python paramiko 设置远程ssh执行命令超时限制

使用场景：多线程批量远程执行命令，会在检查某一主机时因为未知问题会卡住(网络或IO)，需要设置超时限制，超时之后只是某个主机的命令执行失败，不影响整个程序运行。

paramiko 设置paramiko的执行命令等待超时的时间

ssh.exec_command(cmd,timeout=10)

执行命令超时会抛出异常 PipeTimeout

import paramiko

chk_ip="1.1.1.91"
chk_port="22"
chk_username="oracle"
chk_password="oracle"
chk_timeout=3

# 休眠10秒 模拟执行超时 
exec_cmd = """export LANG=EN_US.utf-8;df -h;sleep 10 """

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
# 连接超时限制
ssh.connect(chk_ip,port=chk_port,username=chk_username, password=chk_password,look_for_keys=False,timeout=chk_timeout)
# 执行命令超时限制
stdin, stdout, stderr = ssh.exec_command(exec_cmd,timeout=2)
# 在readlines的时候会抛异常 PipeTimeout
results = stdout.readlines() 
print(results)

# 如果设置为11，比预设的休眠时间多1秒，执行通过，不能抛异常
stdin, stdout, stderr = ssh.exec_command(exec_cmd,timeout=11)
results = stdout.readlines() 
print(results)

– 超时限制时，会抛出如下异常

Traceback (most recent call last):
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/channel.py", line 699, in recv
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/buffered_pipe.py", line 164, in read
paramiko.buffered_pipe.PipeTimeout

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/file.py", line 349, in readlines
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/file.py", line 291, in readline
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/channel.py", line 1361, in _read
  File "/usr/local/python3/lib/python3.9/site-packages/paramiko-2.7.2-py3.9.egg/paramiko/channel.py", line 701, in recv
socket.timeout