How to start a service upon the output of a command?

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I would like to start a specific service after another one has completely started. Specifically, I need an OpenVPN service to be up and have completed its startup to start another service.



I would normally use After= but it does not work as intended with OpenVPN, which informs that it has started right after launch and before its setup is completed.



A solution to this would be to constrain the start of my service to the output or exit status of a script(*) (or to the existence of a file which would be crated by the said script).



Is this possible with systemd?



(*) The script would ping a host known to be accessible only via the VPN tunnel and exit once connectivity is achieved (or drop a file)




systemd




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  • unix.stackexchange.com/questions/388586/…
    – jasonwryan
    Oct 15 '17 at 18:00














up vote
0
down vote

favorite












I would like to start a specific service after another one has completely started. Specifically, I need an OpenVPN service to be up and have completed its startup to start another service.



I would normally use After= but it does not work as intended with OpenVPN, which informs that it has started right after launch and before its setup is completed.



A solution to this would be to constrain the start of my service to the output or exit status of a script(*) (or to the existence of a file which would be crated by the said script).



Is this possible with systemd?



(*) The script would ping a host known to be accessible only via the VPN tunnel and exit once connectivity is achieved (or drop a file)




systemd




share|improve this question




















  • unix.stackexchange.com/questions/388586/…
    – jasonwryan
    Oct 15 '17 at 18:00












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I would like to start a specific service after another one has completely started. Specifically, I need an OpenVPN service to be up and have completed its startup to start another service.



I would normally use After= but it does not work as intended with OpenVPN, which informs that it has started right after launch and before its setup is completed.



A solution to this would be to constrain the start of my service to the output or exit status of a script(*) (or to the existence of a file which would be crated by the said script).



Is this possible with systemd?



(*) The script would ping a host known to be accessible only via the VPN tunnel and exit once connectivity is achieved (or drop a file)




systemd




share|improve this question












I would like to start a specific service after another one has completely started. Specifically, I need an OpenVPN service to be up and have completed its startup to start another service.



I would normally use After= but it does not work as intended with OpenVPN, which informs that it has started right after launch and before its setup is completed.



A solution to this would be to constrain the start of my service to the output or exit status of a script(*) (or to the existence of a file which would be crated by the said script).



Is this possible with systemd?



(*) The script would ping a host known to be accessible only via the VPN tunnel and exit once connectivity is achieved (or drop a file)





systemd





share|improve this question











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asked Oct 15 '17 at 17:19









WoJ

366113




366113











  • unix.stackexchange.com/questions/388586/…
    – jasonwryan
    Oct 15 '17 at 18:00
















  • unix.stackexchange.com/questions/388586/…
    – jasonwryan
    Oct 15 '17 at 18:00















unix.stackexchange.com/questions/388586/…
– jasonwryan
Oct 15 '17 at 18:00




unix.stackexchange.com/questions/388586/…
– jasonwryan
Oct 15 '17 at 18:00










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You can configure the service unit with



Type=notify
NotifyAccess=all


and make the last script (or a child of that) which is started by OpenVPN during initialization (wait for the desired logging output and then) call systemd-notify.






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    1 Answer
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    up vote
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    down vote













    You can configure the service unit with



    Type=notify
    NotifyAccess=all


    and make the last script (or a child of that) which is started by OpenVPN during initialization (wait for the desired logging output and then) call systemd-notify.






    share|improve this answer
























      up vote
      0
      down vote













      You can configure the service unit with



      Type=notify
      NotifyAccess=all


      and make the last script (or a child of that) which is started by OpenVPN during initialization (wait for the desired logging output and then) call systemd-notify.






      share|improve this answer






















        up vote
        0
        down vote










        up vote
        0
        down vote









        You can configure the service unit with



        Type=notify
        NotifyAccess=all


        and make the last script (or a child of that) which is started by OpenVPN during initialization (wait for the desired logging output and then) call systemd-notify.






        share|improve this answer












        You can configure the service unit with



        Type=notify
        NotifyAccess=all


        and make the last script (or a child of that) which is started by OpenVPN during initialization (wait for the desired logging output and then) call systemd-notify.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 4 '17 at 16:25









        Hauke Laging

        53.6k1282130




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