Question

我需要帮助才能更新此脚本，如果ping失败，它会向另一台主机发送一个wakonlan调用（除了ping失败后立即发送的电子邮件）。如何从这个脚本完成？

这就是我想要达成的目标：

Server1已启动＆gt; PingComputer ping server1 =一切都很好。服务器1失败＆gt; PingComputer发送邮件并将wakeonlan调用发送到服务器2 = server2启动。

不太重要（只有在可能的情况下）：在server1上发生故障后，我想在server1再次启动时收到邮件，然后这个场景重新开始。

    #!/bin/bash
HOSTS="IP ADRESS"
COUNT=4
for myHost in $HOSTS
do
    count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | a$
    if [ $count -eq 0 ]; then
        # 100% failed
        echo "Server failed at $(date)" | mail -s "Server Down" myadress@gmail.com
        echo "Host : $myHost is down (ping failed) at $(date)"
    fi
done

我在所有3台计算机上使用ubuntu服务器btw。

Answer 1

规范

至少有一台主机必须始终可ping（ping成功= UP）当pingable主机无法访问时（ping失败）=＆gt;邮件和：
- 如果另一个主机已经pingable =＆gt;没问题=＆gt;继续
- else =＆gt; wakeonlan另一位主持人当无法访问的主机变为pingable = =邮件
当wakeonlan之后主机仍然无法访问时，它=＆gt;邮件

脚本

初始脚本基于bash。但是你的Ubuntu服务器似乎使用的bash版本太旧而没有关联数组。幸运的是，zsh支持关联数组一段时间。因此，zsh重写了以下脚本。此外，还增加了对MAC ADDRESS的支持。

脚本one_host_should_ping.sh：

#!/bin/zsh

MYADDRESS=myadress@gmail.com
NEXTHOSTWOL=${1?Please provide hosts as arguments of the script}
PINGABLECOUNT=0

# use associative array to store the state of each host
unset      HOSTS
typeset -A HOSTS
unset      MAC
typeset -A MAC
while (($#))
do
  let PINGABLECOUNT++
  HOSTS[$1]=PINGABLE
  MAC[$1]=$2
  echo >&2 -e "Input #$PINGABLECOUNT:\tIP=$1\tMAC=$2"
  shift 2
done

nexthostwol() {
  for host in ${(k)HOSTS[@]}
  do
    if [[ ${HOSTS[$host]} == UNREACHABLE ]] 
    then
      NEXTHOSTWOL=$host
      break
    fi
  done
}

report() {
  for host in ${(k)HOSTS[@]}
  do
    echo "HOST IP=$host MAC=${MAC[$NEXTHOSTWOL]} state=${HOSTS[$host]}"
  done
  echo "Number of hosts Up = $PINGABLECOUNT"
}

pingable() {
  let PINGABLECOUNT++
  HOSTS[$1]=PINGABLE
  SUBJECT="[Server Up] ping $1 success at $(date +%c)"
  echo "$SUBJECT"
  report | mail -s "$MESSAGE" "$MYADDRESS"
  report
  [[ $NEXTHOSTWOL == $1 ]] && nexthostwol
}

unreachable() {
  let PINGABLECOUNT--
  HOSTS[$1]=UNREACHABLE
  SUBJECT="[Server Down] ping $1 failed at $(date +%c)"
  if [[ $PINGABLECOUNT -le 0 ]] 
  then 
    wakeonlan -i $NEXTHOSTWOL ${MAC[$NEXTHOSTWOL]}
    HOSTS[$NEXTHOSTWOL]=WAKEONLAN
    SUBJECT="$SUBJECT => wakeonlan $NEXTHOSTWOL"
  fi
  echo "$SUBJECT"
  report | mail -s "$MESSAGE" "$MYADDRESS"
  report
}

stillwol() {
  SUBJECT="[Server Down] ping $1 failed at $(date +%c)"
  echo "$SUBJECT"
  report | mail -s "$MESSAGE" "$MYADDRESS"
  report
}

# infinite loop => check every 5 minutes 
# use CTRL+C or kill to break it
while true
do
  for host in ${(k)HOSTS[@]}
  do
      STATE=${HOSTS[$host]}
      case $STATE in
         UNREACHABLE) ping -c 1 $host && pingable $host      ;;
         PINGABLE)    ping -c 1 $host || unreachable $host   ;;
         WAKEONLAN)   ping -c 1 $host && pingable $host || stillwol $host ;;
         *)           echo >&2 "ERROR: $host is in an unexpected state=[$STATE]";;
      esac
  done

  echo "will check again in 5 minutes"
  sleep $((5*60))
done

用法

授予执行权限：

chmod +x one_host_should_ping.sh`

如果您使用两台主机：

./one_host_should_ping.sh  IP1 MAC1 IP2 MAC2

如果您使用五台主机：

./one_host_should_ping.sh  IP1 MAC1  IP2 MAC2  IP3 MAC3  IP4 MAC4  IP5 MAC5

实施例

root@myc:/usr/local# ./one_host_should_ping.sh 192.168.0.197 00:1c:26:5c:7e:d5 192.168.0.187 f4:6d:04:e5:5c:4c 
Input #1: IP=192.168.0.197 MAC=00:1c:26:5c:7e:d5 
Input #2: IP=192.168.0.187 MAC=f4:6d:04:e5:5c:4c 
PING 192.168.0.187 (192.168.0.186) 56(84) bytes of data. 
From 192.168.0.168 icmp_seq=1 Destination Host Unreachable 
--- 192.168.0.187 ping statistics 
--- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms 
[Server Down] ping 192.168.0.187 failed at tor 26 jan 2012 12.44.29 
HOST IP=192.168.0.186 MAC=00:1c:26:5c:7e:d5 state=UNREACHABLE 
HOST IP=192.168.0.197 MAC=00:1c:26:5c:7e:d5 state=PINGABLE 
Number of hosts Up = 1 
PING 192.168.0.197 (192.168.0.197) 56(84) bytes of data. 
From 192.168.0.168 icmp_seq=1 Destination Host Unreachable
--- 192.168.0.197 ping statistics 
--- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms 
Sending magic packet to 192.168.0.197:9 with 00:1c:26:5c:7e:d5 
[Server Down] ping 192.168.0.197 failed at tor 26 jan 2012 12.44.36 
=> wakeonlan 192.168.0.197 
HOST IP=192.168.0.187 MAC=00:1c:26:5c:7e:d5 state=UNREACHABLE 
HOST IP=192.168.0.197 MAC=00:1c:26:5c:7e:d5 state=WAKEONLAN 
Number of hosts Up = 0 
will check again in 5 minutes

如果server1失败，则向wakeonlan server2发送脚本

1 个答案:

规范

脚本

用法

实施例