由于业务迭代更新，经常需要更改代码，如果机器很多，此时为了快速更新代码就可以使用分发系统，把更新的代码分别发布到机器上去。其中开源的上线代码的软件有很多，如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。
准备工作
1.准备1台模版机器，里面是包含有最新的代码
2.每台分发机器的IP地址和密码
3.分发系统脚本
由于分发系统的核心是使用expect，因此先实践几个例子来熟悉expect的语法命令
20.28 expect脚本远程登录
实例1.自动远程登录
expect分发主机： expect-server 192.168.1.37
expect远程主机： expect-client 192.168.1.38
1.在expect分发主机上安装expect
[root@expect-server ~]# yum -y install expect2.编辑脚本
[root@expect-server ~]# vim /usr/local/sbin/expect1.exp
//添加如下内容
#!/usr/bin/expect
#定义变量
set host "192.168.1.38"
set passwd "Aa123456"
#执行命令
spawn ssh root@$host
#与远程机器交互 截取特定信息 发送变量
expect {
"yes/no" { send "yes\r";exp_continue }
"password:" { send "$passwd\r" }
}
interact
// set 定义变量
// spawn 执行命令
// expect 使用expect语句进行交互
// \r表示回车
// exp_contunue表示继续
// interact表示继续交互
// expect eof表示停留远程机器上一会儿再退出
//为了让远程登录时候出现提示，可以清空/root/.ssh/known_hosts目录
[root@expect-server ~]# > ~/.ssh/known_hosts3.验证
//添加执行权限
[root@expect-server ~]# chmod +x /usr/local/sbin/expect1.exp
//执行脚本
[root@expect-server ~]# /usr/local/sbin/expect1.exp
spawn ssh root@192.168.1.38
The authenticity of host ‘192.168.1.38 (192.168.1.38)‘ can‘t be established.
ECDSA key fingerprint is SHA256:dpBcqagKb3dleICUyCflHVb7zukCI3ViTczb9LroVU4.
ECDSA key fingerprint is MD5:7a:2c:c5:0a:02:fc:05:f1:8c:9a:26:f6:8b:7c:76:09.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘192.168.1.38‘ (ECDSA) to the list of known hosts.
root@192.168.1.38‘s password:
Last login: Fri Aug 3 00:43:44 2018 from 192.168.1.9
//成功实现远程登录20.29 expect脚本远程执行命令
实例2.自动远程登录，并执行命令并退出
1.编辑脚本
[root@expect-server ~]# vim /usr/local/sbin/expect2.exp
//添加如下内容
#!/usr/bin/expect
set user "root"
set host "192.168.1.38"
set passwd "Aa123456"
spawn ssh $user@$host
expect {
"yes/no" {send "yes\r";exp_continue}
"password:" {send "$passwd\r"}
}
expect "]*"
send "touch /tmp/test.aa\r"
expect "]*"
send "echo 111 >/tmp/test.aa\r"
expect "]*"
send "exit\r"2.验证
[root@expect-server ~]# chmod +x !$
chmod +x /usr/local/sbin/expect2.exp
[root@expect-server ~]# /usr/local/sbin/expect2.exp
spawn ssh root@192.168.1.38
root@192.168.1.38‘s password:
Last login: Fri Aug 3 01:01:07 2018 from 192.168.1.37
[root@expect-client ~]# touch /tmp/test.aa
[root@expect-client ~]# echo 111 >/tmp/test.aa
[root@expect-client ~]# [root@expect-server ~]#
[root@expect-server ~]# /usr/local/sbin/expect1.exp
spawn ssh root@192.168.1.38
root@192.168.1.38‘s password:
Last login: Fri Aug 3 01:10:41 2018 from 192.168.1.37
[root@expect-client ~]# cat /tmp/test.aa
111
[root@expect-client ~]#
实例3.远程传递参数
1.编辑脚本
[root@expect-server ~]# vim /usr/local/sbin/expect3.exp
//添加如下内容
#!/usr/bin/expect
set user [lindex $argv 0]
set host [lindex $argv 1]
set passwd "Aa123456"
set cmd [lindex $argv 2]
spawn ssh $user@$host
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect "]*"
send "$cmd\r"
expect "]*"
send "exit\r"2.测试
