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Amazon CloudWatch

imgproxy can send its metrics to Amazon CloudWatch. To use this feature, do the following:

  1. Set the IMGPROXY_CLOUD_WATCH_SERVICE_NAME environment variable. imgproxy will use the value of this variable as a value for the ServiceName dimension.
  2. Set up the necessary credentials to grant access to CloudWatch.
  3. (optional) Specify the AWS region with IMGPROXY_CLOUD_WATCH_REGION or AWS_REGION. Default: us-west-1
  4. (optional) Set the IMGPROXY_CLOUD_WATCH_NAMESPACE environment variable to be the desired CloudWatch namespace. Default: imgproxy

imgproxy sends the following metrics to CloudWatch:

  • RequestsInProgress: the number of requests currently in progress
  • ImagesInProgress: the number of images currently in progress
  • WorkersUtilization, ConcurrencyUtilization: the percentage of imgproxy's workers utilization. Calculated as RequestsInProgress / IMGPROXY_WORKERS * 100
  • BufferSize: a summary of the download buffers sizes (in bytes)
  • BufferDefaultSize: calibrated default buffer size (in bytes)
  • BufferMaxSize: calibrated maximum buffer size (in bytes)
  • VipsMemory: libvips memory usage (in bytes)
  • VipsMaxMemory: libvips maximum memory usage (in bytes)
  • VipsAllocs: the number of active vips allocations

Set up credentials​

There are three ways to specify your AWS credentials. The credentials need to have rights to write metrics to CloudWatch:

IAM Roles​

If you're running imgproxy on an Amazon Web Services platform, you can use IAM roles to to get the security credentials to make calls to AWS CloudWatch.

Environment variables​

You can specify an AWS Access Key ID and a Secret Access Key by setting the standard AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.

AWS_ACCESS_KEY_ID=my_access_key AWS_SECRET_ACCESS_KEY=my_secret_key imgproxy

# same for Docker
docker run -e AWS_ACCESS_KEY_ID=my_access_key -e AWS_SECRET_ACCESS_KEY=my_secret_key -it darthsim/imgproxy

Shared credentials file​

Alternatively, you can create the .aws/credentials file in your home directory with the following content:

[default]
aws_access_key_id = %access_key_id
aws_secret_access_key = %secret_access_key