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CE-2903: Stop IOCs from falling into restart loop

Simon Rose requested to merge simonrose/ics-ans-ccce:stop_constant_ioc_restarts into master

This switches to the latest deployment playbook which will change the mechamism used to restart IOCs so that procServ no longer handles restarts, but instead that systemd does. This will have several main impacts:

  • Improved monitoring of IOC status
  • Stop IOCs that restart indefinitely due to, e.g. missing dependencies

It will also change the behaviour of a user logged into conserver: previously, if you were logged onto an IOC console via conserver, you could restart the IOC by typing exit; this would allow you to observe the IOC start in the same console. Due to the change to systemd managing the restarts, this will no longer work; the console that you are logged onto will be killed and you will need to log on to a new console.

This information can still be obtained by (for example) watching the procServ log itself.

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