Install jdk and tomcat under Linux

1. Installation of jdk

1. Upload jdk to the opt directory

2. Unzip jdk

tar -xvf jdk-8u281-linux-x64.tar.gz

3. Generally, jdk is placed in /usr/local (software installation is placed under usr)

mv jdk1.8.0_281 /usr/local/

4. Configure environment variables

Find /etc/profile for editing and modification

export JAVA_HOME=/usr/local/jdk1.8.0_281    # 设置 jdk的位置 
export PATH=$PATH:$JAVA_HOME/bin            # 设置环境变量 

Configuration file refresh:

source /etc/profile

[root@localhost ~]# java -version
java version "1.8.0_281"
Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)

2. Tomcat installation

1. Upload tomcat to the opt directory

2. Unzip

tar -xvf apache-tomcat-9.0.53.tar.gz

3. Move to /usr/local

mv apache-tomcat-9.0.53 /usr/local

Modify name:

mv apache-tomcat-9.0.53/ tomcat

4. Go to the tomcat directory to start

进入tomcaot的bin目录
cd /usr/local/tomcat/bin  目录

./startup.sh         # 执行文件启动tomcat    bat启动的win sh启动linux版本

Started successfully:

View process filter tomcat

ps -aux   查看所有的进程
|  多个命令进行串联
grep tomcat  过滤tomcat

4. Access tomcat:

http://192.168.31.129:8080/ cannot be accessed

Set up the firewall:

systemctl status firewalld View the status of firewall commands

Turn off the firewall:

Command to turn off the firewall

 systemctl stop firewalld;

To permanently disable the firewall:

 systemctl disable firewalld;

Notice:

• Turn off the firewall while studying
• You can't close it during work, just open the specified port

5. Access tomcat