[root@expect-server ~]# chmod +x !$
chmod +x /usr/local/sbin/expect3.exp
[root@expect-server ~]# /usr/local/sbin/expect3.exp root 192.168.1.38 "ls;w"
spawn ssh root@192.168.1.38
root@192.168.1.38‘s password:
Last login: Fri Aug 3 01:11:41 2018 from 192.168.1.37
[root@expect-client ~]# ls;w
anaconda-ks.cfg original-ks.cfg
01:16:30 up 39 min, 3 users, load average: 0.00, 0.01, 0.02
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.1.9 00:43 9:34 0.12s 0.10s ssh 192.168.1.37
root pts/1 192.168.1.37 01:01 9:34 0.06s 0.06s -bash
root pts/2 192.168.1.37 01:16 0.00s 0.01s 0.00s w
[root@expect-client ~]# [root@expect-server ~]#
//当要输入参数里面有多个命令是需要用""双引号括起来并使用;分号分开
//可以在命令行的后面增加set timeout 来指定命令的超时时间 -1为永远
#!/usr/bin/expect
set user [lindex $argv 0]
set host [lindex $argv 1]
set passwd "Aa123456"
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
expect "]*"
send "exit\r"
[root@expect-client ~]# [root@expect-server ~]# /usr/local/sbin/expect3.exp root 192.168.1.38 "vmstat -1"^C
[root@expect-server ~]# /usr/local/sbin/expect3.exp root 192.168.1.38 "vmstat 1"
spawn ssh root@192.168.1.38
root@192.168.1.38‘s password:
Last login: Fri Aug 3 01:20:14 2018 from 192.168.1.37
[root@expect-client ~]# vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 0 0 780968 2076 120952 0 0 38 5 70 87 0 0 100 0 0
0 0 0 780968 2076 120936 0 0 0 0 51 53 0 0 100 0 0
0 0 0 780968 2076 120936 0 0 0 0 50 43 0 0 100 0 0
0 0 0 780968 2076 120936 0 0 0 24 40 39 0 0 100 0 0
0 0 0 780968 2076 120936 0 0 0 0 72 74 0 2 98 0 0
^C[root@expect-server ~]#
//每隔1秒执行一次vmstat命令
实例4.自动同步文件
1.编辑脚本
[root@expect-server ~]# vim /usr/local/sbin/expect4.exp
//添加如下内容
#!/usr/bin/expect
set passwd "Aa123456"
spawn rsync -av root@192.168.1.38:/tmp/test.aa /tmp/
expect {
"yes/no" {send "yes\r"}
"password:" {send "$passwd\r"}
}
expect eof
//如果没有安装rsync，可以用yum -y install rsync安装2.测试
//设定执行权限
[root@expect-server ~]# chmod +x /usr/local/sbin/expect4.exp
[root@expect-server ~]# /usr/local/sbin/expect4.exp
spawn rsync -av root@192.168.1.38:/tmp/test.aa /tmp/
root@192.168.1.38‘s password:
receiving incremental file list
test.aa
sent 30 bytes received 84 bytes 228.00 bytes/sec
total size is 4 speedup is 0.04
//已经把192.168.1.38上的test.aa文件自动同步过来本机了
实例5.指定host和同步单个文件
1.编辑脚本
[root@expect-server ~]# vim /usr/local/sbin/expect5.exp
//添加如下内容
!/usr/bin/expect
set passwd "Aa123456"
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 eof2.验证
[root@expect-server ~]# chmod +x !$
chmod +x /usr/local/sbin/expect5.exp
[root@expect-server ~]# /usr/local/sbin/expect5.exp 192.168.1.38 /tmp/test.aa
spawn rsync -av /tmp/test.aa root@192.168.1.38:/tmp/test.aa
root@192.168.1.38‘s password:
sending incremental file list
test.aa
sent 91 bytes received 34 bytes 250.00 bytes/sec
total size is 4 speedup is 0.03分发系统中首先用expect编写远程同步脚本 并指定文件列表和目标IP列表 然后使用shell脚本调用expect来同步文件。
