CentOS uses expect to remotely execute scripts and commands in batches

Sometimes we may need to operate servers in batches, such as uploading a file on the server, installing software, executing a command and script, restarting services, restarting servers, etc. If we operate them one by one manually, it will be very cumbersome and waste manpower.

At this time, we can use expect to send instructions to the target server to implement batch operations.

The following example will batch copy a file on centos to other service providers and execute the corresponding command

1. Install expect on centos

yum install expect

2. Write the expect script copyfilebatch.sh

The following script will copy an rc.local file to the servers with intranet IP addresses 192.168.0.102 to 192.168.0.112. After the copy is successful, execute the chmod command to restart the servers respectively.

#!/usr/bin/expect -f
set password rootpassword

for {set i 102} {$i <= 112} {incr i} {
  set ip "192.168.0.$i"
  puts "$ip"


  spawn ssh -o StrictHostKeyChecking=no $ip
  set timeout 3
  expect "root@$ip's password:"
  set timeout 3
  send "$password\r"
  set timeout 3
  send "exit\r"


  spawn scp /home/install/rc.local root@$ip:/etc/rc.d/rc.local
  set timeout 3
  expect "root@$ip's password:"
  set timeout 3
  send "$password\r"
  set timeout 3
  send "exit\r"




  spawn ssh root@$ip

  expect {
  "*yes/no" { send "yes\r"; exp_continue}
  "*password:" { send "$password\r" }
  }
  expect "#*"

  #Command to be executed send "chmod +x /etc/rc.d/rc.local\r"
  send "reboot\r"
  send "exit\r"
  expect eof
}

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