Re: systemctl command that is the same as chkconfig --level

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On Sat, Jun 18, 2011 at 9:18 AM, Aaron Konstam <akonstam@xxxxxxxxxxxxx> wrote:
> On Fri, 2011-06-17 at 19:01 -0400, Sam Varshavchik wrote:
>> Petrus de Calguarium writes:
>>
>>> To start it during this session:
>>> systemctl start <service name>.service
>>>
>>> To start every time you start graphical.target:
>>> systemctl enable <service name>.service
>>>
>>> I'm not sure how you would differentiate between multi-user.target and
>>> graphical.target.
>>
>> This is specified by the service unit. systemd uses a slightly different
>> paradigm. The service itself knows what system state it should be running
>> in, by default. Enabling the service puts it as a target for the state.
>
> Now II am really confused. How does a service like sshd.service know
> what system state it is to run  at

For sysvinit services, it probably looks at the "/etc/init.d/" script headers.

For example, you have to start the nfs server after installing it.

"/etc/init.d/nfs" has

--- 8< ---
chkconfig - 30 60
--- >8 ---

in its "checkconfig" header section and

--- 8< ---
Required-Start: $local_fs $network $syslog $rpcbind
Required-Stop: $local_fs $network $syslog $rpcbind
Defaul-Stop: 0 1 6
--- >8 ---

in its LSB header section.

Running "systemctl enable nfs" set it up to start in runlevels 2 3 4 5
and stop in runlevels 0 1 6 in the same way that "chkconfig nfs on"
would (in fact, since the nfs server's a legacy service, there's a
message that systemctl's handing over to chkconfig - I've forgotten
the actual wording).

Since runlevels 2 3 4 are symlinked to multi-user.target, ...

For systemd services, it probably looks at the "Unit" section of the
"*.service" files in "/lib/systemd/system/".
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