Monolog logging handler for Managed VMs

[tmatsuo]

I'm thinking to write a monolog logging handler for Managed VMs, which is equivalent to this:
https://github.com/GoogleCloudPlatform/appengine-python-vm-runtime/pull/18/files

Does it make sense to have this logging handler in this repo?

[bshaffer]

It might be more appropriate to put in https://github.com/GoogleCloudPlatform/appengine-php-sdk

[JustinBeckwith]

I'd rather see us write a proper cloud logging veneer in PHP, and then have
a thin monolog handler on top of that. There's an existing veneer for Go:

https://github.com/GoogleCloudPlatform/gcloud-golang/tree/master/logging

The Python code we're looking at writes files to a magic directory that
Managed VMs uses with fluentd. It will only work on App Engine. If we
build cloud logging support into the veneer, then build monolog on top of
that - it will work from anywhere (k8s, compute, aws).

On Fri, Nov 6, 2015 at 4:27 PM, Brent Shaffer [email protected]
wrote:

It might be more appropriate to put in
https://github.com/GoogleCloudPlatform/appengine-php-sdk

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Justin Beckwith | Google Cloud Platform | @JustinBeckwith
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[bshaffer]

Currently the AppEngine Logs API uses syslog. Perhaps the veneer library (and also the Google PHP Client library) should detect AppEngine and use monolog's syslog handler when present.

[JustinBeckwith]

That's the App Engine v1 API :/ App Engine Managed VMs writes log files in a JSON
format to a magic path on disk. There's a fluentd agent that picks up the
log entries and shuffles them over to cloud logging.

There are a few options brewing here:

• Use monolog + a veneer that writes straight to cloud logging
• Use monolog + fluentd (https://github.com/nrk/monolog-fluent)
• Use monolog + syslog + fluentd (
  http://docs.fluentd.org/articles/in_syslog)

Do PHP developers expect to be able to just write straight to syslog?
Papertrail seems to think this is important:
http://help.papertrailapp.com/kb/configuration/configuring-centralized-logging-from-php-apps/

Monolog+fluentd (no syslog support) would be consistent with what we're
doing with other languages.

[mcrumm]

Is this possible on Container Engine, currently? I've been experimenting with monolog-fluentd (https://github.com/nrk/monolog-fluent), but realized after the fact that I have no way to talk to fluentd directly.

Is there a "magic path" that the fluentd agent will check on a Container Engine instance?

[tmatsuo]

Combined solutions sounds great, but I don't know the concrete specs for those.

At least on App Engine flexible environment, I know what to do. I will try to add Logging handlers for App Engine flexible environment first. We can revisit the handlers to support other platforms later.

SG?

[JustinBeckwith]

Yup, that's a good first step. Are you building a new package, or just using gcloud-php?

[tmatsuo]

I'm thinking a sub namespace Google\Cloud\Logger or something in this repo.

The code looks like:

$app['monolog.handler'] = new Google\Cloud\Logger\AppEngineFlexHandler();

The downside of this is gcloud-php will have a dependency for monolog/monolog.

I'm fine with creating another repo though.

What do you guys think?