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Subject: bug#36731: shepherd lost track of nginx
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Not sure who=E2=80=99s at fault here, but without doing anything weird,
I ended up with a system where shepherd thought that nginx was
stopped, while there was still an nginx process around. I
certainly didn=E2=80=99t start it by hand.
The result was this:
$ sudo herd restart nginx
Service nginx is not running.
herd: exception caught while executing 'start' on service 'nginx':
Throw to key `srfi-34' with args `("#<condition &invoke-error [program: =
\"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\" =
arguments: (\"-c\" =
\"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \"-p\" =
\"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f] =
147e000>")=E2=80=99.
That error message could also be clearer about what=E2=80=99s going on. =
At any
rate, after I killed the nginx process, =E2=80=9Cherd start nginx=E2=80=9D=
worked fine.
I should add that nginx was still doing its job fine before I killed it.
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Robert Vollmert <rob@HIDDEN> Subject: bug#36731: Acknowledgement (shepherd lost track of nginx) Message-ID: <handler.36731.B.156355498130949.ack <at> debbugs.gnu.org> References: <E22C505B-4E64-4489-AE9C-8B19254B2BBD@HIDDEN> X-Gnu-PR-Message: ack 36731 X-Gnu-PR-Package: guix Reply-To: 36731 <at> debbugs.gnu.org Date: Fri, 19 Jul 2019 16:50:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 36731 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 36731: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D36731 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#36731: shepherd lost track of nginx
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Vollmert's message of "Fri, 19 Jul 2019 18:49:32 +0200")
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Hello,
Robert Vollmert <rob@HIDDEN> skribis:
> Not sure who=E2=80=99s at fault here, but without doing anything weird,
> I ended up with a system where shepherd thought that nginx was
> stopped, while there was still an nginx process around. I
> certainly didn=E2=80=99t start it by hand.
Did you try =E2=80=9Cherd status nginx=E2=80=9D to see shepherd=E2=80=99s n=
otion of the nginx
process?
> The result was this:
>
> $ sudo herd restart nginx
> Service nginx is not running.
> herd: exception caught while executing 'start' on service 'nginx':
> Throw to key `srfi-34' with args `("#<condition &invoke-error [program: \=
"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\" argu=
ments: (\"-c\" \"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \=
"-p\" \"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f] 1=
47e000>")=E2=80=99.
Do you use an =E2=80=9Copaque=E2=80=9D nginx config file, or do you use <ng=
inx-...>
records?
In the former case, the =E2=80=98start=E2=80=99 method won=E2=80=99t attemp=
t to read the PID
file (because it cannot be sure it=E2=80=99ll exist), so it=E2=80=99s effec=
tively unable
to track the process. See comment in =E2=80=98nginx-shepherd-service=E2=80=
=99.
> That error message could also be clearer about what=E2=80=99s going on. A=
t any
> rate, after I killed the nginx process, =E2=80=9Cherd start nginx=E2=80=
=9D worked fine.
I agree that we could and should improve the error message. Redirecting
nginx=E2=80=99s stderr so that shepherd clients can see it would be best.
Thanks,
Ludo=E2=80=99.
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Subject: bug#36731: shepherd lost track of nginx
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> On 20. Jul 2019, at 00:49, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>=20
> Hello,
>=20
> Robert Vollmert <rob@HIDDEN> skribis:
>=20
>> Not sure who=E2=80=99s at fault here, but without doing anything =
weird,
>> I ended up with a system where shepherd thought that nginx was
>> stopped, while there was still an nginx process around. I
>> certainly didn=E2=80=99t start it by hand.
>=20
> Did you try =E2=80=9Cherd status nginx=E2=80=9D to see shepherd=E2=80=99=
s notion of the nginx
> process?
Not at the time, no.
>=20
>> The result was this:
>>=20
>> $ sudo herd restart nginx
>> Service nginx is not running.
>> herd: exception caught while executing 'start' on service 'nginx':
>> Throw to key `srfi-34' with args `("#<condition &invoke-error =
[program: =
\"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\" =
arguments: (\"-c\" =
\"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \"-p\" =
\"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f] =
147e000>")=E2=80=99.
>=20
> Do you use an =E2=80=9Copaque=E2=80=9D nginx config file, or do you =
use <nginx-...>
> records?
The latter I think:
(service nginx-service-type
(nginx-configuration
(extra-content =E2=80=9C=E2=80=A6=E2=80=9D)))
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Subject: bug#36731: shepherd lost track of nginx
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Hi,
Robert Vollmert <rob@HIDDEN> skribis:
>>> $ sudo herd restart nginx
>>> Service nginx is not running.
