Running echo command in docker container from python script doesn't work-CodePudding

I have the following code

import subprocess
import docker
import unittest

class DockerContainerHost(object):
    def execute(self, command):
        self._container.exec_run(command)

class Tester(unittest.TestCase):
    def test_twoHostsOneFile(self):
        with DockerContainerHost() as host1, DockerContainerHost() as host2:
            host1.execute('echo content > /tmp/foo')

if __name__ == '__main__':
    unittest.main()

The thing is that everything works fine, but the host1.execute('/bin/echo content > /tmp/foo') line doesn't create the file /tmp/foo. When I tried to use touch /tmp/foo command it worked, but I need to create the file with content. How to make it work? Thanks.

CodePudding user response：

Python and docker exec are not running a shell, and the redirect in 'echo content > /tmp/foo' is expecting a shell to parse the >. You can specify running this with a shell using the following syntax:

'/bin/sh -c \'echo content > /tmp/foo\''

Note that this will parse the command inside the container, so the file will be created inside that container.