如何编写 Gradle 启动脚本

Question

我有一个使用 ./gradlew run 启动的 Gradle 应用程序。这工作正常，但我正在尝试部署到 AWS 实例（Ubuntu 12），我希望脚本在启动时执行。我尝试使用上述命令编写 startup.sh 文件，但没有骰子。我也尝试将命令添加到/etc/rc.local 文件，但这似乎也不起作用。有人可以告诉我如何在启动时执行“./gradlew run”吗？谢谢！

Answer 1

我为 redhat 发行版（centos/fedora 等）编写了以下初始化脚本，用于在系统启动时启动 gradle 应用程序。

您需要执行几个步骤来将它们联系在一起：

1. 使用 gradle distZip 将您的 gradle 应用程序部署到您的目标服务器上
2. 创建配置文件/etc/my-service.conf
3. 将初始化脚本（见下文）链接到 /etc/init.d/my-service 中的服务名称

一个示例配置文件/etc/my-service.conf

username=someunixuser
serviceName=MyStandaloneServer
prog="/path/to/bin/MyStandaloneServer -a any -p params -y you -w want"
javaClass="some.java.MyStandaloneServer"

记下 prog 行中 distZip 到应用程序的路径。

然后您将初始化脚本链接到您希望它运行的实际服务，例如

ln -s /path/to/gradle-init-start-stop /etc/init.d/my-service

完成此操作后，您可以使用 chkconfig 以通常的方式添加服务（默认为 3/4/5）

这里是脚本gradle-init-start-stop

#!/bin/bash
#
# chkconfig: 345 80 20
# description: Start and stop script for gradle created java application startup
#
# This is a generic file that can be used by any distribution from gradle ("gradle distZip").
# Link this file to the name of the process you want to run.
# e.g.
#   ln -s /path/to/gradle-init-start-stop /etc/init.d/ivy-jetty
#
# it requires a conf file /etc/NAME.conf, e.g. /etc/ivy-jetty.conf
# otherwise it will quit.
#
# CONFIGURATION FILE ENTRIES:
# ---------------------------
# username=process-owner
# prog="/path/to/gradle-startscript -a any -e extra parameters"
# serviceName=SomeShortNameForService
# javaClass=package.for.JavaClass

. /etc/rc.d/init.d/functions

BASENAME=$(basename $0)
maxShutdownTime=15

CONF=/etc/${BASENAME}.conf
pidfile=/var/run/$BASENAME.pid

if [ ! -f $CONF ] ; then
  echo "Could not find configuration file: $CONF"
  exit 1
fi

####### SOURCE CONFIGURATION FILE
source $CONF

checkProcessIsRunning() {
  local pid="$1"
  if [ -z "$pid" -o "$pid" == " " ]; then return 1; fi
  if [ ! -e /proc/$pid ]; then return 1; fi
  return 0
}

checkProcessIsOurService() {
  local pid="$1"
  if [ "$(ps -p $pid --no-headers -o comm)" != "java" ]; then return 1; fi
  grep -q --binary -F "$javaClass" /proc/$pid/cmdline
  if [ $? -ne 0 ]; then return 1; fi
  return 0
}

getServicePID() {
  if [ ! -f $pidfile ]; then return 1; fi
  pid="$(<$pidfile)"
  checkProcessIsRunning $pid || return 1
  checkProcessIsOurService $pid || return 1
  return 0
}

startService() {
  cmd="nohup $prog >/dev/null 2>&1 & echo \$!"
  sudo -u $username -H $SHELL -c "$cmd" > $pidfile
  sleep 0.2
  pid="$(<$pidfile)"
  if checkProcessIsRunning $pid; then
    return 0
  else
    return 1
  fi
}

start() {
  getServicePID
  if [ $? -eq 0 ]; then echo -n "$serviceName is already running"; RETVAL=0; echo ""; return 0; fi

  echo -n "Starting $serviceName: "
  startService
  if [ $? -ne 0 ] ; then
    echo "failed"
    return 1
  else
    echo "started"
    return 0
  fi
}

stopService() {
  # soft kill first...
  kill $pid || return 1

  # check if process dead, sleep 0.2s otherwise
  for ((i=0; i<maxShutdownTime*5; i++)); do
    checkProcessIsRunning $pid
    if [ $? -ne 0 ] ; then
      rm -f $pidfile
      return 0
    fi
    sleep 0.2
  done

  # hard kill now...
  kill -s KILL $pid || return 1

  # check if process dead, sleep 0.2s otherwise
  for ((i=0; i<maxShutdownTime*5; i++)); do
    checkProcessIsRunning $pid
    if [ $? -ne 0 ] ; then
      rm -f $pidfile
      return 0
    fi
    sleep 0.2
  done
  return 1
}

stop() {
  getServicePID
  if [ $? -ne 0 ]; then echo -n "$serviceName is not running"; RETVAL=0; echo ""; return 0; fi
  pid="$(<$pidfile)"

  echo -n "Stopping $serviceName "
  stopService
  if [ $? -ne 0 ]; then RETVAL=1; echo "failed"; return 1; fi
  echo "stopped PID=$pid"
  RETVAL=0
  return 0
}

restart() {
  stop
  start
}

checkServiceStatus() {
  echo -n "Checking for $serviceName:   "
  if getServicePID; then
    echo "running PID=$pid"
    RETVAL=0
  else
    echo "stopped"
    RETVAL=3
  fi
  return 0;
}


####### START OF MAIN SCRIPT

RETVAL=0
case "$1" in
  start)
    $1
    ;;
  stop)
    $1
    ;;
  restart)
    $1
    ;;
  status)
    checkServiceStatus
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart}"
    exit 1
esac
exit $RETVAL