Talk about fabric
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Fabric is a Python library and command-line tool that allows streamlining SSH administration tasks. It can execute commands both locally and remotely on servers. Fabric provides abstractions like tasks and contexts that allow commands to be executed in parallel or sequentially on different hosts. This improves on shell scripts by separating concerns of who executes commands and where. Thinking in Fabric contexts makes tasks more reusable.
![thinking in fabric
利用 context 概念，
do something
將『指令』的『執行者』、『執行位置』抽離， which context
去掉了『雜念』的 task 更容易被 reuse，
local script who
更有機會成為任意組合的『樂高積木』
remote script where
from fabric.api import run, task, env
env.user = ‘qrtt1’
env.hosts = [‘server1’, ‘server2’]
how to execute
parallel
@task
def uptime(): sequence
run("uptime")](https://image.slidesharecdn.com/talkaboutfabric-121014112556-phpapp01/85/Talk-about-fabric-12-320.jpg)
![thinking in fabric
from fabric.api import run, task, env, roles, parallel
do something
env.user = ‘deployer’ which context
local script = {'web':['s1', 's2', 's3'], 'db':['s4']}
env.roledefs who
remote script
@task where
@roles(‘web’, ‘db’)
@parallel
def uptime():
run("uptime")
how to execute
parallel
sequence](https://image.slidesharecdn.com/talkaboutfabric-121014112556-phpapp01/85/Talk-about-fabric-13-320.jpg)
Talk about fabric
- 1. 初學 fabric qrtt1 2012.10.15
- 2. fabric 與我 我是個快樂的小 RD， 直到我膝蓋中了一 。 I am the king of the world server administrator.
- 3. Server Admin 管 server 都在玩些什麼 deploy the java web application maintain various settings on the server be a watchdog for many purposes
- 4. Shell scripts fabric 能幫你做的，用 shell scripts 也行 傳說 server admin 都要會寫 shell script
- 5. But, qrtt One 的 shell script 程度太差... #!/bin/sh python run.py
- 6. fabric http://docs.fabfile.org Fabric is a Python (2.5 or higher) library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks.
- 7. using fabric as cmd fab -H s1,s2 -- uptime fab -P -H s1,s2 -- uptime fab -w -P -H s1,s2 -- uptime fab ${OPTS} -- ${COMMANDS}
- 8. using fabric api 有 些 function 可以用！？ 看 code 比看文件更直覺 :D fabric/api.py https://github.com/fabric/fabric/blob/master/ fabric/api.py
- 10. thinking in fabric do something which context local script who remote script where how to execute parallel sequence
- 11. thinking in fabric do something which context 該做的事就如同原本寫 shell script 那般。 改用 fabric api 寫，也許只是多了一點 python 而有親切感 local script who 單純評論它，只 remote script 稍為便利罷了。 remote script where from fabric.api import run, task how to execute @task parallel def uptime(): sequence run("uptime")
- 12. thinking in fabric 利用 context 概念， do something 將『指令』的『執行者』、『執行位置』抽離， which context 去掉了『雜念』的 task 更容易被 reuse， local script who 更有機會成為任意組合的『樂高積木』 remote script where from fabric.api import run, task, env env.user = ‘qrtt1’ env.hosts = [‘server1’, ‘server2’] how to execute parallel @task def uptime(): sequence run("uptime")
- 13. thinking in fabric from fabric.api import run, task, env, roles, parallel do something env.user = ‘deployer’ which context local script = {'web':['s1', 's2', 's3'], 'db':['s4']} env.roledefs who remote script @task where @roles(‘web’, ‘db’) @parallel def uptime(): run("uptime") how to execute parallel sequence
- 14. demo {deploy by fabric} https://github.com/qrtt1/pyhug_fabric_talk fab -H s1,s2,s3 -P build_web restart_web
- 15. Q&A