rc.sysinit replacement for systemd for early action

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With rhel6 / centos6 I used to set some very early actions (like changing default CPU affinity settings) in rc.sysinit early steps.



Now with rhel7/centos7 and systemd, what would be the right way for doing so?
I was thinking about adding some dedicated service constraint in early target like local-fs-pre.target.



Any comments about this will be welcome.







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    With rhel6 / centos6 I used to set some very early actions (like changing default CPU affinity settings) in rc.sysinit early steps.



    Now with rhel7/centos7 and systemd, what would be the right way for doing so?
    I was thinking about adding some dedicated service constraint in early target like local-fs-pre.target.



    Any comments about this will be welcome.







    share|improve this question





















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      With rhel6 / centos6 I used to set some very early actions (like changing default CPU affinity settings) in rc.sysinit early steps.



      Now with rhel7/centos7 and systemd, what would be the right way for doing so?
      I was thinking about adding some dedicated service constraint in early target like local-fs-pre.target.



      Any comments about this will be welcome.







      share|improve this question











      With rhel6 / centos6 I used to set some very early actions (like changing default CPU affinity settings) in rc.sysinit early steps.



      Now with rhel7/centos7 and systemd, what would be the right way for doing so?
      I was thinking about adding some dedicated service constraint in early target like local-fs-pre.target.



      Any comments about this will be welcome.









      share|improve this question










      share|improve this question




      share|improve this question









      asked Jun 14 at 14:33









      tonioc

      1,10457




      1,10457




















          1 Answer
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          You would add a new .service file to /etc/systemd/system. ExecStart= would contain your action, while Before= After=, Requires= would help specify another service or target name related to when you wanted the action to run during boot.



          References



          • man systemd.unit

          • man systemd.service





          share|improve this answer





















          • Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
            – tonioc
            Jun 14 at 14:56










          • if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
            – sourcejedi
            Jun 28 at 7:11











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          up vote
          0
          down vote













          You would add a new .service file to /etc/systemd/system. ExecStart= would contain your action, while Before= After=, Requires= would help specify another service or target name related to when you wanted the action to run during boot.



          References



          • man systemd.unit

          • man systemd.service





          share|improve this answer





















          • Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
            – tonioc
            Jun 14 at 14:56










          • if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
            – sourcejedi
            Jun 28 at 7:11















          up vote
          0
          down vote













          You would add a new .service file to /etc/systemd/system. ExecStart= would contain your action, while Before= After=, Requires= would help specify another service or target name related to when you wanted the action to run during boot.



          References



          • man systemd.unit

          • man systemd.service





          share|improve this answer





















          • Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
            – tonioc
            Jun 14 at 14:56










          • if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
            – sourcejedi
            Jun 28 at 7:11













          up vote
          0
          down vote










          up vote
          0
          down vote









          You would add a new .service file to /etc/systemd/system. ExecStart= would contain your action, while Before= After=, Requires= would help specify another service or target name related to when you wanted the action to run during boot.



          References



          • man systemd.unit

          • man systemd.service





          share|improve this answer













          You would add a new .service file to /etc/systemd/system. ExecStart= would contain your action, while Before= After=, Requires= would help specify another service or target name related to when you wanted the action to run during boot.



          References



          • man systemd.unit

          • man systemd.service






          share|improve this answer













          share|improve this answer



          share|improve this answer











          answered Jun 14 at 14:46









          Mark Stosberg

          3,4191023




          3,4191023











          • Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
            – tonioc
            Jun 14 at 14:56










          • if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
            – sourcejedi
            Jun 28 at 7:11

















          • Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
            – tonioc
            Jun 14 at 14:56










          • if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
            – sourcejedi
            Jun 28 at 7:11
















          Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
          – tonioc
          Jun 14 at 14:56




          Yes, this is what I meant by "adding some dedicated service constraint to ... ", I should have written "adding some dedicated service as a constraint to ... ". thanks.
          – tonioc
          Jun 14 at 14:56












          if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
          – sourcejedi
          Jun 28 at 7:11





          if u want to write something for local-fs-pre, i think u will need DefaultDependencies=no otherwise i think you will have an ordering cycle/contradiction
          – sourcejedi
          Jun 28 at 7:11













           

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