Donetsk.py - fabric
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Fabric is a Python library and command-line tool for automating system administration tasks like application deployment over SSH. It allows executing shell commands on remote servers, uploading/downloading files, prompting for input, and aborting execution. Commands can target multiple hosts specified in a fabfile.py, and take per-task arguments. Context managers like cd and settings allow grouping related commands together.
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Check the other Lectures and courses in
http://Linux4EnbeddedSystems.com
or Follow our Facebook Group at
- Facebook: @LinuxforEmbeddedSystems
Lecturer Profile:
- https://www.linkedin.com/in/ahmedelarabawy
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- 2. About Fabric is a Python library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks.
- 3. Features • Executing local or remote shell commands (normally or via sudo) • Processing output • Uploading/downloading files • Prompting for input, aborting execution, etc • Multiple host, flexible configuration
- 4. Executing commands fabfile.py: from fabric.api import * env.hosts = ['no1.troolee.com'] def deploy(): with cd('cnc'): run('./update.sh') $ fab deploy $ fab -H system1,system2,system3 -- uname -a
- 5. Per-task arguments def foo(bar=‘foobar’, lorem=‘ipsum’): pass def baz(): pass $ fab foo:Hello,lorem=World baz
- 6. env vs settings from fabric.api import settings, run, env env.hosts = ['example.com'] def exists(path): with settings(warn_only=True): return run('test -e %s' % path) $ fab exists:/home $ fab exists:/home,host=‘example.net’
- 7. Operations • get/put • local/run/sudo • open_shell • prompt/require • reboot
- 8. Context Managers • cd/lcd • path/prefix • settings with prefix('workon myenv'): run('ls') with prefix('source /some/script'): run('touch a_file') $ workon myenv && ls $ workon myenv && source /some/script && touch a_file
- 9. Decorators • hosts/roles/with_settings • task • serial/parallel • with_settings • runs_once
- 10. Q&A
- 11. Thanks.
Editor's Notes
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