[systemd-devel] nss-hostname; unit "xl2tpd.service"

[Mantas Mikulėnas]

On Tue, Jun 2, 2015 at 11:47 AM, Санакоев Владимир <wladimir-san at ya.ru>
wrote:

> Hi!
>
> I'm having trouble using the Your  site "lists.freedesktop.org", also
> because my english is not forceful.
> Sorry, I'll change that.
>
> My main problem in the error unit "xl2tpd.service" and in "nss-hostname".
> The terminal displays the message to me, I can not understand. This
> terminal also displays your address and I therefore appeal for your support.
>
> I have. Debian-8. Distribution from official repository. Install from
> iso-file: debian-8.0.0-i386-DVD-1.iso.With the Implementation of protocol
> of L2TP tunnel heving Problems. Start Daemon xl2tpd is failed:
>
> This *from terminal* exited:
>
> "*Start Daemon xl2tpd is failed:*
>
> *xl2tpd.service: control process exited, code-exited, status-1*
>
> *Starting xl2tpd: Failed to start.*
>
> *DAEMON_OPTS: not found. /etc/default/xl2tpd*
>
> *Unit xl2tpd.service is Failed.*
>

The error message is a bit unclear; can you try after `export
LC_MESSAGES=en_US` or `export LC_MESSAGES=C`?

Anyway, it seems like a problem with xl2tpd itself – not systemd. Check the
system logs.

> *Successfully activated service: 'org,freedesktop.hostname1'.*
>
> *Warning: nss-hostname is not installed.*
>
> *Changing the local hostname make it unresolveable.*
>
> *Please install nss-myhostname.*"
>

This is not related to xl2tpd at all – it's just a warning printed by
"hostnamectl set-hostname".

> *My note:* I have tried to reload unit or make to enable it, is no
> result, because this unit does not exist in list. Command: 'systemctl
> list-unit-files', displays list, in which unit does not exist. But packet
> xl2tpd is installed! Files edited. What must I to make additional yet?
>

Debian's xl2tpd package doesn't actually *have* a systemd unit yet. So when
you try to `systemctl start`, it uses a virtual unit that just runs
"/etc/init.d/xl2tpd start".

> *I have questions:*
>
> 1. What is "nss-myhostname" or "nss-hostname"?
>

It is a glibc module. Glibc uses nss modules for resolving various kinds of
names (user names to UIDs, host names to IP addresses, etc), for example,
libnss_dns is used for DNS lookups, and libnss_files is used for /etc/hosts
& /etc/passwd & /etc/group.

Similarly, libnss_myhostname is a very simple module that only translates
"localhost" & the machine's own hostname to 127.0.0.1 & [::1].

Some programs require that the computer's hostname can be resolved to an IP
address, so people used to have things like "127.0.0.1 myComputer
localhost" in /etc/hosts. But it's easy to forget to update this file, so
nss-myhostname was created to make it work automatically.

> 2. *How to install* "nss-hostname"?
>

On Debian, it's the "libnss-myhostname" package. After installing it, make
sure /etc/nsswitch.conf has "hosts: files dns myhostname" or something
similar.

> 3. How  to include the unit "xl2tpd.service" in  the units list?
>

As mentioned above, this unit doesn't actually exist, so you'll have to
write it first.

> 4.*Why* terminal writes: " ...make it *unresolveable*"? I don't
> understand it. It may be need to write :  "... make it *resolvable*"?
>

The hostname is already resolvable; the warning is trying to tell you that
something could *break* it.

> 4. *DAEMON_OPTS = " "* ? Probably, the value of this "DAEMON_OPTS" need
> to write in file: /*etc/default/xl2tpd *? If is so, I don't know, what
> must to write. My provider also can't help me.
>

The variable just contains the options that will be passed to
/usr/sbin/xl2tpd, for example:

DAEMON_OPTS="-c /etc/xl2tpd/xl2tpd.conf"

But usually xl2tpd doesn't need any special options, I think.

-- 
Mantas Mikulėnas <grawity at gmail.com>
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