expect 批量自动部署ssh 免密登陆

[root@node2 ssh]# cat auto_ssh.sh 
#!/usr/bin/expect -f
##########################################
#通过SSH服务将id.pas.pub公钥推送到目标服务器实现免密登陆
#参数:1.system_username
#     2.system_password
#     3.system_hostname
#     4.CommandList [多个命令间；间隔]
#返回值：
#     0  成功
#     1  参数个数不正确
#     2  SSH 服务器服务没有打开
#     3  SSH 用户名密码不正确
#     4  连接SSH服务器超时
##########################################
proc usage {} {
    regsub ".*/" $::argv0 "" name
    send_user "Usage:
"
    send_user "$name system_username system_password system_hostname CommandList
"
    exit 1
}
if {[llength $argv] !=3} {
    usage
}

#设置变量值
set timeout 10 
set system_username [lindex $argv 0] 
set system_password [lindex $argv 1] 
set system_hostname [lindex $argv 2] 
#检查主机是否可达
spawn ping ${system_hostname} -w 2
expect {
 -nocase -re "100% packet loss" {
  send_error "Ping ${system_hostname} is unreachable, Please check the IP address.
"
  exit 1
 }
}
#超时时间
set timeout 60
set resssh 0
spawn ssh-keygen -t rsa
expect {
        "*file in which to save the key*" {
            send "

"
            send_user "/root/.ssh
"
            exp_continue
        "*Overwrite (y/n)*"{
            send "n

"
        }
        }
        "*Enter passphrase*" {
            send "

"
            exp_continue
        }
        "*Enter same passphrase again*" {
            send "

"
            exp_continue
        }
}
spawn ssh-copy-id -i /root/.ssh/id_rsa.pub $system_username@$system_hostname
expect {
            #first connect, no public key in ~/.ssh/known_hosts
            "Are you sure you want to continue connecting (yes/no)?" {
            send "yes
"
            expect "password:"
                send "$system_password
"
            }
            #already has public key in ~/.ssh/known_hosts
            "password:" {
                send "$system_password
"
            }
            "Now try logging into the machine" {
                #it has authorized, do nothing!
            }
        }
expect eof