关于Ubuntu Server 18.04 LTS 安装Tomcat并配置systemctl管理Tomcat服务的问题

tar -zxvf jdk-8u231-linux-x64.tar.gz -C ~/server

sudo apt-get install vim

sudo vi /etc/profile

#set Java environment
export JAVA_HOME=/home/ubuntu/server/jdk1.8.0_231
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

source /etc/profile

java -version
#结果
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

wget https://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-9/v9.0.27/bin/apache-tomcat-9.0.27.tar.gz

tar -zxvf apache-tomcat-9.0.27.tar.gz ~/server

vi ~/server/apache-tomcat-9.0.27/bin/setenv.sh
#setenv.sh文件内容
CATALINA_PID="$CATALINA_BASE/tomcat.pid"

sudo vi /lib/systemd/system/tomcat.service
#tomcat.service文件内容
[Unit]
Description=Tomcat
After=network.target remote-fs.target syslog.target
[Service]
Type=forking
PIDFile=/home/ubuntu/server/apache-tomcat-9.0.27/tomcat.pid
ExecStart=/home/ubuntu/server/apache-tomcat-9.0.27/bin/startup.sh
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true
[Install]
WantedBy=multi-user.target

#重载守护进程
systemctl daemon-reload
#启动服务
sudo systemctl start tomcat
#停止服务
sudo systemctl stop tomcat
#重启服务
sudo systemctl restart tomcat
#开机自启动
sudo systemctl enable tomcat
#取消自启动
sudo systemctl disable tomcat

export JAVA_HOME=/home/ubuntu/server/jdk1.8.0_231
export JRE_HOME=$JAVA_HOME/jre