expect环境安装以及简单脚本测试

expect是交互性很强的脚本语言,可以帮助运维人员实现批量管理成千上百台服务器操作,是一款很实用的批量部署工具
expect依赖于tcl,而linux系统里一般不自带安装tcl,所以需要手动安装

下载:expect-5.43.0.tar和tcl8.4.11-src.tar

可以到安科网资源站下载:

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具体下载目录在 /2017年资料/2月/20日/expect环境安装以及简单脚本测试/

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将expect和tcl的软件包下载放到/usr/local/src目录下

(1)解压tcl,进入tcl解压目录,然后进入unix目录进行编译安装
[root@linuxidc src]# tar -zvxf tcl8.4.11-src.tar.gz
[root@linuxidc src]# cd tcl8.4.11/unix
[root@linuxidc unix]# ./configure
[root@linuxidc unix]# make && make

(2)安装expect
[root@linuxidc src]# tar -zvxf expect-5.43.0.tar.gz
[root@linuxidc src]# cd expect-5.43.0
[root@linuxidc expect-5.43.0]# ./configure --with-tclinclude=/usr/local/src/tcl8.4.11/generic --with-tclconfig=/usr/local/lib/
[root@linuxidc expect-5.43.0]# make && make install

(3)安装完成后进行测试
[root@linuxidc ~]# expect
expect1.1>
expect1.1>

----------------------------------------------------------------------------------------------------

下面结合shell脚本做简单测试:

例1:
从本机自动登录到远程机器192.168.1.200(端口是22,密码是:PASSWORD)
登录到远程机器后做以下几个操作:
1)useradd wangshibo
2)mkdir /opt/test
3) exit自动退出

[root@linuxidc tmp]# cat test-ssh.sh
#!/bin/bash
passwd='PASSWORD'
/usr/local/bin/expect <<-EOF
set time 30
spawn ssh -p22 [email protected]
expect {
"*yes/no" { send "yes\r"; exp_continue }
"*password:" { send "$passwd\r" }
}
expect "*#"
send "useradd wangshibo\r"
expect "*#"
send "mkdir /opt/test\r"
expect "*#"
send "exit\r"
interact
expect eof
EOF

[root@linuxidc tmp]# sh test.sh
spawn ssh -p22 [email protected]
[email protected]'s password:
Last login: Fri Sep 23 16:21:20 2016 from 192.168.1.23
[root@vm-002 ~]# useradd wangshibo
[root@vm-002 ~]# mkdir /opt/test
[root@vm-002 ~]# [root@linuxidc tmp]#

*******************************************************************************************************

例2:

我们在部署无密码访问时,手工建立ssh互信需要好几个步骤,并且中途人工交互(输入密码等),如果机器数目多,则很繁琐!

下面方法用于自动化生成authorized_keys,免去了手工数据.

方法: 利用expect编写sshkey.exp在远程主机上生成id_rsa,并重定向到本地.在利用noscp.exp.把文件复制到远程主机
为了节省自己的时间,可以写个expect自动化脚本,分享如下:

(1)
如上expect安装后的路径是:
[root@linuxidc ~]# which expect
/usr/local/bin/expect

(2)
做个expect执行文件的软件
[root@linuxidc ~]# ln -s /usr/local/bin/expect /usr/bin/expect
[root@linuxidc ~]# ll /usr/bin/expect

(3)
编写expect脚本:
-----------------------------------------------------------------------------------
1)
[root@linuxidc ~]# cat sshkey.exp
#!/usr/bin/expect

#sshkey.exp

if {$argc<3} {
puts stderr "Usage: $argv0 host user passwd "
exit 1
}

set host [ lindex $argv 0 ]
set user [ lindex $argv 1 ]
set pwd [ lindex $argv 2 ]

set timeout 30

#spawn ssh ${user}@${host} "rm -rf ~/.ssh/id_rsa*"
#
#expect {
# "*yes/no" { send "yes\r"; exp_continue }
# "*password:" { send "$pwd\r"; exp_continue }
#}

spawn ssh ${user}@${host} "ssh-keygen -t rsa"

expect {
"*yes/no" { send "yes\r"; exp_continue }
"*password:" { send "$pwd\r"; exp_continue }
"Enter file in which to save the key*" { send "\n\r"; exp_continue }
"Overwrite*" { send "y\n"; exp_continue }
"Enter passphrase (empty for no passphrase):" { send "\n\r"; exp_continue }
"Enter same passphrase again:" { send "\n\r" }
}

spawn ssh ${user}@${host} "cat ~/.ssh/id_rsa.pub"

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

expect eof

----------------------------------------------------------------------------------------------------
2)
[root@linuxidc ~]# cat noscp.exp
#!/usr/bin/expect

#noscp.exp

if {$argc<4} {
puts stderr "Usage: $argv0 localfile remotefile user passwd "
exit 1
}

set localfile [ lindex $argv 0 ]
set remotefile [ lindex $argv 1 ]
set user [ lindex $argv 2 ]
set pwd [ lindex $argv 3 ]

set timeout 30

spawn scp ${localfile} ${user}@${remotefile}

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

expect eof

------------------------------------------------------------------------

[root@linuxidc ~]# chmod 755 sshkey.exp
[root@linuxidc ~]# chmod 755 noscp.exp

(4)
脚本说明
./sshkey.exp 主机名 用户名 密码 (在远程主机生成id_rsa)
./noscp.exp 本地文件 远程路径 远程用户密码 (无密码拷贝文件)

(5)验证:
[root@linuxidc ~]# ./sshkey.exp 192.168.1.201 root PASSWORD |grep ssh-rsa >> ~/.ssh/authorized_keys
[root@linuxidc ~]# ./noscp.exp ~/.ssh/authorized_keys 192.168.1.201:~/.ssh root PASSWORD
spawn scp /root/.ssh/authorized_keys [email protected]:~/.ssh
[email protected]'s password:
authorized_keys

这样,就能无密码登陆了!
[root@linuxidc ~]# ssh 192.168.1.201
Last login: Fri Sep 23 18:33:21 2016 from 192.168.1.7
[root@vm-002 ~]#

--------------------------------------------------------------------------
如果是多台机器的话,可以结合shell脚本进行批量执行

[root@linuxidc ~]# cat /root/ip.list
192.168.1.100
192.168.1.101
192.168.1.102
192.168.1.103
192.168.1.104
......
......

[root@linuxidc ~]# cat sshkey.sh
#!/bin/bash
user='root'
password='PASSWORD'
for ip in `cat /root/ip.list`
do
/root/sshkey.exp $ip $user $password |grep ssh-rsa >> ~/.ssh/authorized_keys
/root/noscp.exp ~/.ssh/authorized_keys $user@$ip:~/.ssh root PASSWORD
done

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