Linux使用systemctl实现开机自启动

1、在部署目录下新建 startup.sh 脚本（注意java路径要改为绝对路径）。然后检查该脚本是否可以执行。

  #!/bin/sh
  WORKDIR=/home/
  TARGET=test.jar
  
  start(){
    pid=`get_pid`
	now=`date "+%Y-%m-%d %H:%M:%S"`
	if [ -z "$pid" ]; then
	  new_target
	  pid=`get_pid`
	  printf '%s start %s done, with pid %s.\n' "$now" "$TARGET" "$pid"
	else
      printf '%s %s is running, with pid %s.\n' "$now" "$TARGET" "$pid"
	fi
  }
  
  new_target(){
    if [ -f "$WORKDIR"/"$TARGET" ]; then
      exec /usr/local/jdk1.8.0_381/bin/java -Xms2048m -Xmx4096m -jar "$WORKDIR"/"$TARGET"  >/dev/null 2>&1 &
    else
      now=`date "+%Y-%m-%d %H:%M:%S"`
      printf '%s %s file not exist.\n' "$now" "$WORKDIR"/"$TARGET"
    fi
  }
  
  stop(){
    pid=`get_pid`
    now=`date "+%Y-%m-%d %H:%M:%S"`
	if [ -z "$pid" ]; then
      printf '%s %s is NOT running, ignored.\n' "$now" "$TARGET"
	else
	  printf '%s try to kill %s, with pid %s.\n' "$now" "$TARGET" "$pid"
        kill "$pid"
        wait_till_killed
	fi
  }
  
  wait_till_killed(){
    wait_time=60
    while [ $wait_time -ge 0 ]
	do
	sleep 1
	pid=`get_pid`
	now=`date "+%Y-%m-%d %H:%M:%S"`
	if [ -z "$pid" ]; then
	  printf '%s stop %s done.\n' "$now" "$TARGET"
	  return
	else
	  printf '%s wait till killed, with pid %s.\n' "$now" "$pid"
	fi
	let wait_time--
	done
	
	kill -9 "$pid"
	printf '%s FORCE stop %s done.\n' "$now" "$TARGET"
  }
  
  status(){
    pid=`get_pid`
	now=`date "+%Y-%m-%d %H:%M:%S"`
	if [ -z "$pid" ]; then
	  printf '%s %s is NOT running.\n' "$now" "$TARGET"
	else
      printf '%s %s is running, with pid %s.\n' "$now" "$TARGET" "$pid"
	fi
  }
  
  get_pid() {
    pid=`ps -aux | grep "$TARGET" | grep -v grep | awk '{print $2}'`
    echo "$pid"
  }
  
  check(){
    pid=`get_pid`
	now=`date "+%Y-%m-%d %H:%M:%S"`
	if [ -z "$pid" ]; then
	  printf '%s %s is NOT running, call by watch dog.\n' "$now" "$TARGET"
	  start
	fi
  }
  
  monitor(){
    now=`date "+%Y-%m-%d %H:%M:%S"`
    printf '%s %s start to monitor.\n' "$now" "$TARGET"
    while [ 1 ]
	do
	  sleep 10
	  check
	done
	now=`date "+%Y-%m-%d %H:%M:%S"`
	printf '%s %s stop to monitor.\n' "$now" "$TARGET"
  }
  
  echo "---------------------------------------------------"
  echo "  Start/Stop/Status script"
  echo "  Work dir: $WORKDIR "
  echo "  APP: $TARGET     "
  echo "---------------------------------------------------"
  
  
  case "$1" in
  start)
  start
  ;;
  stop)
  stop
  ;;
  status)
  status
  ;;
  monitor)
  monitor
  ;;
  check)
  check
  ;;
  restart)
  stop
  start
  ;;
  *)
  printf 'Usage: %s {start|stop|status|restart|monitor|check}\n' "$0"
  exit 1
  ;;
  esac
 

2、在 /etc/systemctl/system 目录下，新建test.service 文件。内容如下

[Unit]
After=network-online.target
Wants=network-online.target
 
[Service]
WorkingDirectory=/home/
 
Type=forking
ExecStart=/bin/bash ./startup.sh start
ExecStop=/bin/bash ./startup.sh stop
 
TimeoutSec=65
 
RestartSec=10
 
Restart=always
 
StartLimitInterval=0
 
LimitNOFILE=65535
 
LimitNPROC=65535
 
LimitCORE=65535
 
KillMode=process
 
SuccessExitStatus=143
 
 
[Install]
WantedBy=multi-user.target
 

3、修改了service文件，需要执行以下命令更新一下。

systemctl daemon-reload

4、设置开机自启动

systemctl enable test.service

5、执行以下命令，启动/关闭/查看状态。

systemctl start test.service
 
systemctl stop test.service
 
systemctl status test.service