Deploy OneAgent DaemonSet

Learn how you can set up OneAgent on Kubernetes using the OneAgent DaemonSet. DaemonSet is a feature that makes sure that if a copy of a pod on a node dies, the copy is recreated, and if nodes are added to the cluster, copies of the pod are added as well.
For a clear view of all the deployment strategies, see Kubernetes deployment strategies.

Prerequisites

• Pods must allow egress to your Dynatrace environment or to your Environment ActiveGate in order for metric routing to work properly.
• Locate the ONEAGENT_INSTALLER_SCRIPT_URL. This information is shared during Dynatrace OneAgent installation.

Install DaemonSet

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: dynatrace-oneagent
spec:
  selector:
    matchLabels:
      name: dynatrace-oneagent
  template:
    metadata:
      labels:
        name: dynatrace-oneagent
    spec:
      hostPID: true
      hostIPC: true
      hostNetwork: true
      nodeSelector:
        beta.kubernetes.io/os: linux
      volumes:
      - name: host-root
        hostPath:
          path: /
      containers:
      - name: dynatrace-oneagent
        image: dynatrace/oneagent
        env:
        - name: ONEAGENT_INSTALLER_SCRIPT_URL
          value: your_URL
        - name: ONEAGENT_INSTALLER_SKIP_CERT_CHECK
          value: "false"
        - name: ONEAGENT_INSTALLER_DOWNLOAD_TOKEN
          value: "<API-Token>"
        args:
        - "--set-network-zone=<your.network.zone>"
        volumeMounts:
        - name: host-root
          mountPath: /mnt/root
        securityContext:
          privileged: true

kubectl apply -f dynatrace-oneagent.yml --namespace=kube-system
daemonset "dynatrace-oneagent" created

kubectl get pods --namespace=kube-system
NAME                       READY     STATUS              RESTARTS   AGE
dynatrace-oneagent-abcde   1/1       Running             0          1m

kubectl logs -f dynatrace-oneagent-abcde
09:46:18 Using volume-based storage
09:46:18 Started agent deployment as a Docker container, PID 1234.
09:46:18 Downloading agent to /tmp/Dynatrace-OneAgent-Linux.sh via https://EnvironmentID.live.dynatrace.com/api/v1/deployment/installer/agent/unix/default/latest?Api-Token=***&arch=x86&flavor=default
09:46:21 Download complete
09:46:21 Downloaded version: 1.x
09:46:21 Validating downloaded agent installer
09:46:23 Verification successful
...

Limitations

See Docker limitations for details.

Connect your Kubernetes clusters to Dynatrace

Now that you have OneAgent running on your Kubernetes nodes, you're able to monitor those nodes, and the applications running in Kubernetes. The next step is to connect the Kubernetes API to Dynatrace in order to get native Kubernetes metrics, like request limits, and differences in pods requested vs. running pods.
For further instructions see Connect your Kubernetes clusters to Dynatrace.

Update OneAgent DaemonSet

Whenever a new version of OneAgent becomes available in Dynatrace, you can redeploy OneAgent as explained in the steps below. The dynatrace-oneagent container will automatically fetch the latest version of Dynatrace OneAgent.

If you've specified a default OneAgent installation version for new hosts and applications in your OneAgent updates settings, the dynatrace-oneagent container will automatically fetch the defined default version of OneAgent.

kubectl delete ds/dynatrace-oneagent

kubectl apply -f dynatrace-oneagent.yml --namespace=kube-system

Uninstall OneAgent DaemonSet

To uninstall OneAgent DaemonSet from Kubernetes versions 1.8 and earlier

kubectl delete ds/dynatrace-oneagent