I have an application that after it finishes doing it's work schedules itself to run again after x minutes using CeRunAppAtTime.
It has come to our attention that if users are also manually running the application then we can end up with the application being scheduled to run at several times in the future.
Is it possible to get a list of applications that are scheduled to run and remove them?
I have tried searching for this but have not had any success but I'm not sure of what I should be searching for.
Don't use CeRunAppAtTime - it can't do what you want. Instead use CeSetUserNotificationEx, which you can then query using the CeGetUSerNotificationHandles and CeGetUserNotification APIs
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I would like to run a batch application (that is a short lived process that should not be restarted) on Pivotal CloudFoundry.
I am not sure how to do that. My current batch app is restarted repeatedly by Pivotal CF.
It seems there's a new CF primitive called a task - as opposed to a long-running process. Tasks are supposed to be available on CF 1.7 (see https://stackoverflow.com/a/35512113/536299).
I was neither able to find relevant information in the CF documentation nor to figure out which version of the Pivotal CF is currently being run...
Can someone please help?
I just got relevant information regarding short-lived/one-off processes on CF. It currently seems to be very difficult to run short-lived/one-off processes on CF.
This will change when CF v3's tasks becomes generally available.
Here is the information I was given:
Batch jobs are a little tricky on PWS and PCF because at the moment
the platform expects your application to continue running forever.
Even if the app exits successfully, the platform considers it to have
crashed and will restart it. There is support in v3 of the platform
for one-off tasks like batch jobs, so this will get easier in the
future. For now, what you need to do is to make the app run forever.
One option is to add a loop to the main method in the app, the loop
would essentially run the batch job, pause for some set amount of time
and repeat indefinitely.
So bottom-line is wait for CF v3's tasks.
See here for documentation about tasks: http://v3-apidocs.cloudfoundry.org/version/release-candidate/index.html#tasks
Here's the situation:
I have a Laravel 4.2 application that retrieves (from a third party API) an asset. This is a long-lived asset (it only changes once every 12-24 hours) and is kind of time consuming (a large image file). I do cache the asset, so the impact has been more or less minimized, but there's still the case where the first person who logs in to my application in the morning has to wait while the application loads the asset for the first time.
I have set up a job which will be queued up and will run every eight hours. This ought to ensure that the asset in the cache is always fresh. It works by re-enqueueing the job for eight hours later after it runs.
The problem is this: I'm about to deploy this job system to production & I'm not sure how to start this thing running for the first time.
Ideally, I'd like to have an administration option where I have a button which says "Click here to submit the job", but I'd like to make it as foolproof as possible & prevent people (I'm not the only administrator) from submitting the job multiple times. To do this, however, the application would need to check & see if the job is already in the queue. I can't find a way to do that in an implementation-independent way (I'm using redis, but that may change in the future).
Another option would be to add an artisan command to run the initial process. That way I could deploy the application, run an artisan command, and forget about it.
So, to recap, I have two questions:
Is there a way to check a queue to see what jobs are in there?
Is there a better way to do this?
Thanks
When a job is in laravel queue, it will be saved in jobs table, so you can check by DB.
If it's guaranteed to be the only thing ever in the queue, you could use something like:
if (Queue::size() === 0) {
Queue::push(...);
}
You would need to run the php artisanqueue:listen in the terminal.
Here is the complete documentation if you want to learn more about:
https://laravel.com/docs/5.2/queues#running-the-queue-listener
You can use the Laravel Telescope package.
Laravel Telescope is an elegant debug assistant for the Laravel framework. Telescope provides insight into the requests coming into your application, exceptions, log entries, database queries, queued jobs, mail, notifications, cache operations, scheduled tasks, variable dumps and more. Telescope makes a wonderful companion to your local Laravel development environment.
(Source: https://laravel.com/docs/7.x/telescope)
I have a django application in heroku and one thing I need to do sometimes that take a little bit of time is sending emails.
