python实现动态更新远程机器列表的SSH登录脚本
在公司里, 常常要远程到很多机器上执行命令。机器列表会逐渐增多, 记忆这么多机器的IP或域名显然不是人脑所擅长的。因此, 需要保持一份SSH机器列表,从这些机器列表生成一个用于SSH到机器列表中机器的脚本, 执行该脚本就可以SSH到指定机器上。
必需文件: sshlist.txt, ssh_tpl.sh , updatessh.py ; 输出文件: ssh.sh
SSH 机器列表: sshlist.txt
127.0.0.0.1 ; 本地测试 1.1.1.1 ; 开发环境 2.2.2.2 ; 测试环境
SSH 脚本模板: ssh_tpl.sh
需要以机器列表生成的内容分别替换 ${ChooseList} 和 ${SSHList}
#!/bin/sh while [ 1 ] do echo "Choose host: " ${ChooseList} read INPUT_VALUE case "$INPUT_VALUE" in ${SSHList} *) echo -e "\033[43;31m invalid params-$INPUT_VALUE \033[0m"; ;; esac done
生成最终SSH登录脚本的 python 程序: updatessh.py
#!/usr/bin/env python # -*- coding: utf-8 -*- # ------------------------------------------------------------------------------- # Name: updatessh.py # Purpose: reads ssh list from sshlist.txt , replaces contents of ssh_tpl.sh # and finally build a ssh.sh file to ssh specific machines # # # Author: qin.shuq # # Created: # Output: ssh.sh #------------------------------------------------------------------------------- sshTplFilename = "ssh_tpl.sh" sshlistFilename = "sshlist.txt" sshscriptFilename = "ssh.sh" username = "qin.shuq" def readSSHList(): f = open(sshlistFilename) sshMachineList = [] i = 1 for line in f: sshIp, comment = tuple(line.split(';')) sshMachineList.append((i, sshIp.strip(), comment.strip())) i+=1 f.close() return sshMachineList def readFile(filename): f = open(filename) contents = '' for line in f: contents += line f.close() return contents def readSSHTpl(): return readFile(sshTplFilename) def main(): sshMachineList = readSSHList() chooseListContents = '' sshListContents = '' for (i, sshIp, comment) in sshMachineList: chooseListContents += "echo \" %d. %s ( %s ) \" \n" % (i, sshIp, comment) sshListContents += "\t%d) \n\t\tssh %s@%s\n \t\t;; \n" % (i, username, sshIp) sshtplContents = readSSHTpl() sshtplContents = sshtplContents.replace("${ChooseList}", chooseListContents).replace("${SSHList}", sshListContents) sshScriptFile = open(sshscriptFilename, 'w') sshScriptFile.write(sshtplContents) sshScriptFile.close() if __name__ == '__main__': main()
最终生成的SSH登录脚本: ssh.sh
#!/bin/sh while [ 1 ] do echo "Choose host: " echo " 1. 127.0.0.0.1 ( 本地测试 ) " echo " 2. 1.1.1.1 ( 开发环境 ) " echo " 3. 2.2.2.2 ( 测试环境 ) " read INPUT_VALUE case "$INPUT_VALUE" in 1) ssh qin.shuq@127.0.0.0.1 ;; 2) ssh qin.shuq@1.1.1.1 ;; 3) ssh qin.shuq@2.2.2.2 ;; *) echo -e "\033[43;31m invalid params-$INPUT_VALUE \033[0m"; ;; esac done
使用:
当需要添加新的SSH机器时, 加入到 sshlist.txt , 以分号隔开 ip 地址 和 注释。 然后执行 python updatessh.py 即可生成最终用于登录的 ssh.sh 脚本。
为了少敲几个字符, 可以做个软连接: ln -s ssh.sh /usr/bin/s