20.27 分发系统介绍
分发系统介绍
- 分发系统-expect讲解(也就是一个分发的脚本)
- 场景:
- 业务越来越大,网站app,后端,编程语言是php,所以就需要配置lamp或者lnmp,最好还需要吧代码上传到服务器上;但是因为业务增加,代码增加,多台机器,就会非常麻烦;这是只需要一个分发系统,就可以把每次更新的代码发布到需要更新的服务器上
- expect,是一种脚本语言;通过他可以实现传输,输入命令(上线代码)
- 首先要准备一台模板机器,机器的IP,对应用户的密码,通过rsync同步代码,还可以通过expect去执行某些命令
20.28 expect脚本远程登录
expect脚本远程登录
-
yum install -y expect
-
自动远程登录
[root@aminglinux-02 sbin]# vim 1.expect
#! /usr/bin/expect
set host "192.168.133.132"
set passwd "123456"
spawn ssh root@$host
expect {
"yes/no" { send "yes\r"; exp_continue} //
"password:" { send "$passwd\r" }
}
interact //脚本结束
- 在expect 定义变量,用set
- 这个文件是就保证登录信息的,清空的话,重新远程登录ssh 会有提示 /root/.ssh/known_hosts
exp_continue 表示继续 \r 表示换行 interact 继续停留在这台机器,不退出
加入执行权限
[root@aminglinux-02 sbin]# ./1.expect
-bash: ./1.expect: 权限不够
[root@aminglinux-02 sbin]# chmod a+x 1.expect
- 成功登录
[root@aminglinux-02 sbin]# ./1.expect
spawn ssh [email protected]
[email protected]'s password:
Last failed login: Wed Sep 20 23:31:03 CST 2017 from 192.168.133.131 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Wed Sep 20 22:29:52 2017 from 192.168.133.1
[root@aminglinux-01 ~]# ^C
20.29 expect脚本远程执行命令
expect脚本远程执行命令
- 动远程登录后,执行命令并退出
#!/usr/bin/expect
set user "root"
set passwd "123123a"
spawn ssh [email protected]
expect {
"yes/no" { send "yes\r"; exp_continue}
"password:" { send "$passwd\r" }
}
expect "]*"
send "touch /tmp/12.txt\r"
expect "]*"
send "echo 1212 > /tmp/12.txt\r"
expect "]*"
send "exit\r"
-
expect "]" : “” 通配]右边所有字符,
-
send 执行命令
-
A 机器执行脚本
[root@aminglinux-02 sbin]# ./2.expect
-bash: ./2.expect: 权限不够
[root@aminglinux-02 sbin]# chmod a+x 2.expect
[root@aminglinux-02 sbin]# ./!$
./2.expect
spawn ssh [email protected]
[email protected]'s password:
Last login: Wed Sep 20 23:31:49 2017 from 192.168.133.131
[root@aminglinux-01 ~]# touch /tmp/12.txt
[root@aminglinux-01 ~]# echo 1212 > /tmp/12.txt
- B机器查看脚本运行的命令是否成功
[root@aminglinux-01 ~]# ls /tmp/
12.txt systemd-private-7723d189c8d3469ab732edadbbc340cb-nginx.service-eKHAIK
mysql.sock systemd-private-7723d189c8d3469ab732edadbbc340cb-vmtoolsd.service-1yxB4M
[root@aminglinux-01 ~]# cat /tmp/12.txt
1212
20.30 expect脚本传递参数
expect脚本传递参数
- 传递参数
#!/usr/bin/expect
set user [lindex $argv 0] //第一个参数
set host [lindex $argv 1] //第二个参数
set passwd "123123a"
set cm [lindex $argv 2] //第三参数
spawn ssh $user@$host
expect {
"yes/no" { send "yes\r"}
"password:" { send "$passwd\r" }
}
expect "]*"
send "$cm\r"
expect "]*"
send "exit\r"
- ./3.expect [第一个参数] [第二个参数] [第三个参数]
[root@aminglinux-02 sbin]# ./3.expect root 192.168.133.130 ls
spawn ssh [email protected]
[email protected]'s password:
Last failed login: Thu Sep 21 01:57:01 CST 2017 from 192.168.133.131 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Thu Sep 21 01:51:46 2017 from 192.168.133.1
[root@aminglinux-01 ~]# ls
anaconda-ks.cfg
- 支持多条参数
[root@aminglinux-02 sbin]# ./3.expect root 192.168.133.130 "ls;whoami;vmstat 1"
spawn ssh [email protected]
[email protected]'s password:
Last login: Thu Sep 21 01:57:21 2017 from 192.168.133.131
[root@aminglinux-01 ~]# ls;whoami;vmstat 1
anaconda-ks.cfg
root
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 1470532 876 189616 0 0 12 2 42 93 0 0 100 0 0
0 0 0 1470532 876 189616 0 0 0 0 41 91 0 1 99 0 0
0 0 0 1470532 876 189616 0 0 0 0 33 74 0 0 100 0 0
0 0 0 1470532 876 189616 0 0 0 0 37 83 0 0 100 0 0
0 0 0 1470532 876 189616 0 0 0 0 35 77 0 0 100 0 0
^C
- 因为vmstat 1 是持续运行的。所以脚本最后的exit 就没有办法执行,只能手动终止