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I am trying to execute a script on a remote host using a detached screen session. I tried out the example Fabric gives and unfortunately couldn't get it to work.
from fabric.api import run
def yes():
run('screen -d -m "yes"')
Executing fab yes on my local machine correctly connects it to the remote host and says the command has been run, however nothing is executed on the remote host. Trying screen -d -m "yes" on either machine works as expected.
If anyone could point out what I'm doing wrong I'd greatly appreciate it. Also, on a side note, why are there quotes around the yes in the command? Would it work without the quotes? Thanks!
386
Ctrl-a + d: It detach a screen session without stopping it. Ctrl-a + r: It reattach a detached screen session.
There are 2 (two) ways to leaving the screen. First, we are using “Ctrl-A” and “d” to detach the screen. Second, we can use the exit command to terminating the screen. You also can use “Ctrl-A” and “K” to kill the screen.
Detaching screen means exit from screen but you can still resume the screen later. To resume screen you can use screen -r commmand from the terminal.
run('screen -d -m yes; sleep 1') works.
Not sure if Fabric or screen are to blame for this behaviour though.
189
Although AVB answer is perfect I'll add a small tip which may help someone like me. If you want to run more than one command put them to a executable file.
This will not work:
run('screen -d -m "./ENV/bin/activate; python run.py; sleep 1"')
So create a run.sh file:
#!/bin/bash
source ENV/bin/activate
python run.py
And use it like run('screen -d -m ./run.sh; sleep 1')
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