Shane AO  

Problem: Keyheader Check / ao keyheader

Manifestation(s):

• Electronic mail (from turk@ucolick.org with subject: Keyheader Check with content of the following form:
  

   
     saomot.ORIENTATION: OnTelescope 
      
     Missing keyheader heartbeats on covert.ucolick.org: 
      
     Heartbeat lost	met3.DISP0CLK 
     Heartbeat lost	slinelamp.LLPHEART 
     Heartbeat lost	shawcs.DISPCLK 
      
     If the above services are running, then the problem 
     probably lies with aokeyheader, which you should 
     restart on covert, like so: 
     ao restart keyheader 
      
     (This script ran as user turk on host covert.ucolick.org) 
     

Solution/Recovery:

• user@covert > ao restart keyheader
• If response is of the following form:

   
     ao_keyheader    : turk sending SIGTERM to pid:  3537 
     .. 
     Failed to stop ao_keyheader: waited for 2 seconds, but some of pids={ 3537 } were still running. 
     

  Then, as root, kill pre-existing process:

  root@covert > kill -9 <PID>

  And, once again as user, attempt to re-start the process:

  user@covert > ao restart keyheader

Cause(s):

• Intermittent network/communication connectivity (e.g. damaged ethernet cable).

Reference(s):

• None.

Modification(s):

2022-07-12: First version.