Shell expect real cases

1、The command needs to be executed to the machines in the cluster,Or modify a configuration

环境准备：三台虚拟机 ip 为 192.168.0.102 192.168.0.107 192.168.0.108

方法1采用ssh [email protected] “cmd”的方式

1) 开发expectautomatic interactive commands,文件名为exec_cmd1.exp

#!/usr/bin/expect

set ip [lindex $argv 0]The positional parameter is passed inip

set cmd [lindex $argv 1]的第2A command to execute with positional arguments

set password "zhangbichen"设置root的paasword

spawn ssh [email protected]$ip "$cmd"

expect {

      "yes/no" {send "yes\r";exp_continue}

      "password" {send "$password\r"}

}

expect eof

2) 使用shell循环在执行expect命令,batch_exec_cmd1.shInteractive execution on each of multiple hosts.

#!/usr/bin/bash

cmd=$1

if [ $# -ne 1 ]

   then

     echo $"usage:$0 cmd"

     exit 1

fi

ip_list=(192.168.0.107 192.168.0.102 192.168.0.108)

for ip in ${ip_list[@]}

do

  echo $ip

  expect exec_cmd1.exp $ip "$cmd"执行expect脚本传入expectTwo positional parameters to set

done

方法2Send the command to execute when you log in to the command line interactively

[[email protected] scripts]# cat exec_cmd.exp

#!/usr/bin/expect

set host [lindex $argv 0]

set user [lindex $argv 1]

set password [lindex $argv 2]

set root_password [lindex $argv 3]

spawn ssh [email protected]$host

set timeout 1

expect {

      "yes/no" {send "yes\r";exp_continue}

      "password" {send "$password\r"}

}

expect "$"

send "su - root\r"

expect "Password"

send "${root_password}\r"

expect "#" {send "cp /etc/profile /etc/profile.bak\r"}

expect eof

批量执行expect脚本

#!/urs/bin/bash

ip_list=(192.168.0.107 192.168.0.102)

for ip in ${ip_list[@]}

do

  echo $ip

  expect exec_cmd.exp $ip test01 yankefei yankefei

done

注意：The general production environment is to log in with a common user first,在切换root用户登录, Username and password can be defined directly to expect脚本中

2、Send files in batches

1）开发expect自动交互脚本

[[email protected] scripts]# cat send_file.exp

#!/usr/bin/expect

set file [lindex $argv 0]

set host [lindex $argv 1]

set remote_dir [lindex $argv 2]

set password "zhangbichen"

spawn scp -P22 -rp $file [email protected]$host:${remote_dir}

set timeout 1

expect {

      "yes/no" {send "yes\r";exp_continue}

      "password" {send "$password\r"}

}

expect eof

2）Development loop batch send script

[[email protected] scripts]# cat batch_send.sh

#!/urs/bin/bash

file=$1

remote_dir=$2

ip_list=(192.168.0.107 192.168.0.102)

for ip in ${ip_list[@]}

do

  echo $ip

  expect send_file.exp $file  $ip  ${remote_dir}

done

3、Batch execute on all serversshell脚本

1）按照章节2The batch file example will send the script to the specified directory on all servers

2）按照章节1to execute the command on all machines sh  batch_exec_cmd1.sh “source /opt/108.sh”