使用Shell脚本编写Linux守护进程_bundle exec rails server -e production

服务端程序一般需要长期后台稳定运行，除了保证程序本身的健壮外，还需要用到一些守护程序。

现分享一个简单的Shell脚本的方式：

#! /bin/sh
#进程名字可修改
PRO_NAME=rails
CMD="nohup bundle exec rails server webrick -p3000 -b 0.0.0.0 -e production >/dev/null 2>&1 -d &"
while true ; do
     #用ps获取$PRO_NAME进程数量
     NUM=`ps aux | grep -w ${PRO_NAME} | grep -v grep |wc -l`
     #echo $NUM
     #少于1，重启进程
     if [ "${NUM}" -lt "1" ];then
         echo "${PRO_NAME} was killed"
         $CMD
    #大于1，杀掉所有进程，重启
    elif [ "${NUM}" -gt "1" ];then
        echo "more than 1 ${PRO_NAME},killall ${PRO_NAME}"
        killall -9 $PRO_NAME
        $CMD
     fi
     #kill僵尸进程
     NUM_STAT=`ps aux | grep -w ${PRO_NAME} | grep T | grep -v grep | wc -l`
     if [ "${NUM_STAT}" -gt "0" ];then
         killall -9 ${PRO_NAME}
         $CMD
    fi
     sleep 5s
done
 
exit 0
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脚本保存为 xxx.sh
设置脚本执行权限 chmod 777 xxx.sh
控制台执行则：./xxx.sh 这样就会保证始终存在一个xxxx程序的运行。
需要后台持续运行则：nohup ./xxx.sh &

程序恢复的守护进程

#!/bin/bash

# 进程名 和 所在路径
PRONAME="Aliven"    
PRODIR=/home/aliven/

echo "wait for system-process, and after three seconds."
sleep 3

echo ""
echo "                ************************************************ ";
echo "                *                 start service                * ";
echo "                *----------------------------------------------* ";
echo "                *                                              * ";
echo "                *           xxxxxxxxx · xxxxxxxxxxxxxxx        * ";
echo "                *                                              * ";
echo "                *----------------------------------------------* ";
echo "                *                   Aliven                     * ";
echo "                *                 2021-12-24                   * ";
echo "                ************************************************ ";

cd $PRODIR
# echo "started Aliven process"
# start listen server
while true
do
    bRunning=$(ps -ef | grep $PRONAME | grep -v "grep")
    
    # echo "$bRunning"
    
    if [ "$bRunning" ] 
    then
        # echo "start Aliven running...."
        sleep 1   # 每隔 1秒 检测一次
    else
        # echo "starting Aliven process."
        ./Aliven &
        sleep 2
    fi
done
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