Question

34

How to make a jar file run on startup & and when you log out?

rated 0 times [ 34] [ 0] / answers: 1 / hits: 120730 / 1 Year ago, sun, april 16, 2023, 3:44:53

I have no idea where to start looking. I've been reading about daemons and didn't understand the concept.

More details :

I've been writing a crawler which never stops and crawlers over RSS in the internet.

The crawler has been written in java - therefore its a jar right now.

I'm an administrator on a machine that has Ubuntu 11.04 .

There is some chances for the machine to crash , so I'd like the crawler to run every time you startup the machine.

Furthermore, I'd like it to keep running even when i logged out. I'm not sure this is possible, but most of the time I'm logged out, and I still want to it crawl.

Any ideas? Can someone point me in the right direction?

Just looking for the simplest solution.

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fishutt

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4 Years ago

answered 1 Year ago pipeag · Accepted Answer

Here's a easy way to do that using SysVInit. Instructions:

Create the start and the stop script of your application. Put it on some directory, in our example is:
- Start Script: /usr/local/bin/myapp-start.sh
- Stop Script: /usr/local/bin/myapp-stop.sh
Each one will provide the instructions to run/stop the app. For instance the myapp-start.sh content can be as simple as the following:
```
#!/bin/bash



java -jar myapp.jar 
```
For the stop script it can be something like this:
```
#!/bin/bash

# Grabs and kill a process from the pidlist that has the word myapp



pid=`ps aux | grep myapp | awk '{print $2}'`

kill -9 $pid
```

Create the following script (myscript) and put it on /etc/init.d.

/etc/init.d/myscript content:

#!/bin/bash

# MyApp

#

# description: bla bla



case $1 in

    start)

        /bin/bash /usr/local/bin/myapp-start.sh

    ;;

    stop)

        /bin/bash /usr/local/bin/myapp-stop.sh

    ;;

    restart)

        /bin/bash /usr/local/bin/myapp-stop.sh

        /bin/bash /usr/local/bin/myapp-start.sh

    ;;

esac

exit 0

Put the script to start with the system (using SysV). Just run the following command (as root):
```
update-rc.d myscript defaults 
```

PS: I know that Upstart is great and bla bla, but I preffer the old SysV init system.