1，端口訪問，安全組配置，打開端口權限；
2，JDK安裝：
安裝安裝包：yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel
檢查安裝：java -version
安裝路徑：ls /usr/lib/jvm
修改配置/etc/profile：
# set java environment
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
PATH=$PATH:$JAVA_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME CLASSPATH PATH
配置生效：source /etc/profile
查看JDK變量：echo $JAVA_HOME echo $PATH echo $CLASSPATH
3，安裝apache tomcat：
安裝目錄：cd /usr/local
下載版本：wget http://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.41/bin/apache-tomcat-8.5.41.tar.gz
解壓版本：tar -zxvf apache-tomcat-8.5.41.tar.gz
修改tomcat的catalina.sh文件： vim apache-tomcat-8.5.39/bin/catalina.sh
CATALINA_PID="$CATALINA_BASE/tomcat.pid" {classpath=。。。}
修改tomcat配置：vim /usr/lib/systemd/system/tomcat.service
[Unit]
Description=tomcat
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
Environment="JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64"
PIDFile=/usr/local/apache-tomcat-8.5.41/tomcat.pid
ExecStart=/usr/local/apache-tomcat-8.5.41/bin/startup.sh
ExecStop=/usr/local/apache-tomcat-8.5.41/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
PrivateTmp=true
[Install]
WantedBy=multi-user.target
tomcat的監聽端口8080爲80端口：vim /usr/local/apache-tomcat-8.5.41/conf/server.xml
<Connector port="80" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
4，開始/停止/重啓 tomcat : systemctl start/stop/ restart tomcat
開機啓動 : systemctl enable tomcat