Managed VM and logging with gcloud-maven-plugin

[Paolo Rascuna]

Hi,

I have a java project running on Managed VM, and I use gcloud-maven-plugin to run the app locally, simply

mvn gcloud:run

I would like to see my application logs straight in the console, but so far I can only see the access logs.

The only way that I found is to login directly into the docker container and read the logs from /var/log/app_engine/ but every time I make some code change and I rebuild the docker image, the container I'm logged in of course gets destroyed and I need to log in again... quite a long process so.

I also tried to add more parameters, like

mvn -Dgcloud.log_level=debug -Dgcloud.enable_mvm_logs -X gcloud:run

but still no luck.

Do you guys have any suggestion?

[Les Vogel]

There are changes coming to improve things in the next few weeks.  In the mean time, here's what I do:

Make sure .level=INFO or what you need in your logging.properties .  For the class(es) I'm working with I set the class logging explicitly to: com.example.bigtable.managedvms.level=ALL

Then in a separate window, I run the following script on my Mac:

#!/bin/bash

docker logs -f `docker ps -q`

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[Paolo Rascuna]

Thank you Les, but that's not working for me... I tried that already, but that's the docker logs output

$ docker logs -f `docker ps -q`
Info: Limiting Java heap size to: 1456M
Running locally and DBG_ENABLE is set, enabling standard Java debugger agent
Listening for transport dt_socket at address: 5005
2015-06-04 09:05:08.860:INFO::main: Logging initialized @571ms
2015-06-04 09:05:09.001:INFO::main: Redirecting stderr/stdout to /var/log/app_engine/STDERR.2015_06_04.log//var/log/app_engine/STDOUT.2015_06_04.log

[Les Vogel]

The important thing was setting the classes your interested in logs for in your: logging.properties if you don't do that, you won't see anything.

From one of mine:

# Set the default logging level for all loggers to INFO

.level = INFO

# Loggers 

com.example.bigtable.managedvms.level=ALL

org.apache.http.level=OFF

org.apache.http.wire.level=OFF

com.google.apphosting.repackaged.org.apache.http.wire.level=OFF

com.google.apphosting.vmruntime.VmAppLogsWriter.level=OFF

com.google.apphosting.vmruntime.VmApiProxyDelegate=OFF

com.google.apphosting.vmruntime.level=OFF

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[Nick (Cloud Platform Support)]

Hey Les,

Some of the lines in that logging.properties example are quite interesting. Are they documented anywhere in relation to Managed VMs?

Thanks,

Nick

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[Les Vogel]

Not that I'm aware of, but the source code can be found at https://github.com/GoogleCloudPlatform/appengine-java-vm-runtime/  It's just the messages I didn't want to see in my debug logs.

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[Paolo Rascuna]

Thanks Les, but I already have such lines in my logging.properties and these lines in my appengine-web.xml

    <!-- Configure java.util.logging -->

    <system-properties>

        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>

    </system-properties>

At this point I'm afraid the the logging.properties is not being read (even though, logging into the docker container (docker exec -ti `docker ps -q` bash ) I can see the file in /home/vmagent/appengine-java-vmruntime/webapps/root/WEB-INF

[Les Vogel]

Try changing it to "/app/WEB-INF/logging.properties"

Les

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[Paolo Rascuna]

I'm afraid, that didn't help.

[Les Vogel]

One last try, you had it in your email,   /home/vmagent/appengine-java-vmruntime/webapps/root/WEB-INF/logging.properties

<property name="java.util.logging.config.file" value="/home/vmagent/appengine-java-vmruntime/webapps/root/WEB-INF/logging.properties"/>

If the full path doesn't work, I don't know what else to suggest to you.

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[Ludovic Champenois]

On 6/11/15 8:24 AM, 'Les Vogel' via Google App Engine wrote:

One last try, you had it in your email,   /home/vmagent/appengine-java-vmruntime/webapps/root/WEB-INF/logging.properties

<property name="java.util.logging.config.file" value="/home/vmagent/appengine-java-vmruntime/webapps/root/WEB-INF/logging.properties"/>

If the full path doesn't work, I don't know what else to suggest to you.

Maybe file a bug... Maybe MVM is not setting the defaut current directory to the root of the app?

Ludo

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[Paolo Rascuna]

Didn't work either... With either mvm enabled or not. 

I can see that the appengine-web.xml gets updated inside the container, but nothing changes apparently

...

[Les Vogel]

I've written it up as a bug. 

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