[lttng-dev] lttng-sessiond as a CentOS 7 service

[Michael Jeanson]

On 2016-10-12 14:21, Thibault, Daniel wrote:
> Using:
> lttng-modules-stable-2.8-2.8.2-e840206
> userspace-rcu-stable-0.9-6051170
> lttng-ust-stable-2.8-cf18865
> lttng-tools-stable-2.8-2.8.2-48262f1
> on:
> Red Hat Enterprise Linux Server release 7.2 (Maipo) (RHEL 7.2 64-bits)
> Kernel 3.10.0-327.el7.x86_64
> 
> I'm having trouble with my installation of lttng-sessiond as a service.  If I run lttng-sessiond using either -b, -d, or just -vvv, it works fine (I can interrogate 'lttng list -u' from a tracing user shell and detect the process using 'ps -e | grep sessiond').
> 
> But when I launch the service, I end up with a "successfully dead" daemon:
> 
> # systemctl start lttng-sessiond
> # systemctl status lttng-sessiond
> * lttng-sessiond.service - LTTng central tracing registry session daemon
>    Loaded: loaded (/etc/systemd/system/lttng-sessiond.service; enabled; vendor preset: enabled)
>    Active: inactive (dead) since ...
>   Process: 5865 ExecStart=/usr/local/bin/lttng-sessiond -d (code=exited, status=0/SUCCESS)
>  Main PID: 5865 (code=exited, status=0/SUCCESS)
> 
> There's nothing in dmesg.
> 
> The service is set up like so:
> 
> $ sudo ln -s /etc/systemd/system/lttng-sessiond.service /etc/systemd/system/multi-user.target.wants/lttng-sessiond.service
> $ cat > ~/lttng-sessiond.service << END
> [Unit]
> Description=LTTng central tracing registry session daemon
> 
> [Service]
> Type=simple
> User=root
> ExecStart=/usr/local/bin/lttng-sessiond -d

You should remove the "-d", systemd expects the daemon to stay in the
foreground so it can monitor it.

> Restart=on-abort
> 
> [Install]
> WantedBy=multi-user.target
> END
> $ sudo mv ~/lttng-sessiond.service /etc/systemd/system/lttng-sessiond.service
> 
> What am I doing wrong?
> 
> Daniel U. Thibault, M.Sc.²
> 
> Informaticien scientifique, CME-PSC, Centre de recherches de Valcartier
> Recherche et développement pour la défense Canada / Gouvernement du Canada
> daniel.thibault at drdc-rddc.gc.ca / Tél: 418-844-4000x4245 Téléc: 418-844-4538
> daniel.thibault at forces.gc.ca / Tél: 418-844-4000x4245 Téléc: 418-844-4538
> 
> Computer Scientist, MCCS-SPC, Valcartier Research Centre 
> Defence Research and Development Canada / Government of Canada
> daniel.thibault at drdc-rddc.gc.ca / Tel: 418-844-4000x4245 Fax: 418-844-4538
> daniel.thibault at forces.gc.ca / Tel: 418-844-4000x4245 Fax: 418-844-4538
> 
> DRDC is an agency of the Department of National Defence / RDDC est une agence du ministère de la Défense nationale
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