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请帮助修改此脚本，以便根据条件自动重启服务器

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请帮助修改此脚本，以便根据条件自动重启服务器

请有人帮我纠正下面的脚本，一旦内存低于 85 并且服务器负载超过 3，该脚本就会自动重启 Centos 5 服务器。我通过谷歌找到了这个脚本，我检查了一下，发现有语法错误，但我对 bash 脚本编程一无所知，所以我需要你的帮助，提前谢谢

#!/bin/sh
#usage: */2 * * * * root /root/checkload.sh

FREE_MEM_MIN="50"
# 设置最大系统负载
SYS_LOAD_MAX="3"

RESTART_FREE_MEM_MIN="500"

NAME_LIST="httpd mysqld"
for NAME in $NAME_LIST
do

    FREE_MEM=`free -m|grep Mem|awk '{print $4}'`

    #FREE_MEM=`free -m|grep Mem|awk '{print $3}'`

    SYS_LOAD=`uptime | awk '{print $(NF-2)}' | sed 's/,//'`

    MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'<'"$FREE_MEM_MIN"'?"1":"0")}'`
    LOAD_VULE=`awk 'BEGIN{print('"$SYS_LOAD"'>='"$SYS_LOAD_MAX"'?"1":"0")}'`


    #LOAD_VULE="1"
    #echo $(date +"%y-%m-%d %H:%M:%S") "DEBUG $NAME" "(FREE_MEM:$FREE_MEM|$MEM_VULE,LOAD:$SYS_LOAD|$LOAD_VULE)">> /var/log/autoreboot_debug.log



    if [ $MEM_VULE = 1 ] || [ $LOAD_VULE = 1 ] ;then

        echo $(date +"%y-%m-%d %H:%M:%S") "killall $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)">> /var/log/autoreboot.log

        service $NAME stop
        sleep 3

        skill $NAME

        sleep 10
 for i in 1 2 3
 do
  FREE_MEM=`free -m|grep Mem|awk '{print $4}'`
  MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
  if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
  then
   service $NAME start
   sleep 15
   echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
  fi
 done


        echo $(date +"%y-%m-%d %H:%M:%S") "start $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" >> /var/log/autoreboot.log
    else
 MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
 if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
 then
  service $NAME start
  sleep 15
  echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
 else
  echo "$NAME very health!(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" > /dev/null
 fi
    fi
done

答案1

看一眼监控，它似乎能够满足您的需要，甚至更多。

答案2

此脚本不会在内存使用率高或 CPU 使用率高时自动重启 Centos 5 服务器。它会重新启动您指定的服务。这是针对 GNU Bash-4.1 的更正版本：

#!/bin/bash

# Set your parameters here:

FREE_MEM_MIN="50"
SYS_LOAD_MAX="3"
RESTART_FREE_MEM_MIN="500"

NAME_LIST="httpd mysqld"

# Dont touch below this

for NAME in $NAME_LIST
do
    FREE_MEM=`free -m|grep Mem|awk '{print $4}'`
    SYS_LOAD=`uptime | awk '{print $(NF-2)}' | sed 's/,//'`
    MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'<'"$FREE_MEM_MIN"'?"1":"0")}'`
    LOAD_VULE=`awk 'BEGIN{print('"$SYS_LOAD"'>='"$SYS_LOAD_MAX"'?"1":"0")}'`
    #echo $(date +"%y-%m-%d %H:%M:%S") "DEBUG $NAME" "(FREE_MEM:$FREE_MEM|$MEM_VULE,LOAD:$SYS_LOAD|$LOAD_VULE)">> /var/log/autoreboot_debug.log
    if [ $MEM_VULE = 1 ] || [ $LOAD_VULE = 1 ] ;then
         echo $(date +"%y-%m-%d %H:%M:%S") "killall $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)">> /var/log/autoreboot.log
         service $NAME stop
         sleep 3
         skill $NAME
         sleep 10
         for i in 1 2 3
         do
             FREE_MEM=`free -m|grep Mem|awk '{print $4}'`
             MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
             if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
             then
             service $NAME start
                 sleep 15
                 echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
             fi
         done
         echo $(date +"%y-%m-%d %H:%M:%S") "start $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" >> /var/log/autoreboot.log
    else
         MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
         if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
         then
             service $NAME start
             sleep 15
             echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
         else
             echo "$NAME very health!(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" > /dev/null
         fi
    fi
done

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