undefined method `[]' replied by cyu @ Sat, 28 Jun 2008 16:10:25 -0000

cyu — Sat, 28 Jun 2008 16:10:25 -0000

I ran into this error while setting up our Scout Client for Skribit:

F, [2008-06-28 09:00:51 #30380] FATAL -- : An HTTP error occurred:  undefined method `[]' for false:FalseClass

If you run into this error, try removing your /home/mongrel/.scout/client_history.yaml file. That worked for me.

Perhaps the client should handle the scenario where a blank client_history.yaml file is created? Not sure how it got that way.

—Calvin

cron interval replied by seebq @ Fri, 02 May 2008 22:44:22 -0000

seebq — Fri, 02 May 2008 22:44:22 -0000

Randy, that’s an excellent suggestion. It will work now, but we may in the future decide not to accept report data on the time interval. Thanks!

cron interval replied by randy @ Sat, 26 Apr 2008 20:54:37 -0000

randy — Sat, 26 Apr 2008 20:54:37 -0000

I am on the free plan but have cron set up to run every 10 minutes. It seems to be working, what happens if we leave it this way? It would be nice if we could run it more frequently to take advantage of scripts that monitor and restart services, but have it only accept reports at the time intervals allowed.

Scout Performance Impact replied by seebq @ Sat, 26 Apr 2008 02:00:23 -0000

seebq — Sat, 26 Apr 2008 02:00:23 -0000

Also, if you’re worried about CPU cycles being stolen by Scout, you can always run scout using nice to give it a low priority:

/usr/bin/nice -n 10 /usr/bin/scout

We’ve found the performance impact to be very very low, nonetheless.

Scout Performance Impact replied by itsderek23 @ Wed, 23 Apr 2008 14:59:53 -0000

itsderek23 — Wed, 23 Apr 2008 14:59:53 -0000

Christian,

We built Scout so that it’s impact on performance would be very small. Here’s the basics:

In our tests, the Scout client used btw 5-15 MB of memory when running
The Scout client only runs when it’s executing the plugins (ex: every 30 minutes on the free plan) so it doesn’t use resources when it’s not active.
The impact on the server load wasn’t detectable

The client is extremely light – most of the work is done by the plugins. You could build a plugin that is extremely intensive – one that requires a lot of libraries maybe – and it will certainly use more resources. So in the end, it’s up to you.

Also note that you can use Scout to monitor itself – you can use the server load plugin and monitor the memory usage of the “ruby” process to get a feel.

Scout Performance Impact replied by christian @ Tue, 22 Apr 2008 21:46:29 -0000

christian — Tue, 22 Apr 2008 21:46:29 -0000

I have a basic question about scout that I didn’t find in the help section.

Given a web app on a server that doesn’t use Ruby, what the performance impact of installing not just the Scout Client, but also the Ruby engine as well? Can you give us some numbers so we have a sense of it?

cron interval replied by itsderek23 @ Thu, 03 Apr 2008 02:02:28 -0000

itsderek23 — Thu, 03 Apr 2008 02:02:28 -0000

Virginian,

It needs to be at or above the interval – for example, on the free plan, you can report back to scout at most once every 30 minutes. So, you could run it at 31 minutes, 40 minutes – anything at or above 30 minutes.

cron interval replied by virginian @ Wed, 02 Apr 2008 22:12:36 -0000

virginian — Wed, 02 Apr 2008 22:12:36 -0000

Does the reporting time interval in the crontab need to match the account level ie 30 minute, 10 minutes, or 3 minutes?

WhatIsClientKey? replied by seebq @ Wed, 02 Apr 2008 13:28:07 -0000

seebq — Wed, 02 Apr 2008 13:28:07 -0000

iceskysl -

In order to get a client key, you must have an account! You can technically still use Scout without an an account, but only to run individual plugins, using the -p option. If you want to enable them to automatically run, and actually use the report data (collect it on the server, to view trends, and see how data compares against multiple plugins), then you need an account.

Unfortunately, unless you’ve gotten in on one of the few pre-releases we’ve done, you can’t sign up for an account just yet. But, have no fears, we’re launching soon. Make sure to signup on our invite list. Also for more help and details on how the plugin architecture works, read here: How to Create a Plugin

WhatIsClientKey? replied by iceskysl @ Mon, 31 Mar 2008 03:23:09 -0000

iceskysl — Mon, 31 Mar 2008 03:23:09 -0000

Scout is so Great_{~,and the plugins so cool}_{but what is Client Key? and how can i get one?
thx}

=========================
C:\iceskysl>scout
Scout Installation Wizard

You need the Client Key displayed in the Client Settings
tab. It looks like:

6ecad322-0d17-4cb8-9b2c-a12c4541853f

Enter the Client Key:

trouble running scout through cron replied by seebq @ Tue, 18 Mar 2008 18:54:12 -0000

seebq — Tue, 18 Mar 2008 18:54:12 -0000

If you’re having trouble running Scout through cron, be sure to check our help section here:

http://scoutapp.com/help

Here are some more tips.

Try Running Scout using the verbose, debug mode

Try running scout manually first using:

scout [client-key] -v -l debug

Check your crontab’s path

Check to make sure your crontab’s path includes the path to any program you’re calling (i.e. /usr/local/bin if your mongrel_rails is in /usr/local/bin).

You can set this using the PATH variable.

Tell cron to email you output

Setup your email in the crontab file using MAILTO variable and run the scout client using the verbose debugging mode as mentioned above.

Also, come visit us in the support chat room for more help:

http://scoutapp.campfirenow.com/bc177

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