等到paramiko exec_command完成

Question

我有一个python脚本我试图安装一个rpm包，但是当我发送命令来安装它时，并不等待命令在重新启动服务之前完成。我读过很多有关使用“recv_exit_status（）”的论坛，但我认为我没有正确使用它。

这是我有：

#!/usr/bin/python 

import paramiko, os 
from getpass import getpass 

# Setting Variables 
Hosts = [ '192.168.1.1', '192.168.1.2'] #IPs changed for posting 
username = 'root' 
print 'Enter root password on remote computer:' 
password = getpass() 
port = 22 
File = 'Nessus-6.11.2-es7.x86_64.rpm' 

for host in Hosts: 
    print 'Finished copying files. Now executing on remote computer' 

    #Setting up SSH session to run commands 
    remote_client = paramiko.SSHClient() 
    remote_client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) 
    remote_client.connect(host, username=username, password=password) 

    InstallNessus = 'rpm -U --percent %s'%File 
    stdin, stdout, stderr = remote_client.exec_command(InstallNessus) 
    stdout.channel.recv_exit_status() 
    lines = stdout.readlines() 
    for line in lines: 
     print line 
    stdin, stdout, stderr = remote_client.exec_command('systemctl restart nessusd.service') 

    remote_client.close() 

Answer 1

这channel.recv_exit_status()，不stdout.channel.recv_exit_status()。

但是，由于您试图在许多服务器上运行相同的命令，类似于parallel-ssh的东西比顺序地并行地更适合并且比paramiko快得多。

代码做到这一点也更加简单，只需：

from pssh.pssh2_client import ParallelSSHClient 

hosts = ['192.168.1.1', '192.168.1.2'] 
_file = 'Nessus-6.11.2-es7.x86_64.rpm' 
cmd = 'rpm -U --percent %s' % _file 

client = ParallelSSHClient(hosts, user='<user>', password='<password>') 

output = client.run_command(cmd) 
for host, host_output in output.items(): 
    for line in host_output.stdout: 
     print "Host %s: %s" % (host, line) 
    print "Host %s exit code %s" % (host, host_output.exit_code) 

restart_out = client.run_command('systemctl restart nessusd.service') 
# Just wait for completion 
client.join(restart_out) 

进一步的信息，请参阅documentation。