#Celery CloudWatch

Monitor your celery application from within AWS CloudWatch!

##Metrics

The following events are tallied per task:

• CeleryEventSent
• CeleryEventStarted
• CeleryEventSucceeded
• CeleryEventFailed

You can then see how many tasks/day, tasks/week etc are being completed.

Also, we record the total waiting/running per task:

• CeleryNumWaiting
• CeleryNumRunning

Also, statistics on task duration are sent in the metrics:

• CeleryWaitingTime
• CeleryProcessingTime

These metrics are sent with all supported stats (No. Events, Sum, Max, Min), allowing you to gain insight into your task processing and match requests and capacity.

#Getting Started

1. Set up an IAM Role for your instance.

   It must include a policy to perform 'PutMetricData', eg:

   {
     "Version": "2000-01-01",
     "Statement": [
       {
         "Effect": "Allow",
         "Action": [
           "cloudwatch:PutMetricData"
         ],
         "Resource": [
           "*"
         ]
       }
     ]
   }
   

   (Note: Alternatively, you can set up a User with the same policy and provide access details that way)

2. Install via python-pip (and upgrade pip & boto)

   sudo apt-get install -y python-pip
   sudo pip install --upgrade pip boto
   
   # Install directly
   sudo pip install celery-cloudwatch
   
   # OR, install in a virtualenv
   sudo apt-get install -y python-virtualenv
   mkdir /var/python-envs
   virtualenv /var/python-envs/ccwatch
   source /var/python-envs/ccwatch/bin/activate
   pip install celery-cloudwatch

3. Create your own boto.cfg at /etc/boto.cfg-

   [Credentials]
   # if not using an IAM Role - provide aws key/secret
   aws_access_key_id = xxx
   aws_secret_access_key = yyy
   
   [Boto]
   cloudwatch_region_name = my-region
   cloudwatch_region_endpoint = monitoring.my-region.amazonaws.com
   
   

4. Create your own config file in /etc/ccwatch.yaml

   ccwatch:
     broker: null
     camera: celery_cloudwatch.CloudWatchCamera
     verbose: no
   camera:
     frequency: 60.0
     verbose: no
   cloudwatch-camera:
     dryrun: no
     namespace: celery
     tasks:
       - myapp.mytasks.taskname
       - myapp.mytasks.anothertask
       - myapp.mytasks.thirdtask
       - name: myapp.secondarytasks
         dimensions:
           task: myapp.secondarytasks
           customDim: value
       - name: myapp.tertiarytasks
         dimensions:
           task: myapp.tertiarytasks
           customDim: value
   
   

5. Install upstart

   Create a file /etc/init/celery-cloudwatch.conf-

   description "Celery CloudWatch"
   author "nathan muir <ndmuir@gmail.com>"
   
   setuid nobody
   setgid nogroup
   
   start on runlevel [234]
   stop on runlevel [0156]
   
   exec /var/python-envs/ccwatch/bin/ccwatch
   respawn
   

   then-

   sudo initctl reload-configuration
   sudo service celery-cloudwatch start

6. Start Celery your celery workers with the -E (or CELERY_SEND_EVENTS=1 and CELERY_TRACK_STARTED=1) options, and, start celery clients with CELERY_SEND_TASK_SENT_EVENT=1

7. All done! head over to your CloudWatch monitoring page to see the results!