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python - Python Docker SDK docker exec_run 在运行时失败

问题描述

Python 2.7.10，Docker 版本 18.03.1-ce-mac65 (24312)

这可能是我对 docker exec_run 命令的工作原理缺乏了解，但我正在努力让它工作。以下代码可以正常工作

from __future__ import print_function
import docker

if __name__ == '__main__':
    client = docker.from_env()
    image = client.images.pull('oraclelinux:7')
    container = client.containers.run('oraclelinux:7',
                                      command='ls',
                                      stderr=True,
                                      stdout=True,
                                      auto_remove=False,
                                      remove=False,
                                      detach=True
                                      )
    log = container.logs(stdout=True, stderr=True, stream=True)
    for line in log:
        print(line, end='')

    container.stop()
    print(container.status)
    container.remove()

并返回根目录中的目录列表。但是，我希望等效的以下内容失败了。

from __future__ import print_function

import docker

if __name__ == '__main__':
    client = docker.from_env()
    image = client.images.pull('oraclelinux:7')
    container = client.containers.create('oraclelinux:7',
                                         command='/bin/bash',
                                         auto_remove=False)
    container.start()

    log = container.exec_run('ls',
                             stderr=True,
                             stdout=True,
                             detach=True)

    for line in log:
        print(line, end='')

    container.stop()
    print(container.status)
    container.remove()

出现以下错误

/Users/user/PythonVirtualEnv/bin/python "/Users/user/DockerAutomation.py"
Traceback (most recent call last):
  File "/Users/user/DockerAutomation.py", line 16, in <module>
    detach=True)
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/models/containers.py", line 185, in exec_run
    resp['Id'], detach=detach, tty=tty, stream=stream, socket=socket
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/utils/decorators.py", line 19, in wrapped
    return f(self, resource_id, *args, **kwargs)
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/api/exec_api.py", line 162, in exec_start
    return self._result(res)
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/api/client.py", line 231, in _result
    self._raise_for_status(response)
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/api/client.py", line 227, in _raise_for_status
    raise create_api_error_from_http_exception(e)
  File "/Users/user/PythonVirtualEnv/lib/python2.7/site-packages/docker/errors.py", line 31, in create_api_error_from_http_exception
    raise cls(e, response=response, explanation=explanation)
docker.errors.APIError: 500 Server Error: Internal Server Error ("OCI runtime exec failed: exec failed: container_linux.go:348: starting container process caused "process_linux.go:86: executing setns process caused \"exit status 21\"": unknown")

谁能提供任何关于我可能做错了什么的见解？

编辑：虽然 Ignacio 回答了这个问题，但我添加了另一个更接近我想要做的答案（针对打开的容器运行多个命令并流式传输输出）。

标签： pythondockersdk

解决方案

感谢伊格纳西奥。我跟进了他的回应，并更接近我所追求的。我认为以下提供了一个更完整的解决方案，用于处理打开的容器、运行多个命令和流式传输输出。容器保持打开状态，直到关闭。您需要在 bash 会话上打开标准输入，否则它认为它没有任何事情可做并过早关闭。

from __future__ import print_function
from time import time
import docker

if __name__ == '__main__':
    client = docker.from_env()
    image = client.images.pull('oraclelinux:7')
    start = time()
    container = client.containers.create('oraclelinux:7',
                                         command="/bin/bash",
                                         tty=True,
                                         stdin_open=True,
                                         auto_remove=False)
    container.start()
    print('Container Started : {}'.format(container.status))
    exec_log = container.exec_run("/bin/bash -c 'for i in `seq 1 10`; do echo $i; sleep 1;done;'",
                                  stdout=True,
                                  stderr=True,
                                  stream=True)
    for line in exec_log[1]:
        print(line, end='')

    print('Container Finished outputting log : {}'.format(time() - start))
    container.stop()
    container.remove()

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