linux expect自动telnet对server做验证

最新推荐文章于 2022-07-16 09:59:00 发布

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#server #linux #command #user #character #服务器

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本文介绍如何使用Linux Expect脚本来自动化验证大量服务器的状态，包括检查文件存在性与端口开放情况，特别适用于对服务器控制权限有限的场景。

有时候我们在产品发布之前可能面临需要对大量的服务器做环境验证，比方说在上百台server上验证文件是否存在，查看某个端口是否打开。而我们又对服务器有很少的控制权限时，linux expect 是个不错的选择。

由于对expect不是很熟，写的比较乱

#########validateServer.sh

#!/bin/sh

if [ "$1" = "" ] || [ "$2" = "" ]; then
    echo "invalid parameters"
else
    for server in `cat $1`; do
        echo "---------->" $server
        ./validateServer.expect "ssh username\@$server" "$2" password
    done
fi

#########validateServer.expect

#!/usr/local/bin/expect -f

if {$argc!=3} {
    send_user "usage: validateServer.expect host command password\n"
    send_user "\teg. validateServer.expect \"ssh user@host\" \"ls -l\" password\n"
    send_user "\tCaution: command should be quoted.\n"
    exit
}

set host [lindex $argv 0]
set command [lindex $argv 1]
set password [lindex $argv 2]
eval spawn $host

expect {
    "Are you sure you want to continue connecting (yes/no)?" {
        # First connect, no public key in ~/.ssh/known_hosts
        send "yes\r"
        expect "assword:"
        send "$password\r"
    } 
    "Enter passphrase for key " {
        # Already has public key in ~/.ssh/known_hosts
        send "$password\r"
    }
    "assword:" {
        # Already has public key in ~/.ssh/known_hosts
        send "$password\r"
    }
    "Permission denied, please try again." {
        # Password not correct
        exit
    } 
    "Connection refused" {
        exit
    }
}

set timeout 2
expect "/ $"
send "$command\n"
expect {
   "Escape character is '^]'." {
        sleep 2
        send -- "\x1d"; # This is the hex value for ^]
        expect "telnet> "
        send -- "q\r"
   }
}
expect "/ $"
send "exit\n"

set timeout 30
expect {
    timeout {
        send_user "timeout...\n"
        exit
    }
    eof {
        send_user "exit....\n"
        exit
    }
}

exit 0

server列表

#### server_list.data
thejtechs-1.com
thejtechs-2.com
thejtechs-3.com
thejtechs-4.com

测试：

./validateServer.sh server_list.data "telnet www.thejtechs.com 80"

参考： http://www.thejtechs.com/blogDetail/74/linux-auto-telnet-for-server-validation