Running Filebeat on Kubernetesedit

You can use Filebeat Docker images on Kubernetes to retrieve and ship container logs.

Kubernetes deploy manifestsedit

You deploy Filebeat as a DaemonSet to ensure there’s a running instance on each node of the cluster.

The Docker logs host folder (/var/lib/docker/containers) is mounted on the Filebeat container. Filebeat starts an input for the files and begins harvesting them as soon as they appear in the folder.

Everything is deployed under the kube-system namespace by default. To change the namespace, modify the manifest file.

To download the manifest file, run:

curl -L -O https://raw.githubusercontent.com/elastic/beats/6.5/deploy/kubernetes/filebeat-kubernetes.yaml
Warning

If you are using Kubernetes 1.7 or earlier: Filebeat uses a hostPath volume to persist internal data. It’s located under /var/lib/filebeat-data. The manifest uses folder autocreation (DirectoryOrCreate), which was introduced in Kubernetes 1.8. You need to remove type: DirectoryOrCreate from the manifest and create the host folder yourself.

Settingsedit

By default, Filebeat sends events to an existing Elasticsearch deployment, if present. To specify a different destination, change the following parameters in the manifest file:

- name: ELASTICSEARCH_HOST
  value: elasticsearch
- name: ELASTICSEARCH_PORT
  value: "9200"
- name: ELASTICSEARCH_USERNAME
  value: elastic
- name: ELASTICSEARCH_PASSWORD
  value: changeme
Red Hat OpenShift configurationedit

If you are using Red Hat OpenShift, you need to specify additional settings in the manifest file and enable the container to run as privileged.

  1. Modify the DaemonSet container spec in the manifest file:

      securityContext:
        runAsUser: 0
        privileged: true
  2. Grant the filebeat service account access to the privileged SCC:

    oc adm policy add-scc-to-user privileged system:serviceaccount:kube-system:filebeat

    This command enables the container to be privileged as an administrator for OpenShift.

  3. Override the default node selector for the kube-system namespace (or your custom namespace) to allow for scheduling on any node:

    oc patch namespace kube-system -p \
    '{"metadata": {"annotations": {"openshift.io/node-selector": ""}}}'

    This command sets the node selector for the project to an empty string. If you don’t run this command, the default node selector will skip master nodes.

Deployedit

To deploy Filebeat to Kubernetes, run:

kubectl create -f filebeat-kubernetes.yaml

To check the status, run:

$ kubectl --namespace=kube-system get ds/filebeat

NAME       DESIRED   CURRENT   READY     UP-TO-DATE   AVAILABLE   NODE-SELECTOR   AGE
filebeat   32        32        0         32           0           <none>          1m

Log events should start flowing to Elasticsearch. The events are annotated with metadata added by the Add Kubernetes metadata processor.