Posted: June 12th, 2021

Python ssh with paramiko | information technology | University of New Hampshire

 

We have exercised SSH by using the command line program in order to access a remote Linux server.

Now, we further explore doing so via programmatic means in Python.

Check out this article (Links to an external site.).

It provides a comprehensive wrapper for doing things over SSH such as uploading and download files (via SCP) as well as executing remote commands.  It references this github repository (Links to an external site.).  However, it is not as “conda friendly” as it should be and has a bug. 

Use the following instructions to successfully execute the code.

  1. clone the repository and change directory into it
    $ git clone https://github.com/hackersandslackers/paramiko-tutorial.git (Links to an external site.)
    $ cd paramiko-tutorial
  2. Add this environment.yml downloadfile to the repository
  3. Create and activate your environment (if you already have a comp835 env, update the name in the yml file accordingly) $ conda env create -f environment.yml
    $ conda activate comp835
  4. Add a .env file to the root directory which looks like the following with your respective environment variables replaced: REMOTE_HOST=3.90.20.34
    REMOTE_USERNAME=unhusernamelogin
    REMOTE_PASSWORD=
    SSH_KEY_FILEPATH=/Path/To/Comp835/Private/Key/comp835s21m1
    REMOTE_PATH=/home/unhusernamelogin
  5. Replace this snippet from paramiko_tutorial/__init__.py      remote.execute_commands(
             [
                “cd /var/www/ && ls”,
                “tail /var/log/nginx/access.log”,
                “ps aux | grep node”,
                “cd /uploads/ && ls”,
             ]
         )
    with simply this: remote.execute_commands(
             [
                “ls -l”,
             ]
         )
  6. Then replace line 106 in paramiko_tutorial/client.py.  From: stdin, stdout, stderr = self.client.exec_command(cmd)
    to stdin, stdout, stderr = self.connection.exec_command(cmd)
  7. And then execute the main python main.py

If needed, use a “git status” and “git diff” to confirm your changes.  Note that the .gitignore will ignore the .env. 
It should look like this:

(comp835) Tims-MacBook-Pro:paramiko-tutorial proftim$ git status
On branch master
Your branch is up to date with 'origin/master'.
Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
    modified:   paramiko_tutorial/__init__.py
    modified:   paramiko_tutorial/client.py

Untracked files:
  (use "git add <file>..." to include in what will be committed)
    environment.yml

For your submission, provide the git diff output as well as the output from successfully having run the code in a rich text document (rtf file format). 

Attempt 1Comments
 

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