This article introduces the process of setting up a server environment such as CentOS7 64 Java, Tomcat, MySQL, and Maven hot deployment.

Server: Tencent Cloud Server

The required tools (Xshell, Xftp, FileZilla and other sftp upload tools, jdk-8u101-linux-x64.tar.gz and apache-tomcat-9.0.0.M10.tar.gz) have been uploaded to Baidu Cloud [http://pan.baidu.com/s/1qYRms8G] (http://pan.baidu.com/s/1qYRms8G)

1、 tomcat official websitehttps://tomcat.apache.org/download

Java environment configuration

Environmental preparation

Use uname -r to determine how many bits the system is

64 Bit: x86_64 appears
32 Bit: i686 or i386 appears

Install Java JDK8.0

Create a Java directory to store Java and Tomcat

cd /usr/local/
mkdir java
cd java

Use FileZilla to upload the downloaded jdk-8u101-linux-x64.tar.gz and apache-tomcat-9.0.0.M10.tar.gz to the Java directory (the transmission of the foreign server is very slow, and the domestic Times, but only two to three hundred KB, it may also be a computer problem)
Unzip the uploaded jdk and rename it to jdk

tar -zxv -f jdk-8u101-linux-x64.tar.gz
mv jdk1.8.0_101 jdk
cd jdk

Configure environment variable Environment=JAVA_HOME=/usr/local/Java/jdk
vim /etc/profile
After opening, press the keyboard (i) to enter the editing mode, and copy the content below to the bottom
JAVA_HOME=/usr/local/java/jdk PATH=JAVA_HOME/bin:PATH CLASSPATH=JAVA_HOME/jre/lib/ext:JAVA_HOME/lib/tools.jar export PATH JAVA_HOME CLASSPATH
After writing, we press the keyboard (ESC) button to exit, then press (:wq) to save and close Vim.
Use the source /etc/profile command to make it effective immediately
Use java -version to verify that Java is successfully configured.

Install Tomcat9.0

Unzip the Tomcat9.0 uploaded in the previous step in the Java directory

tar -zxv -f apache-tomcat-9.0.0.M10.tar.gz
mv apache-tomcat-9.0.0.M10 tomcat
cd tomcat

The startup command is /usr/local/java/tomcat/bin/startup.sh
After the startup is complete, you need to open port 8080 (the firewall of this version of CentOS7 uses firewall by default, which is different from the previous version using iptables. For firewall ports, please refer to the following reference documents)

firewall-cmd --zone=public --add-port=8080/tcp --permanent
Success appears to indicate successful addition
Just update the firewall rules: firewall-cmd --reload
Restart firewall systemctl restart firewalld.service

Then enter http://ip:8080 in the browser again, if you see the tomcat system interface, the installation is successful.
Tomcat port 8080 cannot be accessed

Check that port 8080 is occupied by that program (it should be Java) netstat -anp and then kill the occupied process.
It may be that your server provider has a security group to control the port, you need to go to the provider to open the port (PS: My Ali云 Server** It is necessary to set the port security group Can access the port)**

The shutdown command is /usr/local/Java/tomcat/bin/shutdown.sh

Self-start:

Edit the file /usr/local/java/tomcat/bin/catalina.sh (modify according to your own jdk path) At the beginning of the body of the file, that is, before the official code, add the following code about 99 lines

export JAVA_HOME=/usr/local/java/jdk

export JRE_HOME=/usr/local/java/jdk/jre

first step:

vim /lib/systemd/system/tomcat.service

[ Unit]
Description=tomcat
After=network.target
 
[ Service]
Type=oneshot
ExecStart=/usr/local/java/tomcat/bin/startup.sh   //Own tomcat directory
ExecStop=/usr/local/java/tomcat/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
RemainAfterExit=yes
 
[ Install]
WantedBy=multi-user.target

(2). Setting permissions

chmod 754 tomcat.service

(3). Start and close the service, set the startup to start

# Start service
systemctl start tomcat.service   
# Close service
systemctl stop tomcat.service   
# boot
systemctl enable tomcat.service

MySQL

1. System environment

The system version after yum update upgrade is

[ root@yl-web yl]# cat /etc/redhat-release 
CentOS Linux release 7.1.1503(Core)

At the beginning, it was installed directly through this command:

1[ root@yl-web yl]# yum install mysql
2[ root@yl-web yl]# yum install mysql-server
3[ root@yl-web yl]# yum install mysql-devel

The installation of mysql and mysql-devel were successful, but the installation of mysql-server failed, as follows:

[ root@yl-web yl]# yum install mysql-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.sina.cn
 * extras: mirrors.sina.cn
 * updates: mirrors.sina.cn
No package mysql-server available.
Error: Nothing to do

Checking the information found that the CentOS 7 version removed the MySQL database software from the default program list and replaced it with mariadb.