This is a typical use case of using workers. Heroku offers support for workers, but I have to leave them running all the time (or start and stop them manually), which is annoying.
I would like to use a one-off process to send every email. One possibility I first thought of was using IronWorker, since I thought that I could simply add the job to ironworker's queue and it would be exectuted with a mex of 15 min delay, which is ok for me.
The problem is that with ironworker, I need to put in a zip file all the modules and their dependencies in order to run the job, so in my email use case, as I use "EmailMultiAlternatives" from "django.core.mail.message", I would need to include all the django framework in my zip file in order to be able to use it.
According to this link, it's possible to add/remove workers from the app. Is it possible to start one-off processes from the app?
Does anyone has a better solution?
Thanks in advance
I am wondering if there is a way to monitor these automatically. Right now, in our production/QA/Dev environments - we have bunch of services running that are critical to the application. We also have automatic ETLs running on windows task scheduler at a set time of the day. Currently, I have to log into each server and see if all the services are running fine or not, or check event logs for any errors, or check task scheduler to see if ETLs ran well etc etc... I have to do all the manually... I am wondering if there is a tool out there that will do the monitoring for me and send emails only in case something needs attention (like ETLs fail to run, or service get stopped for whatever reason or errors in event log etc). Thanks for the help.
Paessler PRTG Network Monitor can do all that. we have very good experience with it.
http://www.paessler.com/prtg/features
Nagios is the best tool for monitoring. It checks for the server status as well the defined services in it and if any service goes down or system goes down, sends the mail to specified mail id.
Refer the : http://nagios.org/
Thanks for the above information. I looked at the above options but they have a price.. what I did is an inexpensive way to address my concerns..
For my windows task scheduler jobs that run every night - I installed this tool/service from codeplex that is working great.
http://motash.codeplex.com/documentation#CommentsAnchor
For Windows services - I am just setting the "Recovery" Tab in each service "property" with actions to do when it fails. (like restart, reboot, or run a program which could be an email that will notify)
I built a simple tool (https://cronitor.io) for monitoring periodic/scheduled tasks. The name is a play on "cron" from the unix world, but it is system/task agnostic. All you have to do is make an http request to a unique tracking URL whenever your job runs. If your job doesn't check-in according to the rules you define then it will send you an email/sms message.
It also allows you to track the duration of your jobs by making calls at the beginning and end of your task. This can be really useful for long running jobs since you can be alerted if they start taking too long to run. For example, I once had a backup task that was scheduled every hour. About six months after I set it up it started taking longer than an hour to run!
There is https://eyewitness.io - which is for monitoring server cron tasks, queues and websites. It makes sure each of your cron jobs run when they are supposed to, and alerts you if they failed to be run.
A consultant setup a windows service to run a application. The application is supposed to run every 15 minutes. The application is not running at all and the service appears to be running fine.
I am not familiar with how an application will run at a standard interval when running as a service.
The service uses the SRVANY.EXE tool.
Any 'consultant' that sets up a service to run using SRVANY.EXE should be fired. SRVANY is an unfortunate hack that should have been retired a decade ago; it should never be used in a production environment.
If the only purpose for the service is to run the app on a schedule then it shouldn't exist at all. Run the app as a Scheduled Task. If it has other functionality then rewrite it as a real service. If it is reasonably well written it should be a fairly easy conversion.
There are many potential issues with your application.
SRVANY.EXE turns any application into a Windows Service. If that application ever asks for user input, it will hang. You will want to confirm that the application running as a service does nothing more than start the other application.
You should also be able to run the "starter" application manually, outside the Windows Service. If it still doesn't work as it should you know it's not related to being run as a service.
To add to the other answers: see KB137890 on what SRVANY.EXE actually does and how to find out what application it is running.
It seems to me that you would be better off (if you can) setting up a scheduled task that runs every the application every 15 minutes if you can.
I'm not sure if this is correct, but I believe one way of a serivce running an application is merely to have a thread within OnStart and set it to run the application on an invertal of 15 minutes.