init script convertion

cbtshare · 11-23-2016, 02:02 PM

I have a script that runs on centos 6 and want to try out centos 7 I am trying to convert the script to work with systemd

original script

Code:

start on runlevel [2345]
stop on runlevel [!2345]
 
env NUM_WORKERS=20
 
pre-start script
  for i in `seq 1 $NUM_WORKERS`
  do
    start consumer-localhost N=$i
  done
end script

so far I have

Code:

### BEGIN INIT INFO
 Provides: localqueue
 Default-Start:  2 3 4 5
 Default-Stop: 0 1 6
 Short-Description: start and stop service rabbitmq servers
 Description: worker process to start multiple consumers - q9 mt03 local queue

Environment NUM_WORKERS=20
ExecStartPre
	for i in `seq 1 $NUM_WORKERS`
  		do
    	start consumer-localhost N=$i
  	done
ExecStopPost
### END INIT INFO

### END INIT INFO

Ratamahatta · 11-23-2016, 02:50 PM

I've written init scripts on SuSE/openSUSE and Debian based systems. There were different steps to take and different options to set to create an init script on those unrelated systems. CentOS appears even more different, so I really can't do much more than post this link which I think is quite good:
https://techarena51.com/index.php/ho...t-on-centos-6/
This is for CentOS 6 though, not 7. I have no idea what might have changed.
Good luck and happy hacking!

AwesomeMachine · 11-23-2016, 09:27 PM

I usually just look at one of the other scripts and copy it, making the necessary changes. Most distros have a program to convert sysvinit scripts to systemd.

cbtshare · 11-24-2016, 09:25 AM

Quote:

Originally Posted by AwesomeMachine

I usually just look at one of the other scripts and copy it, making the necessary changes. Most distros have a program to convert sysvinit scripts to systemd.

Thank you, but I been trying to find a similar example to the init.d script but cant find any, with the pre script, post script env variable and for loop.

TB0ne · 11-24-2016, 11:30 AM

Quote:

Originally Posted by cbtshare

Thank you, but I been trying to find a similar example to the init.d script but cant find any, with the pre script, post script env variable and for loop.

Really? Because the documentation is extensive, and examples are plentiful. Putting "systemd init script" into Google pulls up:
https://access.redhat.com/documentat...nit_Files.html

...a fairly comprehensive guide. Pay particular attention to the "ExecStartPre" and "ExecStartPost" directives.