20.27 分发系统介绍

公司的网站本来已经建好了，当公司的业务越来l越大时候就会需要实时更新代码，由于后端服务器有很多台来跑web服务。此时为了快速更新代码就可以使用分发系统。其中开源的上线代码的软件有很多，git等等。这里我们使用shell来编写一个分发系统来上线代码。核心使用expect脚本语言，它可以实现远程执行命令，远程传输数据等操作

20.28 expect脚本远程登录

[root@localhost ~]# yum install -y expect
[root@localhost ~]# cd /usr/local/sbin/
[root@localhost sbin]# vim expect1.exp
#!/usr/bin/expect
#定义变量
set host "192.168.32.102"
set passwd "123456789"
#执行命令
spawn ssh root@$host
#与远程机器交互，截取特定信息，发送变量,\r表示回车，interact表示继续交互不退出远程机器，expect eof表示停留远程机器上一会儿再退出
expect {
"yes/no" { send "yes\r";exp_continue }
"password:" { send "$passwd\r" }
}
interact

为了让远程登录时候出现提示，可以清空/root/.ssh/known_hosts文件

20.29 expect脚本远程执行命令

[root@localhost sbin]# vim expect2.exp
#!/usr/bin/expect
set user "root"
set host "192.168.32.102"
set passwd "123456789"
spawn ssh $user@$host
expect {
"yes/no" {send "yes\r";exp_continue}
"password:" {send "$passwd\r"}
}
expect "]*"
send "touch /tmp/test.aa\r"
expect "]*"
send "echo 111 >/tmp/test.aa\r"
expect "]*"
send "exit\r"

20.30 expect脚本传递参数

[root@localhost sbin]# vim expect3.exp
#!/usr/bin/expect
#[lindex $argv 0]表示要输入的第一个参数 如此类推
set user [lindex $argv 0]
set host [lindex $argv 1]
set passwd "123456789"
set cmd [lindex $argv 2]
spawn ssh $user@$host
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect "]*"
send "$cmd\r"
#set timeout -1
#指定命令的超时时间 -1为永远
expect "]*"
send "exit\r"
[root@localhost sbin]# ./expect3.exp root 192.168.32.102 "ls;w"

20.31 expect脚本同步文件

[root@localhost sbin]# vim expect4.exp
#!/usr/bin/expect
set passwd "123456789"
spawn rsync -av root@192.168.32.102:/tmp/test.aa /tmp/
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect eof

20.32 expect脚本指定host和要同步的文件

[root@localhost sbin]# vim expect5.exp
#!/usr/bin/expect
set passwd "123456789"
set host [lindex $argv 0]
set file [lindex $argv 1]
spawn rsync -av $file root@$host:$file
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect eof
[root@localhost sbin]# ./expect5.exp 192.168.32.102 /tmp/test

20.33 构建文件分发系统

[root@localhost sbin]# vim rsync.exp
#!/usr/bin/expect
set passwd "123456789"
set host [lindex $argv 0]
set file [lindex $argv 1]
#--file-from指定文件列表路径 -R表示同步时目标会级联创建目录
spawn rsync -avR --files-from=$file / root@$host:/
expect {
"yes/no" {send "yes\r"}
"password:" {send $passwd\r}
}
expect eof
[root@localhost sbin]# vim /tmp/ip.list
192.168.32.102
192.168.32.103
[root@localhost sbin]# vim /tmp/file.list
/tmp/test
/tmp/test.aa
[root@localhost sbin]# vim rsync.sh
#!/bin/bash
for i in `cat /tmp/ip.list`
do./rsync.exp $i /tmp/file.list
done
[root@localhost sbin]# sh rsync.sh

20.34 批量远程执行命令

[root@localhost sbin]# vim exe.exp
#!/usr/bin/expect
set passwd "123456789"
set host [lindex $argv 0]
set cmd [lindex $argv 1]
spawn ssh root@$host
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect "]*"
send "$cmd\r"
expect "]*"
send "exit\r"
[root@localhost sbin]# vim exe.sh
#!/bin/bash
for i in `cat /tmp/ip.list`
doecho $i./exe.exp $i "service nginx restart"
done
[root@localhost sbin]# sh exe.sh