Question

我想编写一个脚本来检查服务器是否已启动，如果没有，请暂停30秒并再次ping通。但我只希望它重复这个循环10分钟或20次。我需要使用它，因为我的其他脚本更新了机器和系统重新启动，所以我需要等待它再次返回。我不想设置一个巨大的睡眠时间，因为这只是效率低下。

我正在ping 0.0.0.0作为示例。

提前致谢！

#!/usr/bin/expect -f
set timeout 30
set max_try 20
set tries 0
spawn ping 0.0.0.0

expect {
    "64 bytes from 0.0.0.0" puts "servers are up"
    if [ $tries -eq $max_try ]; then
            puts "Test machine taking too long to reboot"
            exit
    fi
    timeout {incr tries;exp_continue}
 }
 puts "Going to exit now"
 exit

Answer 1

我建议你根本不需要这样做。在bash中

function ping1 {
    command ping -c 1 -W 1 "$1" >/dev/null
}

function ping2 {
    if ! ping1 "$1"; then
        sleep 120
        ping1 "$1"
    fi
}

host="0.0.0.0"
if ping2 "$host"; then
    echo "$host is up"
else
    echo "$host is down"
fi

新要求

function ping_many {
    local tries=$1 host=$2 sleep=$3
    while (( tries-- > 0 )) && ! ping1 "$host"; do
        sleep "$sleep"
    done
    return $(( ! (tries >= 0) ))  # have to invert the boolean value to a success/fail value
}

ping_many 20 0.0.0.0 30

Answer 2

我想出来，以防其他任何人感兴趣。 \ 003表示ctrl + c

#!/usr/bin/expect -f
set timeout 5
set max_try 20
for {set i 0} {$i < $max_try} {incr i 1} {
        puts "loop $i"
        spawn ping -c 2 -i 3 -W 1 0.0.0.0
        expect {
                "2 packets transmitted, 2 received" {puts "servers are up"; break}
                timeout {send \003}
        }
        sleep 30
}
puts "about to exit now";
exit

检查服务器是否已启动

2 个答案: