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    <div class="moz-cite-prefix">Hi Gongysh:<br>
      <br>
      You are looking for mistral cron-triggers.<br>
      <br>
      See
<a class="moz-txt-link-freetext" href="https://docs.openstack.org/developer/mistral/terminology/cron_triggers.html">https://docs.openstack.org/developer/mistral/terminology/cron_triggers.html</a><br>
      <br>
      Bob<br>
      <br>
      On 3/22/2017 7:16 PM, gongys2017 wrote:<br>
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    <blockquote
      cite="mid:6815ea0b-5e6a-42f4-91cd-e5d7c5b3d511.gongys2017@aliyun.com"
      type="cite">
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        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">Hi
            mistral stackers,</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><br>
          </span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">Tacker
            is using the mistral as its part of system. Now we have a
            requirement:</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><br>
          </span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">tacker
            server registers an openstack as its NFVI, and needs to
            ping<or http-ping) the openstack's management IP,</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">for
            example the keystone URL until tacker updates or delete the
            openstack NFVI.</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><br>
          </span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">Can
            the mistral be asked to start a workflow which  contains 
            just such a kind of task:</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">for
            ever running until extenal tells him to stop.</span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><br>
          </span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><br>
          </span></div>
        <div style="clear:both;"><span
style="font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;">Thanks<br>
          </span></div>
      </div>
      <br>
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