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.

Prepare DaemonSet

The first step is locating the ONEAGENT_INSTALLER_SCRIPT_URL. This information is shared during Dynatrace OneAgent installation.

Locate your installer URL

To get your ONEAGENT_INSTALLER_SCRIPT_URL

Select Deploy Dynatrace from the navigation menu, select Start installation, and then Linux.
Determine the installer script URL and token from the UI-provided wget command:

OneAgent container image version 1.39.1000+ OneAgent container image version 1.38.1000 and earlier

This is the URL:
OneAgent URL

This is how to get the ONEAGENT_INSTALLER_DOWNLOAD_TOKEN:
OneAgent token

Replace the value of arch parameter with <arch>. Ignore the flavor=default parameter.

Your URL should look like this: https://host.domain.com/api/v1/deployment/installer/agent/unix/default/latest?arch=<arch>

This is your ONEAGENT_INSTALLER_SCRIPT_URL.

This your URL and API token. OneAgent installation page with URL to be modified

Append the API token to the URL using the API-Token parameter. Your URL should look like this:

https://host.domain.com/api/v1/deployment/installer/agent/unix/default/latest?arch=x86&flavor=default&Api-Token=<token>

This is your ONEAGENT_INSTALLER_SCRIPT_URL.

Install DaemonSet

Download or copy the dynatrace-oneagent.yml Kubernetes template.

dynatrace-oneagent.yml

Download

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: dynatrace-oneagent
spec:
  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: "REPLACE_WITH_YOUR_URL"
        - name: ONEAGENT_INSTALLER_SKIP_CERT_CHECK
          value: "false"
        - name: ONEAGENT_INSTALLER_DOWNLOAD_TOKEN
          value: "<API-Token>"
        args:
        - "--set-app-log-content-access=true"
        volumeMounts:
        - name: host-root
          mountPath: /mnt/root
        securityContext:
          privileged: true

Note: ONEAGENT_INSTALLER_DOWNLOAD_TOKEN is only needed for OneAgent container image versions 1.39+ and is ignored for earlier versions.

Note: The --set-app-log-content-access parameter is passed to the OneAgent installer and, when set to true (or 1), allows OneAgent to access log files for the purpose of log monitoring. For more about this and other parameters, see Customize OneAgent installation on Linux.

Deploy Dynatrace OneAgent using the created file dynatrace-oneagent.yml.

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

Verify that the dynatrace-oneagent DaemonSet has deployed pods to the cluster nodes successfully:

$ 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 Monitor your Kubernetes clusters with Dynatrace.