CODEWITHSUNDEEP
pythonssh
qingkunl
qingkunl

Reputation: 71

python cannot find module when using ssh

I'm using python on servers. When I run a python command which needs numpy module, if I do

ssh <server name> <python command>

that server will complain no module named numpy found.

However, if I first ssh to that server by

ssh <server name>

then run that python command on that server

<python command>

everything will be ok.

This means that server has already been installed numpy module， and it just cannot find the module without my logging on it.

Any guess of what the problem could be?

Thanks

Add:

sorry for forgetting to mention that, the result I got by running

ssh <server name> which python
ssh <server name> echo $PYTHONPATH
ssh <server name> echo $PYTHONUSERBASE
ssh <server name> echo $LD_LIBRARY_PATH

are all the same as when I first ssh to the server

ssh <server name>

then run those commands

which python
echo $PYTHONPATH 
echo $PYTHONUSERBASE
echo $LD_LIBRARY_PATH

Upvotes: 6

Views: 7258

Answers (5)

ist123
ist123

Reputation: 155

Had the same issue and tried everything above.

What worked for me was changing the remote commands from python to the full path.

i.e.

1) SSH onto your remote, find out where your python is located via

2) change your command from python pyscript.py to remote/path/to/python pyscript

Upvotes: 1

sp1111
sp1111

Reputation: 798

When running cmd over ssh in one line, the .profile is not read. To test, try this:

ssh host env

Use this instead to fix this issue (quotes are compulsory):

ssh host '. ~/.profile; cmd'

eg:

ssh <server name> '. ~/.bashrc; <python command>'

Upvotes: 1

qingkunl
qingkunl

Reputation: 71

I found the problem. It is truly the problem of python path.

And the reason why I didn't find this is that, instead of doing

ssh <server name> echo $PYTHONPATH

to find all the pathes python searches modules

we should do

ssh <server name> 'echo $PYTHONPATH'

we cannot ignore the quote to check variable PYTHONPATH on server

Upvotes: 1

sampwing
sampwing

Reputation: 1268

Check and make sure that you are using the same python environment. You may be using one like /usr/bin/python when you log in, and perhaps using a different install such as /usr/local/bin/python when you are trying to run remotely.

Upvotes: 0

cwallenpoole
cwallenpoole

Reputation: 82068

Yes. It also means that your user's .bashrc has something specific in it which modifies $PATH to allow you to access extra modules. I don't like modifying path on a global level, personally, so I'll suggest the Python approach: call sys.path.append('/path/to/numpy')

Upvotes: 1

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