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[LDM #TMR-136733]: Is it possible to run LDM as a Linux service?

Hi Andy,

As you've discovered, configuring systemd(8) is non-trivial. It's a complex 
system and way more than what's needed to run the LDM. Most Linux systems 
support boot-time scripts like our example at 
<https://www.unidata.ucar.edu/software/ldm/ldm-current/basics/configuring.html#boot>.
 We recommend that you use this mechanism.

> We recently forgot to start LDM after our server crashed and rebooted.  I'd 
> like to set it up to automatically restart.  I followed instructions on how 
> to create a Linux service, but the server doesn't run as expected.
> 
> Instructions I used as a guide for how to create a service: 
> https://unix.stackexchange.com/questions/478999/how-can-i-make-an-executable-run-as-a-service
> 
> Here's what I used as the /etc/systemd/system/ldm.service file:
> 
> [Unit]
> Description=ldm
> 
> [Service]
> User=ldm
> ExecStart=/home/ldm/bin/ldmadmin start
> 
> [Install]
> WantedBy=multi-user.target
> 
> Everything looked good in the log file. Here's the status output:
> 
> sudo systemctl status ldm.service
> ? ldm.service - ldm
> Loaded: loaded (/etc/systemd/system/ldm.service; disabled; vendor preset: 
> enabled)
> Active: inactive (dead)
> 
> Dec 04 22:00:49 ip-172-31-43-181 ldmadmin[17318]: Checking pqact(1) 
> configuration-file(s)...
> Dec 04 22:00:49 ip-172-31-43-181 ldmadmin[17318]:     
> /home/ldm/etc/pqact.conf: syntactically correct
> Dec 04 22:00:49 ip-172-31-43-181 ldmadmin[17318]: Checking LDM 
> configuration-file (/home/ldm/etc/ldmd.conf)...
> Dec 04 22:00:49 ip-172-31-43-181 ldmadmin[17318]: Starting the LDM server...
> Dec 04 22:11:28 ip-172-31-43-181 systemd[1]: Started ldm.
> Dec 04 22:11:40 ip-172-31-43-181 strace[19908]: Checking the product-queue...
> Dec 04 22:11:40 ip-172-31-43-181 strace[19908]: Checking pqact(1) 
> configuration-file(s)...
> Dec 04 22:11:40 ip-172-31-43-181 strace[19908]:     /home/ldm/etc/pqact.conf: 
> syntactically correct
> Dec 04 22:11:40 ip-172-31-43-181 strace[19908]: Checking LDM 
> configuration-file (/home/ldm/etc/ldmd.conf)...
> Dec 04 22:11:40 ip-172-31-43-181 strace[19908]: Starting the LDM server...
> 
> However, when I went and ran 'ldmadmin watch' I was informed that the server 
> was not running.  One thing that occurs to me is that 'ldmadmin' isn't 
> actually the server, it spawns the server.  So maybe that's causing problems?
> 
> Anyway, I find it hard to believe that I'm the first person to try this.  I 
> checked the FAQ and other places and didn't see this covered, and no hits on 
> Google (no surprise).
> 
> Do you have any words of wisdom to impart?

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: TMR-136733
Department: Support LDM
Priority: Normal
Status: Closed
===================
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