使用paramiko远程登录并执行命令脚本

#!/usr/bin/env python
#coding=utf-8

import paramiko, getpass,sys,traceback

class ssh_utils():
    def login_by_passwd(self, ip, port, username, passwd):
        self.ip = ip
        self.port = port
        self.username = username
        self.passwd = passwd
        self.pkey = None

    def login_by_key(self, username, key_path, passwd):
        try:
            self.pkey=paramiko.RSAKey.from_private_key_file(key_path)
        except paramiko.PasswordRequiredException:
            if not passwd:
                passwd = getpass.getpass('RSA key password: ')
            self.pkey = paramiko.RSAKey.from_private_key_file(key_path, passwd) 

    def ssh(self,shell):
        try:
            ssh = paramiko.SSHClient()
            ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            if self.pkey:
                ssh.connect(self.ip, self.port, self.username, compress = True, pkey= self.pkey)
            else:
                if not self.passwd:
                    self.passwd = getpass.getpass('input password: ')
                ssh.connect(self.ip,self.port,self.username, self.passwd)
            stdin, stdout, stderr = ssh.exec_command(shell)
            res = stdout.readlines()
            ssh.close()
            return res
        except:
            type, value, tb = sys.exc_info()
            return traceback.format_exception(type, value, tb)

    def scp(self,localpath,remotepath):
        try:
            t = paramiko.Transport((self.ip,self.port))
            if self.pkey:
                t.connect(self.ip, self.port, self.username, pkey= self.pkey)
            else:
                if not self.passwd:
                    self.passwd = getpass.getpass('input password: ')
                t.connect(username = self.username, password = self.passwd)
            sftp = paramiko.SFTPClient.from_transport(t)
            sftp.put(localpath,remotepath)
            t.close()
            return "SCP OK"
        except:
            type, value, tb = sys.exc_info()
            return traceback.format_exception(type, value, tb)

if __name__ == '__main__':
    #使用例子
    myssh = ssh_utils()
    myssh.login_by_passwd("23.83.25.18",222,"root","xiaoming.n5")
    ret = myssh.scp('/etc/fstab', '/tmp/')
    myssh.ssh("cd /tmp/ && tar -zcf fstab.tgz fstab")