scp 免密传输

1、在需要免密的机器上生成rsa，如127.0.0.1

ssh-keygen -t rsa

2、将id_rsa.pub文件同步的另外一台机，如127.0.0.2，并且导入authorized_keys

cat ~/id_rsa.pub >> ~/.ssh/authorized_keys

完成以上操作后，可以在127.0.0.1的机器上免密传输127.0.0.2 的文件。

如果之前有做过同步，可能会报错，遇到这种错误的时候，把127.0.0.1 上的know_hosts 文件中对应的127.0.0.2 这个IP的key删除即可。

ECDSA host key for 127.0.0.2 has changed and you have requested strict checking.

附python同步代码

#!/usr/bin/env python
# encoding: utf-8
import datetime
import os
import shutil
import subprocess
import time

# 备份目录
backup_dir = "/root/db_backup"
# backup_prefix和backup_suffix分别为备份文件的前缀和后缀
backup_prefix = "db_backup"
backup_suffix = "%Y-%m-%d-%H"


# 获取备份文件名
def get_backup_filename():
    t = time.strftime(backup_suffix, time.localtime())
    return "%s_%s" % (backup_prefix, t)

cmd_template = "scp 127.0.0.2:/root/db_backup/{fileName}.zip /root/db_backup/"


# 备份指定数据库
def backup_database(fileName):
    d = {
        "fileName": fileName,
    }
    cmd = cmd_template.format(**d)
    subprocess.call(cmd, shell=True)


# 备份数据库
def backup():
    fileName = get_backup_filename()
    try:
        backup_database(fileName)
    finally:
        print('scp finished')
        #shutil.rmtree(backup_path)



if __name__ == "__main__":
    try:
        backup()
    finally:
        print('scp>>>')