Linux伺服器批量ssh免密登陸

1. 指令碼當前目錄下建立host_list 檔案，需要免密登陸的伺服器IP地址一行一個。
2. python3執行指令碼。

import paramiko
"""
每個伺服器的密碼都一樣
host_list檔案格式：每行一個IP地址
[root@jump tzhli]# cat host_list 
10.0.0.214
10.0.0.213
10.0.0.212
"""
user = "root"
passwd = "123"

def exec_commit(host, cmd, port=22):
    """遠端執行系統命令"""
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    #ssh.connect(hostname=host, port=port)
    ssh.connect(hostname=host, port=22, username=user, password=passwd)
    stdin, stdout, stderr = ssh.exec_command(cmd)
    res, err = stdout.read(), stderr.read()
    result = res if res else err
    ssh.close()
    return result.decode().strip()

if user == "root":
    user_home = "/root"
else:
    user_home = "/home/%s" % (user)

with open("%s/.ssh/id_rsa.pub" % (user_home),"r",encoding="utf-8") as key_file:
    pub_key = key_file.read().strip("\n")

with open("./host_list","r",encoding="utf-8") as host_flie:
    read_file_list = host_flie.readlines()

for host_str in read_file_list:
    host = host_str.strip("\n")
    if len(host) == 0:
        continue
    exec_commit(host=host,cmd="echo %s >> %s/.ssh/authorized_keys" % (pub_key,user_home))
    print("%s伺服器的公鑰已新增。" % (host))