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Re: confused on message

From: Martin Pala
Subject: Re: confused on message
Date: Sat, 4 Feb 2012 09:43:04 +0100

When you request some action for the service, monit accepts it and protects the service till the action is complete. Some actions are almost instant (such as monitor/unmonitor), some may take more time … the "stop" waits for the process to stop (may take few seconds), the "start" waits for the process to start, "restart" does stop+start. 

Multiple commands to independent services can be send, but as mentioned above, the action is protected and no new commands for the given service is accepted until the pending action completes.

In your case it seems that you do restart by calling "stop" followed immediately by "start" - it will be better to use the "monit restart <service>" command which will do both stop+start at once.


On Feb 3, 2012, at 9:45 PM, Christopher Johnston wrote:

Okie, we switched our central 'launch' script which essentially takes the list of apps from 'monit summary' stops them (some of them), then does a start on the list that matches the regex.  If 10 sequential commands get sent to monit it will fail to start 1 or 2 of them and I see this error in my logs.  Does monit have issues receiving multiple commands all at once?  Seems like an issue to me that monit can't scale to handle requests like this.  This is a multi-user environment where app owners stop and start their apps at their leisure.

<27> Feb  3 12:41:00.441595 -08:00 dev001 monit[25592]: monit: action failed -- Other action already in progress -- please try again later

On Thu, Feb 2, 2012 at 12:53 PM, Christopher Johnston <address@hidden> wrote:
Ok - I grokked the script that handles the restar.  I think this could be the cause, it is essentially doing a 'stop && start' so the initiating start is producing that message since there is already another action going (to stop the app).  We will modify this to use 'restart' instead.

On Thu, Feb 2, 2012 at 10:55 AM, Christopher Johnston <address@hidden> wrote:
I am a little confused on why I am seeing this.  I have 4 applications on my host (in some cases up to 10) where we need to do a dailly/weekly rolling restart of all the apps on the host.   If I signal  4 monit restart commands to the apps in sequence I will end up in a situation where only 2 or 3 out of the apps come up and monit complains that an action is already in progress (assuming its from the other commands).  Monit can't handle getting signaled 4x to take down apps and restart them?  This creates some issues for us when we are doing a mass code roll out to 100s of applications.  We end up having to go and clean up things manually and the driver behind using monit is to provide an automated framework for managing apps and guaranteeing uptime. 

Is there any way to remedy this?  We are using a very low timeout in monit since we can't risk having apps down for long periods could this have something to do with it?

<27> Feb  2 07:48:43.202228 -08:00 dev001 monit[3263]: monit: action failed -- Other action already in progress -- please try again later

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