On 07/21/2010 03:24 AM, Toshio Kuratomi wrote:
I have a few requests for things to add to that page :-)
* What replaces chkconfig
systemd-install
Now first the gotcha then I'll provide chkconfig replacement example.
Admins will need to know that they have to use chkconfig for services
that do not have a native systemd $service file. ( legacy for services )
And as the general rule goes "native configuration breaks legacy
configuration" so if a native systemd $service file does exist than
changing service via chkconfig no longer will work.
Now the systemd developers could add a little pony to speed up adoption
and prevent potential chkconfig Admin/User fiasco by simply letting
systemd-install fallback to chkconfig if it finds no native service file
in /lib/systemd/system/ with msg to stdout asking Admins to file a bug
against a given missing service.
Admins/Users could then stop using chkconfig and use systemd-install
only instead which would speed up adobtion
Systemd-install examples ( see man page for detail list of options )
To see running targets on your system.
systemctl list-units --type=target
To see all available running targets on your system.
systemctl list-units --type=target --all
To see which native systemd system files exist on your installed system
ls /lib/systemd/system/
To enable service ( chkconfig $service on )
systemd-install enable $service.service
To disable service ( chkconfig $service off )
systemd-install disable $service.service
To enable service and start it ( chkconfig $service on && service
$service start )
systemd-install --realize=yes enable $service.service
To always start service on boot instead of when a connection comes in or
some hardware is plugged in.
ln -sf /lib/systemd/system/foobar.service
/etc/systemd/system/multi-user.target.wants/foobar.service
Remember to reload the systemd manager
systemctl daemon-reload
So to enable avahi-daemon
systemd-install enable avahi-daemon.service
To disable avahi-daemon
systemd-install disable avahi-daemon.service
To enable avahi-daemon and start it
systemd-install --realize=yes enable avahi-daemon.service
To always start avahi-daemon on boot
ln -sf /lib/systemd/system/avahi-daemon.service
/etc/systemd/system/multi-user.target.wants/avahi-daemon.service
Reload the systemd manager
systemctl daemon-reload
* What replaces /etc/init.d/SERVICENAME start | stop ?
systemctl.
systemctl examples ( sem man pages for detail list of options )
Replacing traditional /sbin/service with systemctl
To list running services
systemctl list-units --type=service
To list all available services
systemctl list-units --type=service --all
To start a service
systemctl start $foo.service
To stop a service
systemctl stop $foo.service
To reload a service .conf file.
systemctl reload $foo.service
To restart a service
systemctl restart $foo.service
To show service status ( Admins should love the output from this )
systemctl status $foo.service
Using Apache as an example
Starting Apache
systemctl start httpd.service
Stopping Apache
systemctl stop httpd.service
Reloading httpd.conf
systemctl reload httpd.service
Restarting Apache
systemctl restart httpd.service
To check if Apache is running
systemct status httpd.service
I will add this ( and more ) to the page soon as can.
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