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Notes on Python, Django, and web development on Ubuntu Linux

     Posts tagged "ssh"

Notes on sshfs on Ubuntu

Date: 2010-04-05  |   Modified: 2010-05-03  |   Tags: linux, ssh, ubuntu   |   2 Comments

sshfs is an easy way to mount a remote filesystem using ssh and FUSE. If your remote server is already running a ssh server that supports sftp (Ubuntu's ssh server does), there is nothing to set up on the remote server and set up on the client is relatively easy.

Other options for mounting a remote filesystem are WebDAV, Samba, and NFS. I'm no expert, but from what I've gathered, sshfs is faster than WebDAV and slower than Samba and NFS. However, Samba and NFS are typically more difficult to set up than sshfs. Here are my ...

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Python paramiko notes

Date: 2010-02-24  |   Modified: 2010-04-08  |   Tags: python, ssh

Paramiko is a Python ssh package. The following is an example that makes use of my ssh config file, creates a ssh client, runs a command on a remote server, and reads a remote file using sftp. Paramiko is released under the GNU LGPL

Install paramiko

Example

from paramiko import SSHClient, SSHConfig

# ssh config file
config = SSHConfig()
config.parse(open('/home/saltycrane/.ssh/config'))
o = config.lookup('testapa')

# ssh client
ssh_client = SSHClient()
ssh_client.load_system_host_keys()
ssh_client.connect(o['hostname'], username=o['user'], key_filename=o['identityfile'])

# run a command
print "\nRun a command ...
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A hack to copy files between two remote hosts using Python

Date: 2010-02-08  |   Modified: 2010-05-04  |   Tags: files_directories, linux, python, ssh, ubuntu   |   3 Comments

I sometimes need to copy a file (such as a database dump) between two remote hosts on EC2. Normally this involves a few steps: scp'ing the ssh keyfile to Host 1, ssh'ing to Host 1, looking up the address for Host 2, then scp'ing the desired file from Host 1 to Host 2.

I was excited to read in the man page that scp can copy files between two remote hosts directly. However, it didn't work for me. Apparently, running scp host1:myfile host2: is like running ssh host1 scp myfile host2: so I still need ...

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Wmii Python script to monitor remote machines

Date: 2009-12-22  |   Modified: 2010-03-05  |   Tags: linux, python, ssh, ubuntu, urxvt, wmii

I like to monitor our web servers by ssh'ing into the remote machine and watching "top", tailing log files, etc. Normally, I open a terminal, ssh into the remote machine, run the monitoring command (e.g. "top"), then repeat for the rest of the remote machines. Then I adjust the window sizes so I can see everything at once.

My window manager, wmii, is great for tiling a bunch of windows at once. It is also scriptable with Python, so I wrote a Python script to create my web server monitoring view. Below is my script. I also put ...

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Notes on Python Fabric 0.9b1

Date: 2009-10-04  |   Modified: 2009-10-08  |   Tags: linux, python, ssh, ubuntu   |   6 Comments

Fabric is a Python package used for deploying websites or generally running commands on a remote server. I first used Fabric about a year ago and thought it was great. Since then, Fabric has procured a new maintainer, a new domain, and a few new revisions.

Here are my notes on installing the latest stable version (0.9b1) on Ubuntu Jaunty and running a simple example.

Install Fabric 0.9b1

  • Install Easy Install & pip 
    sudo apt-get install python-setuptools python-dev build-essential
    sudo easy_install -U pip

  • Install Fabric

    Note: According to the Fabric website, the latest version of the prerequisite Python library ...

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Creating remote server nicknames with .ssh/config

Date: 2008-11-20  |   Modified: 2010-04-08  |   Tags: emacs, linux, rsync, softwaretools, ssh, ubuntu

Using the ~/.ssh/config file is an easy way to give your remote machines nicknames and reduce the number of keystrokes needed to login with ssh, rsync, hg push/pull/clone, access files via Emacs Tramp (Transparent Remote (file) Access, Multiple Protocol), or use any other SSH-based tool. You can also set other ssh options such as IdentityFile, Port, or CompressionLevel. For more information and a full list of options, check out the man page for ssh_config or this article by Kimmo Suominen.

Here is part of my ~/.ssh/config file. It defines the nicknames turk, tyran, tuna, and tally ...

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Notes on Python deployment using Fabric

Date: 2008-09-28  |   Modified: 2008-10-10  |   Tags: aws, django, linux, python, ssh, ubuntu   |   1 Comment

I found out about Fabric via Armin Ronacher's article Deploying Python Web Applications. Fabric is a Capistrano inspired deployment tool for the Python community. It is very simple to use. There are 4 main commands: local is almost like os.system because it runs a command on the local machine, run and sudo run a command on a remote machine as either a normal user or as root, and put transfers a file to a remote machine.

Here is a sample setup which displays information about the Apache processes on my remote EC2 instance.

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