aws-app-mesh-cloudwatch-agent

AWS Cloud Watch Agent optimized for App Mesh usage.

This is a custom Cloud Watch agent built using the steps under https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/ContainerInsights-build-docker-image.html to support using in App Mesh context. Cloud Watch agent is installed as a sidecar to application, for e.g. ECS Task, Kubernetes Pod, daemon on EC2 instance.

In App Mesh, all traffic is intercepted by Envoy unless the sidecar process is running using a specific UID (default=1337). Containers running using non-root user cannot create files unless the image is built with that user created and appropriate permissions. This project provides a Dockerfile that can be used to build a Cloud Watch agent Docker image that runs as non-root user.

Build Docker Image

Clone this repository.

Set following environment variables

$ export AWS_ACCOUNT=...
$ export AWS_REGION=...

Build image
```
$ make image
```

Push image

$ aws ecr create-repository --repository-name amazon/aws-app-mesh-cloudwatch-agent
$ make push

Usage

ECS

Update your task-definition to include cloudwatch-agent as sidecar that exposes statsd endpoint. With App Mesh Envoy configured with environment variable ENABLE_ENVOY_DOG_STATSD: 1, Envoy will publish stats to Cloud Watch under namespace CW_NAMESPACE via cloudwatch-agent sidecar.

Alternately you can inject CW_CONFIG_CONTENT using SSM parameter as explained here.

- Name: 'cwagent'
  Image: <image generated above>
  Essential: true
  User: '1337'
  Environment:
    - Name: CW_CONFIG_CONTENT
      Value:
        Fn::Sub: "{ \"metrics\": { \"namespace\":\"${CW_NAMESPACE}\", \"metrics_collected\": { \"statsd\": {}}}}"
- Name: envoy
  Image: !Ref EnvoyImage
  Essential: true
  User: '1337'
  HealthCheck:
    Command:
      - 'CMD-SHELL'
      - 'curl -s http://localhost:9901/server_info | grep state | grep -q LIVE'
    Interval: 5
    Timeout: 10
    Retries: 10
  Environment:
    - Name: 'ENABLE_ENVOY_STATS_TAGS'
      Value: '1'
    - Name: 'ENABLE_ENVOY_DOG_STATSD'
      Value: '1'
    - Name: 'APPMESH_VIRTUAL_NODE_NAME'
      Value:
        Fn::Join:
          - ''
          -
            - 'mesh/'
            - <mesh-name>
            - '/virtualNode/'
            - <virtual-node-name>

Kubernetes

Update your pod-spec to include cloudwatch-agent as sidecar that exposes statsd endpoint.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: demo-app # the name of the deployment
spec:
  replicas: 1 # tells deployment to run 1 pods matching the template
  selector:
    matchLabels:
      name: demo-app
  template: # create pods using pod definition in this template
    metadata:
      labels:
        name: demo-app
    spec:
      containers:
        - name: demo-app
          ...
        - name: cloudwatch-agent
          image: <image generated above>
          resources:
            limits:
              cpu:  100m
              memory: 100Mi
            requests:
              cpu: 32m
              memory: 24Mi
          volumeMounts:
            - name: cwagentconfig
              mountPath: /etc/cwagentconfig
      volumes:
        - name: cwagentconfig
          configMap:
            name: cwagentconfig-sidecar
---
# create configmap for cwagent sidecar config
apiVersion: v1
data:
  # Configuration is in Json format. No matter what configure change you make,
  # please keep the Json blob valid.
  cwagentconfig.json: |
    {
      "agent": {
        "omit_hostname": true
      },
      "metrics": {
        "namespace": <cloudwatch namespace>,
        "metrics_collected": {
          "statsd": {}
        }
      }
    }
kind: ConfigMap
metadata:
  name: cwagentconfig-sidecar

For more information see here.

Security disclosures

If you think you’ve found a potential security issue, please do not post it in the Issues. Instead, please follow the instructions here or email AWS security directly.

Contributing

Contributions welcome! Please read our guidelines and Code of Conduct.

License

This library is licensed under the MIT-0 License. See the LICENSE file.

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