mirror of
https://github.com/kennethreitz/python-guide.git
synced 2026-06-05 23:00:18 +00:00
Steve Pulec
87 lines
2.1 KiB
ReStructuredText
87 lines
2.1 KiB
ReStructuredText
Systems Administration
|
|
======================
|
|
|
|
Fabric
|
|
------
|
|
|
|
Fabric is a library for simplifying system administration tasks. While Chef
|
|
and Puppet tend to focus on managing servers and system libraries,
|
|
fabric is more focused on application level tasks such as deployment.
|
|
|
|
Install Fabric:
|
|
|
|
::
|
|
|
|
$ pip install fabric
|
|
|
|
The following code will create two tasks that we can use: ``memory_usage`` and
|
|
``deploy``. The former will output the memory usage on each machine. The
|
|
latter will ssh into each server, cd to our project directory, activate the
|
|
virtual environment, pull the newest codebase, and restart the application
|
|
server.
|
|
|
|
::
|
|
|
|
from fabric.api import cd, env, prefix, run, task
|
|
|
|
env.hosts = ['my_server1', 'my_server2']
|
|
|
|
@task
|
|
def memory_usage():
|
|
run('free -m')
|
|
|
|
@task
|
|
def deploy():
|
|
with cd('/var/www/project-env/project'):
|
|
with prefix('. ../bin/activate'):
|
|
run('git pull')
|
|
run('touch app.wsgi')
|
|
|
|
With the previous code saved in a file named fabfile.py, we can check memory
|
|
usage with:
|
|
|
|
::
|
|
|
|
$ fab memory_usage
|
|
[my_server1] Executing task 'memory'
|
|
[my_server1] run: free -m
|
|
[my_server1] out: total used free shared buffers cached
|
|
[my_server1] out: Mem: 6964 1897 5067 0 166 222
|
|
[my_server1] out: -/+ buffers/cache: 1509 5455
|
|
[my_server1] out: Swap: 0 0 0
|
|
|
|
[my_server2] Executing task 'memory'
|
|
[my_server2] run: free -m
|
|
[my_server2] out: total used free shared buffers cached
|
|
[my_server2] out: Mem: 1666 902 764 0 180 572
|
|
[my_server2] out: -/+ buffers/cache: 148 1517
|
|
[my_server2] out: Swap: 895 1 894
|
|
|
|
and we can deploy with:
|
|
|
|
::
|
|
|
|
$ fab deploy
|
|
|
|
Additional features include parallel execution, interaction with remote
|
|
programs, and host grouping.
|
|
|
|
Chef
|
|
----
|
|
|
|
.. todo:: Write about Chef
|
|
|
|
Puppet
|
|
------
|
|
|
|
.. todo:: Write about Puppet
|
|
|
|
Blueprint
|
|
---------
|
|
|
|
.. todo:: Write about Blueprint
|
|
|
|
Buildout
|
|
--------
|
|
|
|
.. todo:: Write about Buildout |