Automatically launch bash script on droplet creation?

May 13, 2014 6.2k views
jjk2sfu
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jjk2sfu
Basically, I have an image with a flask server. When I create a new droplet from it, the flask server doesn't run. It needs to be manually run. How can I make the bash script to run `python server.py` as soon as the droplet is ready instead of me having to manually ssh in or run fabric?
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2 Answers
asb MOD May 13, 2014
The best way to have something run on boot is use an init script. Assuming you are using Ubuntu, you can use Upstart to write it in a simple declarative format. A quick example might look like: 


description "Daemon for flask project"



start on (local-filesystems and net-device-up IFACE=eth0)

stop on runlevel [!12345]



# If the process quits unexpectedly trigger a respawn

respawn



setuid myuser

setgid mygroup

chdir /path/to/dir



exec  uwsgi --master \

     --processes 4 \

     --die-on-term \

     --socket /tmp/uwsgi.sock


Save the file to "/etc/init/myservice.conf" It will now launch on boot once the filesystem is mounted and the network is active. You can also manage it like other services, using: 


service myservice start

service myservice restart

service myservice stop
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roman976451 December 31, 2014

@asb : stop on runlevel [!12345] --> is that mean any runlevel except {1, 2, 3, 4, 5}

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