source

Create yum source. The file name can be chosen casually, but the official website recommends naming it mysql-community.repo, so create a new file with the extension repo and the file content. As follows:

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

Upload this file to /etc/yum.repos.d/.

Then use the command: yum search mysql, you will find an extra line at the bottom:

3.2 Install mysql

Use command: yum install mysql-community-server

##3.3 Restart mysql

Use command:

service mysqld restart

3.4 View login password

This password is a temporary password and can only be used once. Use the changed password to log in to the mysql client.

3.5 Log in to the mysql client

Use the command:

mysql -u root -p

After successfully logging in, the first thing to do is to change the password, haha.

The official website provides a command to change the password:

ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

However, this password is also difficult to remember. If you want to change it to a simple password, for example It is said to change MyNewPass4! to 123456. Such a password is easy to remember, but when you run it, you will find that it will not let you change it because it is too simple and does not comply with its naming rules.

So, first successfully log in to MySQL according to the command provided by the official website above, and then uninstall the mysql password plug-in:

uninstall plugin validate_password;

Then change the password:

ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

Type exit to exit the client, and then log in with the new password.

The default account is used locally and is not allowed to be used on different computers. For example, you cannot use Navicat to connect to the MySQL database in Windows.

How can this be done? Re-create an account to allow remote connections. The command is as follows:

Copy code The code is as follows:

grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;

Then use Navicat under Windows to connect to the database.

3.6 Modify the default encoding

After using Navicat to connect to the database, the default encoding format is Latin, so you need to modify the default encoding format.

Modify the configuration file /etc/my.cnf. When changing the file again, develop a habit of making a backup copy before modifying it.

Use vi /etc/my.cnf, then find mysqld, add a line

character_set_server=utf8

Then Just restart the mysql service, use the command: service mysqld restart

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