Using Process Managers

[Dennis Yurkevich]

Hello All!

When deploying apps using GAE - is a process manager needed?

Right now I am using the Nodejs Flexible environment, and in my npm run start command -> simply running node app.js

The application seems to be live most of the time, but not sure on what the best practice is. When I was using Compute engine I also used PM2.

If the answer is that no process manager is needed it would be great to understand why also!

Any help would be great.

Thanks!

[Kenworth (Google Cloud Platform)]

It comes down to preference. It always makes sense to have a process manager running in Node.js production. It would be a better user experience to have an application restart after being down for example. Note that having a process manager will impact resources / performance.  However, if you have mission critical apps, then it would be worth the performance hit to have a PM running. 

[Dennis Yurkevich]

Thanks Kenworth.

So GAE env itself or the Docker env provides nothing of this sort?

On Thu, Jul 19, 2018 at 5:32 PM, 'Kenworth (Google Cloud Platform)' via Google App Engine <google-a...@googlegroups.com> wrote:

It comes down to preference. It always makes sense to have a process manager running in Node.js production. It would be a better user experience to have an application restart after being down for example. Note that having a process manager will impact resources / performance.  However, if you have mission critical apps, then it would be worth the performance hit to have a PM running. 

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[Julie (cloud platform support)]

How you are planning to use the Process Manager? I can check to see if that functionality is supported. 

[gnome rock]

Excuse me, What is Process Manager ?

I never used it.

On 25 Jul BE 2561, at 20:15, 'Julie (cloud platform support)' via Google App Engine <google-a...@googlegroups.com> wrote:

How you are planning to use the Process Manager? I can check to see if that functionality is supported. 

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[Dennis Yurkevich]

A process manager is something which at the very basic level restarts the app if it crashes - most popular for node is http://pm2.keymetrics.io/

@Julie, if you feel it is needed I would install PM2 and use it to start the server script instead of using node.

On Wed, Jul 25, 2018 at 2:20 PM, gnome rock <nuttakorn...@gmail.com> wrote:

Excuse me, What is Process Manager ?

I never used it.

On 25 Jul BE 2561, at 20:15, 'Julie (cloud platform support)' via Google App Engine <google-appengine@googlegroups.com> wrote:

How you are planning to use the Process Manager? I can check to see if that functionality is supported. 

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[Julie (cloud platform support)]

The decision on whether or not to include a process manager really depends on your application and if it is critical that it avoids/minimizes downtime. As mentioned by Kenworth, including one would likely improve user experience but may increase resource usage and therefore cost.

[Dennis Yurkevich]

Thank you Julie and Kenworth.

I will add one and measure the overhead.

However from my testing it seems GAE keeps the app running. Not sure if there is anything which does that or the code is awesome 😎 

Thank you for your help!

Dennis

On Thu, 26 Jul 2018 at 21:15, 'Julie (cloud platform support)' via Google App Engine <google-a...@googlegroups.com> wrote:

The decision on whether or not to include a process manager really depends on your application and if it is critical that it avoids/minimizes downtime. As mentioned by Kenworth, including one would likely improve user experience but may increase resource usage and therefore cost.

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[Kenworth (Google Cloud Platform)]

So GAE env itself or the Docker env provides nothing of this sort?

Not on GAE. For Docker, you can try look at restart policies and see if it fits your use-case.

[Dennis Yurkevich]

Thanks Kenworth so does the default docker context of GAE set any of these.

The default for docker is NO restart, which looking at my logs does not match as I can see the process restart on error. Not sure what is triggering this...

On Fri, 27 Jul 2018 at 17:58, 'Kenworth (Google Cloud Platform)' via Google App Engine <google-a...@googlegroups.com> wrote:

So GAE env itself or the Docker env provides nothing of this sort?

Not on GAE. For Docker, you can try look at restart policies and see if it fits your use-case.

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[Julie (cloud platform support)]

Can you provide the full details of the error when the restart is occurring(perhaps, a screenshot of the error) as it is not clear why a restart would be occurring.