这里每台机器必须使用同样的密码才可以同步，也可以让机器之前使用密钥登录。还有让每台机器都安装上rsync
其核心命令为rsync -av --files-from=list.txt / root@host:/
1.编辑expect脚本
[root@expect-server ~]# vim /usr/local/sbin/sync.exp
//添加如下内容
#!/usr/bin/expect
set passwd "Aa123456"
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 $passwd\r}
}
expect eof
[root@expect-server ~]# chmod +x !$
chmod +x /usr/local/sbin/sync.exp
2.创建ip.list 同步机器的IP列表
[root@expect-server ~]# vim /tmp/ip.txt
//内容如下
192.168.1.383.创建file.list 需要同步文件的列表
[root@expect-server ~]# vim /tmp/file.list
//添加如下内容
/tmp/test
/tmp/test.aa4.创建 rsync.sh 脚本
[root@expect-server ~]# vim /usr/local/sbin/rsync.sh
//添加如下内容
#!/bin/bash
for i in `cat /tmp/ip.list`
do
./rsync.exp $i /tmp/file.list
done5.测试
[root@expect-server ~]# chmod +x /usr/local/sbin/rsync.sh
[root@expect-server ~]# sh +x /usr/local/sbin/rsync.sh
spawn rsync -avR --files-from=/tmp/file.list / root@192.168.1.38:/
root@192.168.1.38‘s password:
building file list ... done
tmp/
tmp/test
sent 119 bytes received 37 bytes 312.00 bytes/sec
total size is 8 speedup is 0.05
当同步完代码后有可能需要批量地重启服务，因此还需要批量远程执行命令，类似于自动化。
这里是用expect编写执行命令的脚本并用shell脚本来批量调用它。
1.编辑expect脚本
[root@expect-server ~]# vim /usr/local/sbin/execute.exp
//内容如下
#!/usr/bin/expect
set passwd "Aa123456"
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"2.编写shell脚本
[root@expect-server ~]# vim /usr/local/sbin/execute.sh
#!/bin/bash
for i in $(cat /tmp/ip.list)
do
echo $i
/usr/local/sbin/execute.exp $i "systemctl status httpd.service "
done3.测试
[root@expect-server sbin]# chmod +x /usr/local/sbin/execute.exp /usr/local/sbin/execute.sh
"execute.sh" 6L, 138C written
[root@expect-server sbin]# /usr/local/sbin/execute.sh
192.168.1.38
spawn ssh root@192.168.1.38
root@192.168.1.38‘s password:
Last login: Fri Aug 3 02:40:00 2018 from 192.168.1.37
[root@expect-client ~]# systemctl status httpd.service
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
Active: active (running) since Fri 2018-08-03 02:40:07 CST; 2min 22s ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 16668 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
Main PID: 16678 (httpd)
Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec"
CGroup: /system.slice/httpd.service
├─16678 /usr/sbin/httpd -DFOREGROUND
├─16679 /usr/sbin/httpd -DFOREGROUND
├─16680 /usr/sbin/httpd -DFOREGROUND
├─16681 /usr/sbin/httpd -DFOREGROUND
├─16682 /usr/sbin/httpd -DFOREGROUND
└─16683 /usr/sbin/httpd -DFOREGROUND
Aug 03 02:40:01 expect-client systemd[1]: Starting The Apache HTTP Server...
Aug 03 02:40:07 expect-client httpd[16678]: AH00558: httpd: Could not reliably determine the server‘s fully qualified domain name, using fe80::20c:29ff:fea7...is message
Aug 03 02:40:07 expect-client systemd[1]: Started The Apache HTTP Server.
Hint: Some lines were ellipsized, use -l to show in full.原文：https://www.cnblogs.com/linuxzhang/p/9860743.html