There are two solutions:

1、 Method 1: Install mariadb

The MariaDB database management system is a branch of MySQL, which is mainly maintained by the open source community and is licensed under GPL. One of the reasons for the development of this branch is that after Oracle acquired MySQL, there is a potential risk of closing MySQL to the source, so the community uses branching to avoid this risk. The purpose of MariaDB is to be fully compatible with MySQL, including API and command line, so that it can easily become a substitute for MySQL.

Install mariadb, size 59 M.

[ root@yl-web yl]# yum install mariadb-server mariadb

The related commands of the mariadb database are:

systemctl start mariadb #Start MariaDB

systemctl stop mariadb #Stop MariaDB

systemctl restart mariadb #Restart MariaDB

systemctl enable mariadb #Set boot up

So start the database first

[ root@yl-web yl]# systemctl start mariadb

Then you can use mysql normally

[ root@yl-web yl]# mysql -u root -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with; or \g.
Your MariaDB connection id is 3
Server version:5.5.41-MariaDB MariaDB Server

Copyright(c)2000,2014, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h'for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || test               |+--------------------+4 rows inset(0.00 sec)

MariaDB [(none)]>

MariaDB (none)> is displayed after installing MariaDB, which may seem a bit unaccustomed. Here is the second method.

2、 Method 2: Download and install mysql-server from the official website

# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server

After the installation is successful, restart the mysql service.

# service mysqld restart

When mysql is installed for the first time, the root account has no password.

[ root@yl-web yl]# mysql -u root 
Welcome to the MySQL monitor.  Commands end with; or \g.
Your MySQL connection id is 3
Server version:5.6.26 MySQL Community Server(GPL)Copyright(c)2000,2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h'for help. Type '\c' to clear the current input statement.

mysql> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || test               |+--------------------+4 rows inset(0.01 sec)

mysql>

set password

mysql>set password for'root'@'localhost'=password('password');
Query OK,0 rows affected(0.00 sec)

mysql>

No need to restart the database to take effect.

The following content during the mysql installation:

Installed:
 mysql-community-client.x86_64 0:5.6.26-2.el7                mysql-community-devel.x86_64 0:5.6.26-2.el7                
 mysql-community-libs.x86_64 0:5.6.26-2.el7                  mysql-community-server.x86_64 0:5.6.26-2.el7               

Dependency Installed:
 mysql-community-common.x86_64 0:5.6.26-2.el7                                                                            

Replaced:
 mariadb.x86_64 1:5.5.41-2.el7_0          mariadb-devel.x86_64 1:5.5.41-2.el7_0   mariadb-libs.x86_64 1:5.5.41-2.el7_0  
 mariadb-server.x86_64 1:5.5.41-2.el7_0

So after installation, mariadb is automatically replaced and will no longer take effect.

[ root@yl-web yl]# rpm -qa |grep mariadb
[ root@yl-web yl]#

Three, configure mysql

1、 Encoding

The mysql configuration file is /etc/my.cnf

Finally add the encoding configuration

[ mysql]default-character-set=utf8

The character encoding here must be the same as in /usr/share/mysql/charsets/Index.xml.

2、 Remote connection settings

Assign all permissions of all tables in all databases to the root user at all IP addresses.

mysql> grant all privileges on *.* to root@'%'identified by 'password';

If it is a new user instead of root, you must first create a new user

mysql>create user 'username'@'%' identified by 'password';

At this point, you can connect remotely.

Maven hot deployment

Maven hot deployment can be deployed to the local server with one line of command. If there is no problem, just one line of command can be deployed to the official server. It facilitates development and deployment. Because my Tomcat9 encountered many problems.

You can refer to [maven automatic deployment to remote tomcat tutorial] (http://www.cnblogs.com/xyb930826/p/5725340.html) for deployment and testing.

The following is an error I encountered, because there is no make configuration IDEA caused an error.

[ ERROR] Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:deploy(default-cli) on project liwenhao: Cannot invoke Tomcat manager: Connect
ion reset by peer: socket write error ->[Help 1][ERROR][ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR][ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR][Help 1]

You can configure make as follows

Can succeed

**The war package is deployed on the server garbled **

You can solve the garbled code of the Chinese war package server by configuring the following properties.

< properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding></properties>

After configuring the figure.

When I used the mvn tomcat7:deploy command to hot deploy, mysql could not be connected. Later, when I redeployed, this problem did not occur.

guess

It should be a problem with my configuration file

Reference documents

Centos 7 open port 80
centos7 set Chinese
Completely uninstall MySQL database under CentOS 7
CentOS7 Remote access to MySQL

How To Install Apache Tomcat 8 on CentOS 7

CentOS install nginx+tomcat+java+mysql operating environment