logs for Prometheus and Alertmanager

[rs vas]

How to configure Prometheus and Alertmanager write logs into a file?

I could not find any thing as argument to pass https://github.com/prometheus/alertmanager/blob/master/cmd/alertmanager/main.go#L186

Thank!

Vas

[Christian Hoffmann]

Hi,

Those binaries log to stderr, as do many other modern services.

The usual setup consists of running Prometheus via some service
supervisor (e.g. systemd) or container runtime (Docker).
Those systems usually support a way to capture those standardized logs
and forward them to some place of your liking (e.g. systemd's journald,
syslog, etc.).

How is Prometheus started in your case?

Kind regards,
Christian

[rs vas]

using systemd as a service.

[rs vas]

Thanks Chris,

it is like configure as part of the service configuration?

StandardOutput=/var/log/log1.log
StandardError=/var/log/log2.log

[Julien Pivotto]

On 24 Feb 14:26, rs vas wrote:
> Thanks Chris,
> it is like configure as part of the service configuration?
>
> StandardOutput=/var/log/log1.log
> StandardError=/var/log/log2.log

It would be better to use journald, as the StandardError= might end up
in an ever growing file that would be erased on each service restart.

Prometheus does not use StandardOutput for its logs.

>
>
> On Monday, February 24, 2020 at 3:20:33 PM UTC-7, rs vas wrote:
> >
> > using systemd as a service.
> >
> > On Monday, February 24, 2020 at 3:12:41 PM UTC-7, Christian Hoffmann wrote:
> >>
> >> Hi,
> >>
> >> On 2/24/20 11:02 PM, rs vas wrote:
> >> > How to configure Prometheus and Alertmanager write logs into a file?
> >> >
> >> > I could not find any thing as argument to pass
> >> >
> >> https://github.com/prometheus/alertmanager/blob/master/cmd/alertmanager/main.go#L186
> >> Those binaries log to stderr, as do many other modern services.
> >>
> >> The usual setup consists of running Prometheus via some service
> >> supervisor (e.g. systemd) or container runtime (Docker).
> >> Those systems usually support a way to capture those standardized logs
> >> and forward them to some place of your liking (e.g. systemd's journald,
> >> syslog, etc.).
> >>
> >> How is Prometheus started in your case?
> >>
> >> Kind regards,
> >> Christian
> >>
> >
>

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--
(o- Julien Pivotto
//\ Open-Source Consultant
V_/_ Inuits - https://www.inuits.eu