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SME10 serviceControl (view source)

Revision as of 19:36, 7 December 2020

3,259 bytes added ,  19:36, 7 December 2020
→‎Previous pure Syvinit service, with a provided systemd unit
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===== Previous pure Syvinit service, with a provided systemd unit =====
 
===== Previous pure Syvinit service, with a provided systemd unit =====
 
If we are lucky we can simply use the ones provided as a replacement, we add a service.d/50koozali.conf for the service and alter it in the way we need.
 
If we are lucky we can simply use the ones provided as a replacement, we add a service.d/50koozali.conf for the service and alter it in the way we need.
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'''The template will need to be expanded for ''package''-update, bootstrap-console-save, console-save, post-install, post-upgrade at least'''
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you will need to plan a createlinks addition :<syntaxhighlight lang="perl">
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#smeserver-dovecot-update
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# services to adjust
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safe_symlink("restart", "root/etc/e-smith/events/smeserver-dovecot-update/services2adjust/dovecot");
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safe_symlink("restart", "root/etc/e-smith/events/smeserver-dovecot-update/services2adjust/rsyslog");
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# specific actions we want for this package
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event_link("adjust-dovecot", "smeserver-dovecot-update", "02");
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# systemd-specific action mandatory for this package-update event
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event_link("systemd-reload", $event, "89");
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event_link("systemd-default", $event, "88");
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# specific template we will need for this package
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templates2events("/etc/rsyslog.conf",$event);
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# systemd-specific template mandatory for this package-update event
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templates2events("/usr/lib/systemd/system/dovecot.service.d/50koozali.conf", ($event, qw(bootstrap-console-save console-save post-install post-upgrade) ));
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</syntaxhighlight>
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Usually we then create 3 fragments
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* /etc/e-smith/templates/usr/lib/systemd/system/nut-monitor.service.d/50koozali.conf/20unit
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<syntaxhighlight lang="bash">
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[Unit]
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#this could be omitted, very specific to the nut service
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PartOf=nut.service
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After=nut.service
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</syntaxhighlight>
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* /etc/e-smith/templates/usr/lib/systemd/system/nut-monitor.service.d/50koozali.conf/40service
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<syntaxhighlight lang="bash">
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[Service]
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# reset all ExecStartPre
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ExecStartPre=
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# add our own
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ExecStartPre=/sbin/e-smith/service-status nut
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# ignore this one if it fails
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ExecStartPre=-/bin/mytest
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# reset previous Start
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ExecStart=
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# do our own
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ExecStart=/bin/sv u helo
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</syntaxhighlight>
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* /etc/e-smith/templates/usr/lib/systemd/system/nut-monitor.service.d/50koozali.conf/80install
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<syntaxhighlight lang="bash">
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[Install]
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#probably the most wanted part !
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WantedBy=sme-server.target
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</syntaxhighlight>
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You will then need to create the destination path in the spec file in %build
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mkdir -p root/usr/lib/systemd/system/nut-monitor.service.d/50koozali.conf
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Finally, think to remove any remains of previous sysvinit as it might prevent the service to enable in /etc/systemd/system-preset/49-koozali.preset. to enable the service all the conditions should be met:
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* a key $key in configuration db should exist as type=service and status=enabled
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* a file $key.service should exist in /usr/lib/systemd/system/ or in /etc/systemd/system/
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* there should be no file /etc/rc.d/init.d/$key nor /etc/rc.d/init.d/supervise/$key
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{{Warning box|1=we use preset-all to enable our services, however there is a bug in systemd up to v236 (up to Rhel8). With this bug drop in configuraiton file sin *.service.d/  are ignored when systemctl search for [Install] content to do preset-all.
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As a result our WantedBy=sme-server.target are igored
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we write a replacement with systemd-default action script, but this one has also limits:
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# works only with sme-server.target
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# does not check really where is the WantedBy, if it'S elsewhere than the expected [Install] section it will use it as well
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# does not work with templated unit (@.service)}}
    
===== Previous pure Syvinit service, without a provided systemd unit =====
 
===== Previous pure Syvinit service, without a provided systemd unit =====
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As a last resort we could hide the whole file using the service.d/50koozali.conf  and simply call runit, see the next example.
 
As a last resort we could hide the whole file using the service.d/50koozali.conf  and simply call runit, see the next example.
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see [[#Previous pure Syvinit service, with a provided systemd unit]] for reference...
    
===== Previous Runit service, without a provided systemd unit =====
 
===== Previous Runit service, without a provided systemd unit =====
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