atom-worker.service automatic reload if down

[Uwe Jung]

Hello,

I'm working with AtoM 2.4. and Ubuntu Server 16.04 and became aware that sometimes the atom-worker service will shut down. I still ignore the reasons, but it could have something to do with large export job or so.
However I prefer to reload the service automatically if down.
As I read this should be possible by adding two line to /etc/systemd/system/multi-user.target.wants/atom-worker.service. (marked in red). But doing this I needed to replace the line "Restart=no" .
My question is, if this change could have any negative impact on Gearman, AtoM or the entire OS.

Thanks

Uwe Jung



Content: /etc/systemd/system/multi-user.target.wants/atom-worker.service
-------------------------------------------------------------
[Unit]
Description=AtoM worker
After=network.target

[Install]
WantedBy=multi-user.target

[Service]
Type=simple
User=www-data
Group=www-data
WorkingDirectory=/usr/share/nginx/atom
ExecStart=/usr/bin/php -d memory_limit=-1 -d error_reporting="E_ALL" symfony jobs:worker
ExecStop=/bin/kill -s TERM $MAINPID
Restart=always
RestartSec=5
--------------------------------------------------------------

[Dan Gillean]

Hi Uwe, 

Interesting idea! I don't think we at Artefactual have ever tried anything like this ourselves, but it does sound like it could work. I would suggest that you also look into some of the other directives available in systemd - particularly ones like StartLimitIntervalSec and StartLimitBurst. If your script runs, but for some unforeseen reason the atom-worker fails to start, then systemd could get trapped in an infinite loop of try, die, try, die, etc. Exploring some of these directives should provide a workaround for this sort of edge case. See: 

• https://www.freedesktop.org/software/systemd/man/systemd.unit.html#StartLimitIntervalSec=interval
  

I would be very curious to know how this goes - please let us know once you've been using it for a while! 

Cheers, 

Dan Gillean, MAS, MLIS
AtoM Program Manager
Artefactual Systems, Inc.
604-527-2056

@accesstomemory

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[Uwe Jung]

HI Dan,

Thanks for the link. Unfortunately I could not find any typical values for these parameters. So I prefer to test with the values 60 and 12. This seems reasonable to me for the moment.

Greetings

Uwe Jung

[Unit]
Description=AtoM worker
After=network.target
StartLimitIntervalSec=60
StartLimitBurst=12  

[Install]
WantedBy=multi-user.target

[Service]
Type=simple
User=www-data
Group=www-data
WorkingDirectory=/usr/share/nginx/atom
ExecStart=/usr/bin/php -d memory_limit=-1 -d error_reporting="E_ALL" symfony jobs:worker
ExecStop=/bin/kill -s TERM $MAINPID
Restart=always
RestartSec=5
 

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[Jonathan Chu]

Hello Uwe, 

I'm currently facing the same problem as you did - my atom-worker shuts itself down automatically at some point. I would like to reload it automatically, but couldn't follow how you did that. Would you mind guide me through the steps that make this work?

Many thanks

Jonathan

[Uwe Jung]

Hello Johnathan,

thanks for the message.

The problem seems to be resolved with the modification I made inside the file /etc/systemd/system/multi-user.target.wants/atom-worker.service

Currently this file looks like this (I presume that you are running a Linux system  as well as a ordinary AtoM installation.):

[Unit]
Description=AtoM worker
After=network.target
StartLimitIntervalSec=60
StartLimitBurst=12

[Install]
WantedBy=multi-user.target

[Service]
Type=simple
User=www-data
Group=www-data
WorkingDirectory=/usr/share/nginx/atom
ExecStart=/usr/bin/php -d memory_limit=-1 -d error_reporting="E_ALL" symfony jobs:worker
ExecStop=/bin/kill -s TERM $MAINPID
Restart=always
RestartSec=5

After modification the service needs to be restarted using sudo systemctl restart atom-worker

Using sudo systemctl status atom-worker you will get a status report.

Hope this could help you.

Greetings

Uwe Jung

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