nginx

vim /usr/lib/systemd/system/nginx.service

[Unit]
Description=Seuic Nginx Server
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx

[Install]
WantedBy=multi-user.target

设置开机自启动
systemctl enable nginx.service

mysqld

vim /usr/lib/systemd/system/mysqld.service

[Unit]
Description=Seuic MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=syslog.target network.target

[Service]
User=mysql
Group=mysql
ExecStart=/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf
LimitNOFILE = 5000

[Install]
WantedBy=multi-user.target

设置开机自启动
systemctl enable mysqld.service

tomcat

vim /usr/local/apache-tomcat-9.0.20/bin/catalina.sh

# Get standard environment variables
PRGDIR=`dirname "$PRG"`

# Only set CATALINA_HOME if not already set
[ -z "$CATALINA_HOME" ] && CATALINA_HOME=`cd "$PRGDIR/.." >/dev/null; pwd`

# Copy CATALINA_BASE from CATALINA_HOME if not already set
[ -z "$CATALINA_BASE" ] && CATALINA_BASE="$CATALINA_HOME"

#添加的pid
# setting tomcat.pid
CATALINA_PID="$CATALINA_BASE/tomcat.pid"

vim /usr/lib/systemd/system/tomcat.service

[Unit]
Description=Seuic Tomcat
After=syslog.target network.target remote-fs.target nss-lookup.target

[Service]
Type=forking

Environment="JAVA_HOME=/usr/local/jdk1.8.0_161"
Environment="CATALINA_HOME=/usr/local/apache-tomcat-9.0.20"

PIDFile=/usr/local/apache-tomcat-9.0.20/tomcat.pid
ExecStart=/usr/local/apache-tomcat-9.0.20/bin/startup.sh
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true

[Install]
WantedBy=multi-user.target

修改.service文件后需要执行下面命令使其生效：
systemctl daemon-reload

启动tomcat服务
systemctl start tomcat.service

设置开机自启动
systemctl enable tomcat.service

停止开机自启动
systemctl disable tomcat.service

查看服务当前状态
systemctl status tomcat.service

重新启动服务
systemctl restart tomcat.service

查看所有已启动的服务
systemctl list-units --type=service