>>> herd: exception caught while executing 'start' on service 'nginx':
>>> Throw to key `srfi-34' with args `("#<condition &invoke-error [program:=
\"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\" ar=
guments: (\"-c\" \"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\"=
\"-p\" \"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f]=
147e000>")=E2=80=99.
>>=20
>> Do you use an =E2=80=9Copaque=E2=80=9D nginx config file, or do you use =
<nginx-...>
>> records?
>
> The latter I think:
>
> (service nginx-service-type
> (nginx-configuration
> (extra-content =E2=80=9C=E2=80=A6=E2=80=9D)))
That=E2=80=99s actually the non-opaque variant, so shepherd should read the=
PID
file and it shouldn=E2=80=99t get it wrong. Not sure what happened.
If you can reproduce it, it would be great to gather the output of =E2=80=
=9Cherd
status nginx=E2=80=9D at the time shepherd is confused.
Thanks,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: bug#36731: shepherd lost track of nginx
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From: Mark H Weaver <mhw@HIDDEN>
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<87ef2labds.fsf@HIDDEN>
Date: Sat, 20 Jul 2019 19:07:58 -0400
In-Reply-To: <87ef2labds.fsf@HIDDEN> ("Ludovic
\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
\=\?utf-8\?Q\?s\?\= message of "Sat, 20 Jul 2019 00:49:03 +0200")
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Hello,
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> Robert Vollmert <rob@HIDDEN> skribis:
>
>> The result was this:
>>
>> $ sudo herd restart nginx
>> Service nginx is not running.
>> herd: exception caught while executing 'start' on service 'nginx':
>> Throw to key `srfi-34' with args `("#<condition &invoke-error
>> [program:
>> \"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\"
>> arguments: (\"-c\"
>> \"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \"-p\"
>> \"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f]
>> 147e000>")=E2=80=99.
[=E2=80=A6]
>> That error message could also be clearer about what=E2=80=99s going on. =
At any
>> rate, after I killed the nginx process, =E2=80=9Cherd start nginx=E2=80=
=9D worked fine.
>
> I agree that we could and should improve the error message.
On the subject of this error message, why was the &invoke-error
condition serialized to a string before apparently being embedded within
another exception? In other words, why did it print:
Throw to key `srfi-34' with args `("#<condition &invoke-error [program: \=
"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\" argu=
ments: (\"-c\" \"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \=
"-p\" \"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f] 1=
47e000>")=E2=80=99.
instead of something closer to:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: "/=
gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx" argumen=
ts: ("-c" "/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf" "-p" "/v=
ar/run/nginx") exit-status: 1 term-signal: #f stop-signal: #f] 147e000>)=E2=
=80=99.
We may want to go further in this specific case to make a user-friendly
error message, but in the more general case of printing arbitrary
exceptions, eliminating that second layer of string serialization would
help make the error reports a bit nicer to read.
What do you think?
Mark
X-Loop: help-debbugs@HIDDEN
Subject: bug#36731: shepherd lost track of nginx
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Hi Mark,
Mark H Weaver <mhw@HIDDEN> skribis:
> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>
>> Robert Vollmert <rob@HIDDEN> skribis:
>>
>>> The result was this:
>>>
>>> $ sudo herd restart nginx
>>> Service nginx is not running.
>>> herd: exception caught while executing 'start' on service 'nginx':
>>> Throw to key `srfi-34' with args `("#<condition &invoke-error
>>> [program:
>>> \"/gnu/store/mlg0xfbiq03s812rm3v7mrlhyngas4xp-nginx-1.17.1/sbin/nginx\"
>>> arguments: (\"-c\"
>>> \"/gnu/store/r6gl9n7pwf4npiri05qxr40vdihdm2yy-nginx.conf\" \"-p\"
>>> \"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f]
>>> 147e000>")=E2=80=99.
>
> [=E2=80=A6]
>
>>> That error message could also be clearer about what=E2=80=99s going on.=
At any
>>> rate, after I killed the nginx process, =E2=80=9Cherd start nginx=E2=80=
=9D worked fine.
>>
>> I agree that we could and should improve the error message.
>
> On the subject of this error message, why was the &invoke-error
> condition serialized to a string before apparently being embedded within
> another exception?
That serialization comes from the Shepherd when it talks to its clients
(see =E2=80=98write-reply=E2=80=99 in (shepherd comm)).
Normally service methods should write a human-readable message instead
of throwing an exception, but when that happens, shepherd serializes
those things so that one can at least diagnose the problem.
In this case we could use =E2=80=98report-invoke-error=E2=80=99 from (guix =
build utils)
on =E2=80=98core-updates=E2=80=99.
Thanks,
Ludo=E2=80=99.
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